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A pump is to lift 29.0 kg of water per minute through a height of 3.70 m. What output rating (watts) should the pump motor have?
An airplane pilot fell 380 m after jumping without his parachute opening. He landed in a snowbank, creating a crater 1.2 m deep, but survived with only minor injuries. Assume that the pilot's mass was 75 kg and his terminal velocity was 50 m/s.
(a) Estimate the work done by the snow in bringing him to rest.
J
(b) Estimate the average force exerted on him by the snow to stop him.
N
(c) Estimate the work done on him by air resistance as he fell.
A pump is to lift 29.0 kg of water per minute through a height of 3.70 m. What output rating (watts) should the pump motor have?
An airplane pilot fell 380 m after jumping without his parachute opening. He landed in a snowbank, creating a crater 1.2 m deep, but survived with only minor injuries. Assume that the pilot's mass was 75 kg and his terminal velocity was 50 m/s.
(a) Estimate the work done by the snow in bringing him to rest.
J
(b) Estimate the average force exerted on him by the snow to stop him.
N
(c) Estimate the work done on him by air resistance as he fell.
