Question

An open system starts with 52 J of mechanical energy. The energy changes

to 45 J of mechanical energy and 2 J of thermal energy. What is the final total
energy of the system?
A. 9J
B. 47 J
C. 50 J
D. 54 J

Answer 1

The final total energy of the open system, which originally has 52 J of mechanical energy and then changes to 45 J of mechanical energy and 2 J of thermal energy, is calculated to be 47 J.

Step-by-step explanation:

The question relates to the concept of energy conservation in an open system in physics. If the system starts with 52 J of mechanical energy and changes to 45 J of mechanical energy and 2 J of thermal energy, the final total energy of the system can be calculated by adding up all forms of energy after the change. This would result in:

Final mechanical energy = 45 J
Final thermal energy = 2 J

Final total energy = Final mechanical energy + Final thermal energy = 45 J + 2 J

Therefore, the final total energy is:

47 J (Answer B).