0.250 moles of gas are in a piston. The gas does 109 J of work while 240 J of heat are added. What is the change in internal energy? (Be careful with + and - signs. +W = expansion, +Q =added, +ΔU = temp goes up)

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Aplane travels 1000 miles in 5 hours .what is the planes average speed?

Which of these statements is true? a. quarks pair with leptons to form protons and neutrons. b. quarks pair with bosons to form photons. c. quarks pair with photons to form protons and neutrons. d. quarks pair with other quarks to form protons and neutrons. e. quarks pair with electrons to form protons.

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.