1.Two bricks are made of the same material, but brick 1 has half the volume of b
ID: 2139495 • Letter: 1
Question
1.Two bricks are made of the same material, but brick 1 has half the volume of brick 2.
Tthe two bricks have initial temperature of T1=30 degree and T2=60 degree, respectively.
They are placed next to each other and exchange heat.
What is the final equililbrium temperature?
Neglet heat losses to the environment.
2. Some ideal gas is placed in a cylinder equipped with a piston. The cylinder is placed in warm water in order to kep the temperature constant. You slowly push the piston to compress the gas. Are the change in internal energy, heat and work done on the gas positive, negative or zero?
3. Two bricks are made of aluminum and copper, respectively. They have the same number of atoms. which one required more heat for raising its temperature by 10K?
Explanation / Answer
3)
specific heat of Aluminum 900 J/kg C
specific heat of Copper 387 J/kg C
QAl = Mal * Cal *?T = 26.98 *900 *10 =242820
Qcu= Mcu * Ccu *?T = 63.55 *387*10 =245938.5
copper needs more heat
solution for 1 and 2 are in the way
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