Internal energy and r.m.s. speed - 无忧得胜-网上国际课程 (5edu.win)

1#

97.26: The average speed of the atoms of a gas at 100 K is 200 m/s. What x sfrpfnp. 3tt46-o40m kdlkf d:t 6o8would most nearly b f4kt0 6f4o p-fd8.pnsxt :mdt3or6lke the average speed of the atoms at 300 K?

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

01.29: A 200 gram sample of copper is submerged in 100 grams /ue);qz ,px1)0 /uhdnfb2 jh2gkwka cof water until both the copper and water are at the same temperature. Which of the fo nkwe/b/2fd0gp ,ah)k2c1 zuu j)hx;qllowing statements would be true.

A. the molecules of the water and copper would have equal average speeds

B. the molecules of the water and copper would have equal average momenta

C. the molecules of the water and copper would have equal average kinetic energies

D. the water molecules would have twice the average momentum of the copper molecules

E. the copper molecules would have twice the average speed of the water molecules

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

02.08: A gas is enclosed in a cylindrical piston. When the gagf obz/kg-c stx 6x0mt 2nk5*.s is heated from $0^{\circ}C$ to $100^{\circ}C$, the piston is allowed to move to maintain a constant pressure. According to the Kinetic-Molecular Theory of Matter

A. the mass of the gas will increase

B. the number of molecules of gas must increase

C. the size of the individual molecules has increased

D. the average speed of the molecules has increased

E. the molecules continue to strike the sides of the container with the same energy

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

03.21: According to the kinetic theory of gases, when the absolute temperatu5 ua/ *zo;xber 1ib/guw-i;vtre of an ideal gas doubles, the average kinetic energy of /;*x; /wuagb ir5-eubit1oz vthe molecules of the gas

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

04.23: If two molecules in a gas collide, thenj 05n,)x+0d/hbykm5 ap prbia

A. total momentum is always unchanged.

B. velocities are always exchanged

C. both molecules always speed up.

D. total kinetic energy always increases.

E. velocities are always unchanged.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

05.40: A new monatomic ideal:fs1 q iwf qu84q4ro0n gas is discovered and named “Physicsbowlium.” A pureuo 1fsqfni:r0 w4q48 q 4-mole sample is sitting in a container at equilibrium in a $20.0^{\circ}C$ environment. According to the kinetic theory of gases, what is the average kinetic energy per molecule for this gas?

A. $4.14\times\:10^{-22}J$

B. $6.07\times\:10^{-21}J$

C. $2.02\times\:10^{-21}J$

D. 3652 J

E. The molar mass of the gas is needed to answer this question.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

07.38: Absolute zero is best described as that temp qh4gnhv04-, oz2i:ffdzqat2 erature at which

A. water freezes at standard pressure.

B. water is at its triple point.

C. the molecules of a substance have a maximum kinetic energy.

D. the molecules of a substance have a maximum potential energy.

E. the molecules of a substance have minimum kinetic energy.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

08.39: An ideal gas is enclosed in a container. The volume of the con9c qjo zl0:.kwtainer is reduced to half the original volume at constant temperature. According to kinetic theory, what is the best explanation for th :w9 0lj.zokcqe increase in pressure created by the gas?

A. The average speed of the gas particles decreases, but they hit the container walls more frequently.

B. The average speed of the gas particles is unchanged, but they hit the container walls more frequently.

C. The average speed of the gas particles increases as does the frequency with which they hit the container walls.

D. The average speed of the gas particles increases, overcoming the decreased frequency that they hit the container walls.

E. The internal energy of the gas increases.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

12.27: The pressure inside a container with two moles of an w/x- sp *qe2jwideal gas is 0.75 atm. The temperature of the gas2j*/wps e -xqw is $100^{\circ}C$. The container maintains constant volume as the pressure is tripled. Which one of the following choices best represents the temperature of the gas after the pressure is tripled?

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

12.40: Using the kinetic theory of gases, which one of the followingq.yhmm5/9v )aow xnebn 69.jl choices best represents the rms (root mean square) speed of 58 grams of a monatomic mw.b.)n /yxnlj99 hvme6 o5qaideal gas at a pressure of 3.0 atm in an enclosed container of volume 6.0 L?

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

14.37: A new element is discovered and named PhysicsBow3kgt7) cm uu8zlium (atomic symbol Phys). Its entry onto the standard periodic table of elements appears as in the figure (with Helium shown as well). Given a sample of Phys which acts as a perfect monatomic ideal gas, whaz)tmuu c 38kg7t is the root-mean-square speed of the atoms of the gas if the sample is at $20^{\circ}C$?

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