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1#

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04.22: One implication of Einstein's th zq9r2q2gve 4hffu)bj+q 2)1pq ycls*r*tw 7v eories 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 claims to have pereok14mpifi-v5pzx6 rm: mx6 y4u*px0fr-s3e fected a technique in which he can spontaneously convert an electron completely into energy in the laboratory without any other material required. Wha 4r*rx0efpe ipm yxxmm6 1fzk5-3 :iupo-64svt is the conclusion about this claim from our current understanding 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 spho0hn y:oew,x)v5tcrc 7 njf(* ..ifi eed 0.30 c where c is the speed of light. Electron #2 moves with speed 0.60,c7(0 h: iwoyjef) ntvhi.nf*.xr oc5 c. What is the ratio of 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 uo8 .m3w((jeen wbf 5lynits of kg.m/s) of an elecwew. m eyj(8fln 5b(o3tron moving in a straight line if it has $3.2\times\:10^{−13}J$ 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 mobfuz :: ga ol(psc64mq-e 2kdx:6*gwdve with the magnitude of their linear momentum having a ratio of 2:1. If the slower electron moves with a spe: xw4(d6 k-ed:o*gsbpm6 ca:lf2qgu zed 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 rest enervf ()i+ga* o0(ypjv*t+nvqqb gy. At what speed is the elecv+qv(v(+jb*oa g )0 y*q pfntitron 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 21e x;uguo*dta total energy of 500 MeV and a linear momentum 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 io xpq 9+;eh,ydv 4vc9)9tfkfms initially at rest. After this object is accelerated te)4 h9y;fm9q9 d,txp kv+f vcoo a speed 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 tqg1bp xbh48awf,)5k7stw wn 9 o the right. 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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