# Problem: A gas is confined to a cylinder fitted with a piston and an electrical heater, as shown here:Suppose that current is supplied to the heater so that 100 J of energy is added. Consider two different situations. In case (1) the piston is allowed to move as the energy is added. In case (2) the piston is fixed so that it cannot move.In which case is E for the system (the gas in the cylinder) larger?

###### FREE Expert Solution

Internal Energy:

$\overline{){\mathbf{∆}}{\mathbf{E}}{\mathbf{=}}{\mathbf{q}}{\mathbf{+}}{\mathbf{w}}}$

• Case 1 → energy is added (+) to the system, w < 0 (-) since work is done by the system to surroundings (can expand):
• ΔE = 100 J + (-w)
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###### Problem Details

A gas is confined to a cylinder fitted with a piston and an electrical heater, as shown here:

Suppose that current is supplied to the heater so that 100 J of energy is added. Consider two different situations. In case (1) the piston is allowed to move as the energy is added. In case (2) the piston is fixed so that it cannot move.

In which case is E for the system (the gas in the cylinder) larger?