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 is t 8ih)vzd ,ioo+hat

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 perfectedfe -kolg xwx:/sbl9(q yb+: f- a technique in which he can spontaneously convert an electron completely into energy in the laboratory without any other material required. What is the conclusio-w/llb -fbsg o qe9f(k+xy:x :n 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 -,*8msg -fsn(i x 9zjjzwm*-.5 t unr :bhcwgrwith speed 0.30 c where c is the speed of light. Electron #nw mu fx9-tcg8 rnbmi5* jg(z *s-j.rwh,z-s:2 moves 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 hm* yw4./ l +swmo+5anb ;jgnothe linear momentum (in units of kg.m/s) of an electron mlhy4b.am + +/ nom wn;5gjows*oving 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 magnitude of their linear moment +kop 10utqb9d17ow ubnq6j 0zv*ng6 tum having a ratio of 2:1. If the slower electron moves with a speed ok6 *oj utnng0dqq6v71otu+pbzw9b 10f $1. 20\times\:10^8\:m/s$, 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 is twice its rest energc5 k+6tdoo:p4bs dv 3uy. At what speed is the electron traveling(in unit ofvpdtu o6bod4s:35ck + 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 ts3tca( -p n6e y7 o*/iv4yelpnotal 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. After this object is accaf9hdul5)fj9 qlhh :*iy u wy7i8pe.2;b tmg9elerated to a fa*8u9;2fylh. )mge l: py9 bq7 jit5idh9wuhspeed 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 r)prp:w-0 kh uparticles 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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