Two average forces. A steady stream of snowballs of mass m is shot perpendicular

Question

Two average forces. A steady stream of snowballs of mass m is shot perpendicularly into a wall at a speed of v. Each ball sticks to the wall. Figure 9-49 gives the magnitude F of the force on the wall as a function of time t for two of the snowball impacts. Impacts occur with a repetition time interval tr1, last a duration time interval td1, and produce isosceles triangles on the graph, with each impact reaching a force maximum Fmax. During each impact, what are the magnitudes of the impulse and the average force on the wall? During a time interval of many impacts, what is the magnitude of the average force on the wall? Express you answers in terms of tr1, td and Fmax.

Explanation / Answer

a) the impulse is I = Fmax*td*1/2 b) Fmax/2 c) Fmax*td*1/(2*tr)

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