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 molecule 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? KE =1/2 k_B T KE = 10^20 k_B T KE = 3/2 10^20 k_B T KE = 3k_B T 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 So, 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

from the Zeroth law of thermo dynamics if A and B at same temperature and B and C at same temeperature then A and C is also at same tempertature

there is no energy exchange between the system A and thermometer ,A and thermometer have same temperature simillarly ,there is no energy exchange between the system B and thermometer,B and thermometer have same temperature . so A and B have same temperature

option (B) is correct answer

(b)

(c) is correct answer

(c)

from the first law of thermodynamics

del Q = delU + del W

the amount of heat given system is equal to change in its internal energy and work done

option (B) is correct

(d)

A huge boat, will float because, even though it weighs a lot, it displaces a huge amount of water that weighs even more. Plus, boats are designed specifically so that they will displace enough water to assure that they’ll float easily.

option (A) is correct answer

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