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57. 4 m of water is to be pumped to a height of 20 m and forced into a resorvoir at a pressureof 2 x 10the work done by the motor is (external pressure- 10'm)(B) 16x103 J(C) 12x103 J(D) 32x 10 J(A) 8x10J |
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Answer» Work done is = Volume of water pumped at a constant pressure * constant excesspressure over atmospheric pressure P = excess pressure = 2* 10⁵ N/m² -+1* 10⁵ N/m² = 3* 10⁵ N/m²Volume of water pumped = V2 - V1 = V = 4 m³ W = P *V= 3* 10⁵ N/m² *4 m³= 12*10^5Joules |
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