Momentum and Energy - 题库网 (tiku.one)

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1#

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04.22: One implicaticgzz r78:po:g9e+x8 w/gb si e n03cpyon 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 technique in which he ca,/us 1hoarvn( n spontaneously convert an electron completely into energy in the laboratory without ara(,u/h so 1nvny other 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 movf2 fy8r9 ga:e)vyxjh(dp mgx/b,5rw)es with speed 0.30 c where c is the speed of light. Electron #2 moves with speed 0.60 c. What is the ratio (9)y adr:xg/fmv j eg) 2y8bp5,frh wxof the kinetic energy of electron #2 to electron #1?

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4#

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09.50: What is the magnitude of the linear momentum (ntorh:8y:gx8 qnr1f 9 in units of kg.m/s) of an electron moving in r xn1gr: 8yto9qh8: fna 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 momentum hav6 zbgui-qp9t.v67tj1s w :ho hing a ratio of 2:1. If the slower elect1p- o itwz7 s9ghq6hb6.t:vuj ron 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 w k ) )btl:otay(1*a jmq/ru7xqith an electron is twice its rest energy. At what speed is the electron traveling(in unit of m/tqkaru/q() m*j:b71loa y x)t 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 tota 3ad)nc+:*w* )lxmwmpe feb zi iy2d(.l 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 zb)p7r 0ljo .dm is initially at rest. After this object is accelerated to a speed ojp)d .7rz0blof $2.4\times\:10^8\:m/s$ , 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 (nurirdr2q- *6p pk6mtravel 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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