Author Question: An electrical motor spins at a constant 2857.0 rev/min. If the armature radius is 2.685 cm, what is ... (Read 161 times)

mpobi80 · **on:** Jul 29, 2018

An electrical motor spins at a constant 2857.0 rev/min. If the armature radius is 2.685 cm, what is the acceleration of the outer edge of the armature?

A) 2403 m/s2
B) 844.4 m/s2
C) 241,100 m/s2
D) 84.40 m/s2

Question 2

An ice skater doing a spin pulls in her arms, decreasing her moment of inertia by a factor of two. How does her angular speed changes?

A) It is reduced by a factor of two.
B) It is reduced by a factor of four.
C) It increases by a factor of two.
D) It increases by a factor of four.
E) It doesn't change.