Question

1. A 50 kg object can be hung from either a 1.0m, 2.0m, or 3.0m steel cable. Each cable has the same diameter and cross-sectional shape. Which cable stretches by the greatest distance?

A. The 3.0m cable

B. They will all stretch by the same amount.

C. The 1.0m cable

D. The 2.0m cable

2. A 165 N kangaroo is in the back of a pickup truck uniformly accelerating forward at 3.00 m/s². The kangaroo remains at rest with respect to the truck. The coefficient of kinetic friction between the 'roo and the truck is 0.400 and that of static friction is 0.600. What is the force of friction acting on the kangaroo? Give your answer in N.  Enter only the numerical value (i.e. do not include the units!)

Answer 1