Author Question: An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his ... (Read 72 times)

kellyjaisingh · **on:** Jul 27, 2018

An ice skater performs a pirouette (a fast spin) by pulling in his outstretched arms close to his body. What happens to his rotational kinetic energy about the axis of rotation?

A) It changes, but it is impossible to tell which way.
B) It increases.
C) It does not change.
D) It decreases.

Question 2

The Earth's escape velocity is defined to be the

A) minimum orbital speed for the Moon to escape from the Earth's gravity
B) minimum orbital speed for the Earth to escape from the Sun's gravity
C) minimum velocity required for an object to escape the Earth's gravity
D) velocity that objects are pulled toward the Earth's surface by gravity