Momentum and Energy - 题库网 (tiku.one)

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1#

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04.22: One implication of Eiu7l/jiuzkrdyvgudux8 /2 .97nstein'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 technique in which he can spontaned t74 pbg)+iw8atalw6ously convert an electron completely into energy in the laboratory without any other materiaw7t 64db+l ga iw8tp)al 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 cq 9aazz- qheyr*t/6 ,ho9fk*.30 c where c is the speed of light. Electron #2 moves with speed 0.60 c. What a/ho*rzkq 69h,c at zfqe-y*9is 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 magnitudgxh12ve jrt2; p)4i pph2f5x a,qt k6pe of the linear momentum (in units of kg.m/s) of an electron moving in a strxpt 12,2 )vhpfp;r5j xht ipqa4 62kegaight 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 li;*9ancq ssn:s ;.bfq znear momentum having a ratio of sns;:aq.9qfbsc zn ;* 2:1. If 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 r; 6g ;xb3dveyeest energy. At what speed is the electron teeb vgy6;xd ;3raveling(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 5)w4sswcqo : cy 8(fvfug3n.zkxz0obi 1 g6w77 00 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 l57 7g+,zi pv 4k wz0 s,px8hjm(ypoeyrest. After this object is accelerated to a speed of zs w (+ kji7,z,g58pymp40 xyel 7voph$2.4\times\:10^8\:m/s$ , 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 partigu;kr cj 7my*7yw ,t4fcles 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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