8 Energy – forces doing work

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Question 9

During a test, a floor-polishing machine receives 18 kJ of energy. The energy transferred usefully is three times the energy dissipated. Its mean useful power output is 500 W. What is the duration of the test?

[1]

$s27\ \mathrm{s}$

$s24\ \mathrm{s}$

$s9\ \mathrm{s}$

$s36\ \mathrm{s}$

8 Energy – forces doing work

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81

Question 9

During a test, a floor-polishing machine receives 18 kJ of energy. The energy transferred usefully is three times the energy dissipated. Its mean useful power output is 500 W. What is the duration of the test?

[1]

$s27\ \mathrm{s}$

$s24\ \mathrm{s}$

$s9\ \mathrm{s}$

$s36\ \mathrm{s}$

8 Energy – forces doing work

Question 9

Markscheme

8 Energy – forces doing work

Question 9

Markscheme

8 Energy – forces doing work

Question 9

8 Energy – forces doing work Questions

8 Energy – forces doing work

Question 9

8 Energy – forces doing work Questions