A student throws a set of keys vertically upward to his fraternity brother, who is in a window 4.20 m above. The brother's outstreched hand catches the keys 1.80 s later. (a) With what initial velocity were the keys thrown

The 5-kg cylinder is initially at rest when it is placed in contact with the wall b and the rotor at a. if the rotor always maintains a constant clockwise angular velocity v = 6 rad> s, determine the initial angular acceleration of the cylinder. the coefficient of kinetic friction at the contacting surfaces b and c is mk = 0.2.

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

How did the germans define who was jewish?