Author Question: In a laboratory experiment, a student brings up the rotational speed of a flywheel to 30.0 rpm. She ... (Read 140 times)

oliviahorn72 · **on:** Jul 29, 2018

In a laboratory experiment, a student brings up the rotational speed of a flywheel to 30.0 rpm. She then allows it to slow down on its own, and counts 240 revolutions before the apparatus uniformly comes to a stop.

The moment of inertia of the flywheel is 0.0850 kg m2. What is the magnitude of the retarding torque on the flywheel?
A) 0.0000136 N m
B) 0.0787 N m
C) 0.159 N m
D) 0.000278 N m
E) 0.0425 N m

Question 2

A 2.31-kg rope is stretched between supports that are 10.4 m apart, and has a tension in it of 49.2 N. If one end of the rope is slightly tweaked, how long will it take for the resulting disturbance to reach the other end?

A) 0.720 s B) 0.699 s C) 0.615 s D) 0.664 s