thermal equilibrium

February 4, 2016

QUESTION 1

A 75 kg block of copper is at room temperature of 140º C. It is then dropped into an isolated bucket containing 25 kg of water that is at 30º C.?

A. The change in temperature will be __________?for the copper and _______?for the water (positive/negative/same)?

B. Q will be_______?for the copper and _________?for the water. (positive/negative/same)?

C. Which is greater: the energy lost by the copper or the energy gained by the water? ________?(copper/water/equal)?

D. What do you know about the Tf of the copper compared to the Tf for the water? They should be _________?(higher/lower/equal)?

E. Solve for the final temperature __________ºC. (round to TWO decimals)??????

25 points

QUESTION 2

60 kg of aluminum at 15º C is placed into 20 kg of 90º C water. If no heat is exchanged with the surroundings, find the final temperature of the two. ____________ºC (Round your answers to two decimals)??????

25 points

QUESTION 3

A 120 kg piece of iron originally at 250ºC is put into an insulated bucket with 85 kg of water. If they equalize at 62ºC, what was the original temperature of the water? _______ºC??????

25 points

QUESTION 4

A 5 kg piece of aluminum at 150ºC is at thermal equilibrium with an 18 kg piece of gold. Both are dropped into a bucket of 5º water. If the final temperature of the water ends up being 8.5ºC, how much water was in the bucket? ______________kg.??????

25 points

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