If you heat a thin circular ring so that its temperature is twice what it was or

Question

If you heat a thin circular ring so that its temperature is twice what it was originally, the ring's hole A. becomes larger. B. becomes smaller by an unknown amount. C. remains the same size. D. becomes four times smaller E. becomes two times smaller. 5. (2 pointts) Two objects that are not initially in thermal equilibrium are placed in close contact. After a while, (assuming that negligible heat is lost from the system) A. the specific heats of both objects will be equal. B. the thermal conductivity of each object will be the same. C. the temperature of the cooler object will rise the same amount that the hotter one drops. D. the amount of energy that the hotter object gives off will be the same as the amount that the cooler one gains. E. the temperature of the cooler object will rise twice as mu Ch as the temperature of the hotter one drops.

Explanation / Answer

(4) When temperature increases its area also increase becuase of thermal expnasion

as the total size of ring increases its hole size will also increase and it become larger.

So option A is correct!

(5) When two object of different temperature make contact then heat flow from hotter object to the cooler one and this heat will flow until their temperature become same and they come in thermal equilibrium.

It is not always true that the change in temperature will be same for both because one object can be large and other can be small

So the amount of energy that the hotter object gives off will be the same as the amount that the coller one gains

Hence option D is correct!

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