Document 9-3 PHYSICS- Temperature&Heat; Formula Homework Assignment Name: Heat F

Question

Document 9-3 PHYSICS- Temperature&Heat; Formula Homework Assignment Name: Heat Formula Q is the heat added or taken out (in calories), m is the mass (in g), AT is the change in temperature (in·C), Caution: The change in temperature is not the final temperature. The change in temperature is AT T-T (1) How much heat must be added to 200 g of gold to raise its temperature from 20°C to 180C? [For gold 031 cal gC). (2) What will be the final temperature of 150 g of 40 C iron if 1800 cal are added to it[For iron.12 calg C). (3) A glass containing 500 g of water is placed in the freezer. The water's temperature changes from 35'C to 5'C. Calculate the heat Q associated with this change in temperature. [For water,c-1 calg C 4) Equal amounts of heat are added to equal amounts of copper [cI calgC)] and aluminum [c-2calg C)]. Which metal gets warmer as a result?Briefly explain why. (5) Calculate the two missing temperatures (show your work in the space provided). highest outdoor temperature ever recorded (in Death Valley, California) 134 F 2 C ? K

Explanation / Answer

1.

Q = m*C*dT

for gold C = 0.031 cal/gm-C

m = 200 gm

dT = 180 - 20 = 160 C

So,

Q = 200*0.031*160 = 992 cal

2.

Q = m*C*(Tf - Ti)

Tf - Ti = Q/(m*C)

Tf = Ti + Q/m*C

Using given values

Tf = 40 + 1800/(150*0.12)

Tf = 140 C

3.

Q = m*C*dT

m = 500 gm

C = 1/cal/g-C

dT = 5 - 35 = -30 C

Q = 500*1*(-30) = -15000 cal

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