n a running event, a sprinter does 5.5 105 J of work and her internal energy decreases by 8.8 105 J.

Question

(a) Determine the heat transferred between her body and surroundings during this event. _____J

(b) What does the sign of your answer to part (a) indicate? select one
(i)There is no heat transferred between the sprinter and the environment.
ii) Energy is transferred from the sprinter to the environment by heat.
iii)Energy is transferred from the environment to the sprinter by heat.

Answer 1

a) We can use the first law of thermodynamics, which relates work, internal energy, and heat transfer:

ΔU = Q - W

where ΔU is the change in internal energy, Q is the heat transferred, and W is the work done.

We want to solve for Q, so we'll rearrange the equation:

Q = ΔU + W

Now, plug in the values:

Q = -8.8 * 10^5 J + 5.5 * 10^5 J = -3.3 * 10^5 J

So, the heat transferred between her body and surroundings during this event is -3.3 * 10^5 J.

b) Since the sign of the heat transfer is negative, this means that energy is transferred from the sprinter to the environment by heat. So the correct answer is (ii).