Explanation Given data: M car = 1200 kg , v = 60 mph and M disk = 4.0 kg . Formula used: Write the another expression for heat energy needed to boil ( Q ) . Q = M c Δ T (1) Here, M is the mass, c is the specific heat, and Δ T is the change in temperature. Write the expression for kinetic energy ( KE ) KE = 1 2 M v 2 (2) Here, v is the speed. Consider a conversion factor for miles per hour to miles per second. 1 m h = 0.447 m s . Explanation: Refer to TABLE 12.4 in the textbook for Specific heats of solids and liquids that is specific heat of iron is c = 449 J kg ⋅ K . Consider a conversion factor for miles per hour to miles per second. v = 60 m h = 60 ( 0.447 m s ) = 26.82 m s Modify equation (1) for four brakes of car. Q car = 4 M disk c Δ T Modify equation (2) for iron disks. KE = 1 2 M car v 2 Consider the kinetic energy equal to the heat going into four brakes

4th Edition

ISBN: 9780134899978

Author: Knight

Publisher: PEARSON

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Chapter 12, Problem 94GP

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To find: The temperature change in each disk, when the car stops.

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Chapter 12, Problem 93GP

Chapter 12, Problem 95GP

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