Question

iii.
The rate of change of angular momentum of a body equals
a) Its angular acceleration
b) The change in its angular velocity
c) The rotational kinetic energy of the body
d) The net external torque acting on the body​

Answer 1

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The rate of change of angular momentum of a body equals

a) Its angular acceleration

b) The change in its angular velocity

c) The rotational kinetic energy of the body

d) The net external torque acting on the body

Answer 2

Answer:

1. A closed system is involved. Nothing is making an effort to twist the Earth or the high-diver. They are isolated from rotation changing influences (hence the term “closed system”).

2. Something remains unchanged. There appears to be a numerical quantity for measuring rotational motion such that the total amount of that quantity remains constant in a closed system.

3. Something can be transferred back and forth without changing the total amount. A diver rotates faster with arms and legs pulled toward the chest from a fully stretched posture