Question

In a heat engine, 700 J of heat enters the system, and the piston does 400 J of work. What is the final internal (thermal) energy of the system if the initial energy is 1200 J? 300 J 900 J 1100 J 1500 J.

Answer 1

Answer: The answer would be: 1500 J

Explanation:

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Answer 2

The first law of thermodynamics characterises the two types of energy transfer, as heat and as thermodynamic. The final internal (thermal) energy of the system is 1,500 J.

What is internal energy?

The energy present in a system itself for conducting reactions is called internal energy.

Given,

• Heat entering system (Q) = 700 J
• Work done by the piston (W) = 400
• Initial energy $(\rm U_{1})$= 1200 J

According to the first law of thermodynamics:

$\rm Q = \Delta U + W$

Substituting values in the above equation:

$\begin{aligned}\rm Q &= \rm U_{2} - U_{1} + W\\\\\rm U_{2} &= \rm Q - W + U_{1}\\\\\rm U_{2} &= 700 - 400 + 1200\\\\&= 1500 \;\rm J\end{aligned}$

Therefore, option D. 1500 J is the final energy.

Learn more about internal energy here:

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