Momentum and Energy - 无忧得胜-网上国际课程 (5edu.win)

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1#

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04.22: One implication ovewr9rh+-ax;n9cdo l -kh i20f Einstein'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 ib4woh-mdu;.cdm mi 8,t;ra5e *jvb0f n which he can spontaneously convert an electron completely into energy in the laboratory without any other material requiredtdah j4mmb *iuvwmo ;b85-.cd; f0e ,r. 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 1 gv:rz9kx,xp88f:5 ugpa 5dofxz -ixwhere c is the speed of light. Electron #2 moves with speed 0.60 c. What is the ratio x,5gf1kx:piz9gr-8 5x8a d:fvx p ouz 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 kg.m/s) of an72(x z rmlrcpu8i k2q2 electron moving in a straight linu27(p r2kc ml8z2q xire 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 ma1ymvss.9/x kh 5.ois fgnitude of their linear momentum having a ratio of 2:1. If the slower electsfxs v./9 5yo. skim1hron 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 is00yo*m xm u8, lljnxq) twice its rest energy. At what speed is the electron traveling(in unmlyj8 x00l)q,n* uomxit 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 momentum of3z9gm:m 9ott0c 0ci)xh lzq* q 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 mv.x6vl(zk r n1 2vyp5:b9sh1 3mcktybass m is initially at rest. After this object is accelerated to vyb. m9n 1 b2zvvty13ksr:hpl6 (kc 5xa 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 particl 7/ac 3lrow,kuem(f z::rhgo;es 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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