Two identical spheres with same mass,radius and specific heat .one of them is kept on a perfectly insulating surface and other one is hung by a perfectly insulating string. Which one would require more heat to change its temperature by same degrees?
Answers
Because, if we see the surrounding, they are insulating in both cases and thus, there's no scope for thermal equilibrium. So, whatever heat we supply, in an isolated system, will be only received by the spheres, and the fact that they are identical ensures that there is equal ∆t
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One of the major effects of heat transfer is temperature change: heating increases the temperature while cooling decreases it. We assume that there is no phase change and that no work is done on or by the system. Experiments show that the transferred heat depends on three factors—the change in temperature, the mass of the system, and the substance and phase of the substance.
The heat Q transferred to cause a temperature change depends on the magnitude of the temperature change, the mass of the system, and the substance and phase involved. (a) The amount of heat transferred is directly proportional to the temperature change. To double the temperature change of a mass m, you need to add twice the heat. (b) The amount of heat transferred is also directly proportional to the mass. To cause an equivalent temperature change in a doubled mass, you need to add twice the heat. (c) The amount of heat transferred depends on the substance and its phase. If it takes an amount Q of heat to cause a temperature change \text{Δ}T in a given mass of copper, it will take 10.8 times that amount of heat to cause the equivalent temperature change in the same mass of water assuming no phase change in either substance.