A stream of water of density d, cross-section A and speed v strikes a wall that is perpendicular to the stream as shown. The water then flows sideways along the wall. The force exerted by the stream on the wall is –
Text Solution
Verified by ExpertsThe correct answer is:
A
The mass of water reaching the wall per second
= v Ad.
the momentum transferred per second = (vAd)v
per unit time = v 2 Ad.
The flow of water, tangential to the wall does not contribute to the force.
Therefore, force = rate of change of momentum
= v 2 Ad.
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