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key - Ramanujan & Raman
PHYSICS PROBLEM OF THE DAY Problem 3 : A piston-cylinder device contains 0.05m 3 of a gas initially at 200kPa. At this state a linear spring that has spring constant of 150 kN/m is touching the piston shown in figure but exerting no force on it. Now heat is transfered to the gas, causing the piston to rise and to compress the spring until the volume inside the cylinder doubles. If the cross-sectional area of the piston is 0.25m 2 , then the total work done by the gas is [ ] (a) 10 kJ (b) 20 kJ (c) 13 kJ (d) 26kJ For answer visit : www.ramanujanandraman.com Phone No: 9885080592 Ans: c
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