Thank you all in advance 1- The gravitional force excerted by the sun on the ear

Question

Thank you all in advance

1-
The gravitional force excerted by the sun on the earth hold the earth in an orbit around the sun. Assume the orbit is perfectly cicular. Which describe the work done by this gravitational force during a shor time interval in which the earth moves through a displacement in its oribtial path?

a) negetive

b) zero

c) positive

2-

A rock of a mass dropped to the ground from a height. Second rock with mass 7m is dropped from the same height . When the second rock strikes the ground, which of the following best describe for its kinetick energy?

a) one-seventh as much as the first

b) seven times as the first

c) the same

d) can't determine

3-

a certain harmonic oscillator of a 5 kg mass a spring has a total energy of 15 J. If the amplitude of the motion is 3m, what's the spring constant?

Explanation / Answer

1. a) negetive

2. b) seven times as the first

c. 0.5 kx^2 = 15

K = 2*15/9

K = 30/9

K = 3.334 N/m

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