8 Energy – forces doing work

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Question 23

A stair lift carries a passenger to the top of a flight of stairs in 30 s. During the journey, the stair lift transfers 3600 J of energy usefully. Its efficiency is 75%. What is the mean input power of the stair lift?

[1]

$W90\ \mathrm{W}$

$W160\ \mathrm{W}$

$W480\ \mathrm{W}$

$W120\ \mathrm{W}$

8 Energy – forces doing work

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Question 23

A stair lift carries a passenger to the top of a flight of stairs in 30 s. During the journey, the stair lift transfers 3600 J of energy usefully. Its efficiency is 75%. What is the mean input power of the stair lift?

[1]

$W90\ \mathrm{W}$

$W160\ \mathrm{W}$

$W480\ \mathrm{W}$

$W120\ \mathrm{W}$

8 Energy – forces doing work

Question 23

Markscheme

8 Energy – forces doing work

Question 23

Markscheme

8 Energy – forces doing work

Question 23

8 Energy – forces doing work Questions

8 Energy – forces doing work

Question 23

8 Energy – forces doing work Questions