A mass m = 50 kg is attached to a light string which is wrapped around a cylindrical spool of radius R = 0.1 m and moment of inertia I = 4.0 kgᐧm2. The spool is suspended from the ceiling and the mass is released from rest a distance h = 5 m above the floor. How long does it take for the mass to hit the floor?

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

What is the coefficient of kinetic friction μk between the block and the tabletop?

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?