Momentum and Energy - 题库网 (tiku.one)

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1#

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04.22: One implication of Einstein's theories ivdqq ;fps /loc .*i5a1zcd amh(ad .1(s 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 3lw+g t a.9tj p(nv+quhe can spontaneously convert an electron completely into energy in the laboratory without any other material required. What is the conc9an qtv.pt+jguw +3(l lusion 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 witu6x0fy3 b svco xn1o76h speed 0.30 c where c is the speed of light. Electron #2 moves with speed 0.60 c. What is the ratio of thb1no7 s06xoxf6 ycvu 3e 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.y(sxxg+eu :5mxpz,w5 m/s) of an electron moving in a p,5xuys :5+gzxx em(wstraight 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 vdj362hgnk6 mwk q br83nxz30 with the magnitude of their linear momentum having a ratio of 2:1. If the slowdv8 q2303knxn6w3 jmb 6 ghkzrer 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 anlvdpgt *+09u4p)1l 5bay cx zzf 8cu:ssociated with an electron is twice its rest energy. At what speed is the electron tr)c 9 pcnatb0f*gv4u1lz+ yp :xd z85ulaveling(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 linear momentum of 300 .n zd78gb ;n4 pvrtu3hfgs,h8 $\frac{MeV}{c}$. 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 iah :c rr3z rr.4sxeae2ge+2 1p(5zdgfs accelerated to a speed of dr5a a:sxe2er g .+z 3rcz4(1gpr f2he$2.4\times\:10^8\:m/s$ , 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 tho2 mq,9 qf )6mk+ckivge 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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