B. because the heavier an object the stronger the gravitational pull is
Answer: 
Explanation:
Given
CD has a playing time of 
Initial angular speed of CD is 
Final angular speed of DC is 
Angular speed, when rpm is given


Final speed

Using equation of angular motion

Insert the values

Magnitude of angular acceleration is 
Answer:
Kinetic energy
Explanation:
When a pendulum is swinging about its mean position, the total energy is conserved.
At the mean position, the kinetic energy is maximum but the potential energy is zero.
At the extreme position, the potential energy is maximum but the kinetic energy is zero.
W=F*D
83J=F*14
83/14=F
5.92N