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Construct Your Own ProblemConsider a new model of commercial airplane having its brakes tested as a part of the initial flight permission procedure. The airplane is brought to takeoff speed and then stopped with the brakes alone. Construct a problem in which you calculate the temperature increase of the brakes duringthis process. You may assume most of the kinetic energy of the airplane is converted to thermal energy in the brakes and surrounding materials, and that little escapes. Note that the brakes are expected to become so hot in this procedure that they ignite and, in order to pass the test, the airplane must be able to withstand the fire for some time without a general conflagration.

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Physics 101 Mechanics

Chapter 14

Heat and Heat Transfer Methods

Thermal Properties of Matter

Rutgers, The State University of New Jersey

University of Washington

University of Sheffield

Lectures

02:20

A solid, liquid, or gas is…

06:13

Matter is a state of aggre…

01:38

Construct Your Own Problem…

02:32

Proper design of automobil…

08:48

01:21

03:31

An automobile has a mass o…

04:19

05:24

02:57

01:46

When a driver brakes an au…

08:52

08:20

Here is a clever idea. Sup…

02:28

Consider an amusement park…

03:38

Consult Multiple-Concept E…

06:18

A car with mass $1275 \mat…

00:45

The brake shoe and steel d…

02:53

A gun is a heat engine. In…

03:54

Truck brakes can fail if t…

06:50

Consider a well-insulated …

05:55

01:51

So this is problem. 18 chapter 15. And so for a perfect heat engine, our ratio off Q c o ver que h It's gonna be equal to the ratio of the absolute temperatures of the heat reservoirs. And so our engine this is gonna be equal to T C over T H on Dhere QC is the heat taken from the system, whereas Q h is the heat put into the system? Uh, T C is the temperature of the cold reservoir and T H is the temperature of the popular support. Because of this, the maximum efficiency which will call E f f c is going to be given by this equation one minus TC over T h and th and T c are in Kellman. And, uh, you know, as you know, this is gonna be our efficiency. So f th and T c are given. We can go ahead and calculate the maximum efficiency using this formula. So Hee F F C is equal to one minus t c over t h like earlier and then we know from research. Modern gasoline engines have a maximum thermal efficiency about of about 25 percent to 30%. And so using this, you can go ahead and construct a problem

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