Q1. A 300 g block on a 60 m-long string swings in a circle on a horizontal, frictionless table at 85rpm. What is the velocity and tension?
Q2. When catching a baseball, a catcher's glove moves by 12cm along the line of motion of the ball. If the baseball exerts a force of 477N on the glove, how much work is done by the ball?
Q3. A rock of mass 42kg accidentally breaks loose from an edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 261N. What is the magnitude of an acceleration of the rock?