An ideal gas is made up of monatomic molecules, each of the same mass. All of th

Question

An ideal gas is made up of monatomic molecules, each of the same mass. All of the following statements about this gas are true EXCEPT (A) The temperature of the gas is proportional to the average kinetic energy of the molecules. (B) All of the molecules have the same speed. (C) The molecules make elastic collisions with the walls of the container. (D) The molecules make elastic collisions with each other. Two objects with different sizes, masses, and temperatures are placed in thermal contact. Energy travels (A) from the larger object to the smaller object. (B) from the object with more mass to the one with less mass. (C) from the object at higher temperature to the object at lower temperature. (D) from the densest object to the least dense object. The specific heat of a liquid is 1000 J/(kg middot K). How much heat is needed to raise the temperature of 4 kg of this liquid from 10 degree C and 15 degree C? (A) 40,000 J (B) 60,000 J (c) 10,000 J (D) 20,000 J A 1 kg sample of copper at 300 degree C is dropped into a Styrofoam cup containing 0.5 kg of water at 30 degree C water. Assuming no heat transfer with the environment, what is the temperature of the combination at equilibrium? (use c_water = 4200 J/kg middot K, C_copper = 420 J/kg middot K) (A) 30 degree C (B) 75 degree C (C) 100 degree C (D) 300 degree C Assuming that the coefficient of linear expansion of a metal bar is the same from 0 degree C to 50 degree C, which of the following temperature changes will produce the largest percent increase in the length of a metal bar? (select 2 answers). (A) An increase in temperature from 18 degree C to 22 degree C (B) An increase in temperature from 30 degree C to 31 degree C (C) An increase in temperature from 296 K to 300 K (D) A decrease in temperature from 52 degree C to 42 degree C

Explanation / Answer

1) correct option is (B)

2) correct option is (C)

3) Cp = 1000 J/kg.oC, m = 4 kg

Q = mCp*DT

Q = 4*1000*(15-10) = 20000 J

correct option is (D)

4) heat gain by water = heat lost by copper

(0.5*4200*(T-30)) = -(1*420*(T -300))

T = 75 oC

correct option is (B)

5) coefficient of linea expansion alpha = DL/L*DT

for (A) and (C) options DT = 22-18 = 4 oC

correct options are (A) and (C)

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