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UPSC Civil Service Exam Questions - Engineering

Q1:

A water jet 0.02 m2 in area has a velocity of 15 m/s. If the jet impinges normally on a plate which is moving at a velocity 5 m/s in the direction of the jet, what is the force on the plate due to this impact ? (Density = 1000 kg/m3)

A 200 N

B 2000 N

C 20000 N

D 4000 N

ANS:B - 2000 N

Answer = 1000 x a x (V-v)^2.
= 2000N.