Physics Review Question

Unit: Energy
Year: 1988 Question#: 14
Question: What is the spring constant of a spring of negligible mass which gained 8 joules of potential energy as a result of being compressed 0.4 meters?

(1 ) 100N/m
(2 ) 50N/m
(3 ) 0.3N/m
(4 ) 40N/m

What is this question really asking?




Explanation by: Cory V
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Answer 1
100N/M

CORRECT

By using PEs=1/2KX2 you can plug in the potential energy and change in spring length from its original equalibrium position to find what the constant is. return to top























Answer 2
50N/M

INCORRECT

This answer would result if you left the spring constant as 1/2 the potential energy Use this formula more carefully.
PEs=1/2KX2 return to top



























Answer 3
0.3N/M

INCORRECT

Try using PEs=1/2KX2 return to top


























Answer 4
40N/M
INCORRECT

Try using PEs=1/2KX2 return to top


























What's this question really asking?

If a spring is compressed from its origional length of .4 meters ,it gains 8 Joules of potential energy; what is its' spring constant? return to top

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