Question

An automobile engine provides 568 Joules of work to push the pistons.
In this process the internal energy changes by -2778 Joules.

Calculate q for the engine. The represents the amount of heat that must be carried away by the cooling system.

Answer 1

Answer on Question #58645, Physics / Molecular Physics | Thermodynamics

Task. An automobile engine provides 568 Joules of work to push the pistons. In this process the internal energy changes by -2778 Joules. Calculate q for the engine. The represents the amount of heat that must be carried away by the cooling system.

Solution

From $2^{\mathrm{nd}}$ thermodynamics law:

$$\delta Q = d U + \delta A$$

Where $\delta Q$ – change in heat, given to or taken away from system

$\delta A$ – work done by or on system

$dU$ – change in internal energy

$\delta Q = -2778 + 568 = -2210$ Joules

Answer

$$\delta Q = -2210 \text{ Joules}$$

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