Mechanical Energy Supplementary Questions&Key.docx - Supplementary Questions 1 Mary runs home form her friends house at a speed of 4.9m/s She weighs

Mechanical Energy Supplementary Questions&Key.docx -...

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Supplementary Questions 1. Mary runs home form her friend’s house at a speed of 4.9m/s. She weighs 48kg. Determine the kinetic energy she expends. 2. If the speed of a 1.0kg kitten is 5.om/s, what is its kinetic energy? 3. A 60.0kg student is running at a constant speed of 3.50m/s. Find the kinetic energy of the student. 4. If the kinetic energy of a 3.00kg ball is 2.00x10 3 J, what is the speed of the ball? 5. If 5.5x10 6 J of energy were produced over 60s by a 1.5x10 6 kg train, what is the distance the train travelled in 60s? 6. A 40kg mass of iron sitting on a barge is ready to fall 5.0m into the ocean. What is the energy that would be released if it fell? 7. A large boulder weighting 500kg is sitting on a ledge 10.0m above the ground. What is its potential energy?
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8. Lane, a bow hunter, must pull his bow back with a force of 14N over a distance of 20cm to shoot an arrow. Determine the potential energy of the system. 9. A truck of unknown mass accidentally leaves the road and begins to fall over a 10m cliff. If the potential energy of the truck is 2.5x10 5 J what is the mass of the truck? 10. If a hydroelectric plant produces 5x10 9 J from a dam 60m high what is the mass of water passing through the turbines?
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