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 gase8d7i+.tz3k 27uq2fj lzzxtkqay1l2 at 100 K is 200 m/s. What would most nearly be the average speed of the atoms at 300 ikk.7la x d1zqzf +2jyz ltte2 q73u82K?

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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 gra8)zujrfz) 2skhxm.f tuv5 1;v u z4/nwms of water until both the copper and waterr ftkzs 1h58z )u u4w/v ).vzufmn2j;x are at the same temperature. Which of the following 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 cylindri*0u v)o,/co ees .zsmucal piston. When the gas 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 ks+,sn .r,6)veo q/)kwb5 f:vmreecy ainetic theory of gases, when the absolute temperature of an ideal gas doubles, the average kinetic energy ,,e/r6 n )oy :rm.fe wvqkb5scsva)e+of the 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 collh apqxpmvf9q0)7orc5 *5x . ucide, then

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 gas is discovered and 2oos,gj 1* fnenamed “Physicsbowlium.” A pure 4-mn, gj*e1f soo2ole 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 temperature at whichxq8md: 4yb3)aur rw72 : /fvfgk y*euz

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**4 0 2u+8uihxfvoohrejd 4 um58bcvq the container is reduced to half the original volume at constant temperature.4hboij+ 0cf urduhuvx8v5 *q4ome8* 2 According to kinetic theory, what is the best explanation for the 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 in,nn w(mh 2*2e*nh myoaside a container with two moles of an ideal gas is 0.75 atm. The twaho2*nn,e mhmn*(y 2emperature of the gas 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 q m 1z7( fv3w;ugzptdt3is- 5lgases, which one of the following choices best represents the rms (root mean square) speed of 58 grams of a monatom vzz7d3 1lwp( tu;t s-g3fmqi5ic ideal 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 PhysicsBowlium (atomic symbol d6w3/xfqz c+ +u1 ljupPhys). 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, what is the root-mean-square speed 1lj6zf xup3cu+ w/dq+of the atoms of the gas if the sample is at $20^{\circ}C$?

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