Thermal Transformation: Conduction, Convection and Radiation

1#

96.05: When metal rod 1 is placed in contact with metal rod 2, thermal enkxm,/e3 ga rj*sm8hh; ergy flows from 1 to 2. A possible explanation is that 1 has a higher __,em/g3mhj has x*8;kr__ than 2

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.27: A frozen hamburger ino az91h7 lh5lvmeno 42 plastic needs to be thawed quickly. Which of the methods described provides the most rapid thawing of the burgen 2 vo9aeo7z41lhlh 5mr?

A. Place the burger itself in a metal pan at room temperature.

B. Place the burger in its package on the kitchen counter at room temperature.

C. Place the burger in its package in a pot of non-boiling warm water.

D. Place the burger itself on a plastic plate in the refrigerator.

E. Place the burger itself on the ceramic kitchen counter at room temperature.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

07.45: If the temperature of a material doublnndy5gtk62 inj 550t mes on the Kelvin scale, by how much does the time-rate at which energy is radiated from the material c6yt 5gnkd50nt mi 5jn2hange?

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

09.19: A scientist cla8wnc a,zeq,*fims to be investigating “The transfer of energy that results from the bulk motion of a fluid.” Which of* ,ac,fez nw8q the following terms best describes the energy transfer method that this scientist is studying?

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

10.41/18.50: Two spheres are heated to the n ng)ir33jw. dsame temperature and allowed to radiate energy to identical surroundings. The spheres have the sangiwd j3rn.)3me emissivity, but one sphere has twice the diameter of the other. If the smaller sphere radiates energy at a rate P, at what rate will the larger sphere radiate energy?

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

08.22: In a calorimeter, 20 grav2sra,,kqj3z ms of liquid water at $100^{\circ}C$ is mixed with 50 grams of water vapor at $100^{\circ}C$. The system is allowed to come to equilibrium. Assuming that the calorimeter and the surroundings can be ignored, which of the following best describes the net energy exchange between the vapor and the liquid during the process of coming to equilibrium?

A. There is no net energy exchange.

B. Energy is transferred from the vapor to the liquid, vaporizing some of the liquid

C. Energy is transferred from the vapor to the liquid, increasing the liquid’s temperature.

D. Energy is transferred from the vapor to the liquid until all of the liquid vaporizes.

E. Energy is transferred from the liquid to the vapor, condensing some vapor

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