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Q.

The power of a crane is 6.25 kW. How much mass in kg of coal it can lift in 1 hour from a mine of 100 m depth? The efficiency of the crane is 80%

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a

1800

b

18000

c

180

d

180000

answer is B.

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Detailed Solution

80100x6.25 x1000 =m x 10 x100 3600m =18,000 kg
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The power of a crane is 6.25 kW. How much mass in kg of coal it can lift in 1 hour from a mine of 100 m depth? The efficiency of the crane is 80%