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Chapter 10: Q.39 (page 257)

How much work is done by the environment in the process shown inFIGUREEX10.39? Is energy transferred from the environment to the system or from the system to the environment?

Short Answer

Expert verified

The work done by the environment= -1J.

Step by step solution

01

Kinetic energy : Given information

Initial kinetic energy, Ki=4J

Initial potential energy, Ui=1J

Final potential energy, Uf=2J

Final kinetic energy,Kf=1J

Final thermal energy,鈭�Eth=1J

The work that an object can perform as a result of its mobility is measured by its kinetic energy.

02

Explanation :

The entire energy in any process is always conserved, according to the law of energy conservation. As a result, the process's final kinetic energy is computed as

Ki+Ui+Wext=Kf+Uf+鈭�Eth

Substituting the values from the energy bar chart given,

4+1+Wext=1+2+1Wext=-1J

Hence, work done by the environment is-1J.

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Most popular questions from this chapter

A freight company uses a compressed spring to shoot 2.0kgpackages up a -high frictionless ramp into a truck, as FIGURE P10.51shows. The spring constant is 500N/mand the spring is compressed 30cm.

a. What is the speed of the package when it reaches the truck?

b. A careless worker spills his soda on the ramp. This creates a 50-cm-long sticky spot with a coefficient of kinetic friction 0.30. Will the next package make it into the truck?

What is the final kinetic energy of the system for the process shown in FIGUREEX10.38?

A process occurs in which a system鈥檚 potential energy decreases while the system does work on the environment. Does the system鈥檚 kinetic energy increase, decrease, or stay the same? Or is there not enough information to tell? Explain.

a. A 50gice cube can slide without friction up and down a 30oslope. The ice cube is pressed against a spring at the bottom of the slope, compressing the spring 10cm. The spring constant is 25N/m. When the ice cube is released, what total distance will it travel up the slope before reversing direction?

b. The ice cube is replaced by a 50gplastic cube whose coefficient of kinetic friction is 0.20. How far will the plastic cube travel up the slope? Use work and energy.

A sled starts from rest at the top of the frictionless, hemispherical, snow-covered hill shown in FIGURE CP10.74.

a. Find an expression for the sled鈥檚 speed when it is at angle 蠒.

b. Use Newton鈥檚 laws to find the maximum speed the sled can have at angle 蠒without leaving the surface.

c. At what angle 蠒maxdoes the sled 鈥渇ly off鈥� the hill?
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