Momentum and Energy - 题库网 (tiku.one)

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1#

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04.22: One implication of Einstein's t3ap ciur35iv4w *-vch4(dip gheories 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 whic2a87y a brzyfa4fd*v3h 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 undb8fza3v 24fryay *ad7 erstanding 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 spea*o8kw rtkb; 9* wscw*ed 0.30 c where c is the speed of light. Electron #2 moves with speed 0wo**;ab kr 8kwcwts9*.60 c. What is the ratio 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) :(sy mey0ero6 of an electron moving in a strair 6:me oys(e0yght 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 of their linear momentum haxevgg 1l3r;s8v o2q f*ving a ratio of 2:1. If the slower electron moves with a s g1*2;qvlg8xrv o3esf peed 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 associafswin5;ay 1 fwk *9n;oted with an electron is twice its rest energy. At what speed is the electron traveling(fwn;na ;o s1if w*5ky9in 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 momentui87 h2n k-fsrnm 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 pvk 8r1kc*c/dq*jb9 xoi yt :dht-0a1at rest. After this object is accelerated to a speed of ad kd */qj-t: 1 io1bxc9r yhk0pct8v*$2.4\times\:10^8\:m/s$ , 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 particle traveling afy5 y n e+gtx(2p4j(ldxu/ iq:t $2.4\times\:10^8\:m/s$ 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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