One day when you come into physics lab you find several plastic hemispheres floating like boats in a tank of fresh water. Each lab group is challenged to determine the heaviest rock that can be placed in the bottom of a plastic boat without sinking it. You get one try. Sinking the boat gets you no points, and the maximum number of points goes to the group that can place the heaviest rock without sinking. You begin by measuring one of the hemispheres, finding that it has a mass of 23 g and a diameter of 8.4 cm . What is the mass of the heaviest rock that, in perfectly still water, won't sink the plastic boat?

Answer:

The charged balloon’s mass will be almost equal to the original mass

Explanation:

When an electrically neutral balloon is rubbed on cloth, it losses some electron and becomes positively charged.

The balloon becomes positively charged by the removal of electrons (electrons from the cloth repels electron in the balloon).

The mass of positively charged balloon, will be equal to the original mass minus the mass of electrons removed.

Since Electrons have negligible mass, the removal of electrons from the neutral balloon will have little effect on the original mass of the balloon.

Therefore, the charged balloon’s mass will be almost equal to the original mass

Answer:

a. The spheres will attract each other.

Explanation:

When two conducting spheres are connected by a conducting wire and a negatively charged rod is brought near it then this will induce opposite (positive) charge at the nearest point on the sphere and by the conservation of charges there will also be equal amount of negative charge on the farthest end of this conducting system this is called induced polarization.

Answer:

156.67 m/s

0.45676 times the speed of sound

Explanation:

Distance from the ground = 23.5 km = 23500 m

Time taken by the blast waves to reach the ground = [tex]2\ minutes\ 30\ seconds=2\times 60+30=150\ s[/tex]

Spedd of the wave would be

[tex]Speed=\dfrac{Distance}{Time}\\\Rightarrow v_b=\dfrac{23500}{150}\\\Rightarrow v-b=156.67\ m/s[/tex]

The velocity of the blast wave is 156.67 m/s

v = Velocity of sound = 343 m/s

[tex]\dfrac{v_b}{v}=\dfrac{156.67}{343}\\\Rightarrow v_b=v\dfrac{156.67}{343}\\\Rightarrow v_b=0.45676v[/tex]

The blast wave is 0.45676 times the speed of sound

The average velocity of the blast wave can be calculated using the distance traveled and time taken, resulting in 156.7 m/s. This velocity is less than half the speed of sound at sea level.

The average velocity of the blast wave can be calculated by dividing the distance traveled by the time taken. The distance is the altitude where the explosion occurred, 23.5 km. Converting 2 minutes 30 seconds to seconds gives a time of 150 seconds.

So, velocity = distance / time = 23.5 km / 150 s = 0.1567 km/s = 156.7 m/s.Comparing this to the speed of sound at sea level, which is 343 m/s, the blast wave's velocity of 156.7 m/s is less than half the speed of sound.

Answer:

c. 4 Pi

Explanation:

The pressure law states that the pressure of a gas is directly proportional to its temperature provided volume and other physical quantities remain constant.

If t is the temperature and p is the pressure of a gas,

p ∝ t

p = kt where k s the constant of proportionality

k = p/t

If t1 and p1 are the initial temperature and pressure respectively and

t2, p2 are the final temperature and pressure

p1/t1 = p2/t2

t1 = 100k, t2 = 400k

p2 = p1 × 400/100

p2 = 4t1

The final pressure of the gas is 4 times the initial pressure.

Answer:

318K

113°F

Explanation:

45°C = 45 + 273K = 318K

45°C = (45 × 9/5) + 32 = 81 + 32 = 113°F

The increase in the separation between the bright fringes in the diffraction pattern formed by diffraction grating occurs when there is increase in the wavelength of the light.

The equation for diffraction grating that relates the wavelength and separation of bright fringes is given as;

[tex]d sin\theta = m \lambda \\\\sin \ \theta = \frac{m \lambda}{d}[/tex]

where;

Thus, we can conclude that the increase in the separation between the bright fringes in the diffraction pattern formed by diffraction grating occurs when there is increase in the wavelength of the light.

Learn more here:https://brainly.com/question/15443536

Increasing the wavelength of the light will increase the separation between the bright fringes in the diffraction pattern. The correct option is Option A. Immersion in water or changing slit separation do not contribute similarly.

To increase the separation between the bright fringes in a diffraction pattern, one effective approach is to increase the wavelength of the light. When the wavelength increases, the angle of diffraction becomes larger for each order of maximum, resulting in greater fringe separation. Therefore, the correct answer is Option A: INCREASE THE WAVELENGTH OF THE LIGHT.

Answer:

a)[tex]p=1.89x10^{-27}kg.m.s^{-1}[/tex]

b)[tex]v=0.565\frac{m}{s}[/tex]

Explanation:

First, we need to obtain the linear momentum of the photons of wavelength 350nm.

We are going to use the following formula:

[tex]\lambda=\frac{h}{p}\\Where:\\\lambda=wavelength\\h=placnk's\_constant\\p=Linear\_momentum[/tex]

So the linear momentum is given by:

[tex]p=\frac{h}{\lambda}\\\\p=\frac{6.626x10^{-34}J.s}{350x10^{-9}m}\\\\p=1.89x10^{-27}kg.m.s^{-1}[/tex]

Having the linear momentum of the photon, we can calculate the speed of the hydrogen molecule to have the same momentum, we can use the classic formula for that:

[tex]p=m.v[/tex]

[tex]where:\\m=mass\\v=speed\\p=linear\_momentum[/tex]

The mass of the hydrogen molecule is given by:

[tex]m=2*(1.0078x10^{-3}\frac{kg}{mol}})x\frac{1}{6.022x10^{23}mol}[/tex]

[tex]3.35x10^{-27}kg[/tex]

What we've done here is to use the molecular weight of the hydrogen, and covert it kilograms, we had to multiply by two because the hydrogen molecule is found in pairs.

so:

[tex]v=\frac{p}{m}\\\\v=\frac{1.89x10^{-27}kg.m.s^{-1}}{3.35x10^{-27}kg}\\\\v=0.565\frac{m}{s}[/tex]

(a) The linear momentum of the photon is 1.89 x 10⁻²⁷ kgm/s.

(b) The speed of hydrogen atom with same momentum is 2,079.35 m/s.

The linear momentum of the photon is calculated as follows;

P = h/λ

P = (6.63 x 10⁻³⁴) / (350 x 10⁻⁹)

P = 1.89 x 10⁻²⁷ kgm/s

p = mv

v = p/m

v = (1.89 x 10⁻²⁷ ) / (9.11 x 10⁻³¹)

v = 2,079.35 m/s

Thus, the speed of hydrogen atom with same momentum is 2,079.35 m/s.

Learn more about linear momentum here: https://brainly.com/question/7538238

Answer:

[tex]1.9\times 10^5\ J[/tex]

[tex]1.8\times 10^{2}\ kcal[/tex]

[tex]1.3\times 10^{2}\ kcal[/tex]

[tex]1.2\times 10^{3}\ W[/tex]

Explanation:

m = Mass of person = 60 kg

g = Acceleration due to gravity = 9.81 m/s²

t = Time taken = 10 min and 49 s

Total height

[tex]h=3.7\times 86\\\Rightarrow h=318.2\ m[/tex]

Potential energy is given by

[tex]U=mgh\\\Rightarrow U=60\times 9.81\times 318.2\\\Rightarrow U=187292.52\ J[/tex]

The gravitational potential energy is [tex]1.9\times 10^5\ J[/tex]

The energy in the climb

[tex]\dfrac{187292.52}{0.25}=749170.08\ J[/tex]

Converting to kcal or Cal

[tex]\dfrac{749170.08}{4184}=179.05594\ kcal[/tex]

The amount of energy used to climb [tex]1.8\times 10^{2}\ kcal[/tex]

Amount gone to heat

[tex]179.05594\times 0.75=134.291955\ kcal[/tex]

The amount burned [tex]1.3\times 10^{2}\ kcal[/tex]

Power is given by

[tex]P=\dfrac{E}{t}\\\Rightarrow P=\dfrac{749170.08}{10\times 60+49}\\\Rightarrow P=1154.34526\ W[/tex]

The power is [tex]1.2\times 10^{3}\ W[/tex]

Answer:

Explanation:

Given

distance [tex]s(t)=13\sin (t)+40[/tex]

at [tex]t=\frac{\pi }{3}[/tex]

[tex]s(\frac{\pi }{3})=13\sin (\frac{\pi }{3})+40[/tex]

[tex]s(\frac{\pi }{3})=13\times \frac{\sqrt{3}}{2}+40[/tex]

at [tex]t=\frac{13\pi}{3}=4\pi+\frac{\pi}{3}[/tex]

[tex]s(4\pi+\frac{\pi}{3})=13\sin (4\pi+\frac{\pi}{3})+40[/tex]

Average velocity is change in position w.r.t time

[tex]v_{avg}=\frac{s(4\pi+\frac{\pi}{3})-s(\frac{\pi }{3})}{4\pi+\frac{\pi}{3}-\frac{\pi }{3}}[/tex]

[tex]v_{avg}=0[/tex]        

This is a complex thermodynamics problem about a steam power plant's ideal reheat Rankine cycle. It requires calculation of pressure at reheat stage, total heat input rate and thermal efficiency by using correct thermodynamic practices. Due to the complexity, expert understanding and use of steam tables is necessary.

This is a thermodynamics problem associated with the ideal reheat Rankine cycle in a steam power plant. Due to the complex nature of the problem, the aid of thermodynamics and steam table reference books is required to solve it.

Under these ideal cycle conditions, calculating assumed pressure drops and using the steam tables, we can estimate the reheat pressure during the cycle. The exact figures would be subject to critical examination and calculation based on precise cycle parameters following real-life engineering practices.

For part (b), the total rate of heat input can be calculated using the mass flow rate and specific enthalpies at different stages of the cycle. The thermal efficiency for part (c) can be obtained by dividing the net work output by the total heat input.

An actual T-s diagram for the Rankine cycle would aid in visualizing the process but cannot be drawn here. Basically, the cycle is plotted with entropy(s) on the x-axis and temperature(T) on the y-axis, showing the expansion, reheat, and condensation stages of the steam.

https://brainly.com/question/31328524

#SPJ3

The Ideal Reheat Rankine Cycle is a model for determining efficiency in steam power plants. The pressure at which reheating takes place is typically assumed to be at the midpoint of the high and low-pressure limits. The total heat rate input in the boiler and thermal efficiency cannot be determined without more detailed specification of the conditions.

This question is related to the concepts of thermodynamics in the field of Mechanical Engineering. The Ideal Reheat Rankine Cycle is a model used to predict the performance of steam turbine systems, and we will use principles from this model to answer your questions.

(a) The pressure at which reheating takes place cannot be definitively stated without more specific information like the temperature at the exit of the high-pressure turbine or the entropy at key points in the cycle. However, it’s commonly assumed in practice to occur at the mid-point of the high and low-pressure limits, which would be 7.5 MPa or 7500 kPa.

(b) The total rate of heat input in the boiler cannot be definitively stated without more specific information such as the specific enthalpies at key points in the cycle.

(c) Thermal efficiency of the cycle also requires further specific information such as the enthalpy or temperature at key points in the cycle to compute.

Moreover, drawing a T-s (Temperature vs Entropy) diagram with respect to the saturation lines would need a graphical interface, so it's not possible to illustrate it here.

https://brainly.com/question/37954477

#SPJ2

Answer:

84%

Explanation:

g = Acceleration due to gravity = 9.81 m/s²

[tex]y_0=1\ m[/tex]

x = 10 m

t = Time taken

[tex]v_0[/tex] = 3.5 m/s (assumed, as it is not given)

[tex]A_0=\pi 1.5^2[/tex]

We have the equation

[tex]y=y_0+ut+\dfrac{1}{2}gt^2\\\Rightarrow 0=y_0-\dfrac{1}{2}gt^2\\\Rightarrow t=\sqrt{\dfrac{2y_0}{g}}\\\Rightarrow t=\sqrt{\dfrac{2\times 1}{9.81}}\\\Rightarrow t=0.45152\ s[/tex]

[tex]x=x_0+vt\\\Rightarrow 10=0+v0.45152\\\Rightarrow v=\dfrac{10}{0.45152}\\\Rightarrow v=22.14741\ m/s[/tex]

From continuity equation we have

[tex]Av=A_0v_0\\\Rightarrow A=\dfrac{A_0v_0}{v}\\\Rightarrow A=\dfrac{\pi 1.5^2\times 3.5}{22.14741}\\\Rightarrow A=1.11706\ cm^2[/tex]

Fraction is given by

[tex]f=\dfrac{A_0-A}{A_0}\times 100\\\Rightarrow f=\dfrac{\pi 1.5^2-1.11706}{\pi 1.5^2}\times 100\\\Rightarrow f=84.196\ \%\approx 84\ \%[/tex]

The fraction is 84%

A fraction of the cross-sectional area of the hose hole that Isabella must cover is 84%.

Given the following data:

Vertical distance = 1.0 meters.

Horizontal distance = 10.0 meters.

Radius = 1.5 cm.

Vertical speed = 3.5 m/s.

The time taken to reach a maximum height is given by this formula:

[tex]H=\frac{1}{2} gt^2\\\\t=\sqrt{\frac{2H}{g} } \\\\t=\sqrt{\frac{2\times 1.0}{9.8} }[/tex]

t = 0.452 seconds.

For the velocity required, we have:

[tex]x=x_o+Vt\\\\10=0+V0.452\\\\V=\frac{10}{0.452}[/tex]

V = 22.12 m/s.

From continuity equation, we have:

[tex]A=\frac{A_0V_0}{V} \\\\A=\frac{\pi r^2V_0}{V}\\\\A=\frac{\pi1.5^2 \times 3.5}{22.12} \\\\A=\frac{24.7433}{22.12}[/tex]

A = 1.118 cm^2.

Now, an expression for the fraction of the cross-sectional area is given by:

[tex]F=\frac{A_0-A}{A_0} \times 100\\\\F=\frac{7.0695-1.118}{7.0695} \times 100\\\\F=\frac{5.9515}{7.0695} \times 100\\\\F=0.8419 \times 100[/tex]

F = 84.19 ≈ 84%.

Read more on speed here: brainly.com/question/10545161

From Doppler effect we have that the frequency observed for the relation between the velocities is equivalent to the frequency observed. That is mathematically,

[tex]F_r = \frac{v}{v+v_s}F_s[/tex]

Here,

Speed of sound in water [tex]v = 1522m/s[/tex]

The Dolphin swims directly away from the observer with a velocity [tex]v_s = 8.5m/s[/tex]

Observed frequency of the clicks produced by the dolphin [tex]F_r = 2770Hz[/tex]

Replacing we have,

[tex]F_r = \frac{v}{v+v_s}F_s[/tex]

[tex]F_s = \frac{v+v_s}{v}[/tex]

[tex]F_s = 2770 (\frac{1522}{1522+8.5})[/tex]

[tex]F_s = 2754.61Hz[/tex]

Therefore the frequency emitted by the dolphin is 2754.61Hz

Answer:

Explanation:

(A)

The string has set of normal modes and the string is oscillating in one of its modes.

The resonant frequencies of a physical object depend on its material, structure and boundary conditions.

The free motion described by the normal modes take place at the fixed frequencies and these frequencies is called resonant frequencies.

Given below are the incorrect options about the wave in the string.

• The wave is travelling in the +x direction

• The wave is travelling in the -x direction

• The wave will satisfy the given boundary conditions for any arbitrary wavelength [tex]\lambda_i[/tex]

• The wave does not satisfy the boundary conditions [tex]y_i(0;t)=0 [/tex]

Here, the string of length L held fixed at both ends, located at x=0 and x=L

The key constraint with normal modes is that there are two spatial boundary conditions,[tex]y(0,1)=0 [/tex]

and [tex]y(L,t)=0[/tex]

.The spring is fixed at its two ends.

The correct options about the wave in the string is

• The wavelength [tex]\lambda_i[/tex]  can have only certain specific values if the boundary conditions are to be satisfied.

(B)

The key factors producing the normal mode is that there are two spatial boundary conditions, [tex]y_i(0;t)=0[/tex] and [tex]y_i(L;t)=0[/tex], that are satisfied only for particular value of [tex]\lambda_i[/tex]  .

Given below are the incorrect options about the wave in the string.

•  [tex]A_i[/tex] must be chosen so that the wave fits exactly o the string.

• Any one of  [tex]A_i[/tex] or [tex]\lambda_i[/tex]  or [tex]f_i[/tex]  can be chosen to make the solution a normal mode.

Hence, the correct option is that the system can resonate at only certain resonance frequencies [tex]f_i[/tex] and the wavelength [tex]\lambda_i[/tex]  must be such that [tex]y_i(0;t) = y_i(L;t)=0 [/tex]

(C)

Expression for the wavelength of the various normal modes for a string is,

[tex]\lambda_n=\frac{2L}{n}[/tex] (1)

When [tex]n=1[/tex] , this is the longest wavelength mode.

Substitute 1 for n in equation (1).

[tex]\lambda_n=\frac{2L}{1}\\\\2L[/tex]

When [tex]n=2[/tex] , this is the second longest wavelength mode.

Substitute 2 for n in equation (1).

[tex]\lambda_n=\frac{2L}{2}\\\\L[/tex]

When [tex]n=3[/tex], this is the third longest wavelength mode.

Substitute 3 for n in equation (1).

[tex]\lambda_n=\frac{2L}{3}[/tex]

Therefore, the three longest wavelengths are [tex]2L[/tex],[tex]L[/tex] and [tex]\frac{2L}{3}[/tex].

(D)

Expression for the frequency of the various normal modes for a string is,

[tex]f_n=\frac{v}{\lambda_n}[/tex]

For the case of frequency of the [tex]i^{th}[/tex] normal mode the above equation becomes.

[tex]f_i=\frac{v}{\lambda_i}[/tex]

Here, [tex]f_i[/tex] is the frequency of the [tex]i^{th}[/tex] normal mode, v is wave speed, and [tex]\lambda_i[/tex] is the wavelength of [tex]i^{th}[/tex] normal mode.

Therefore, the frequency of [tex]i^{th}[/tex] normal mode is  [tex]f_i=\frac{v}{\lambda_i}[/tex]

.

The wave in the string travels in the +x direction and the wavelength lambda_i can have only certain specific values to satisfy the boundary conditions. The system can resonate at certain resonance frequencies and the wavelength must satisfy the boundary conditions. The frequency of each normal mode depends on the wavelength.

For the given system of a string held fixed at both ends, the wave in the string travels in the +x direction. The boundary conditions for the wave to satisfy are that yi(0, t) = 0 and yi(L, t) = 0. Therefore, the wavelength lambda_i can have only certain specific values if the boundary conditions are to be satisfied.

It is not necessary for Ai to fit exactly on the string, so statement (b) is incorrect. However, statement (a) is true - the system can resonate at only certain resonance frequencies fi, and the wavelength lambda_i must be such that yi(0, t) = 0 and yi(L, t) = 0. Any one of Ai or lambda_i or fi can be chosen to make the solution a normal mode, so statement (c) is also true.

The three longest wavelengths that fit on the string and satisfy the boundary conditions are lambda_1 = 2L, lambda_2 = L, and lambda_3 = L/2. These wavelengths have the lowest frequencies.

The frequency fi of the ith normal mode depends on the wavelength lambda_i. The frequency can be calculated using the equation fi = (v/lambda_i) * (1/2), where v is the speed of propagation of waves on the string.

https://brainly.com/question/30364040

#SPJ3

Answer:

[tex]n=2.68\times 10^{15}[/tex]photons/s

Yes,we can treat the light as a continuous electromagnetic wave in this case.

Explanation:

We are given that  

Wavelength of photon=[tex]\lambda=532 nm=532\times 10^{-9}m[/tex]

1nm=[tex]10^{-9} m[/tex]

Power of photon=1mW=[tex]0.0010J/s[/tex]

We have to find the number of photons emit from laser.

In 1 s, photon emit energy=0.0010 J

We know that

[tex]E=nh\nu=nh\times \frac{c}{\lambda}[/tex]

Where c[tex]\c=3\times 10^8 m/s[/tex]

[tex]E=[/tex]Energy of photon

[tex]\lambda[/tex]=Wavelength of light

[tex]h=6.626\times 10^{-34}Js[/tex]

Substitute the values then, we get

[tex]0.0010=n\times 6.626\times 10^{-34}\times \frac{3\times 10^8}{532\times 10^{-9}}[/tex]

[tex]n=\frac{0.0010\times 532\times 10^{-9}}{6.626\times 10^{-34}\times 3\times 10^8}[/tex]

[tex]n=2.68\times 10^{15}[/tex]photons/s

Visible light is EM wave.

Range of wavelength of visible light =400nm- 700 nm

Green color lies in visible region because its wavelength lies in 400nm-700 nm.

Therefore, we can treat the light as a continuous electromagnetic wave in this case.

To solve this problem we will apply the concepts related to balance. Since the force applied is 3 times the weight, and the weight is defined as the multiplication between mass and gravity, we will have that the dynamic equilibrium ratio would be given by the relation,

[tex]\sum F = ma[/tex]

[tex]3mg-mg = ma[/tex]

Rearranging to find a,

[tex]a = 2g[/tex]

Using the linear motion kinematic equations, which express that the final velocity of the body, and in the absence of initial velocity, is equivalent to the product between 2 times the acceleration by the distance traveled, that is

[tex]v^2 = 2as[/tex]

[tex]v^2 = 2(2g)(0.18)[/tex]

[tex]v^2 = 2(2*9.8)(0.18)[/tex]

[tex]v = 2.66m/s[/tex]

Therefore the upward speed is 2.66m/s

Answer:

42.9 cm

Explanation:

given,

speed of sound, v = 340 m/s

Frequency of tuning fork, f = 198 Hz

The length of the shortest air column closed at one end.

this is the case of the standing wave.

L = N λ

N = the number of complete sine waves in the standing wave.

The standing wave in the problem is the first harmonic of a pipe open at one end.

N = 1/4

we know,

v = f λ

340 = 198 x λ

λ = 1.717 m

now,

L = N λ

[tex]L = \dfrac{1}{4}\times 1.717[/tex]

[tex]L = 0.429\ m[/tex]

   L = 42.9 cm

minimum length of the required pipe is 42.9 cm.

did you find the answer?

Explanation:

We know that electron always tends to travel in the direction opposite the direction of electric field ( force in directed opposite to the field on electron).

So, since the field points vertically upward , it force the electron move downward. So, the electron will be accelerated in downward in the right direction.

Answer:

[tex]a=3125000 m/s^2\\a=3.125*10^6 m/s^2[/tex]

Acceleration, in m/s, of such a rock fragment = [tex]3.125*10^6m/s^2[/tex]

Explanation:

According to Newton's Third Equation of motion

[tex]V_f^2-V_i^2=2as[/tex]

Where:

[tex]V_f[/tex] is the final velocity

[tex]V_i[/tex] is the initial velocity

a is the acceleration

s is the distance

In our case:

[tex]V_f=V_{escape}, V_i=0,s=4 m[/tex]

So Equation will become:

[tex]V_{escape}^2-V_i^2=2as\\V_{escape}^2-0=2as\\V_{escape}^2=2as\\a=\frac{V_{escape}^2}{2s}\\a=\frac{(5*10^3m)^2}{2*4}\\a=3125000 m/s^2\\a=3.125*10^6 m/s^2[/tex]

Acceleration, in m/s, of such a rock fragment = [tex]3.125*10^6m/s^2[/tex]

Final answer:

To find the acceleration of a rock fragment blasted from Mars, use the equation for acceleration, considering final velocity, initial velocity, and distance. Given the escape velocity of Mars, the acceleration would be approximately 6250 m/s².

Explanation:

To calculate the acceleration of a rock fragment blasted from Mars, we use the equation for acceleration: a = (v² - u²) / (2s), where v is the final velocity, u is the initial velocity, and s is the distance. Given that the final velocity is the escape velocity of Mars, 5.0 km/s, the initial velocity is 0 km/s (as it starts from rest), and the distance s is 4.0 m, we can compute the acceleration.

Substitute the values into the equation: a = ((5.0 km/s)² - (0 km/s)²) / (2 × 4.0 m) = 6.25 km/s². Converting the units to meters per second squared, we get an acceleration of 6250 m/s² for the rock fragment.

Answer:

Mass of rain collected will be 1875 kg

Explanation:

We have given mass of the train [tex]m_i[/tex] = 7500 kg

Velocity of the car [tex]v_i[/tex] = 25 m/sec

After few minutes velocity of the car = 20 m/sec

From conservation of momentum we know that [tex]m_iv_i=m_fv_f[/tex]

So [tex]7500\times 25=m_f\times 20[/tex]

[tex]m_f=9375kg[/tex]

[tex]m_f[/tex] will be sum of mass of car and mass of rain collected

As mass of car is 7500 kg

So mass of rain collected = 9375 - 7500 = 1875  kg

To solve this problem we will apply the concepts related to the conservation of the Momentum. The initial momentum must be equal to the final momentum. Momentum is described as the product between body mass and its respective velocity. Since there is no movement at the end of the collision, the final momentum will be zero.

Our values are given as

Mass of Cadillac

[tex]m_1 = 1000kg[/tex]

mass of VW

[tex]m_2 = 2000kg[/tex]

Let VW impact with speed v, then for conservation of momentum

[tex]m_1v_1+m_2v_2 = 0 \rightarrow[/tex] the Final speed is zero

Replacing,

[tex]1000kg*5mph+2000kg(-v) = 0[/tex]

[tex]v = \frac{1000kg*5mph}{2000kg}[/tex]

[tex]v = 2.5mph[/tex]

Therefore the speed to bring the cadillac to a halt is 2.5mph

The speed that can impact the Cadillac to bring it to a halt is 2.5 mph.

Velocity of the car can be calculated by the conservation of momentum formula,

[tex]\bold {m_1 v_1 =m_2v_2 = 0}[/tex]    Since the final speed is zero,

where,

[tex]\bold {m_1 - mass\ of\ the\ cadillac = 1000 kg}\\\bold {m_2 - mass\ of\ the\ Volks\ Vagon = 2000 kg}[/tex]

[tex]\bold {v_1}[/tex] - velocity of the Cadillac - 5 mph.

Put the values in the formula

[tex]\bold {1000\ kg \times 5\ mph + 2000 kg (-v) = 0 }\\\\\bold {v = \dfrac {1000\ kg \times 5\ mph}{2000\ kg}}\\\\\bold {v = 2.5\ mph}[/tex]

Therefore, the speed that can impact the Cadillac to bring it to a halt is 2.5 mph.

To know more about Speed,

https://brainly.com/question/23774048

Answer:

final velocity of the objects will be 3 m/sec

Explanation:

We have given there are two identical objects of mass 2 kg

So [tex]m_1=m_2=2kg[/tex]

Initial velocity of object A [tex]v_1=12m/sec[/tex]

Initial velocity of object B [tex]v_2=-6m/sec[/tex]

According to conservation of momentum

[tex]m_1v_1+m_2v_2=(m_1+m_2)v[/tex]

[tex]2\times 12+2\times -6=(2+2)v[/tex]

[tex]4v=24-12[/tex]

[tex]4v=12[/tex]

v = 3 m/sec

So final velocity of the objects will be 3 m/sec

To find the final velocity of mass B after a collision, you can use the principle of conservation of momentum. The formula for conservation of momentum is (mass of A * initial velocity of A) + (mass of B * initial velocity of B) = (mass of A * final velocity of A) + (mass of B * final velocity of B). By substituting the given values and solving for the final velocity of mass B, we can determine its value.

To find the final velocity of mass B after the collision, we can use the principle of conservation of momentum. Since the collision is elastic, the total momentum before the collision is equal to the total momentum after the collision.

Mass A has an initial velocity of 5.0 m/s in the +x-direction and after the collision, moves with a velocity of 3.0 m/s in the -x-direction. Mass B has an initial velocity of 3.0 m/s in the -x-direction.

Let's assume the final velocity of mass B is vB. Using the principle of conservation of momentum, we can set up the equation:

Initial momentum = Final momentum

(mass of A * initial velocity of A) + (mass of B * initial velocity of B) = (mass of A * final velocity of A) + (mass of B * final velocity of B)

Substituting the given values:

(5.0 kg * 5.0 m/s) + (5.0 kg * 3.0 m/s) = (5.0 kg * 3.0 m/s) + (mass of B * vB)

Simplifying the equation:

25.0 m/s + 15.0 m/s = 15.0 m/s + (mass of B * vB)

40.0 m/s = 15.0 m/s + (mass of B * vB)

Subtracting 15.0 m/s from both sides:

25.0 m/s = (mass of B * vB)

Dividing both sides by the mass of B:

vB = 25.0 m/s / mass of B

Therefore, the final velocity of mass B after the collision is 25.0 m/s divided by the mass of B.

Answer:

250 kg/m3

Explanation:

The total volume of the raft is length times width times height

V = lwh = 2 * 3 * 0.5 = 3 m cubed

The volume of the raft that is submerged in water is 1/4 of total volume

3 /4 = 0.75 m cubed

Let water density = 1000 kg/m cubed and g = 10 m/s2

The buoyant force is equal to the weight of water displaced by the raft

F = 0.75 * 1000 * 10 = 7500 N

This force is balanced by the raft weight, so the weight of the raft is also 7500N

Mass of raft is 7500 / g = 7500 / 10 = 750 kg

Raft density is mass divided by volume = 750 / 3 = 250 kg/m3

A) Intensity: [tex]4.8 W/m^2[/tex]

B) Intensity: [tex]2.1 W/m^2[/tex]

C) Total intensity: [tex]13.8 W/m^2[/tex]

D) Distance: [tex]1.38\cdot 10^5 m[/tex]

Explanation:

A)

The relationship between intensity of a sound and power emitted is given by

[tex]I=\frac{P}{A}[/tex]

where

I is the intensity

P is the power

A is the surface area at the distance considered

For the speaker in this problem:

P = 60 W

The distance is r = 1.0 m, so the area to consider is the surface of a sphere with this radius:

[tex]A=4\pi r^2 = 4\pi(1.0)^2=12.6 m^2[/tex]

Therefore, the intensity is

[tex]I=\frac{60}{12.6}=4.8 W/m^2[/tex]

B)

For this problem, we can use the same equation we used before:

[tex]I=\frac{P}{A}[/tex]

where in this case, we have:

P = 60 W is the power of the speaker

r = 1.5 m is the distance considered

Therefore, the area of the spherical surface is

[tex]A=4\pi r^2 = 4\pi(1.5)^2=28.3 m^2[/tex]

And so, the intensity here is

[tex]I=\frac{60}{28.3}=2.1 W/m^2[/tex]

C)

In this problem, we have to consider 4 speakers. In order to find the total intensity, we have to add the intensity of each speakers.

For the two front speakers, we have

[tex]P=60 W[/tex]

r = 1.0 m

So we have already calculated their intensity in part A), and it is

[tex]I_1 = I_2 = 4.8 W/m^2[/tex]

For the two rear speakers, we have

[tex]P=60 W[/tex]

r = 1.5 m

So their intensity has been calculated in part B),

[tex]I_3 = I_4 = 2.1 W/m^2[/tex]

Therefore, the total intensity is

[tex]I=I_1 + I_2 + I_3 + I_4 = 4.8+4.8+2.1+2.1=13.8 W/m^2[/tex]

D)

In this case, we want to find the distance r at which the intensity is

[tex]I=10^{-12} W/m^2[/tex]

Using four speakers with power

P = 0.06 W

Since we have 4 speakers, the intensity due to each speaker at the location considered must be

[tex]I'=\frac{I}{4}=\frac{10^{-12}}{4}=2.5\cdot 10^{-13} W/m^2[/tex]

Using the usual equation, we find the area:

[tex]A=\frac{P}{I'}=\frac{0.06}{2.5\cdot 10^{-13}}=2.4\cdot 10^{11} m^2[/tex]

And so, we can find what is the corresponding distance:

[tex]A=4\pi r^2\\r=\sqrt{\frac{A}{4\pi}}=\sqrt{\frac{2.4\cdot 10^{11}}{4\pi}}=1.38\cdot 10^5 m[/tex]

So, the person must be at 138 km.

Learn more about sound waves:

brainly.com/question/4899681

#LearnwithBrainly

The intensity of sound waves can be computed by using the equation I = P / (4πr²). For the minimum discernible intensity, we employ a rearranged version of the same formula to calculate the distance from the car stereo at the threshold of hearing.

The question is about the calculation of sound intensity produced by a car stereo featuring four speakers, each rated at 60 Watts, at various distances. To calculate the intensity (I) of the sound waves at different distances, we use the equation I = P / (4πr²) where P represents power and r is the distance.

For part D, to find the distance (d) at which sound from the stereo could still be discerned, we rearrange the intensity equation to solve for distance, d = √(P / (4πI)). We substitute P with the sound produced (0.06 W) and I with the minimum discernible intensity (10-12 W/m²). Disclaimer: Since external factors like absorption or diffusion are not taken into account, and the car stereo is not treated as a perfect point source emitter, these values serve as approximation.

https://brainly.com/question/15089336

#SPJ11

Answer:

[tex]0.005734 s^{-1}[/tex] and 20.86 seconds are the values of the rate constant and the half-life for this process respectively..

Explanation:

Expression for rate law for first order kinetics is given by:

[tex]a_o=a\times e^{-kt}[/tex]

where,

k = rate constant  

t = age of sample

[tex]a_o[/tex] = let initial amount of the reactant  

a = amount left after decay process  

We have :

[tex]a_o=x[/tex]

[tex]a=58\%\times x=0.58x[/tex]

t = 95 s

[tex]0.58x=x\times e^{-k\times 95 s}[/tex]

[tex]\k= 0.005734 s^{-1}[/tex]

Half life is given by for first order kinetics::

[tex]t_{1/2}=\frac{0.693}{k}[/tex]

[tex]=\frac{0.693}{0.005734 s^{-1}}=120.86 s[/tex]

[tex]0.005734 s^{-1}[/tex] and 20.86 seconds are the values of the rate constant and the half-life for this process respectively..

To solve this problem we will use the concepts related to angular motion equations. Therefore we will have that the angular acceleration will be equivalent to the change in the angular velocity per unit of time.

Later we will use the relationship between linear velocity, radius and angular velocity to find said angular velocity and use it in the mathematical expression of angular acceleration.

The average angular acceleration

[tex]\alpha = \frac{\omega_f - \omega_0}{t}[/tex]

Here

[tex]\alpha[/tex] = Angular acceleration

[tex]\omega_{f,i} =[/tex] Initial and final angular velocity

There is not initial angular velocity,then

[tex]\alpha = \frac{\omega_f}{t}[/tex]

We know that the relation between the tangential velocity with the angular velocity is given by,

[tex]v = r\omega[/tex]

Here,

r = Radius

[tex]\omega[/tex] = Angular velocity,

Rearranging to find the angular velocity

[tex]\omega = \frac{v}{r}}[/tex]

[tex]\omega = \frac{30}{0.20} \rightarrow[/tex] Remember that the radius is half te diameter.

Now replacing this expression at the first equation we have,

[tex]\alpha = \frac{30}{0.20*6}[/tex]

[tex]\alpha = 25 rad /s^2[/tex]

Therefore teh average angular acceleration of each wheel is [tex]25rad/s^2[/tex]

Final answer:

To find the average angular acceleration of each wheel, calculate it using the provided linear acceleration data and the relationship between linear and angular quantities.

Explanation:

Angular acceleration can be calculated using the formula:
α = Δω / Δt

Given the acceleration of the car from 0 to 30 m/s in 6.0 s, we can find the angular acceleration by first calculating the final and initial angular velocities using the relationship between linear and angular quantities.

Substitute the values into the formula and solve for the average angular acceleration of each wheel.

The correct answer here is Option A, always equal to a right angle.

Keep in mind that the phase difference that exists between the electric field and the magnetic wave is 90 °, this means that the changing electric field and the electromagnetic wave are always perpendicular and will be forming a right angle.

Answer:

(a) the net charge inside the closed surface.

Explanation:

In Gauss' Law, Qencl refers to the net charge inside the Gaussian surface. This surface is usually taken as a symmetric geometric surface, but this is merely for simplicity. Gauss' Law holds for any closed surface. Inside this surface there can be insulators as well as conductors. Regardless of the geometry or the materials inside, Qencl refers to the net charge inside the closed surface. The charge outside the surface is irrelevant for Gauss' Law, therefore all the charge in the physical system is not included in Gauss' Law.

To solve this problem we will apply the concepts related to the Electrostatic Force given by Coulomb's law. This force can be mathematically described as

[tex]F = \frac{kq_1q_2}{d^2}[/tex]

Here

k = Coulomb's Constant

[tex]q_{1,2} =[/tex] Charge of each object

d = Distance

Our values are given as,

[tex]q_1 = 1 \mu C[/tex]

[tex]q_2 = 6 \mu C[/tex]

d = 1 m

[tex]k =  9*10^9 Nm^2/C^2[/tex]

a) The electric force on charge [tex]q_2[/tex] is

[tex]F_{12} = \frac{ (9*10^9 Nm^2/C^2)(1*10^{-6} C)(6*10^{-6} C)}{(1 m)^2}[/tex]

[tex]F_{12} = 54 mN[/tex]

Force is positive i.e. repulsive

b) As the force exerted on [tex]q_2[/tex] will be equal to that act on [tex]q_1[/tex],

[tex]F_{21} = F_{12}[/tex]

[tex]F_{21} = 54 mN[/tex]

Force is positive i.e. repulsive

c) If [tex]q_2 = -6 \mu C[/tex], a negative sign will be introduced into the expression above i.e.

[tex]F_{12} = \frac{(9*10^9 Nm^2/C^2)(1*10^{-6} C)(-6*10^{-6} C)}{(1 m)^{2}}[/tex]

[tex]F_{12} = F_{21} = -54 mN[/tex]

Force is negative i.e. attractive

Answer:

[tex]13.5 rad/s^2[/tex]

Explanation:

39 revolutions = 39 * 2π = 245 rad

Let [tex]\omega_0[/tex] be the initial angular velocity of the wheel before the 10 s interval. We have the following equation of motion for angular velocity

[tex]\omega = \omega_0 + \alpha t[/tex]

where [tex]\omega = 92 rad/s[/tex] is the final angular velocity of the rotating wheel. [tex]\alpha[/tex] is the constant angular acceleration of the wheel, which we are looking for, and t = 10s is the duration time that the wheel rotates

[tex]92 = \omega_0 + 10\alpha[/tex]

[tex]\omega_0 = 92 - 10\alpha[/tex]

We also have the following equation of motion for angles

[tex]\theta = \omega_0t + \alpha t^2/2[/tex]

where [tex]\theta = 245 rad[/tex] is the total angles rotated

we can also substitute [tex]\omega_0 = 92 - 10\alpha[/tex]

[tex]245 = 10(92 - 10\alpha) + \alpha 10^2/2[/tex]

[tex]245 = 920 - 100\alpha + 50\alpha[/tex]

[tex]50\alpha = 675 [/tex]

[tex]\alpha = 675 / 50 = 13.5 rad/s^2[/tex]

The answer provides the speed of the putty just before striking the ceiling and the time it takes for the putty to reach the ceiling. The speed is found to be 5.79 m/s and the time taken is calculated to be 1.5 seconds.

The speed of the putty just before it strikes the ceiling:

Using the equation v^2 = u^2 + 2as, where v is the final velocity, u is the initial velocity, a is acceleration, and s is displacement, the speed is found to be 5.79 m/s.

The time it takes for the putty to reach the ceiling:

By using the equation v = u + at, where t is time, a is acceleration, u is initial velocity, and v is final velocity, the time taken is calculated to be 1.5 seconds.