First slide

Potential energy

Question

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%

Moderate

A

1800
B

18000
C

180
D

180000

Solution

$\frac{80}{100} x 6.25 x 1000 = \frac{m x 10 x 100}{3600}$
m =18,000 kg

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