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Chapter 19: Q. 2 (page 543)

How much work is done on the gas in the process shown in Figure EX19.2?

Short Answer

Expert verified

The amount of work done energy is 60J

Step by step solution

01

Definition of work done

The work done has represented as energy that is transferred between system and environment.

02

Finding the work done energy.

A the energy is transferred from gas to environment the work done is negative in the area of graph.

The area of the triangle is

=12∆V×∆p=12×(Vf-Vi)(∆p)=12×(100×10-6-300×10-6)m3(400×103-200×103)Pa=-20J

The area of rectangular is


=∆V×∆p=(Vf-Vi)(∆p)=(100×10-6-300×10-6)m3(200×103-0×103)Pa=-40J

So, the total work done is the sum of triangle and rectangular (-20J-40J)=-60J

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Most popular questions from this chapter

51. A 560kg concrete table needs to be supported at the four corners by compressed-air cylinders. Each cylinder is 25cm in diameter and has a 1.20m initial length when the pressure inside is 1.0atm. A hoist lowers the table very slowly, compressing the cylinders while allowing them to stay in thermal equilibrium with their surroundings. How much work has been done on the gas of the four cylinders when the table reaches its equilibrium position?

A monatomic gas fills the left end of the cylinder in FIGURE CP19.82. At 300K,the gas cylinder length is 10.0cmand the spring is compressed by 2.0cm. How much heat energy must be added to the gas to expand the cylinder length to 16.0cm?

A 150 L 1≈40 gal2 electric hot-water tank has a 5.0 kW heater.

How many minutes will it take to raise the water temperature from 65°F to 140°F?

w

One way you keep from overheating is by perspiring.

Evaporation—a phase change—requires heat, and the heat energy

is removed from your body. Evaporation is much like boiling,

only water’s heat of vaporization at 350Cis a somewhat larger

24×105J/kgBecause at lower temperatures, more energy is required.

to break the molecular bonds. Very strenuous activity can

This causes an adult human to produce 30 g of perspiration per minute.

If all the perspiration evaporates, rather than drips off, at what

rate (in J/s) is it possible to exhaust heat by perspiring?
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