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January 27, 2015

January 27, 2015

Posted by **Emily** on Wednesday, December 9, 2009 at 10:44pm.

Answer: twice as much

2-Two cars, one twice as heavy as the other, are lifted to the same elevation in a service station. How do there potential energies compare?

Answer: The heavy object has more potential energy?

3-if a car travels at 50 km/h, it has kinetic energy. How much more kinetic energy does it have at 100 km/h?

Answer=100 squared as much (10000)

4-a force of 50N applied to the end of a lever moves that end a certain distance. If the other end of the lever is moved half as far, how much force does it half.

Answer=twice as much because a small input force produces a large output force?? Or does that only apply to levers when the fulcrum of the relatively close to a load.

5-is it possible to design a machine that has an efficiency that is greater than 100%? Discuss.

Answer: no because the machine converts a small fraction of input energy into heat.

- Physics -
**sarah**, Wednesday, December 9, 2009 at 10:55pma car is traveling at 31.6mi/h on a horizontal highway. the acceleration of the earth is 9.8. if the coefficient of friction is .13, what is the minimum distance in which the car will stop?

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