Question

A machine is able to lift 200 kg of bricks vertically up to a height of 30 m above the ground in 50 s. What is the power of the machine? (Take the acceleration due to gravity, g, to be 10 ms−2.)

Answer 1

Answer:

Explanation:

Power = work / time  

Work = Force x Distance  

Work = (10 * 200) * (30) = 6 x 10^4 J  

Power = (6 x 10^4 J) / (50 s) = 1.2 x 10^3 watts  

I left off the units when calculating work for simplicity, and you may wish more decimal places than I have included.

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Answer 2

Answer:

1.2 kW

Explanation:

Power = work / time  

Work = Force x Distance  

Work = (10 × 200) × (30) = 6 × $10^4$J

Power =  $\frac{6 . 10^{4} }{50}$= 1.2 kW

Note :

. = multiply

kW = Kilowatts

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