Author Question: A rope is lying on a table. You pick up one end and start raising it with a constant velocity. The ... (Read 40 times)

cdr_15 · **on:** Jul 29, 2018

A rope is lying on a table. You pick up one end and start raising it with a constant velocity. The force you have to exert on the rope is

A) equal to the weight of the portion of the rope that is not on the table.
B) greater than the weight of the portion of the rope that is not on the table.
C) less than the weight of the portion of the rope that is not on the table but not zero N.
D) zero N.
E) Cannot be determined without additional information.

Question 2

A puck with a mass m1 = 50.0 g moving at 1.00 m/s approaches a stationary puck with a mass m2 = 100 g on an air table and they undergo a two-dimensional elastic collision.

After the collision, both pucks have identical speeds, but travel in different directions. What is the angle between the original and final paths of m1? A) 30.0
B) 60.0
C) 90.0
D) 120
E) 150