Physics Quiz On Heat And Temperature!

Explanation
When a material is heated, the total internal energy of the substance will be increased. Heating a material causes the molecules within it to gain kinetic energy, resulting in increased movement and vibration of the molecules. This increased molecular motion leads to a higher internal energy for the substance.

Explanation
When hot water is added to the pail containing water at a lower temperature, heat is transferred from the hot water to the cooler water. The amount of heat transferred can be calculated using the equation Q = mcΔT, where Q is the heat transferred, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature. Since the specific heat capacity of water is constant, the heat transferred is directly proportional to the change in temperature. In this case, 10 liters of hot water at 80 degrees Celsius is added to 30 liters of water at 20 degrees Celsius. The total mass of the water is 40 liters, and the change in temperature is 80 - 20 = 60 degrees Celsius. Therefore, the final temperature of the water in the pail will be (60/40) * 10 + 20 = 35 degrees Celsius.

Explanation
Use the Q = mcθ.

Explanation
Use Boyle's Law.

Explanation
Use Gay-Lussac's Law or simply the Pressure Law.

Explanation
Use Boyle's Law.

Explanation
Use Gay-Lussac's Law or simply the Pressure Law.

Explanation
Conduction is the correct answer because it refers to the process of heat transfer between objects that are in direct contact with each other. In conduction, heat energy is transferred through the collision of particles within the objects, causing the hotter object to transfer heat to the cooler object until they reach thermal equilibrium.

Explanation
As a substance gets cooler, the kinetic energy of its molecules decreases. This causes the molecules to move slower. When the molecules move slower, they have less energy to overcome intermolecular forces, which results in a decrease in the overall movement and vibration of the molecules. Therefore, the correct answer is that the molecules move slower as the substance gets cooler.

Explanation
Radiation is responsible for bringing heat to our planet. Radiation is the transfer of energy through electromagnetic waves, such as heat from the Sun reaching the Earth. Unlike conduction and convection, which require a medium to transfer heat, radiation can occur through empty space. Therefore, radiation is the primary mechanism by which heat is transferred from the Sun to the Earth, making it responsible for bringing heat to our planet.