They should be bigger as if it is hot the tracks will expand as it is made of metal and then there is more room for it to expand or contract
To solve this problem we must resort to the Work Theorem, internal energy and Heat transfer. Summarized in the first law of thermodynamics.

Where,
Q = Heat
U = Internal Energy
By reference system and nomenclature we know that the work done ON the system is taken negative and the heat extracted is also considered negative, therefore
Work is done ON the system
Heat is extracted FROM the system
Therefore the value of the Work done on the system is -158.0J
Steam enters a cylinder—- A
no.9 indeed all matters are made out of atoms which is smaller than protons and neutrons