8 Energy – forces doing work

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Question 21

While smoothing a wooden surface, an electric sander receives $J12\,000\ \mathrm{J}$ of energy in 20 s. Its efficiency during this interval is 0.75. What is the useful power output of the sander?

[1]

$W450\ \mathrm{W}$

$W800\ \mathrm{W}$

$W600\ \mathrm{W}$

$W150\ \mathrm{W}$

8 Energy – forces doing work

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Question 21

While smoothing a wooden surface, an electric sander receives $J12\,000\ \mathrm{J}$ of energy in 20 s. Its efficiency during this interval is 0.75. What is the useful power output of the sander?

[1]

$W450\ \mathrm{W}$

$W800\ \mathrm{W}$

$W600\ \mathrm{W}$

$W150\ \mathrm{W}$

8 Energy – forces doing work

Question 21

Markscheme

8 Energy – forces doing work

Question 21

Markscheme

8 Energy – forces doing work

Question 21

8 Energy – forces doing work Questions

8 Energy – forces doing work

Question 21

8 Energy – forces doing work Questions