Question

A jet of water of diameter 10 cm strikes a flat plate normally with a velocity of 20 m/s. the plate is moving with a velocity of 9 m/s in the direction of jet & away from the jet then, work done by the plate per second is *

Answer 1

Explanation:

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Answer 2

Answer:

work done by the plate per second is $7196.25 N$

Explanation:

Given

Diameter, d = 20cm

Velocity, v = 20 m/s

Find

Force exerted by the jet  

Introduction:

    When a tiny hole in a big reservoir connects to the environment, a free jet is formed. A free jet might happen on the container's bottom or side. However, the Bernoulli equation may be used to characterise its features wherever it occurs. A jet is a fluid stream that is propelled into the surrounding medium, generally through a nozzle, aperture, or orifice.

Step #2 of 2

     Jets have the ability to fly great distances without dispersing. When compared to the surrounding fluid medium, jet fluid has a greater momentum.

   Turbines rotate as a result of the force produced by one or more water jets directed tangentially onto the vanes or buckets of the turbine. The water's impact on the vanes causes a torque on the wheel, which causes it to spin and create energy.

Solution:

Calculate the force exerted by the jet

$\begin{aligned} F &=\rho A V^{2} \\ &=1000 \times \frac{\pi}{4} \times 5^{2} \times 20^{2} \\ &=7196.25 \mathrm{~N} \end{aligned}$