A jet of water of 0.002 m2 area moving with a velocity of 15 m/s strikes on a series of blades moving with a velocity of 6 m/s. The force exerted on the blades will be

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UKPSC JE Mechanical 2013 Official Paper II
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  1. 0.18 N
  2. 270 N
  3. 27 N
  4. 180 N

Answer (Detailed Solution Below)

Option 2 : 270 N
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UKPSC JE CE Full Test 1 (Paper I)
180 Qs. 360 Marks 180 Mins

Detailed Solution

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Concept:

Force exerted on the blades by a jet is given by

F = ρAv(v - u)

Calculation:

Given:

A = 0.002 m2, v = 15 m/s, u = 6 m/s, ρ = 1000 kg/m3

F = ρAv(v - u)

F = 1000 × 0.002 × 15(15 - 6)

F = 270 N

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