Need
the first law of thermodynamics states that . is this also a statement of the principle of conservation of energy?
yes, the heat added and the change in internal energy of the gas equal the work done by the piston.
yes, the heat that flows into the system is used to change the internal energy of the gas and becomes work done by the piston.
no, the heat that is added to the system is only used to do work.
no, the change in internal energy is the energy lost in the system.

Ithink the answer is c. make unnecessarily  wide gestures 

Stars are born within the clouds of dust and scattered throughout most galaxies. a familiar example of such as a dust cloud is the orion nebula. turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction. as the cloud collapses, the material at the center begins to heat up. known as a protostar, it is this hot core at the heart of the collapsing cloud that will one day become a star. three-dimensional computer models of star formation predict that the spinning clouds of collapsing gas and dust may break up into two or three blobs; this would explain why the majority the stars in the milky way are paired or in groups of multiple stars.therefor, i would say the answer is: dust and gases contract.i hope this ! < 3