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8 Energy – forces doing work

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Question 100
H

A sealed, insulated container contains a battery, motor and paddle in water. The paddle starts and finishes at rest. The battery chemical store decreases by 800 J. No other non-thermal store changes. Which describes the overall change?

[1]
A

Thermal stores gain 800 J800\ \mathrm{J}800 J; total energy is unchanged

B

Thermal stores gain 800 J800\ \mathrm{J}800 J; total energy increases

C

Thermal stores lose 800 J800\ \mathrm{J}800 J; total energy decreases

D

Thermal stores lose 800 J800\ \mathrm{J}800 J; total energy is unchanged

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8 Energy – forces doing work Questions

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

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