1. Two men, Joel and Jerry, push against a (strongly-anchored) wall. Jerry stops after 10 min, while Joel is able to push for 5.0 min longer. Compare the work they do. a. Both men do positive work, but Joel does 75% more work than Jerry. b. Both men do positive work, but Joel does 50% more work than Jerry. c. Both men do positive work, but Jerry does 50% more work than Joel. d. Both men do positive work, but Joel does 25% more work than Jerry. e. Neither of them does any work
1. Two men, Joel and Jerry, push against a (strongly-anchored) wall. Jerry stops after 10 min, while Joel is able to push
for 5.0 min longer. Compare the work they do.
a. Both men do positive work, but Joel does 75% more work than Jerry.
b. Both men do positive work, but Joel does 50% more work than Jerry.
c. Both men do positive work, but Jerry does 50% more work than Joel.
d. Both men do positive work, but Joel does 25% more work than Jerry.
e. Neither of them does any work.
2. For a satellite in a circular orbit around the earth, the gravitational force from the earth on the satellite causes the
centripetal acceleration. The amount of work done by the gravitational force from the earth on the satellite
A) is zero
B) is greater than zero.
C) is less than zero.
D) would be different if the masses of the earth and satellite were different.
E) can’t be determined without a calculator and some data.
i. Prove your answer by using the formula for work, W: (Hint: Consider just a short segment of the orbit, rather than the full
revolution.)
ii. Prove your answer by talking about the satellite’s kinetic energy, ∆?
*Please write your process as much as possible.
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