Question

A rectangular water reservoir is `10. 8 mb y3. 75 m` at the base. Water flows into it at the rate of `18 mp e r` second through a pipe having the cross section `7. 5 c mx4. 5 c mdot` Find the height to which the water will rise in the reservoir in `30m inu t e sdot`

Answer 1

Speed of water=18 m per s
`1s=18m`
length of water`=30*60s=30*16*18m`
Volume of water filled=volume of water flowed
`18.8*3.75*x=7.5/100*4.5/100*30*16*18`
`x=24/1000=0.024m`.