- #1
Titan97
Gold Member
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Homework Statement
Homework Equations
$$PV^{\gamma}=\mathrm{constant}$$
The Attempt at a Solution
Initially, the piston will get a velocity ##v##.
But the chamber will move too because of the forces exerted by the gas.
Since total external force is zero, velocity of centre of mass is constant.
Initial velocity of centre of mass: $$\frac{mv+4m\times 0}{m+4m}=\frac{v}{5}$$
Then I used energy conservation.
with respect to earth, final velocity of both piston and chamber will be zero. (right?)
$$\frac{1}{2}m{v}^2=nC_{\mathrm{V}}\Delta T$$
I got $$\Delta T=\frac{mv^2}{3nR}$$.
But the answer given is $$\Delta T=\frac{4mv^2}{15nR}$$.