In an undershot water wheel, the cross-sectional ara `a=0.1m^(2)` of the stream is striking the series of radial flat vanes of the wheel. The velocity of stream is `6m//s`. The velocity of vanes is `3m//s`. If the power supplied by jet (in watts) is `2700K` find `K`.

Answer

2

Explanation

Mass of water striking vanes/sec`=rhoav`
Initial velocity `=v`
Final velocity of water `=u`
Change in velocity `=v-u`
`F=` force on the vane `=rhoav(v-u)`
Work done `=fxxu=rhoavu(v-u)=5400` watts
`impliesK=2`