An iron nail is driven into a block of ice by a
single blow of a hammer. The hammerhead
has a mass of 0.6 kg and an initial speed of
1 m/s. Nail and hammer are at rest after the
blow.
How much ice melts? Assume the temperature of both the ice and the nail is 0◦C before
and after. The heat of fusion of ice is 80 cal/g.
Answer in units of g.

Aplane flying horizontally at an altitude of 1 mile and a speed of of 500mih passes directly over a radar station. find the rate at which the distance from the plane to the station is increasing when it is 2mi away from the station.

Lightning is an example of what phenomenon? a release of a large amount of energyan absorption of a large amount of energya natural electric circuita natural electric current

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.