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new^2^physics
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Homework Statement
A gas sample heated in a cylinder used 650 kJ of heat. A piston that compresses the gas does 800 kJ of work. What is the change in internal energy, ΔE, of the gas during this process
Homework Equations
ΔE = q + w
The Attempt at a Solution
ΔE = q + w
ΔE = (650kJ) + (800 kJ)
ΔE = 1450 kJ
a result of the gas being heated and compressed, the energy of the gas increases by 1450 kJ. Is this at all correct? Or should it be -650 kJ? Thank you for your help.