Question

PLEASE HELP ME :)

Answer 1

A) 350 J

- The initial internal energy of the cup is

$U_i = 230 J$

- The final internal energy of the cup is

$U_f = 580 J$

According to the first law of thermodynamics:

$U_f - U_i = Q+W$

where

Q is the heat absorbed by the system

W is the work done on the system

The work done on the system in this case is 0, so we can rewrite the equation as

$U_f - U_i = Q$

And so we find the heat transferred

$Q=580 J - 230 J=350 J$

B) IN the cup

Explanation:

in this situation, we see that the internal energy of the cup increases. The internal energy of an object/substance is proportional to its temperature, so it is a measure of the average kinetic energy of the molecules of the object/substance. Therefore, in this case, the temperature (and the energy of the molecules of the substance) has increased: this means that heat has been transferred INTO the system from the environment (the heat came from the sun).