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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 thv1bv+k-kwqki*ibkw,paom;1,xv9 e+b him 98 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 perfected a technique in which he can sponttl55h j gevzhobgv0;ljg : kh10( p52haneously convert an electron completely into energy in the laboratory without any other material1 l0o gjlvt(hk;j5gh2 5 e0pbhvh5 :zg 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 /x5 w a-om6eix .:xw3rc5cigk05tfdp 0.30 c where c is the speed of light. Electron #2 moves with speed 0.60 c. What is the ratio of the kinetic energy of electr /t-w3fd po6:ii 5xamec5xc5wk rg0 .xon #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 momentumg4d p n2txc+;u*aa0p p (in units of kg.m/s) of an electron moving in +xgp2uaand 4;ptcp*0 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 modrd9r o /mc.-rve with the magnitude of their linear momentum having a ratio of 2:1. If the slower electron moves with a speed rcmd dr.o9/r- 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 itsxvrh kl678fb (+oov6 y rest energy. At whatkof 8(7 66xb+vvylohr speed is 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 anhs )0dix-p5,knk,z6nef s.gc01gjaq d 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 at rest. Afts/ hj)rf7tsi+ 9-pq xger this object is accelerated to a 7qgi9sfs-x r+ t)h/jpspeed 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 travmbjd;w agku.wx *2/ r)el 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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