The analysis of a simple pendulum assumed that the mass was a particle, with no size. A realistic pendulum is a small, uniform diskof massMand radiusRat the end of a massless string, withLbeing the distance from the pivot to the center of the sphere. Find an expression for the period of this pendulum. SupposeM

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?