Physics Review Question Unit: energy Year: 1989 Question#: 24 Question: A spring of negligible mass with a spring constant of 200 newtons per meter is stretched 0.2 meters. How much potential energy is stored in the spring? (1 ) 40 J (2 ) 20 J (3 ) 8 J (4 ) 4 J What is this question really asking? Explanation by: Jill S [ Return to question menu ] Answer 1 40 J INCORRECT 40 J is the incorrect answer because you have to use the formula return to top Answer 2 20 J INCORRECT 20 J in incorrect because of the formula that is needed to find potential energy is , . To get the wrong answer of 20 J you had to of used the formula wrong. One way that the answer of 20 J could of been found is by not squaring the x, .2 m. return to top Answer 3 8 J INCORRECT .8 J in incorrect because of the formula that is used to find potential energy, . To get the answer of .8 J you had to of used the formula wrong. If you did not multiply by 1/2 you would get .8 J. return to top Answer 4 4 J CORRECT 4 J is the correct answer because of the formula that is used to find the potential energy, . K= the spring constant, 200 newtons/meter and x=the distance that the spring is stretched. PE=1/2(200 N/m)(.2 m)2 PE=4 J return to top What's this question really asking? How much potential energy is in the spring? return to top |
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