1. You know that the heat lost by a hotter material equals the heat gained by th

Question

1. You know that the heat lost by a hotter material equals the heat gained by the colder material when the two materials are combined. However, based on your observations, would combining equal masses of water and metal at different initial temps produce equal but opposite temperature changes in each? explain

2. suppose you have equal masses of water and copper nails at the same temperature. If you place both the water and the copper nails over identical flames for the same amount of time, would one material change temperature more than the other? If so which material would reach a higher temperature, why?

3. Suppose you had cold feet when you went to bed and you wanted something to warm your feet. In the old days people would use a hot water bottle filled with hot water as opposed to any of the metal samples we studied today. Why? If on the other hand you had to choose one of the metal samples we studied today which would u choose? Why? samples used were tin, copper, aluminum and zinc

Explanation / Answer

heat Q = m * s * delT

s = specific heat of the substance

1    when both water and metal are kept together the heat transfered by hot body is gained by cold body .they will reach a final temperature but will not have a same change in temperature because the specific heats are different . As Q is constant So temperature change will be different.

2     Substance       c in J/gm K

       Copper              0.386

      Water               4.179

      as heat given is same ,so specific heat of water is more than specific heat of copper therefore change in temperature of water will be less when compared to copper .

so temperature rise in copper will be more

3          Substance       c in J/gm K

       Copper              0.386

        Aluminum             0.900

            tin                       0.217

            zinc                      0.388

heat given by the feet = heat taken by the metal

people use water because temperature change in water will be less and we will feel warm for longer time

so when considered to metals specific heat of aluminium is more than all the other mentioned so it is used now a days.

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