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1#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

04.22: One implicationd7uuc;hnmh le(7 blzl3rp1zp 4s 9- 1e of Einstein's theories 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 techniquebaqlvg q+,* .k;tp.x(g9shey;n-xi k in which he can spontaneously convert an electron completely into energy in the laboratory without any other material required. What is the concl-b(gq.,*xikgxeat qyp+9 ;l vnkhs;. usion 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 //: 1zawkhumm j+lmi6+yd+. j*gzh pfc where c is the speed of light. Electron #2 moves with speed 0.60 c. What is the ratio of the kinf/*6phwy g1m.mhji+zz:ml ++a/kj udetic 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 j.4ajf8.k7 iqc ss yst:7p8qd kg.m/s) of an electron moving in .7 4:ssta78dypsjjqqc .8kfia 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 withlk illp(64m o/ the magnitude of their linear momentum having a ratio of 2:1. Imi (kl/46lo lpf the slower 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 associated with an electron is twice its rest k*f)ts* w w+ktos-9 kqenergy. At what speed is the electron traveling(in unit of k+t-ks9fw*)qosk t*wm/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 ene38 -vwtf sz7-ns. t a.e2gohbdrgy 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 atzs*zqvm2bnx (l7) l t* rest. After this object is accelerated to aqz (msnlb t*x2l)zv* 7 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. The particle traveling at-aqdc ,54nixj $2.4\times\:10^8\:m/s$ 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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