Gear because each spike is a wedge shape that adds a mechanical advatage
Answer:
Work done = (1/2)[(Gmm_e)/(R_e)]
Explanation:
I've attached the explanations below.
Answer:

Explanation:
power through string can be determined as shown in figure

Where
P = 57.3 W
V = 13.87 m/s
H = 567 g/m
we know that


therefore 

