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 of Einstein's theories isjkiafp *m6)t .b l5bet0- jja4 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#

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06.35: A scientist claims to have perfected z uqg-m)gv4 +y2 hesg,a technique 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 understanding of e-gh )g,y +mq us2vg4zphysics?

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 wh:yrpmiq u5y54 ere c is the speed of light. Electron #2 moves with speed 0.60 c. 55qiyp 4myr:u What is the ratio of the kinetic energy of electron #2 to electron #1?

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4#

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09.50: What is the magnitude o7tk;*m7o5b fqt s o8siy dw;b)f the linear momentum (in units of kg.m/s) of an et7 ibsood*8mqk s 7t) fy5bw;;lectron moving in 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 magnlwr4eyt 3 +tm/itude of their linear momentum having a ratio of 2:1. If the slower electron moves with a speedw4 3 m/+ltteyr 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 electrv6qipk9j*0bk1m( 1 pdfok c6oon is twice its rest energy. At what speed is the electrod1ooib*k jcq 1v p 6p(k6m0fk9n 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 70llcrhrfs); nteol m 6i 4(h:total energy of 500 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 at rest.2xqt9fh; js+ xl,ahv b.ojj x*)4t a0y After this object is accelerated to,.)0t bq* t+xja2vasx9lhfyoj x4 ; jh 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 particles travel to the right. The p -6+s hscz.eovu;nqiojtij o34- a f3*article 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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