Two average forces . A steady stream of 0.321 kg snowballs is shot perpendicular
ID: 1340825 • Letter: T
Question
Two average forces. A steady stream of 0.321 kg snowballs is shot perpendicularly into a wall at a speed of 4.80 m/s. Each ball sticks to the wall. The figure 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 intervaltr = 50.0 ms, last a duration time interval td = 14.0 ms, and produce isosceles triangles on the graph, with each impact reaching a force maximumFmax = 220 N. During each impact, what are the magnitudes of (a) the impulse and (b) the average force on the wall? (c) During a time interval of many impacts, what is the magnitude of the average force on the wall?
Explanation / Answer
the magitude of impulse on the wall for eacj impact
Impulse = area of isocrles triangle
Impulse = 0.5 * b* ht
Impulse = 0.5* 220 * 50 e -3
I = 5.5 Ns
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magnitude of force F = n * Ivg/n DT
F = 5.5 /50 e -3
F = 110 N
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Avg force = - 110 N