COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 14, Problem 55QAP
To determine
Derive a formula for converting from °C to °F starting from
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The temperature difference between the hot and cold fluids in a heat exchanger is given to be DT1 at one end and DT2 at the other end. Can the logarithmic temperature difference DTlm of this heat exchanger be greater than both DT1 and DT2? Explain.
A gold wire 2.4 m long has its temperature lowered by 42oC. Assuming the linear coefficient of expansion has a constant value of 13 x 10-6 K-1 over that temperature range, calculate the change in length of the wire. Express your answer in mm.
Calculate ΔG when supercooled water at –3oC freezes at constant P and T. The vapor pressure of ice at –3oC is 475 Pa, and the vapor pressure of supercooled water at –3oC is 489 Pa.
Answer: - 65.2
Chapter 14 Solutions
COLLEGE PHYSICS
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- During the summer after your first year at Carnegie Mellon, you are lucky enough to get a job making coffee at Starbucks, but you tell your parents and friends that you have secured a lucrative position as a "java engineer." An eccentric chemistry professor (not mentioning any names) stops in every day and orders 200ml of Sumatran coffee at precisely 70.0°C. You then need to add enough milk at 5.00°C to drop the temperature of the coffee, initially at 80.0°C, to the ordered temperature. Calculate the amount of milk (in ml) you must add to reach this temperature. Show all your work in the provided spaces. In order to simplify the calculations, you will start by assuming that milk and coffee have the specific heat and density as if water. In the following parts, you will remove these simplifications. Solve now this problem assuming the density is 1.000 g/ml for milk and coffee and their specific heat capacity is 4.184 J/(g ºC).arrow_forwardCan you determine the temperature of a vacuum? Explainarrow_forwardTwo finned surfaces are identical, except that the convection heat transfer coefficient of one of them is twice that of the other. For which finned surface is the (a) fin effectiveness and (b) fin efficiency higher? Explain.arrow_forward
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