- Messages
- 75
- Reaction score
- 151
- Points
- 43
Wall area = A m²
Volume of air colliding with wall per sec .. V/s(m³/s) = u(m/s) x A(m²) = uA
Mass colliding per sec .. m/t (kg/s) = V/s(m³/s) x D(kg/m³) = uA D
Force = rate of change of momentum ..
F = (mv - mu) / t = m/t (v-u) .. .. assuming the air comes to rest, then v = 0 and ..
F = -(m/t)u .. .. (against the motion)
F = (uAD)u .. .. u²AD .. .. ►F = 33² x A x 1.20 .. (N)
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