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Physical Science, 5/e

Energy

# Essay Quiz

 1 How is work related to energy? 2 What is the relationship between the work done while moving a book to a higher bookshelf and the potential energy that the book has on the higher shelf? 3 Does a person standing motionless in the aisle of a moving bus have kinetic energy? Explain. 4 A lamp bulb is rated at 100 W. Why is a time factor not included in the rating? 5 Is a kWhr a unit of work, energy, power, or more than one of these? Explain. 6 If energy cannot be destroyed, why do some people worry about the energy supplies? 7 A spring clamp exerts a force on a stack of papers it is holding together. Is the spring clamp doing work on the papers? Explain. 8 Why are petroleum, natural gas, and coal called fossil fuels? 9 From time to time, people claim to have invented a machine that will run forever without energy input and develops more energy than it uses (perpetual motion). Why would you have reason to question such a machine? 10 Define a joule. What is the difference between a joule of work and a joule of energy? 11 Compare the energy needed to raise a mass 10 m on Earth to the energy needed to raise the same mass 10 m on the Moon. Explain the difference, if any. 12 What happens to the kinetic energy of a falling book when the book hits the floor?