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 2
An ideal spring has a spring constant (force constant) of 60 N/m. How much energy does it store when it is stretched by 1.0 cm?
A) 0.30 J B) 60 J C) 0.0030 J D) 600 J