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songoku
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Homework Statement
Molecules of hydrogen, each has mass of 3.3 x 10-27 kg, move with speed 1.6 kms-1 hit a wall at angle π/3 rad to the normal. If there are 2.0 x 1020 molecules s-1 hit the area of 1.2 x 10-4 m2, find:
a. the average normal force on the wall if all the molecules are absorbed by the wall
b. the average normal force on the wall if all the molecules are reflected
c. pressure exerted by case (a) and (b)
Homework Equations
P = F/A
p = mv (momentum)
Δp = F.Δt
The Attempt at a Solution
Δp = F.Δt
Nmv = F cos (π/3) . t ; N = number of molecules
F = (N/t . m . v) / cos π/3
What is the difference when the molecules are absorbed and when reflected? Thanks