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osheari1

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## Homework Statement

One mole of a monatomic ideal gas is taken through the reversible cycle shown below.

http://img508.imageshack.us/img508/2595/newbitmapimageqm.png

process bc is an adiabatic expansion, with P_b = 10.00 atm and V_b = 10^-3 m^3.

Find (a) the energy added to the gas as heat. (b) find the energy leaving the gas as heat, (c) the net work done by the gas, and (d) the efficiency of the cycle.

## Homework Equations

PV=nRT (ideal gas)

PV^(gamma) = constant

gamma = C_p/C_v

V^(gamma-1)T = constant

U = (3/2)nRT (for a monatomic gas)

## The Attempt at a Solution

I really don't know how to start this problem

I know for the bc section of the cycle Q = 0 because its an adiabatic expansion.

I also solved for the temperature at point b T = PV/(nR) = (1.0132*10^6Pa)(10^-3m^3)/(1mole)(8.315) = 121.85 K

from here I am not sure what to do because I am not given gamma or the pressure at a or c

Your help is much appreciated

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