A mechanic uses a jack to lift up a car. He exerts a force of 11,000 N at a distance of 3m from the axis of rotation. How much torque was put on the car?

Answer:

The energy of a photon is directly proportional to it's frequency

Answer:

B. The energy of the photon is directly proportional to frequency.

Explanation:

Answer:

uekdjdbrjrnkfkdkfkff

Explanation:

E=mc(tetha)

=15(3.4x105)(0)

=0joules

Answer:

Net force = 3640 N

Explanation:

From first equation of motion

V = U + at

4.5 = 22 + 6.75a

( 4.5-22) ÷ 6.75 = a

acceleration (a) = -2.6m/s^2 ( negative sign shows deceleration, but actual acceleration is 2.6)

But Force = mass × acceleration

Force = 1400 × 2.6

Force = 3640 N

Answer:

Work done is 12.3 J

Explanation:

We have,

Mass of puck, m = 0.35 kg

Force of friction acting on the puck when it slides is 0.15 N

Distance travelled by the puck is 82 m.

It is required to find the work done on the puck. Finally the puck comes to rest and the force of friction is acting on it. It means the applied force is 0.15 N. Work done is given by

[tex]W=Fd\\\\W=0.15\times 82\\\\W=12.3\ J[/tex]

The work done on the puck is 12.3 J.

The net rate of energy flow from the tungsten sphere can be calculated using the modified Stefan-Boltzmann equation, taking into account the sphere's emissivity, surface area and temperature, as well as the temperature of the surroundings. After calculating, we have the net rate of heat transfer.

The net flow rate of energy from an object, in this case a tungsten sphere, can be calculated using the modified Stefan-Boltzmann equation which is suitable for net rate of heat transfer by radiation. The formula used is Qnet = σeA(T₁⁴ - T₂⁴), where σ is the Stefan-Boltzmann constant (5.67 × 10⁻⁸ J/s.m².K⁴), e is the emissivity (0.35 for tungsten), A is the surface area of the sphere (πr² with r being the radius of the sphere), and T₁ and T₂ are the temperatures of the sphere and the surroundings respectively, converted to Kelvin.

First, we convert the Celsius temperatures to Kelvin by adding 273.15 to each temperature, making T₁ = 298.15 K and T₂ = 268.15 K. Then, finding the surface area, we get A = 4πr² = 4.90 m² with r = 0.25 m. Substituting these values into the equation gives us Qnet = (5.67 × 10⁻⁸ J/s.m².K⁴)(0.35)(4.90 m²)[(298.15 K)⁴ - (268.15 K)⁴] which, when calculated, gives the net rate of heat transfer by radiation from the tungsten sphere.

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Final answer:

The net flow rate of energy from a tungsten sphere in a cooler room can be calculated using the Stefan-Boltzmann law; accounting for emissivity, surface area, and the difference in the fourth powers of the absolute temperatures of the sphere and its surroundings.

Explanation:

The student's question regarding the net flow rate of energy out of a tungsten sphere enclosed in a room with cooler walls can be answered using the Stefan-Boltzmann law for thermal radiation which states that the power radiated from an object is proportional to its emissivity (e), the Stefan-Boltzmann constant (σ), the surface area of the object (A), and the fourth power of its absolute temperature (T) in kelvins. For our purposes, the net power radiated is the difference in power radiated by the sphere and the power absorbed from the surroundings. To find the surface area (A) of the sphere we use the formula 4πr2 where r is the radius of the sphere. Then, we transform the temperatures from Celsius to Kelvins and plug our values into the equation P = eσA(T4 - T04) to find the net flow rate of energy out of the sphere.

Answer:

25 W

Explanation:

Power: This can be defined as the rate at which work is done. The S.I unit of power is Watt (W).

The expression of power is given as

Power = work output/time

P = W/t................ Equation 1

Given: W = 25 J. t = 1s

Substitute into equation 1

P = 25/1

P = 25 W

Hence the output power of the motor is 25 W

Answer:

The power is 25 W

Explanation:

Given;

work done by motor output. E = 25 J

Time taken to complete this task, t = 1 s

Power is the amount of work done per unit time or energy per unit time.

The amount of power developed by the motor, can be calculated as follows using the formula below;

[tex]Power = \frac{Energy}{time} = \frac{25}{1} = 25 \ W[/tex]

Therefore, the amount of power developed by the motor in the given time is 25 W.

Answer:Mercury, Venus, Earth and Mars.

Explanation: The surfaces of asteroids and the rocky, ice covered moons of the outer gas planets are cratered as well.

Answer:

red light > electron > proton > baseball > person > car

Explanation:

To calculate the wavelength associated to each object, you use the Broglie's relation:

[tex]\lambda=\frac{h}{mv}\\\\[/tex]

h: Planck,s constant = 6.62*10^-34 Js

m: mass

v: velocity

For each object you use an average values of its mass.

person:

mass = 80kg

[tex]\lambda=\frac{6.62*10^{-34}Js}{(80kg)(4.5m/s)}=1.83*10^{-36}m[/tex]

electron:

mass = 9.1*10^{-31}kg

[tex]\lambda=\frac{6.62*10^{-34}Js}{(9.1*10^{-31}kg)(0.01c)}\\\\\lambda=\frac{6.62*10^{-34}Js}{(9.1*10^{-31}kg)(0.01(3*10^{8}m/s))}\\\\\lambda=2.42*10^{-10}m[/tex]

red light:

In this case you use the following formula:

[tex]\lambda=\frac{c}{f}=\frac{3*10^8m/s}{4.3*10^{14}Hz}=6.97*10^{-7}m\approx700nm[/tex]

proton:

mass = 1.67*10^{-27}kg

[tex]\lambda=\frac{6.62*10^{-34}Js}{(1.67*10^{-27}kg)(0.01(3*10^8m/s))}\\\\\lambda=1.32*10^{-13}m[/tex]

car:

mass = 1500kg

[tex]\lambda=\frac{6.62*10^{-34}Js}{(1500kg)(27m/s)}=1.63*10^{-38}m[/tex]

baseball:

mass = 0.145kg

[tex]\lambda=\frac{6.62*10^{-34}Js}{(0.145kg)(41m/s)}\\\\\lambda=1.11*10^{-34}m[/tex]

hence, by comparing the wavelengths of the objects you have:

red light > electron > proton > baseball > person > car

Answer:

Fundamental frequency is 70.12 m

Explanation:

For an open organ pipe, the fundamental frequency is given by :

[tex]f=\dfrac{nv}{2l}[/tex]

n = 1 for fundamental frequency

v is speed of sound in air, v = 345 m/s

l is length of open organ pipe, l = 2.46 m

Substituting values in above formula. So,

[tex]f=\dfrac{1\times 345}{2\times 2.46}\\\\f=70.12\ Hz[/tex]

So, the fundamental frequency of this pipe is 70.12 m.

Final answer:

The fundamental frequency of a 2.46 m long open organ pipe, with air speed 345 m/s, is approximately 70.12 Hz.

Explanation:

To find the fundamental frequency of an open organ pipe, we can use the formula for the fundamental frequency of a pipe that is open at both ends, which is f1 = v / (2*L), where f1 is the fundamental frequency, v is the speed of sound in the pipe, and L is the length of the pipe.

In this case, the organ pipe is 2.46 meters long, and the speed of the air in the pipe is given as 345 meters per second. Plugging these values into the formula, we get:

f1 = 345 m/s / (2 * 2.46 m) = 345 m/s / 4.92 m = 70.12 Hz

Therefore, the fundamental frequency of this 2.46 m long open organ pipe is approximately 70.12 Hz.

Answer:

D

Explanation:

I will use my guess because I can. Unless you're the same person just spamming their question but if not, don't worry about it. they will crash at 5 m/s.

Final answer:

To analyze an elastic collision, one should use the momentum and kinetic energy conservation equations, simplifying them if one object is initially at rest. Inelastic collisions involve the conservation of momentum only and require experimental measures to determine energy dissipation.

Explanation:

An elastic collision is a type of collision where both momentum and kinetic energy are conserved. To solve a problem involving an elastic collision, one must use two independent equations: the conservation of momentum equation and the conservation of kinetic energy equation. If one of the objects is initially at rest, as stated in the question, the equations become simpler. We can set the initial velocity of the second object to zero, and then combine the equations algebraically to solve for the final velocities of both objects.

In the case of an inelastic collision, only momentum is conserved, and some kinetic energy is transformed into other forms of energy, such as heat or sound. To analyze changes in kinetic energy for an inelastic collision, one could modify an experiment to measure velocities before and after the collision and then calculate the kinetic energy to determine the fraction of mechanical energy dissipated.

In summary, analyzing an elastic collision typically involves mathematical calculations of velocities and kinetic energy, while an inelastic collision would be explored through experiments and calculations focusing on energy dissipation. If making graphical representations, one would plot momentum and kinetic energy before and after the collision to verify these relationships.

Answer:

Speed of wave 54 ms⁻¹.

Explanation:

Given data:

Frequency of wave = 60 Hz

Wavelength of wave = 0.90 m

Speed = ?

Solution:

Formula

speed = wavelength × frequency

Now we will put the values in formula.

v = f × λ

Hz =  s⁻¹

v = 60 s⁻¹ × 0.90 m

v = 54 m s⁻¹

A wave with a frequency of 60 Hz and a wavelength of 0.90 m through rubber travels at a speed of 54 m/s.

The speed of a wave can be calculated by the formula: Speed = Frequency * Wavelength. Given that the frequency is 60.0 Hz and the wavelength is 0.90 m, we can substitute these values into the formula. Therefore, the speed of the wave is 60.0 Hz * 0.90 m = 54 m/s. This means that a wave with a frequency of 60 Hz and a wavelength of 0.90 m travels through rubber at a speed of 54 m/s.

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The average speed is 1.54 miles per hour.

As we know that,

              Average speed [tex]=\frac{Distance}{time}[/tex]

Given that Timmy and Sarah travel 5 miles in  three hours and 15 minutes.

Time [tex]=3+\frac{15}{60} =\frac{13}{4}hours[/tex]

    Average speed [tex]=5\div \frac{13}{4} =5*\frac{4}{13}=1.54 miles/hour[/tex]

Thus, The average speed is 1.54 miles per hour.

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Spectrographs help astronomers classify stars by providing a 'fingerprint' of the star. This fingerprint allows astronomers to determine the composition, temperature and other factors of a star.

Spectrographs are critical tools in astronomy because they allow astronomers to analyze and classify stars based on their spectra. When light from a star passes through a spectrograph, it is split into its component colors, creating a spectrum. This spectrum is like a fingerprint for the star because each element leaves a specific pattern of spectral lines in the star's light. In other words, by identifying these lines, astronomers can determine the composition of stars.

In addition to determining a star's composition, the spectrum can also give hints about a star's temperature, velocity relative to Earth, and even information about its size. So, while a spectrograph does not directly measure the size or brightness of stars, the data it provides enables astronomers to infer this information.

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The correct answer is option D. They analyze the composition of stars.

Answer:

The flow of fluid molecules in fluid mechanics is synonymous to the flow of electrons in electricity.

Explanation:

The flow of fluid molecules in fluid mechanics is synonymous to the flow of electrons in electricity. Water, when it is falling by the force of gravity, can be used to turn turbines and generators that produce electricity.

A turbine converts the kinetic energy of falling water into mechanical energy. Then a generator converts the mechanical energy from the turbine into electrical energy. Hydroelectric power plants are the most efficient means of producing electric energy.

Discussing gravity and fluid flows is beneficial when learning about electricity due to the analogies between these phenomena, which aid in understanding the behavior of electric charges and circuits. These comparisons help visualize electrical concepts and deepen comprehension of various electrical phenomena and technologies.

Discussing gravity and fluid flows when learning about electricity is crucial due to the similarities in the concepts governing all these phenomena. For instance, electricity is often taught through the analogy of water flow in pipes, where electric current, voltage, and resistance are likened to the flow rate, pressure difference, and pipe size in fluid dynamics. This analogy helps students visualize and understand how electric charges behave in circuits, just as water flows through a system under the influence of gravity. Moreover, the concept of gravitational potential energy in physics is analogous to electric potential energy in electromagnetism, where masses and charges experience forces due to their respective fields. Understanding these analogies deeply enriches the comprehension of electrical phenomena and leads to insights into the behavior of electricity in various mediums, such as solids, liquids, and gases.

Examples such as lightning, the formation of bluish crust on car battery terminals, and the need for electrolytes in sports drinks can be understood better by studying the flow of charged particles. These particles, like fluid in the presence of a gravitational field, respond to electric fields by moving from areas of high potential to low potential, analogous to water flowing downward due to gravity. This comparison between electric and gravitational fields lays a solid foundation for exploring more complex electrical behaviors and technologies.

Faster to hit the ground because if so yes?

Answer:

Nitrogen

Explanation:

Answer:

(i)The current flow in black wire = 9.67 A (ii) The current low in the red wire is 9.68 A (iii) The current flow in neutral wire is  15.36 A (iv) when 240 volt were disconnected current  in black wire is 7.68 A (v) when 240 volt were disconnected current in red wire is 7.68 A (vi) 15.36 A (vii) 6.34 (viii) 9.68 A (ix) 12.02 A

Explanation:

Solution

The current drawn by one amp is

I =P/V

I =200/120

I= 1.67 A

(i) The current flow in the black wire  is

IBK = 4 * 1.67 A + 1A + 2A

IBK = 9.67 A

(ii) Current flow in the red wire is

IRD = 3 * 1.67 A + 1.67 A + 1A + 2A

= 8.68A + 1 A = 9.68 A

Note: Kindly find an attached copy of part of the solution to the given question above.

Answer:

Boiling point

Explanation:

A liquid turns into a vapor at a certain temperature, known as the boiling point.

The boiling point is the temperature at which a liquid transforms into a gas. It is a fundamental concept in chemistry and is typically related to phase transitions and thermodynamics. In Dalton's experiment, the boiling point of the liquid under study was observed to be 135°C.

The boiling point is the temperature at which a liquid transforms into a gas or vapor. In Dalton's investigation, the boiling point of the liquid he was studying was 135°C. This concept applies when substances are undergoing a phase transition from liquid to gas, which is a core principle of chemistry. During this process, the average kinetic energy of the molecules of the liquid increases, and more molecules have sufficient energy to escape from the liquid into the gas phase.

The observation of a substance changing states due to an increase in temperature, as Dalton has done in his experiment, is crucial to understanding the nature and properties of the substance. The transition of a substance from a liquid to a gas is also an important concept in thermodynamics, with applications in areas such as cooking and the semiconductor industry.

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Answer:

1. Potential energy is converted into kinetic energy since they are in motion.

2. As they slope down, work is done against the dissipative forces e.g; Air resistance, viscosity ( friction ). Hence energy is lost.

3. Different weights and heights at which they started sloping.

[tex]potential \: energy = mgh[/tex]

where mg is the weight.

h is the height moved

therefore, weight and height determines the potential energy.

When skiers descend, their potential energy converts to kinetic energy, which powers their movement. Energy is lost through friction and air resistance, reducing their overall energy. Different skiers can have different potential energy due to their varying mass.

1. As the skiers move down the mountain, their potential energy, which is energy stored due to their elevated position, is converted into kinetic energy. This is the energy of motion that allows them to accelerate and move downhill.

2. In theory, potential energy would convert perfectly to kinetic energy. However, in reality, some energy is lost due to friction between the skis and the snow and through air resistance. These forces cause the skiers to lose speed over time, which means they will not be able to reach their original height when performing tricks.

3. Even though all skiers launch from the same location, their potential energy could vary due to differences in mass. According to the formula for potential energy which is PE = mgh (mass x gravity x height), a skier with a larger mass would have more potential energy than a skier with smaller mass, assuming they are at the same height.

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Answer:

35 N

Explanation:

Force, F = ma where m = mass = 7 kg and a = acceleration = 5 m/s².

So, F = ma = 7 kg × 5 m/s² = 35 N

Final answer:

To find the unknown force applied to an object with a mass of 7 kg accelerating at 5 m/s², use the formula F = ma to calculate it as 35 N.

Explanation:

The unknown force applied to the object with a mass of 7 kg can be calculated using the formula F = ma.

Given mass (m) = 7 kg and acceleration (a) = 5 m/s²

Substitute the values into the formula:  F = (7 kg) (5 m/s²) = 35 N

Therefore, the unknown force applied to the object is 35 Newtons.

Mechanical Energy = PE + KE

PE: mgh = 200 x 9.8 x 18 = 35280

PE: 35280 Joules

KE: 1/2mv^2 = 1/2 x 200 x 16^2 = 25600

KE: 25600 Joules

ME: 35280 + 25600

ME: 60,880J

Answer:

Force, F = 622.28 N

Explanation:

It is given that,

Torque, [tex]\tau=100\ N-m[/tex]

Angle between force and displacement, [tex]\theta=40^{\circ}[/tex]

Distance, d = 25 cm = 0.25 m

We need to find the force required to produce the torque. Torque produced by an object is given by :

[tex]\tau=Fd\sin\theta[/tex]

F is force required to produce torque

[tex]F=\dfrac{\tau}{d\sin\theta}\\\\F=\dfrac{100}{0.25\times \sin(40)}\\\\F=622.28\ N[/tex]

So, applied force is 622.28 N.

Answer:

same as the potential energy possessed at top

= 0.5×9.8×8

= 39.2 joules

Answer: The answer is 40 J.

Explanation: I did it just now.

Answer:

one person exerts more force than the other so that the forces are unbalanced.

Explanation:

Answer:

C.one person exerts more force than the other so that the forces are unbalanced

Explanation:

just took the test

Answer:

"Right Hand

Right Hand Rule: Magnetic fields exert forces on moving charges. This force is one of the most basic known. The direction of the magnetic force on a moving charge is perpendicular to the plane formed by v and B and follows right hand rule–1 (RHR-1) "

Explanation:

Answer:

The direction of the magnetic force acting on a moving electric charge in a magnetic field is perpendicular to the direction of motion. A magnetic force is exerted on an electric charge moving through a uniform magnetic field. An electric charge moving parallel to a magnetic field experiences a magnetic force.

Explanation:

Answer:

ΔV = 150 V

Explanation:

Answer:

it increases too as it bend away from the normal line