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8 Energy – forces doing work

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Question 62

A spring drives a rotor inside a sealed, insulated casing. The spring, rotor and casing form a closed system. At the first measurement, the elastic potential energy store of the spring is 15 J and the kinetic energy store of the rotor is 3.0 J. At the second measurement, the kinetic energy store of the rotor is 11 J. No other energy stores change between the two measurements.

What is the elastic potential energy store of the spring at the second measurement?

[1]
A

7.0 J7.0\ \mathrm{J}7.0 J

B

4.0 J4.0\ \mathrm{J}4.0 J

C

8.0 J8.0\ \mathrm{J}8.0 J

D

18 J18\ \mathrm{J}18 J

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8 Energy – forces doing work Questions

  1. GCSE
  2. /Physics
  3. /8 Energy – forces doing work

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