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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 Einstein's theor0. chwe3k(xt mies 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 perfecte+c h;8d w o5wb lfh6g;otuxx0 /j1b:oyd a technique in which he can spontaneously convert an electron complht8gxbj/: ud xb1ho5 o;c 0yf;w6wl+ oetely into energy in the laboratory without any other material required. 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 w 7gr9un-h8o4 6z fa8 k7dlmvslhere c is the speed of light. Electron #2 moves ufvz-7r8d 6hls4k9 gmoaln78 with speed 0.60 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) of an-ig1jbz5 ( t,y(bjsi 5.3sr.y vwrlav electron moving in a straight line if it has (r l bs5srv5jg.z( ti aywv3b,yi1-.j$3.2\times\:10^{−13}J$ 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 hadyx-g73 j ooy(ving a ratio of 2:1. If the slower electron moves with a3yx-o g7d(jyo 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 assov1sal d h.ius z74hk*0 afa,)ociated with an electron is twice its rest energy. At wh7k4z *fh 0hliaads1) .ua s,voat 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 MeV and a linevt: cs-ryjj+7 k)t, ps1svr1okq /k2 jar 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 )91ysxfwgur2t);jh lat rest. After this object is accelerated to a speed ofts)ful yj1xw2)9 rg ;h $2.4\times\:10^8\:m/s$ , 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 t:u8g2bed/tiy8 beo )che 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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