Omer Moter PHYS 2425 EXAM 2 KCHU PHYS 2326 Spring 2013 (8) The internal energy o

Question

Omer Moter PHYS 2425 EXAM 2 KCHU PHYS 2326 Spring 2013 (8) The internal energy of an ideal gas is changed by adding heat Q to the system and also by doing work Won the gas. What is the change in internal energy of the gas? (a) Q+W (b) 4.186Q-W (c) a-W (d) Q-4.186W (e) W-q (9) What type of energies can make up the internal energy of a diatomic gas? (a) rotational kinetic energy (b) vibrational kinetic energy (b) translational kinetic energy (d) all of the preceding (10)A 400-g piece of metal at 100°C is dropped into a cup containing 450 g of water at 15.0°C. The final temperature of the system is 40.0°C. What is the specific heat of the metal, assuming no heat is exchanged with the surroundings or the cup? (a) 1960 J/(kg-K) (d) 3780 J/(kg-K) (c) 3420 J/(kg.K) (b) 2830 J/(kg.K) (e) 4280 J/(kg.K) Free Recnnnee

Explanation / Answer

8.

Result : (c)

Explanation:

We know that , dQ = dU +d W

Change in internal energy is given by :

dU = Q- W

9.

Result: (d)

Explanation:

We know that , Internal energy is a combination of all the microscopic energies such as translation, rotational and vibrational kinetic energy.

10.

Result : (a)

We know that :

Qlost = Qgain

(0.4 kg)*(cp)*(373 - 313) = (0.45 kg)*(4185.5 J/kg-k)*(313-288)

Cp ~ 1960 J/kg-k

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