The fire fighters have a jet attached to the held of their water pipes

The fire fighters attach brass jets at the end of water pipes. Why?

The reading of pressure meter attached with a closed water pipe is 3.5 xx 10^(5) Nm^(-2) . On opening the valve of the pipe, the reading of pressure meter is reduced to 3 xx 10^(5) Nm^(-2) . Calculate the speed of water flowing out of the pipe.

Why is it difficult for a fire fighter to hold a hose that ejects large amount of water at high speed?

Why is it difficult for a fire fighter to hold a hose that ejects large amount of water at high speed?

A pipe having an internal diameter D is connected to another pipe of same size. Water flows into the second pipe through n holes, each of diameter d. if the water in the first pipe has speed v, the speed of water leaving the second pipe is

A pipe having an internal diameter D is connected to another pipe of same size. Water flows into the second pipe through 'n' holes, each of diameter d. If the water in the first pipe has speed v, the speed of water leaving the second pipe is

The horizontal speed of a jet of water is 100 cm/sec and 50 cm^3 of water hits the plate each second. Assume that the water moves parallel to the plate after striking it. The force exerted on the stationary plate if it is held perpendicular to the jet of water is :