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ICSE Class 10 Physics Question 1 of 20

Solved 2017 Question Paper ICSE Class 10 Physics — Question 4

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Question

Question 1(d)

If the power of a motor be 100 kW, at what speed can it raise a load of 50,000 N? [2]

Answer

Given, power P = 100 kW = 100 x 103 W, force F = 50,000 N

Power P = Force (F) x Speed (v)

Substituting the values we get,

100×103=50,000×v⇒v=100×10350,000⇒v=2ms−1100 \times 10^3 = 50,000 \times v \\[0.5em] \Rightarrow v = \dfrac{100 \times 10^3 }{50,000} \\[0.5em] \Rightarrow v = 2 m s^{-1}