1.

(i) Name the physical quantity measured in terms of horse power. (ii) A nut is opened by a wrench of length 20cm. If the least force required is 2N, find the moment of force needed to loosen the nut. (iii) Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.

Answer»

(i) Horse power is another unit of Power. 1 H.P = 746 watt. 

(ii) Given : Force = 2N, d = 20 cm = 0.2 m. Moment of force = Force × distance = 2 × 0.2 = 0.4 Nm.



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