Question

An automobile engine provides 631 Joules of work to push the pistons.In this process the internal energy changes by -2881 Joules.Calculate q for the engine. This represents the amount of heat that must be carried away by the cooling system.

Answer 1

q = - 2250 Joules

Step-by-step explanation:

work, w = 631 joules

internal energy ΔU = -2881 joules

q = ?

The relationship between work, internal energy and q is given by the equation;

q + w = ΔU

Since work is done by the automobile energy, it would have a negative sign, hence;

ΔU = q - w

Inserting the values and solving for q;

ΔU + w = q

q = -2881 + 631

q = - 2250 Joules