1. to make a secure fit, rivets that are larger than the rivet hole are often used and the rivet is cooled (usually in dry ice) before it is placed in the hole. a steel rivet 1.871 cm in diameter is to be placed in a hole 1.869 cm in diameter at 20 degree celcius. to what temperature must the rivet be cooled if it is to fit in the hole?

2. you wish to determine the specific heat of a new metal alloy. A 0.150 kg sample of the alloy is heated to 540 degree C. it is then quickly placed in 400 g of water at 10 degree C which is contained in a 200 g aluminum calorimeter cup. the final temp. of the system is 30.5 degree C. calculate the specific heat of the alloy. (Cwater = 4186 J/kgoC);Ccup=900 J/kgoC))

for number 1, is the answer negative?
For number 2, how do we solve it without the Calloy?

1. 1, Yes
2. You are looking for Calloy, that is your unknown.

posted by bobpursley

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