6.1 special relativity 1 - 无忧得胜-网上国际课程 (5edu.win)

1#

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Two cyclists, A and B, start riding their bicycles from the same point. Cyclist A moves northwards with a speed of $4V$ relative to the ground, and cyclist B moves westwards with a speed of $3V$ relative to the ground.

The magnitude of the velocity of the Cyclist A relative to the Cyclist B is

A. $v$

B. $4v$

C. $5v$

D. $7v$

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2#

单选题 ( 1.0 分) 切至整卷模式 eid: 17520 对错数 0:0 难度: *****

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Observations of muon decay can be used as evidence of

I. Time Dilation
II. Length Contraction
III. Absolute Simultaneity

A. statement I only

B. statement II only

C. statements I and II only

D. statements II and III only

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3#

单选题 ( 1.0 分) 切至整卷模式 eid: 17521 对错数 0:0 难度: *****

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At a relativistic speed, a rocket j j ooc7i6ry l tj,jw)rk3d.1h2ourneyed from Earth to Saturn. The duration of the traj1c lj) 2othr.kry7jo 6diw3, vel is measured according to the stationary observer on earth as $t$. The length of the rocket is measured according to the observer in the rocket as $L$. Which of the following is correct for the time of travel according to the observer in the rocket and the length of the rocket according to the observer on the Earth?

A. Time of travel (rocket observer) is less than t; Length of the rocket (Earth observer) is shorter than L

B. Time of travel (rocket observer) is less than t; Length of the rocket (Earth observer) is longer than L

C. Time of travel (rocket observer) is greater than t; Length of the rocket (Earth observer) is shorter than L

D. Time of travel (rocket observer) is greater than t; Length of the rocket (Earth observer) is longer than L

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4#

单选题 ( 1.0 分) 切至整卷模式 eid: 17522 对错数 0:0 难度: *****

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You are riding in a spaceship that has eopx l7y;gicw 8mwe;*5mq0c,no windows, radios, or other means for you to observe or7c;0*5e8,iw mp;glqeywmc xo measure what is outside. You wish to determine if the ship is stopped or moving at constant velocity. What should you do?

A. You can determine if the ship is moving by determining the apparent velocity of light.

B. You can determine if the ship is moving by checking your precision time piece. If it's running slow, the ship is moving.

C. You can determine if the ship is moving either by determining the apparent velocity of light or by checking your precision time piece. If it's running slow, the ship is moving.

D. You should give up because you have taken on an impossible task.

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5#

单选题 ( 1.0 分) 切至整卷模式 eid: 17523 对错数 0:0 难度: *****

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The Michelson-Morley b x lxve:9rl07experiment was designed to measure

A. the relativistic mass of the electron.

B. the relativistic energy of the electron.

C. the velocity of the Earth relative to the ether.

D. the acceleration of gravity on the Earth's surface.

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6#

单选题 ( 1.0 分) 切至整卷模式 eid: 17524 对错数 0:0 难度: *****

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Michelson and Morley concluded from the results of their expeh p0ikw oy+)c60ed14rf q,idnriment that

A. the experiment was a failure since there was no detectable shift in the interference pattern.

B. the experiment was successful in not detecting a shift in the interference pattern.

C. the experiment was a failure since they detected a shift in the interference pattern.

D. the experiment was successful in detecting a shift in the interference pattern.

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7#

单选题 ( 1.0 分) 切至整卷模式 eid: 17525 对错数 0:0 难度: *****

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You can build an interferometeraoh4.o s (q(j*/j gjuxe:k6r*s qd7z r yourself if you use the following components:

A. a light source, a detector screen, a partially silvered mirror, a flat mirror, and a glass plate.

B. a light source, a detector screen, two partially silvered mirrors, and a glass plate.

C. a light source, a detector screen, two partially silvered mirrors, a flat mirror, and a glass plate.

D. a light source, a detector screen, a partially silvered mirror, two flat mirrors, and a glass plate.

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8#

单选题 ( 1.0 分) 切至整卷模式 eid: 17526 对错数 0:0 难度: *****

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The theory of special rebzzc ie,d x 4f als,0n1k98:molativity

A. is based on a complex mathematical analysis.

B. has not been verified by experiment.

C. does not agree with Newtonian mechanics.

D. does not agree with electromagnetic theory.

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9#

单选题 ( 1.0 分) 切至整卷模式 eid: 17527 对错数 0:0 难度: *****

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One of Einstein's postulates in formulating the special the tlxx j t607br7nsf(,r +xs2b k.rdx5jory of relativity was that the laws of phys6x+ltdb,(b7xxjs nx7rkf0tr j 5r.s2ics are the same in reference frames that

A. accelerate.

B. move at constant velocity with respect to an inertial frame.

C. oscillate.

D. are stationary, but not in moving frames.

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10#

单选题 ( 1.0 分) 切至整卷模式 eid: 17528 对错数 0:0 难度: *****

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If you were to measure your pulse rate while in a spacesz6ug4b +rllw5uo5 a w9hip moving away from the Sun at a speed close to the spw4z u659l robgu5a+w leed of light, you would find that it was

A. much faster than normal.

B. much slower than normal.

C. the same as it was here on Earth.

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11#

单选题 ( 1.0 分) 切至整卷模式 eid: 17529 对错数 0:0 难度: *****

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Relative to a stationary observer0x2q: zcrkg;r sm (c,wy5 /cnx, a moving clock

A. always runs slower than normal.

B. always runs faster than normal.

C. keeps its normal time.

D. can do any of the above. It depends on the relative velocity between the observer and the clock.

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12#

单选题 ( 1.0 分) 切至整卷模式 eid: 17530 对错数 0:0 难度: *****

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The gamma factor is definel*k8 -rms6zw uxwp3vr2:,bl ed as $\gamma = 1 / \sqrt{1- (v/c)^2}$, therefore gamma ($\gamma$)

A. can be zero.

B. can be any number less than or equal to one.

C. can be any number greater than or equal to one.

D. cannot equal one.

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13#

单选题 ( 1.0 分) 切至整卷模式 eid: 17531 对错数 0:0 难度: *****

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Suppose one twin takes a ride in a space ship traveling at a vefmj,yf+ l h 2ex6pda:5ry high speed to a di 2fmp6+ lya5hdefj: ,xstant star and back again, while the other twin remains on Earth. The twin that remained on Earth predicts that the astronaut twin is

A. younger.

B. the same age.

C. older.

D. cannot be determined from the given information

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14#

单选题 ( 1.0 分) 切至整卷模式 eid: 17532 对错数 0:0 难度: *****

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Relative to a stationary observemzrl3 u/ we:+ur, a moving object

A. appears shorter than normal.

B. appears longer than normal.

C. keeps its same length time.

D. can do any of the above. It depends on the relative velocity between the observer and the object.

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15#

单选题 ( 1.0 分) 切至整卷模式 eid: 17533 对错数 0:0 难度: *****

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An object moves in a direction parallel to its length wiss-+ ibe5w6juivy 7; fth a velocity that approaches the velocity swb5j ei;-su+f6v7 yi of light. The width of this object, as measured by a stationary observer,

A. approaches infinity.

B. approaches zero.

C. increases slightly.

D. does not change.

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16#

单选题 ( 1.0 分) 切至整卷模式 eid: 17534 对错数 0:0 难度: *****

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An object moves in a dit *v ;t/ywptx0otmvc9- +x (sirection parallel to its length with a velocity that approaches the velocity of light. The length of this object, as measured by a stationary observer,x -yox tsct0tt(m+*ivv/wp ; 9

A. approaches infinity.

B. approaches zero.

C. increases slightly.

D. does not change.

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17#

单选题 ( 1.0 分) 切至整卷模式 eid: 17535 对错数 0:0 难度: *****

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As the speed of a particle appr/w;; xni-1ommcpa0y3o vrb +aoaches the speed of light, the mass of the particlem wpya+;ab1;r-vnmo/o03 xi c

A. increases.

B. decreases.

C. remains the same.

D. approaches zero.

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