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# In a 94 s interval, 642 hailstones strike a glass window of area 0.878 m2 at an angle 34◦?

to the

window surface. Each hailstone has a mass of

8 g and speed of 9.7 m/s.

If the collisions are elastic, find the average

force on the window.

Answer in units of N.

2. Find the pressure on the window.

Answer in units of N/m

2

### 1 Answer

Relevance

- NCSLv 72 months ago
Usually

F = m * dv/dt

but here

F = dm/dt * v

since the velocity is constant and it's the mass that changes

F = 642*0.008kg/94s * 2*9.7m/s*sin34º = 0.593 N

p = F/A = 0.675 Pa

or 675 mPa

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