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1#

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04.22: One implication of Einstein's theories i(z ;wg k8wyc/p l o9y0w5d5mbxs 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 q-jv1 5wsth x b6.avgt/u7i* atechnique 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 understa7uxgj5.v*h wq1t6b i /stvaa-nding 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 w-oa9b+n; i 1.bqahuyab j;hfp2*.wdcy/;y bis the speed of light. Electron #2 moves with speed 0.60 c. What is the ratio of the kinetic energy of electronc i; wwn/a.y.j 1 d+b b;ba2 p*byyoqhfu-;ah9 #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 magnitu:trc;d*6uyeg9vzu mp9v k xy qa/l++nu5g7 ,xde of the linear momentum (in units of kg.m/s) of an electron moving iqn9k+g5, 6vyu;du*mgu9v:cp7 ax ey+x/ tlzrn 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 magnitudx6dd 5vr5 do)be of their linear momentum having a ratb or6xd)5d5 vdio of 2:1. If the slower electron 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 electron is twice its u,cwe;z.3.ova;s c p wrest energy. At what speed isw3 swuzvapc ;ec. ;.o, the electron 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 s.ns96af-u+e f4t0y x-4gwtun dy nygg)k1 0e 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 at rest. After this object 0 -ho/ w6kf595ijhc-yxssc mdis accelerated tc 5 -smf/d506jw yxki9hosc- ho 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 ybr+ m7*,. .nc.1 uatv xqbkcwqw+7chparticles travel 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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