First slide

Second law

Question

Waterjet is coming out of a hose pipe of diameter 20 cm with speed 20 cm/sec. It strikes a man in elastically. Find the force exerted by water jet on the person

Easy

A

5.04 N
B

1.26 N
C

2.52 N
D

9.4 N

Solution

$\begin{array}{l} F = v \frac{dm}{dt} = v (ρAv) = {ρAv}^{2} \\ = (1000) [3 .14 \times 10^{- 12}] (0 .2)^{- 2} = 1 .26 N \end{array}$

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