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Work, Energy and Power
Question
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A truck draws a tractor of mass 1000 kg at a steady rate of 20 m/s on a level road. The tension in the coupling is 2000 N. Calculate the power spent on the tractor? 


A truck of weight 2x 105N can move up a road

having a slope of 1 in 50 with a speed of 8 m/s. The resistive force of road is one twenty-fifth of the weight of truck. What is power of truck?

Answer

Given, 
Mass of the tractor, m = 1000 kg 
Speed of the tractor, v = 20 m/s
Tension in coupling = Force applied
Force, F = 2000 N
Using the formula for power, we have
Power spent on the tractor, P = 2000 x 200 = 40000 Watt = 40 kW

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