A good thermometer is in thermal contact with system A and doesn\'t exchange ene

Question

A good thermometer is in thermal contact with system A and doesn't exchange energy with system A. And the same thermometer is then placed in thermal contact with system B and doesn't exchange energy with system B. Do we expect energy to flow from system A to system B if they are placed in thermal contact. Yes, it contacted A first No, A and B both have the same temperature as the thermometer Not enough information (energy might go to A or it might go from A) You have 10^20 molecules of gas in a 3d box with temperature T = 300K. Which is so cold the molecules can't rotate. What does the equipartition theorem say about the total energy? K E = 1/2 k_BT K E = 10^20 k_BT K E = 3/2 10^20 k_BT K E = 3k_BT None of the above Some heat flowed into a gas while the gas does some work. Does the temperature of the gas increase? Yes, heat flowed in No, work was done Not enough information Why does a boat float? The weight of the water displaced equals the weight of the boat The weight of the water displaced exceeds the weight of the boat The weight of the boat exceeds the weight of the water displaced

Explanation / Answer

Ans-2.5pts 5. (B) No, A and B both have the same temperature as the thermometer.

this is due to Zeroth law of thermodynamics which says if two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.

Ans-2.5pts 6. (C) K E =3/2*10^20*KBT

Because Equipartition predicts that the average total energy of an ideal gas of N particles is (3/2) NkBT.Where N=no of molecules.

Ans-2.5pts7. (A) yes heat flowed in

because when gas get heated its internal energy gets incresase therfore its temperature also incresases.

Ans-2.5pts8 (A) The weight of the water displaced equals the weight of the boat.

Because when boat flows at that time buoyancy force and its gavitational force equals each other and boat flows which is possible only when weight of the water displaced equals the weight of the boat.

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