Quiz 6 - Heat, Work, and Energy

1. How does heat and work affect a system?

• A. Heat and work both contribute to the total internal energy of a system.

• B. Without heat and work, there will be no internal energy of the system.

• C. Heat and work do not affect to the total internal energy of a system.

2. What happens to internal energy when heat transfer (Q) and work done (W) are equal?

• A. The internal energy is equal to the difference between heat and work, increases.

• B. The internal energy is equal to the sum of heat and work, decreases.

• C. The internal energy has no net charge or is not affected.

3. Heat is added to our body by metabolizing food, and our body does work. If we return to THE SAME STATE at the end of the day, describe the work and heat of our body

• A. The amount of heat is equal to the work done.

• B. Internal energy will decrease.

• C. Work done is greater than the heat added.

4. A balloon filled with gas is placed in the sun and the gas inside it heats up. As the gas heats up, the balloon expands. How does HEAT AFFECT THE INTERNAL ENERGY of the gas inside the balloon?

• A. The internal energy of the gas decreases as the gas cools down and the volume decreases.

• B. The internal energy of the gas increases as the gas molecules move faster due to the increase in temperature.

• C. The internal energy of the gas stays constant because the balloon's expansion does not affect the gas temperature

5. A hot water bottle is filled with a hot water and placed under a blanket to warm up a person on a cold night. Over time, the water inside the BOTTLE COOLS DOWN, and the BLANKET BECOMES WARMER. How does the internal energy of the water in the bottle change as it cools?

• A. The internal energy of the water decreases because heat is transferred from the water to the surroundings.

• B. The internal energy of the water remains constant because the temperature of the water does not change.

• C. The internal energy of the water increases because heat flows into the water from the blanket.