A child is playing in a park of a rotating cylinder of radius, r, is set in rotation at an angular speed w. the base of the cylinder is slowly moved away, leasing the child suspended against the wall in a vertical position. what is the minimum coefficient of friction between the childs clothing and wall is needed to prevent it from falling?

An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 104 v before it hits the target. what is the kinetic energy of the electron in electron volts?

On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. it strikes a red glider that has mass 0.600 kg and that is initially at rest. after the collision, the blue glider is moving to the left with a speed of 3.00 m/s.(a) what are the magnitude and direction of the velocity of the red glider after the collision? (b) is this collision elastic?

Does the asteroid belt revolve around the sun?