GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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All variables should be kept constant while gradually changing the mass.
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Mass should be kept constant while the amount of water is gradually increased.
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The hot material should be changed in every trial while keeping the initial temperature constant.
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Temperature of the water, at the instant the hot material is submerged, should be recorded as the final equilibrium temperature.
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Detailed explanation-1: -The quantitative relationship between heat transfer and temperature change contains all three factors: Q = mcT, where Q is the symbol for heat transfer, m is the mass of the substance, and T is the change in temperature. The symbol c stands for specific heat and depends on the material and phase.
Detailed explanation-2: -The mass m, specific heat c, change in temperature T, and heat added (or subtracted) Q are related by the equation: Q=mcT.
Detailed explanation-3: -The units on the rate of heat transfer are Joule/second, also known as a Watt.
Detailed explanation-4: -(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.