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 wr2ck6j8au7wd g9ot :du8 s+9 o:nobvthat

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 fi9-no 7u xtcrngrh(q1 p-.c0he 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 undex1--ofrt7ghi q9pc (cnn0u.rrstanding 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.g2v +0 h4ih(bc5cbh ee30 c where c is the speed of light. Electron #2 moves with speed 0.60 c. What is the ratio of the kinetic energy of electron #2 to electr(b+chhg0ebh 25eiv4 con #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 hc ::.c hy-yiulinear momentum (in units of kg.m/s) of an electron moving ichiyuh c::.y- n 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 movehbv o;)y8 to dtxc+hsmb;k473 with the magnitude of their linear momentum having a ratio of 2:1. If the slower electron k; bm;sdcohy+to x84 hb3)v7t 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 associated with an electron is twice its resp wd1-ar *k(bssz.p1 l.3pkux t energy. At what speed is the electron traveling(in unit of m/s)xkrdu3skplpb s..w(ap1*1 - z ?

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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 momentnvsu. b;z1 -ja su9bi1um 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 thiw)6(0yp jf1sekquxuee6ks 3/; it)b hs object is accelerated esxkk) uqp6(1 i/3eetyujfh)w6 sb; 0to 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. The5;;e+ x p3 aisourmyt3 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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