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Unformatted text preview: 2. Suppose that there is very little friction in the pulley system. Compare the work done by friction using the pulleys to the work done by friction to drag the bucket up the trail. Explain what this tells you about the frictional force. 3. A 747 airliner filled with passengers has a mass of about 450,000kg. Find its potential energy relative to the ground when it is cruising at 12,000m. Explain where this energy came from. 4. Each wheel in your car rests on a spring that has a spring constant of about 25,000N/m. Find the energy that gets stored in one of the springs when you go over a 12.0cm high speed bump. river trail village 50.0m 75.0m...
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- Fall '09