A cast-iron “12-pounder” cannonball rolls off the deck of a ship and falls into the ocean at a location where the depth is 1000 m. Estimate the time that elapses before the cannonball hits the sea...

A cast-iron “12-pounder” cannonball rolls off the deck

of a ship and falls into the ocean at a location where the

depth is 1000 m. Estimate the time that elapses before

the cannonball hits the sea bottom.

The Stokes drag law for smooth spheres is to be verified

experimentally by dropping steel ball bearings in glycerin.

Evaluate the largest diameter steel ball for which Re , 1

at terminal speed. Calculate the height of glycerin column

needed for a bearing to reach 95 percent of terminal speed.