F3 Physics 問題

(1) Why heat capacity of water may not be greater than that of aluminium?Because Al is a solid metal.
(2) Why if two bodies are of same temperature, they may not carry same amount of heat energy?Because they have different heat capcities or different weights.
(3) Why if two metal blocks of different temperatures are brought in contact with each other, some of the molecules in the hotter block won't move to the colder block?They only move heat energy but do not move molecules.
(4) Two blocks of same material of mass 2M and M at temperatures T and 4T are put into contact. After a long time, which of the following statements is correct?1.their total internal energies are the same=(X):2MT=\=4MT
2.their heat capacities ae the same=(O):same material
3.their temperatures are the same=(O):2T(5) When 1 kg of ice at zero and 1 kg of steam at 100 degree C is mixed together, the mixture is1.2 kg of ice at zero
2.ice and water coexisting together
3.warm water only
4.water and steam coexisting togetherVapor heat=539(kcal/kg)Melting heat=79.7(kcal/kg)539-79.9-100=359.3(kcal/kg)steam=359.3/539=0.3333(kg)water=1-0.3333=0.6666(kg)ans=(4)coexisting together

1. You need to consider the mass of water and aluminium. It may happen that the mass of aluminium is much larger than that of water.

2. The inernal energy of an object depends very much on the number of molecules possessed by the object. If two objects are at the same temperature, the one with larger number of molecules possesses a greater amount of internal energy.

3. Molecules in a metallic block are bound by strong intermolecular force. What is transmitted from the hot block to the cold block is the vibrational energy of the molecules, but not the molecules themselves.

4. Statement 3 is true.

5. Statement 4 is true.