We wrap a light, nonstretching cable around a 8.00 kg solid cylinder with diameter of 30.0 cm. the cylinder rotates with negligible friction about a stationary horizontal axis. we tie the free end of the cable to a 13.0 kg block and release the block from rest. as the block falls, the cable unwinds without stretching or slipping. how far will the mass have to descend to give the cylinder 510 j of kinetic energy?

h = 16.67m

Explanation:

If the kinetic energy of the cylinder is 510J:

Where the inertia is given by:

Replacing this value:

Speed of the block will therefore be:

By conservation of energy:

Eo = Ef

Eo = 0

So,

Solving for h we get:

h=16.67m

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

wavelength divides in half and speed stays the same.