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When Can We Talk about Potential Energy

A space shutt...

Question

A space shuttle is pulled closer towards the earth by earth's gravity. In this case the work done by the internal forces of earth - shuttle system is positive.but why don't we consider the concept of change in potential energy to find the workdone?

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Solution

We can actually take potential energy into consideration for calculating the work done.
W = mg(force) x h(displacement)

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Q. A space shuttle is pulled closer towards the Earth by the Earth's gravity. In this case the work done by the internal forces of Earth-shuttle system will be?

Q. A space shuttle is pulled closer towards the Earth by the Earth's gravity. In this case, the work done by gravity is .

Q. A space shuttle of mass 86400 kg is revolving in a circular orbit of radius

6.66 \times 10^{6}

m around the earth. It takes 90.1 minutes for the shuttle to complete one revolution. On a repair mission it moves 1 m closer to a disabled satellite every 3.0 s. Find the kinetic energy of shuttle relative to the satellite

105, 000 k g

space shuttle is doing a training exercise in outer space.
How much energy would it take to bump up the space shuttle from an altitude of

500 k m

1000 k m

above the surface of the earth?
Assume the radius of the Earth is

6.37 \times 10^{6} m

and the mass of the Earth is

5.98 \times 10^{24} k g

Q. Suppose a space shuttle is in orbit about the earth at 400 km above its surface. Determine the orbital speed and the orbital period of the Space Shuttle. Use the information given below.

G = 6.673 \times 10^{- 11} N m^{2} / k g^{2}

M_{e a r t h} = 5.98 \times 10^{24} k g

R_{e a r t h} = 6.37 \times 10^{6} m

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When Can We Talk about Potential Energy

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