1. Does it require more work to lift a 10 kg box 5 m off the ground or push it 3

Question

1. Does it require more work to lift a 10 kg box 5 m off the ground or push it 3 m across a carpeted floor that exerts a frictional force of 200 N? Assume g = 10 m/s2.

A. The work is the same in both cases. B. More work to lift the box. C. More work to push the box.


2. The acceleration due to gravity at the surface of a planet is 18 m/s2. If a satellite is in a stable orbit at a distance of 3*r m from the planet%u2019s center, where r is the radius of the planet, what is the speed of the satellite to maintain this stable orbit? A. 2*r m/s B. (18*r)^0.5 m/s C. (2*r)^0.5 m/s D.  (6*r)^0.5 m/s

Is D correct for question number 2?

Explanation / Answer

1)

C)more work to lift the box

2)D)(6*r)^0.5

yes D is the correct answer

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