In an isothermal system, a chamber is filled with gas and a piston rests atop the chamber. The initial internal energy of the system is 3,500 J. When heat is added
to the gas, the piston rises. If 2,000 J of heat is added to the system, how much
work will the gas do on the piston? (Assume this is an ideal system in which
energy transfer is 100% efficient.)

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grav forces affect all objects magnetic forces affect magnetic objects and electric currents

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.