Momentum and Energy - 题库网 (tiku.one)

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1#

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04.22: One implication of Einstein's theories isinewtg *xyq5- *s77 au 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 which he can s5zze2 n+iw(kf :ckeqf0(th;mpontaneously convert an electron completely into energy in the laboratory without any other 02im(kt zq(wk5fnf+ehz ec ;: 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 0.3040q ,:ubupz6b3itr r:un3-ek lyqxv , 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 eqr:x:vk -u 3u6re, ty,0p liun43bqz blectron #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 momhjn93-ijn.2 ct5uxvzentum (in units of kg.m/s) of an electron moving in5zt.hjic -x 2 v93ujnn 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 mat/ nfj sr79 ,0akx8b/renhf/b gnitude of their linear momentum having a ratio of 2:1. If the slower electron moves n9/ts7/k/ h,anj0rb f8 frexb 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 twimie6fbc(tg m zgj5-72ce its rest energy. At what speed is the elegf65bi2z7cte j m-( gmctron 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 linear):4l us e(+* /gw0geuy pt2jp edou)ak 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 res r v(satpjf;ty*8n:f;;;m m kw *a:ffpt. After this object is accelerated to a spej mftrf(s* tpa f;m:fv*;w;: 8;yknpaed 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 tr h e2;g4tzwi frhq2 5c.h(c1rkavel 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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