8 Energy – forces doing work

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Question 85

H

A hoist has an input power of 1.2 kW and an efficiency of 0.75. It lifts a 180 kg load through a vertical height of 5.0 m at constant speed. Gravitational field strength is 10 N/kg. How long does the lift take?

[1]

$s10\ \mathrm{s}$

$s13\ \mathrm{s}$

$s5.6\ \mathrm{s}$

$s7.5\ \mathrm{s}$

8 Energy – forces doing work

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Question 85

H

A hoist has an input power of 1.2 kW and an efficiency of 0.75. It lifts a 180 kg load through a vertical height of 5.0 m at constant speed. Gravitational field strength is 10 N/kg. How long does the lift take?

[1]

$s10\ \mathrm{s}$

$s13\ \mathrm{s}$

$s5.6\ \mathrm{s}$

$s7.5\ \mathrm{s}$

8 Energy – forces doing work

Question 85

Markscheme

8 Energy – forces doing work

Question 85

Markscheme

8 Energy – forces doing work

Question 85

8 Energy – forces doing work Questions

8 Energy – forces doing work

Question 85

8 Energy – forces doing work Questions