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1#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

04.22: One implication of Einstein's theoriesetk *5lyn -v.l is that

A. all energy has mass properties.

B. moving particles apparently lose mass.

C. momentum is not conserved in very high-speed collisions.

D. a meter stick moving rapidly perpendicular to its length appears shortened in length.

E. every process is relative.

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.35: A scientist claidk*zmc rd)45 0tnt8gyv .i.d tms to have perfected a technique in which he can spontaneously convert an electron completely into energy in the laboratory without any other material required. What is the conclusion about this claim from our current g0.n5d84 .mdt t )t*ykizcvrdunderstanding of physics?

A. This is possible because Einstein’s equation says that mass and energy are equivalent… it is just very difficult to achieve with electrons

B. This is possible and it is done all the time in the high-energy physics labs.

C. The scientist is almost correct… except that in converting the electron to energy, an electron’s anti-particle is produced in the process as well.

D. The scientist is almost correct… except that in converting the electron to energy, a proton is produced in the process as well.

E. This is not possible because charge conservation would be violated.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

08.45: Electron #1 moves with speed 0.3p/e/ tjr:ys o*0 c where c is the speed of light. Electron #2 moves with speed 0.60 c. What is the ratio of/sp:j t/eor*y the kinetic energy of electron #2 to electron #1?

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

09.50: What is the magnitude of the linear momentum (in uni sbha) ym8z160dm1rz xts of kg.m/s) of an electron moving in a straight line if it has11 mbx h 0z8rsdyzm6)a $3.2\times\:10^{−13}J$ of kinetic energy?

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

13.49: Two electrons move with the magnilk 8ko ekc qm5sq;h728tude of their linear momentum having a ratio of 2:1. If the slower electron moves with a spoc8q8;h57 l 2kemk sqkeed of $1. 20\times\:10^8\:m/s$, what is the speed of the faster moving electron (in unit of m/s)?

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

15.49: The kinetic energy associated with an electron is twice its re/l bpn hv9 +pvgq2v,qsm(fe/y4ex,,w st energy. At what speed is the w,yqx vv,s p+ bmv2h,n(g ee// pq4fl9electron traveling(in unit of m/s)?

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

18.49: A particle has a total energy of 500 MeV and a linear momtd5nk- x)w)fjnmkm :0s7;vph entum of 300 $\frac{MeV}{c}$. What is the mass of the particle?

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

10.50: An object of mass m is initially at rest. After this objectrtdre+.v+vp /ah; ai : is accelerated to a ph;d+ avtvi:./ra +erspeed of $2.4\times\:10^8\:m/s$ , it collides with and sticks to a second object of mass m at rest. Immediately after
the collision, what is the common speed of the two masses (in unit of m/s)?

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

17.49: Two identical particles travel to the right dz:xcb h:cqt j2+re+6. The particle traveling at $2.4\times\:10^8\:m/s$ collides with and sticks to the other particle traveling at $1.8\times\:10^8\:m/s$. Which one of the following choices best represents the speed of the resulting object after collision(in unit of m/s)?

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