1.

the gauge pressure of 3 into 10 power 5 Newton per metre square must be maintained in the main water pipe of a City. how much work must be done to pump 50000 M cube of water at a pressure of 1 into 10 power 10 Joules

Answer»

# ANSWER- 15×10^9 joules.

# Explanation-

To solve this kind of problems you must take CARE to put everything in same system of units preferably SI units.

# Given-

Pressure P = 3×10^5 N/sq.m

Pumped water dV = 50000cu.m = 5×10^4cu.m

# Solution-

WORK done for PUMPING water is givem by

W=PdV

W = 3×10^5 × 50000

W = 15×10^9 Joules.

# TOTAL work done in pumping the water out is 15×10^9 joules.

Hope that cleared it...


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