Mollie is using springs to hang art projects. (I'm not sure why. Ask her.) She hangs a 3.0 kg picture
on one particular spring and it stretches from 30 cm to 45 cm long.

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.