Two horizontal jets are pointed at two different surfaces. Surface 1 deflects th

Question

Two horizontal jets are pointed at two different surfaces. Surface 1 deflects the jet 90 degrees such that the jet exits in the downwards direction. Surface 1 is supported by a horizontal force F1 directed towards the incoming jet. Surface 2 deflects the jet 180 degrees such that the jet exits in in a horizontal direction directed back towards the incoming jet. Surface 2 is supported by a horizontal force, F2, directed towards the incoming jet. How are F1 and F2 related? The mass flow rates and velocities of the two jets are the same, and the cross sectional areas of the jets do not change noticeably. F_1 = F_2/2| F_1 = 2F_2| F_1 = F_2| F_1 = 0, F_2 > F_1| F_2 = 0, F_1 > F2|

Explanation / Answer

>> As, Force is due to Momentum Change

and, in Case 1, When Surface Deflects by 90, momentum will change by 21/2 times Mass*Velocity

>> and, in case 2, When Surface Deflects by 180, momentum will change 2 time the Mass*Velocity

So, F2 > F1

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