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Water flowing along an open channel drives an undershot waterwheel of radius 2 m (figure). The water approaches the wheel with a speed of 5.0 ~m / s and leaves with a speed of 2.5 ~m / s ; the amount of water passing by is 200 kg per second. At what rate does the water deliver angular momentum to the wheel ( in kJ ) ?

Correct answer

1

Step-by-step solution

d L d t = d m d t (v₁-v₂ ) R=200 (5-2.5) 2=1000 ~J

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