# A stream of water strikes a stationary turbine bladehorizontally, as the drawing illustrates. The incident water streamhas a velocity of +18.0 m/s, wh

A stream of water strikes a stationary turbine bladehorizontally, as the drawing illustrates. The incident water streamhas a velocity of +18.0 m/s, while the exiting water stream has avelocity of -18.0 m/s. The mass of water per second that strikesthe blade is 17.0 kg/s. Find themagnitude of the average force exerted on the water by theblade.
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SchepperJ
This is essentially a momemtum / impulse problem.... Consider an exact 1 second interval as the timein which the force acts. Assume a constant mass of water inthat time.
Then Newton's 2nd Law: $F=\frac{dp}{dt}=\mathrm{△}p$
$=m\mathrm{△}v$

$=-612N$
The question asks for magnitude, so plug in F = 612 N