Engineering Board Exam Reviewer · Fluid Mechanics · hard
A 50 mm water jet with velocity 20 m/s strikes a flat plate normally. The plate moves away from the jet at 8 m/s. What is the force on the plate?
- 785.4 N
- 471.2 N
- 1539.4 N
- 282.7 N
Answer
D. 282.7 N
Solution
For a single moving plate the relative velocity is (V − u): F = A(V - u)2 = 1000(0.001963)(122) = 282.7 N.
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