Question

2.1.4 quiz: conservation of energy

question 3 of 10

how could you decrease the total energy of a system consisting of a jar full of water?

a. place the jar in sunlight.

b. place the jar in a freezer.

c. heat the jar in a microwave oven.

d. place a lid on the jar and shake it.

Explanation:

To decrease the total energy of a system (jar of water), we need to remove energy (heat). Placing the jar in sunlight (A) or heating it (C) adds energy. Shaking (D) adds kinetic energy. A freezer (B) removes heat, decreasing the water's thermal energy, thus total energy of the system.

Answer:

B. Place the jar in a freezer.