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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 h.oex2lnrsmhrcy+ 1j* 33s, u theories 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 technnmx1l 5nzd .v2ique in which he can spontaneously convert an electron completely into energy in the laboratory without any other material required. What is n2mld nzxv15.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 speza( +4gi wm(g70 *lk)j e(zpys:yivw ied 0.30 c where c is the speed of light. Electron #2 moves with speed 0.60 c. What is 0i ykg):yizz4pvie(s7a+(m wwl* j(g 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 units of o ;75af/dwfk/nutzv8d(w5 m akg.m/s) of an electron moving in a straight line kf7(d85 umn taw/o5/ w;fazv dif 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 of their linear momentum having awj b-dp2c(2+j/ vibi u ratio of 2:1. If the slower elect2-ijvbu / 2(b+p wcjidron moves with a 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(uf,-npdx*dn3 cn (vw ron is twice its rest energy. At what speed is the electron tracwx-,n(dunpn*f 3d( vveling(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 5w6a8)i 5kwb3 yfba8 rv)s vo6m00 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 is initially lks4zfi+wn w swp,s1h4j*)h( at rest. After this object is accelerated to a speed o4hs+f41i )(pw ,swzn*k hj wlsf $2.4\times\:10^8\:m/s$ , 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 0 )h bwj7ctq4;(x x2s).qjxhoil sz2jtravel to 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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