A 30 g ice cube at -1 degree C is dropped into 200 g of water at 30 degree C. Wh

Question

A 30 g ice cube at -1 degree C is dropped into 200 g of water at 30 degree C. What is the temperature of the mixture? (The Heat of fusion of ice is 3.4 times 10^5 1/kg and specific heat capacity of water 4190 1/kg times degree C, specific heat capacity of ice is 2108 J/kg times degree C). When water at 4 degree C is heated it expands. When water at 4 degree C is cooled, it contracts. expands. neither contracts not expands. In an isobaric expansion of an ideal gas, no heat flows into the gas. the internal energy of the gas remains constant. no work is done on the gas. work is done on the gas. work is done by the gas. When two gases are mixed, if they are to be in thermal equilibrium, they may not necessarily have the same volume pressure molecular mass kinetic energy average speed neither of these. A grandfather clock, accurate at 20 degree C. runs fast on a hot day (30 degree C). runs slow on a hot day(30 degree C). The clock uses a pendulum supported on a long thin brass rod.

Explanation / Answer

9)

Let the final temperature be T..

T = [ 30 * 1 * (-1) + 200 * 1 * 30 - 30 * 80] / (200 + 30)
   = 3570 / 230 = 15.52° C

10)

4 degrees C turns out to be the temperature at which liquid water has the highest density. If you heat it or cool it, it will Expand. The expansion of water when you cool it to lower temperatures is unusual, since most liquids contract when they're cooled.

11) D

work is done on the gas

12)

Actually, they have the same average molecular kinetic energy. If the two gases have different molecular weights, then then they won't have the same average speed; the more massive molecules will be moving slower than the lighter molecules

13)

Addition of heat = increase in temperature.
Increase in temperature ..increase in linear expansion of the pendulum rod i.e. it's longer.
Longer rod, longer swing..the clock will slow down a little.
It should correct itself overnight when it cools down.

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