The speed at which a launcher fires tennis balls is constant but the angle between the launcher and the horizontal can be varied. As an angle is decreased from 45° to 30° the range of the tennis balls? a. increases
b. decreases
c. remains the same
d. can’t be determined

Adiver in midair has an angular velocity of 6.0 rad/s and a moment of inertia of 1.2 kg·m2. he then pulls is arms and legs into a tuck position and his angular velocity increases to 12 rad/s. the net external torque acting on the diver is zero. what is his moment of inertia in the tuck position?

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.

What is the increase in density of a medium due to wave travel?