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1#

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04.22: One implication of Einstein's efu jg rl.l fp-t8)+i-p0,f:cswx 6dttheories 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 perfected a technique in which he can l)gqmr q5pdb11j19whn io25v spontaneously convert an electron completely into energy in the laboratory without any other materia1j5gm 2h9d qp)n1wilo5b rqv1l required. What 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 speed 0.30 c where c is the speed ofysdpcmpdlu)zu 1(y w;,e-1w vboq 3 7,wlz9c3 light. Electron #2 moves with speed 0.60 c. What is the ratio of the (93woww lmy,7spz3upd)1u;cqzy dlc , 1v-ebkinetic 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 eys03p6 cc.gn zhfh+ v9 4lp2iof the linear momentum (in units of kg.m/s) of an electron moving i6 p .gcyh+l04zhsev3i9cn p2f n 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 move with the magnitude g6-d2g k0jp(dxv 3y4z*m tjkdof their linear momentum having a ratio of 2:1. If the slower electron moves with g(mk4gpdj ztd3 xv0 jyd-k*26a speed 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 elect -mq;p cx(0 wv3ms2pfmron is twice its rest energy. At what speed is the electron tq m3vs2p c; -fmp0wm(xraveling(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 momen :+ c5v/kgf pcj t29fdl-(( zm4 nglla/l7rxtitum 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 m0( re,qxme,(+-ne6rc7z iztwvev oo8ass m is initially at rest. After this object is accelerated to a 8ex(iw-neqe+z 06 o7(,vrrt voz,cem 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 to th52-b e)yuvy )uhrau2de 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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