answer-253

Question	Answer	Extra information
1	any two from: bungee rope may snap rope may extend too much student may land in the river [2 marks]
2	gravitational potential [1 mark] kinetic [1 mark] elastic potential [1 mark]	correct order only
3	0.1 (Ôü░C) [1 mark]
4	power = energy transferred / time [1 mark]	allow P = E / t allow E = P x t
5	1050 / 300 [1 mark] 3.5 (W) [1 mark]	accept 3.5 (W) with no working shown for 2 marks
6	chemical [1 mark] kinetic [1 mark]	correct order only
7	Ek = 0.5 ├ù 80 ├ù 122 [1 mark] Ek = 5760 (J) [1 mark]	accept 5750 (J) with no working shown for 2 marks
8	P = 120 000 / 8.0 [1 mark] P = 15 000 (W) [1 mark]	accept 15 000 (W) with no working shown for 2 marks
9	energy is transferred in heating the surroundings [1 mark] friction causes energy to be transferred in non-useful ways [1 mark]
10	gravitational potential energy = mass ├ù gravitational field strength ├ù height [1 mark]	allow Ep = m g h
11	Ep = 280 x 9.8 x 14 [1 mark] Ep = 38 416 (J) [1 mark] Ep = 38 000 (J) [1 mark]	accept 38 000 with no working shown for 3 marks an answer that round to 38 000 scores 2 marks

Energy Exam Questions