Question

The air in a car tire la compressed when the car rolls over a rock. If the air

outside the tire becomes slightly warmer, what are the correct signs of heat

and work for this change?

Answer 1

the signs of heat and work are; -Q and -W

Step-by-step explanation:

The first law of thermodynamics is given by; ΔU = Q − W

where;

ΔU is the change in internal energy of a system,

Q is the net heat transfer (the sum of all heat transfer into and out of the system)

W is the net work done (the sum of all work done on or by the system).

Now, The system in this case is the tire and since the air gets warmer, heat must have left the system. Therefore Q is negative (-Q).

Since work is done by the system, W remains negative.

Thus, the signs of heat and work are; -Q and - W