ISRO Mechanics 2018

1. A truck hauls a trailer at 60 km/hour when exerting a steady pull of 600 N. If the work is done for 40 minutes, the power required is

(a) 6 kW

(b) 4 kW

(c) 2.4 kW

(d) 10 kW 

Answer

2. Two blocks A and B of 1 kg each are kept on a flat surface, one above other. The coefficient of friction between each contacting pair is 0.2. If the lower block is pulled with a horizontal force F, the minimum value of F for which the slip occurs between the blocks is nearly

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(a) 5.9 N

(b) 4.9N

(c) 18.4N 

(d) 0

Answer

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