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HEAT LOST from the GAS is Negative HEAT SUPPLIED To the gas is POSITIVE Work Done on the Gas is POSITIVE(Means Compress gas) Work done by the gas is NEGATIVE(Means Expand Gas) Internal Energy = Work DOne + Heat Internal Energy = Kinetic Enery + Potential energy Hope this helps

A car of mass 1500kg arrives at the foot of a straight hill traveling at 30m/s. it reaches the top of the hill 40 seconds later traveling at 10m/s. The length of the hill is 1km and the gain in height is 120metres. The average resistance to the motion is 500N. Find The average power developed...

1 a) A particle P of mass m is placed on a rough plane inclined at an angle tan-1 (5/12) to the horizontal.The coefficient of friction between the plane and P is 0.5. Prove that P will remain stationary. 1b ) A light inextensible string is fastened to P, passes up a line of greatest slope...