Question: A gas is contained in a piston-and-cylinder system, oriented vertically. On top of the cylinder there is a mass. When the gas is heated it expands, and the mass is lifted. The energy used to lift the mass is exactly the same as the energy absorbed from the heater. What are the signs for q, w and AU, respectively? A. q = +; w = +; AU = + B. q = +; w = -;AU = 0 C. q = -; w= +;AU = 0 D. q = -; w= - ;AU = –

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Question: A gas is contained in a piston-and-cylinder
system, oriented vertically. On top of the cylinder there is
a mass. When the gas is heated it expands, and the mass
is lifted. The energy used to lift the mass is exactly the
same as the energy absorbed from the heater. What are
the signs for q, w and AU, respectively?
A. q = +; w = +; AU = +
B. q = +; w = -;AU = 0
C. q = -; w= +;AU = 0
D. q = -; w= - ;AU = –
Transcribed Image Text:Question: A gas is contained in a piston-and-cylinder system, oriented vertically. On top of the cylinder there is a mass. When the gas is heated it expands, and the mass is lifted. The energy used to lift the mass is exactly the same as the energy absorbed from the heater. What are the signs for q, w and AU, respectively? A. q = +; w = +; AU = + B. q = +; w = -;AU = 0 C. q = -; w= +;AU = 0 D. q = -; w= - ;AU = –
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