Which of the following processes will increase the mass of the system?
A) A rock is made to move faster and faster.
B) Two magnets that are initially held together by their magnetic forces are separated.
C) Both of the above.
D) A cup of coffee is heated.
E) All of the above.

Question

Quizplus · Accepted Answer

All of the processes listed will increase the mass of the system. When a rock is made to move faster and faster, its mass increases due to the relativistic increase in mass. When two magnets that are initially held together by their magnetic forces are separated, the mass of the system increases due to the energy stored in the magnetic field. When a cup of coffee is heated, the mass of the system increases due to the increase in thermal energy.

Which of the Following Processes Will Increase the Mass of the System