The free-fall acceleration at the surface of planet 1 is 26 m/s^2 . The radius and the mass of planet 2 are twice those of planet 1.

What is the free-fall acceleration on planet 2? Express your answer using two significant figures. m/s^2.

The wave speed will be 516 m/sec. The wave speed is  the product of the wavelength and the frequency of the wave.

The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point, while the trough is the lowest.

The wavelength is also defined as the distance between two locations in a wave that have the same oscillation phase.

The given data in the problem is;

v is the speed = ?

f is the frequency= 215.0 Hz.

λ is the wavelength of the wave= 2.4 m

The relationship between the wave's wavelength, frequency, and speed is given as;

wavelength = speed of wave / frequency

The speed of the wave is found as;

[tex]\rm \lambda= \frac{v}{f} \\\\ \rm v = \lambda \times f \\\\\ \rm v = 2.4 \times 215 \\\\ v= 516 \ m/sec[/tex]

Hence, the wave speed will be 516 m/sec.

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The empirical formula of the compound containing 83% potassium and 17.0% oxygen is K2O.

To determine the empirical formula of a compound containing 83% potassium and 17.0% oxygen, we need to convert these percentages into moles. Assuming we have 100g of the compound, we can calculate the moles of potassium and oxygen. The molar mass of potassium is 39.10 g/mol and the molar mass of oxygen is 16.00 g/mol.

So, the moles of potassium is 83g / 39.10 g/mol = 2.12 mol and the moles of oxygen is 17g / 16.00 g/mol = 1.06 mol.

Next, we divide the moles of each element by the smallest number of moles to get the simplest whole number ratio. In this case, the ratio is approximately 2 K: 1 O. Therefore, the empirical formula of the compound is K2O.

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A middle - aged star that burns hydrogen are called main sequence stars.

Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores.

Given is a middle-age star that burns hydrogen.

A middle - aged star that burns hydrogen are called main sequence stars. These main sequence stars fuse hydrogen atoms which results in the formation of helium atoms in their cores. More than 90 percent of stars are main sequence stars. Our sun is also a main sequence star.

Therefore, a middle - aged star that burns hydrogen are called main sequence stars.

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Answer:

Inner core

Explanation:

The hottest layer of the sun is its core

The hottest part of the sun in the solar system is the Inner core.

Sun can be regarded as one of the star which is found around Earth.

This sun is part of the components of the solar system , and it consists of different layers such as the inner part which is the hottest as well as the radiative zone.

Therefore, the temperature of the inner core of the sun is approximately 27 million degrees F, which made it hotter than Photosphere as well as Convective zone.

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Answer:

Zero (the ellipse is a circle)

Explanation:

The eccentricity of an ellipse is defined as the ratio between the distance of each focus from the centre of the ellipse (c) and the length of the semimajor axis (a):

[tex]e = \frac{c}{a}[/tex]

For a perfect circle, the focii correspond to the centre of the circle, so

c = 0

which means that for a circle,

e = 0

Therefore, the minimum value of the eccentricity of an ellipse is zero, and it occurs when the ellipse coincides with a circle.

Answer:C) light rays reflect and remain concentrated in a bundle upon leaving the water's surface.

Explanation:

) light rays reflect and remain concentrated in a bundle upon leaving the water's surface.

Answer:

c

Explanation:

Answer:

0.196 m

Explanation:

Given in the question that,

time taken by the dolphin to go back to water = 0.2 sec

To solve the question we will use Newton's Law of motion

here S is distance covered

u is initial speed

a = acceleration due to gravity

t = time taken

Plug value in the equation above

S = 0(0.2) + 0.5(-9.8)(0.2)²

S = 0.5(-9.8)(0.2)²

S = -0.196 m

Negative sign represent direction

(Assuming that dolphin have a vertical straight jump not a projectile motion)

Answer:

Power

Explanation:

By definition, power is the rate of energy transfer from one system to another. It is measured in Watts or Joule per second. Power can also be defined as the rate work is done. It can also be calculated using the formula:

[tex]Power = \dfrac{Work}{Time}[/tex]

Power is the name given to the rate at which energy is transferred, and it's a fundamental concept in physics related to work and heat transfer.

The name given to the rate at which energy is transferred is called power. This concept is central in the field of physics, especially when discussing mechanical or electrical systems where energy transfer can occur at varying rates. For example, when an external force is exerted on an object that causes it to move through a distance, the energy transferred in the process is known as work. The power of a system defines how quickly this work is done or how rapidly energy is transferred into, out of, or within the system.

The rate of heat transfer by emitted radiation can be described by the Stefan-Boltzmann law, which incorporates the surface area, temperature, and the Stefan-Boltzmann constant to calculate power. Common units of energy used in such calculations include the kilocalorie (kcal) and the joule (J).

Answer:

B) A & C

Explanation:

Answer:

c) 10 microns/s

Explanation:

The drift velocity (the velocity of the current) of the electrons in a wire is given by

[tex]v=\frac{I}{nAq}[/tex]

where

I is the current

n is the electron number density (the number of electrons per unit volume)

A is the cross-sectional area of the wire

[tex]q=1.6\cdot 10^{-19} C[/tex] is the charge of one electron

Taking a current of

I = 1 A

in a wire of radius r = 1 mm (0.001 m), so with cross-sectional area

[tex]A=\pi r^2 = \pi (0.001 m)^2=3.14\cdot 10^{-6} m^2[/tex]

made of copper, whose electron density number is around

[tex]n=8.5\cdot 10^{28} m^{-3}[/tex]

we find

[tex]v=\frac{1 A}{(8.5\cdot 10^{28} m^{-3})(3.14\cdot 10^{-6} m^2)(1.6\cdot 10^{-19} C)}=2.34\cdot 10^{-5} m/s[/tex]

which means that the closest estimate is

c) 10 microns/s

the answer is b. space = time * velocity

The distance travelled by the car will be 400 m. Option B is correct.

Distance is a numerical representation of the distance between two objects or locations.

Distance can refer to a physical length or an estimate based on other factors in physics or common use. |AB| is a symbol for the distance between two points A and B.

Given data;

Speed (V)= 10 m/s.

Time (t)=40 s

The distance travelled by the car will be;

Distance = speed × time

Distance =10 m/s × 40 s

Distance =400 m

The distance travelled by the car will be 400 m.

Hence,option B is correct.

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Has two unlike poles

2

Take for example the Earth, which has two magnetic poles: one in the north and one in the south.

Answer:

B. $4,000

Explanation:

The formula for the simple interest is

[tex]interest = P\cdot r \cdot t[/tex]

where

P is the principal

r is the interest rate

t is the number of years

In this problem,

P = 20,000 $

r = 0.05

t = 4 years

So the interest is

[tex]P=(20,000 $)(0.05 )(4)=4,000 $[/tex]

Answer:

they all have the gravity.

Answer:

I believe they all have solid rocky surfaces. Hope this helps and good luck!

Explanation:

Mercury.

On the side that is facing sun it's extremely hot.

On the other side it's extremely cold.

Hope this helps.

r3t40

(a) 2.42 J

The kinetic energy of a rotating object is given by:

[tex]K=\frac{1}{2}I \omega^2[/tex]

where

I is the moment of inertia

[tex]\omega[/tex] is the angular speed

Here we have

[tex]\omega=5.88 rad/s[/tex] at the lowest point of the trajectory

While the moment of inertia of a rod rotating around one end is

[tex]I=\frac{1}{3}ML^2 = \frac{1}{3}(0.250 kg)(1.3 m)^2=0.14 kg m^2[/tex]

And substituting in the previous formula, we find the kinetic energy at the lowest position:

[tex]K=\frac{1}{2}(0.14 kg m^2)(5.88 rad/s)^2=2.42 J[/tex]

(b) 0.99 m

According to the law of conservation of energy, the total mechanical energy (sum of kinetic energy and potential energy) must be conserved:

[tex]E=K+U[/tex]

At the lowest point, we can take the potential energy as zero, so the mechanical energy is just kinetic energy:

[tex]E=K=2.42 J[/tex]

At the highest point in the trajectory, the rod is stationary, so the kinetic energy will be zero, and the mechanical energy will simply be equal to the gravitational potential energy:

[tex]E=2.42 J = U = mgh[/tex]

where h is the heigth of the centre of mass of the rod with respect to the lowest point of the trajectory. Solving for h, we find

[tex]h=\frac{E}{mg}=\frac{2.42 J}{(0.250 kg)(9.81 m/s^2)}=0.99 m[/tex]

Answer: C - 60km !!!

Explanation:

Answer:

Balanced Forces

Explanation:

Balanced forces do not cause a change in the motion of objects. Forces that cause a change in motion of objects are called unbalanced forces. Unbalanced forces can change the motion of an object in two ways.

Forces that are equal in size but opposite in direction are called balanced forces. Balanced forces do not cause a change in the motion of objects. Forces that cause a change in motion of objects are called unbalanced forces. Unbalanced forces can change the motion of an object in two ways.

A large elliptical galaxy. Hope this helped

Final answer:

A collision between two spiral galaxies generally results in the creation of a single elliptical galaxy, involving gravitational interactions and often triggering new star formation. Through observations and simulations, we see this process unfold over very long time scales.

Explanation:

A collision between two large spiral galaxies is likely to result in the formation of a single, more massive elliptical galaxy. During such a collision, which is more accurately described as a 'merger', the gravitational forces between the stars and dark matter in each galaxy cause them to interact. While individual stars do not physically collide due to vast interstellar distances, the gas components of the galaxies can collide and trigger bursts of new star formation. This process can also give rise to phenomena such as starburst galaxies and active galactic nuclei (AGN), which can have a significant impact on the evolution of galaxies.

Galactic collisions are intricate, slow-moving interactions happening over timescales of hundreds of millions to a billion years. Through Hubble Space Telescope observations and computer simulations, we have been able to witness these awe-inspiring events, which provide insight into how galaxies evolve. For example, in a computer simulation of a collision between two spiral galaxies, one can see the transformation unfolding where two separate spirals gradually merge to form a single elliptical galaxy, marked by extensive star formation.

Answer:

Making a Hypothesis

Explanation:

-Research the subject of your question. Review the literature and find out as much as you can about previous information and discoveries surrounding your question.

-Develop an educated guess that answers your initial question. This is your hypothesis. Make a prediction based on your hypothesis and state it as a cause-effect relationship.

Mechanical energy remains constant (conserved) if only conservative forces act on the particles.

In this sense, the following forces are conservative:

-Gravitational

-Elastic

-Electrostatics

While the Friction Force and the Magnetic Force are not.

According to this, mechanical energy is conserved in the presence of electrostatic and gravitational forces. Therefore the correct options are A and D.

Answer:

A- electrostatic

C- magnetic

D- gravitational

Explanation:

As per mechanical energy conservation law we can say that when all conservative forces are present on the system then mechanical energy is always conserved

So here we have to choose all such options which will give conservative forces only

so correct answers are

A- electrostatic

C- magnetic

D- gravitational

Answer:

A. sara is correct. IMA = length/height

Explanation:

Answer:

The longer the ramp, the greater the AMA.

Explanation:

When you are creating devices, mechanical devices like ramps to make a job easier for the human being, you want to create them as efficient and with the most upside possible, in that case when building a ramp the longer the ramp the easier it is to push something upwards on it, because the weight of the object is less taken into consideration as the angle of the ramp becomes smaller.

Answer:

The pressure increases by a factor 8

Explanation:

For a gas held at constant temperature, Boyle's law can be applied. It states that the product of the gas pressure and the gas volume is constant, so we can write:

[tex]p_1 V_1 = p_2 V_2[/tex]

where

[tex]p_1[/tex] is the initial pressure

[tex]p_2[/tex] is the final pressure

[tex]V_1[/tex] is the initial volume

[tex]V_2[/tex] is the final volume

For the gas in this problem, the volume is reduced from

[tex]V_1 = 4 L[/tex]

to

[tex]V_2 = 0.5 L[/tex]

so we can rewrite the equation as

[tex]\frac{p_2}{p_1}=\frac{V_1}{V_2}=\frac{4 L}{0.5 L}=8[/tex]

this means that the pressure of the gas will increase by a factor 8.

Answer:

a. 10.0 mL x (7.87 g / 1 mL)

Explanation:

Mass is density times volume.  Therefore:

m = 10.0 mL x (7.87 g / 1 mL)

Answer:

A. 40 cm

Explanation:

For a curved mirror, the focal length is twice the radius of curvature of the mirror. In formula:

[tex]f=2R[/tex]

where

f is the focal length

R is the radius of curvature

The concave mirror in this problem has a radius of curvature of

R = 20 cm

so, its focal length is

[tex]f=2R=2(20 cm)=40 cm[/tex]

Answer:

[tex]159.2 kg/m^3[/tex]

Explanation:

The mass of the liquid is

m = 1.0 kg

The volume of the cylindrical tank is given by

[tex]V=\pi r^2 h[/tex]

where

r = 0.10 m is the radius

h = 0.20 m is the heigth

Substituting,

[tex]V=\pi (0.10 m)^2 (0.20 m)=6.28\cdot 10^{-3}m^3[/tex]

So now we can find the density of the liquid:

[tex]\rho = \frac{m}{V}=\frac{1.0 kg}{6.28\cdot 10^{-3} m^3}=159.2 kg/m^3[/tex]

Answer:

4A

Explanation:

Current is charge per time.  So if the second wire delivers twice as much charge in the same amount of time, it must have twice the current.

2 × 2A = 4A

The current in the second wire that delivers twice as much charge in the same amount of time is 4 amperes (4A).

Current is defined as the rate of flow of electric charge, so if the first wire carries a 2A current, it delivers 2 coulombs of charge per second (1 A = 1 C/s).

To deliver twice as much charge in the same time, the second wire must deliver 4 coulombs of charge per second.

Therefore, its current is 4 amperes (4A) because it delivers 4C of charge per second, which is double the charge delivered by the first wire.

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Answer:

The period is proportional to the square root of the length of the wire.

The period is independent of the suspended mass.

Explanation:

The period of a simple pendulum, in the small angle oscillation approximation, is given by

[tex]T=2\pi \sqrt{\frac{L}{g}}[/tex]

where

L is the length of the pendulum

g is the acceleration due to gravity

From the formula, we notice the following facts:

- The period is proportional to the square root of the length of the wire, L

- The period is independent of the suspended mass, m

So, these are the two correct statements.

In a displacement versus time graph, the slope of the line at any point on the graph indicates the magnitude of velocity.  

(It can't indicate velocity completely, because the graph shows nothing about the direction of the motion.)

In a displacement versus time graph, the slope of the line at any point on the graph indicates the magnitude of velocity.  

Velocity is the time rate of change of displacement. The displacement and velocity both are vector quantities. They represent magnitude and direction as well.

velocity = change in displacement / change in time

v = ds/dt

So, the slope of line showing the graph of displacement vs time give s an idea of velocity of the particle.

Thus, the slope of the line at any point on the graph indicates the magnitude of velocity.

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