flight- energy gravitational potential exercises continued.

Solution

The water flowing out of the stream at the base of the mountain per minute is
60 X 60 kg = 3600kg/minute.

This amount of water descended 457 metres down the mountain so the gravitational potential energy released is

mgh = 3600 X 9.8 X 457 = 176400 joules

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Solution

After the skydivers have jumped the plane has a mass of
3,450 - 5 X 89.3 = 3003.5

The gravitational potential energy is

mgh = 3003.5 X 9.8 X 2,500 =

73,585.75 kilojoules

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Gravitational potential energy exercises cont.
A stream meanders down the side of a mountain 457m high. Water flows through the stream at a rate of 60kg /second. Calculate the amount of gravitational potential energy released by the water every minute as it flows to the bottom of the mountain. Solution
	A plane with a total mass of 3,450Kg carries 5 skydivers 2.5 km above Melbourne. The average mass of each skydiver is 89.3kg. Assuming the mass of fuel does not change significantly calculate the gravitational potential energy of the plane and pilot after the skydivers have jumped. Solution