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3 Conservation of energy

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Question 1

A lift rises through a tall building and slows down as it approaches the top floor. During this part of its journey, the lift's gravitational store increases by 530 kJ and its kinetic store decreases by 40 kJ. A further 210 kJ is transferred to thermal stores of the motor, cables and surroundings. How much energy is transferred electrically to the lift's motor during this part of the journey?

[1]
A

700 kJ700\ \mathrm{kJ}700 kJ

B

740 kJ740\ \mathrm{kJ}740 kJ

C

280 kJ280\ \mathrm{kJ}280 kJ

D

780 kJ780\ \mathrm{kJ}780 kJ

Markscheme

3 Conservation of energy Questions

  1. GCSE
  2. /Physics
  3. /3 Conservation of energy

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