Author Question: When an object is effectively isolated from external torques, like an ice skater twirling on the tip ... (Read 407 times)

JGIBBSON · **on:** Jul 28, 2018

When an object is effectively isolated from external torques, like an ice skater twirling on the tip of one skate, the angular momentum of the object
a. can be increased by shifting mass out away from the axis of rotation.
b. can be decreased by shifting mass out away from the axis of rotation.
c. can be increased by shifting mass in toward the axis of rotation.
d. can be decreased by shifting mass in toward the axis of rotation.
e. cannot be changed except by friction at the point of contact.

Question 2

If 1.0 m3 of concrete weighs 5 104 N, what is the height of the tallest cylindrical concrete pillar that will not collapse under its own weight? (The compression strength of concrete is 1.7 107 N/m2)