61. The layer of ice has a mass of ()35ice917 kg/m (400 m 500 m 0.0040 m)7.34 10 kg.m=××=×This added to the mass of the hundred stones (at 20 kg each) comes to m= 7.36 ×105kg. (a) Setting F= D(for Drag force) we use Eq. 6-14 to find the wind speed valong the ground (which actually is relative to the moving stone, but we assume the stone is moving slowly enough that this does not invalidate the result):
This is the end of the preview. Sign up
access the rest of the document.