Aspinning ice skater will speed up if he brings his arms close to his body. which of the following statements explains this phenomenon? a. angular momentum is always conserved. b. a centripetal force always points outward. c. circular motion is always uniform. d. centripetal acceleration cannot change.

A. Angular momentum is always conserved.

Explanation:

When ice skater is spinning then during skating the ice skater have no external torque on his body.

So here we can say

net torque on a system is rate of change in angular momentum

so here we will have

so we can say

so if ice skater bring his arm closed then his angular momentum will remains conserved during this motion

b mirrors submit a iisner? e. for which optical devices does d sometimes have a positive value? o a a and b o b. a and c o c. b and d 0 d. b and cb