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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 Eiu2cbiiwb3p*-v. 2 l n2h cx*wk)q7 lnxnstein's 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 technique in which he can spon dgqfq vqjp 9)(zgx,,d7,8w hsmh,w 8rtaneously convert an electron completely into energy in the laboratory without any other material required. What is the conclusion about this claim vdfq, ,gq8z jrw)qhp m8 ,9s,7hdw xg(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 of light. i,2*ewxqt2lt (x -e tgsqen*mno (9d2Electron #2 moves with speed 0.60 c. What is the ratio of the kinetic energy of electron #2 to electron #1*ie g(e n9w( lxstde tt*-2qxmo,22qn?

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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 mom swwxj1rotob3g+ .84oentum (in units of kg.m/s) of an electron moving in axgos1wot8o. j w 3rb4+ 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 ry2+c(8oyjzj of their linear momentum having a ratio of 2:1. If the slower elzjjr(2yc oy+8 ectron 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 twe;8 ib2ep *sbdice its rest energy. At whatbedeb;p8i*2 s 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 Me sqmf,oitl5-jxz 2b32V 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 at rest. After this object is accelerat-ueew89skb;:k .rlk ped-9lk.;rw :ee8 kspu bk to 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 particlez1wj sd. c,4mo g0rdt6b-z p-bs 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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