Question

1. a student has a large pool full of water at 22°c and a small bucket of water also at 22°c. which system has more total thermal energy? explain. they will both have the same amount of thermal energy because its the temperature b. which system has (on average) faster moving particles? explain. the large pool because its bigger which means more particles 6. which would feel warmer to the touch - a bucket of water at 50°c or a bathtub filled with water at 25°c? or would they feel the same? explain your answer a bucket of water at 50°c because its a smaller object (lower energy) and is higher temperature b. which of these stores more thermal energy? or are they the same? explain. 7. explain why putting a glass jar with a tightly sealed metal lid under hot water makes it easier to remove the lid from the jar:

Explanation:

4a.

Thermal energy depends on mass, specific - heat capacity, and temperature. Since both have the same temperature and specific - heat capacity (same substance, water), and the pool has more mass, the pool has more thermal energy.
The pool has more total thermal energy because it has a greater mass of water while the temperature is the same for both.

4b.

Temperature is a measure of the average kinetic energy of particles. Since both the pool and the bucket have the same temperature ($22^{\circ}C$), the average speed of the particles is the same in both.
They have the same average - speed of particles because they have the same temperature.

6a.

The bucket of water at $50^{\circ}C$ will feel warmer to the touch because our perception of warmth is related to the temperature difference between the object and our skin. A higher - temperature object will transfer heat to our skin more quickly.
A bucket of water at $50^{\circ}C$ will feel warmer as it has a higher temperature.

6b.

Thermal energy $Q = mc\Delta T$. The bathtub has a much larger mass of water even though its temperature is lower. Since mass has a significant impact on thermal energy, the bathtub filled with water at $25^{\circ}C$ stores more thermal energy.
The bathtub filled with water at $25^{\circ}C$ stores more thermal energy due to its much larger mass.

7.

When the glass jar with a metal lid is put under hot water, the metal lid and the glass jar expand. However, metals generally expand more than glass for the same temperature increase. This creates a larger gap between the lid and the jar, making it easier to remove the lid.
The metal lid expands more than the glass jar when heated by hot water, creating a gap for easier removal.

Answer:

4a. The large pool has more total thermal energy.
4b. The average speed of particles is the same in both.
6a. A bucket of water at $50^{\circ}C$ will feel warmer.
6b. The bathtub filled with water at $25^{\circ}C$ stores more thermal energy.

1. The metal lid expands more than the glass jar when heated by hot water, creating a gap for easier removal.