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PRACTICE：Physics Unit26: Special Theory of Relativity

本Practice来源于https://webassign.org，是在线Practice的打印版，您也可以访问本平台网站(https://webassign.org/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 325 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://webassign.org/test325.html
Author: physics Total Marks: 61 mks Marks Awarded: _____________

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1#

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You are riding in a spaceship that hasz 66rtgt(zk i; no windows, radios, or other means for you to gzz (6 k;irtt6observe or 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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2#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

The Michelson-Morley experiment was designed to )3xpp4 mu em hmwmt, dpb9c17-5ix7muv(vli8measure

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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3#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

Michelson and Morley concluded from the results of th kqjl :lavqm7 + 5u)uo,(dkqa,eir experiment 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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4#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

You can build an inte(kpcd+ ysd w+3ge4/nerferometer 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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5#

Free-Response ( 1.0 marks) Whole-Paper View Save Problem

State the relativity pc9 g9++r)hsnb s.y fw3co925qej+oxgvfe o1q rinciple.

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6#

Free-Response ( 1.0 marks) Whole-Paper View Save Problem

State the three unprovable assumptions of Galilean-Newtonian rzdbtu .l:l4b1elativity.

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7#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

The theory of special relatid2itz ( fj( c.vsd /b7quj7sg9vity

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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8#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

One of Einstein's postulates in formulati*o) 9lbc lux6d3n 4rih *m5vzu6zecx,ng the special theory of relativity was that the laws of physics are the same in reference fc xc lul4 h* u)6erbvodz9z*65mxi n3,rames 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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9#

Free-Response ( 1.0 marks) Whole-Paper View Save Problem

State the first postulate ofx :e h(6ug y0mls-nt3t special relativity.

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10#

Free-Response ( 1.0 marks) Whole-Paper View Save Problem

State the second postulate of special rez (ajvt2 pzpe d3y0+.s1clnslv8i a9*lativity.

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11#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

If you were to measure your pulse rate whg. wp5q/zasz,ile in a spaceship moving away from the Sun at a speed clos/azq,.sp zg5w e to the speed 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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12#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

Relative to a stationary observer, a moving c(c.fwy lw8+zp4d8gl e+,x r qllock

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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13#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

The gamma factor is defizy cx3m.24ta5cvmms7 87ji mcned 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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14#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

Suppose one twin takes a ride in a space ship traveling at a very high sb qn.yoql2f4;8a/nr bzg v/s 1peed to a distant starlaz/nb nqsy;4g f /q1 .2r8vob 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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15#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

Relative to a stationary obsqo ov5tu s /2sz/q*/xcerver, 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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16#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

An object moves in a direction parallel to its length with a veloov ti* -fo) ys7+2.gcdxz92rhmg7r vsj 5sn+fcity that appro257.+fszsoh7odjrxf* icmn gysv g9+tv-) 2raches the velocity 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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17#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

An object moves in a (kc3rr;uk h-ps6(fcf direction parallel to its length with a velocity that approaches the velocity of light. The length of this object, as measured by a stationary obsek( crs;ckf6p- h(uf3 rrver,

A. approaches infinity.

B. approaches zero.

C. increases slightly.

D. does not change.

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18#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

As the speed of a particle approache )0gnzuz8w*m 0gs vwa(s the speed of light, the mass of the particlw8wza*mnv 0g0 szug ()e

A. increases.

B. decreases.

C. remains the same.

D. approaches zero.

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19#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

As the speed of a particle approaches the speed of light, the mom 7ny*cqk, fur2-z 3iisb26f xnentum of the pari r3n 276ykz-,2qsfiucb*fn x ticle

A. increases.

B. decreases.

C. remains the same.

D. approaches zero.

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20#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A spear is thrown by you at a very high speedy qm 3c7ohls 2vooy8b.*m z.k+. As it passes, you measure its length at one-half its normay 3cbmz mv7qlo2o.+.s ky8* hol length. From this measurement, you conclude that the moving spear's mass must be

A. one-half its rest mass.

B. twice its rest mass.

C. four times its rest mass.

D. none of the given answers

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21#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

What happens to the kinetic energy of q/rkfntsvt: g b7mx -rz8,+q)a speedy proton when its relativistic mass rs,nv8b kt rmgf-z7:t+q /) qxdoubles?

A. It doubles.

B. It more than doubles.

C. It less than doubles.

D. It must increase, but it is impossible to say by how much.

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22#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

What happens to the total r chm8selsyp :*3a.bl.elativistic energy of a speedy proton when its relativ83 b*.hasly:cs.p eml istic mass doubles?

A. It doubles.

B. It more than doubles.

C. It less than doubles.

D. It must increase, but it is impossible to say by how much.

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23#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

Consider a particle ofi (jck h6f l9 n5ka3ts 51d+dd s3sfflj8xba+2 mass $m$ and rest mass $m_0$. Which of the following is the correct expression for the kinetic energy of such a particle?

A. $\frac{1}{2} m_0 v^2$

B. $\frac{1}{2} m v^2$

C. $m c^2 - m_0 c^2$

D. $\frac{1}{2}(mc^2 - m_0 c^2)$

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24#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

Consider two spaceshipsa b/*v rkzk7s4weld7 (, each traveling at 0.50c in a straight line. Ship A is moving directly away from the Sun and ship B is apprdvak4bk7sl /e(zwr7 * oaching the Sun. The science officers on each ship measure the velocity of light coming from the Sun. What do they measure for this velocity?

A. Ship A measures it as less than c, and ship B measures it as greater than c.

B. Ship B measures it as less than c, and ship A measures it as greater than c.

C. On both ships it is measured to be less than c.

D. On both ships it is measured to be exactly c.

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25#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

Which of the following depends on the observer's frame 6r-he7* :xs:st aggvpof reference?

A. the mass of the proton

B. the length of a meter stick

C. the half-life of a muon

D. all of the given answers

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26#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

As the velocity of your spaceship increases, you wopk-/f5u vla9 ruld observe

A. that your precision clock runs slower than normal.

B. that the length of your spaceship has decreased.

C. that your mass has increased.

D. all of the given answers

E. none of the given answers

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27#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A boat can travel 4.0 m/s in still water. With what speed, relativp.7tt1lhe r, xe to the shore, does it m7l1,p xhtet r.ove in a river that is flowing at 1.0 m/s if the boat is heading upstream?

A. 3.0 m/s

B. 4.1 m/s

C. 4.8 m/s

D. 5.0 m/s

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28#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A boat can travel 4.0 m/d:zup h,tx rxf6 /j /sdo4*ge5s in still water. With what speed, relative to the shore, does it move in a s zop/x :,/efxdrhud jtg4*65 river that is flowing at 1.0 m/s if the boat is heading downstream?

A. 3.0 m/s

B. 4.1 m/s

C. 4.8 m/s

D. 5.0 m/s

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29#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A boat can travel 4.0 m/s in stillb k5t2u0tg/vucu: y*e, xl+ho water. With what speed, relative to the shore, does it move in a river that is flowing at 1.0 m/s if the boat is heading strai x uh05:/*tybuucg+t2kv o,elght across the river?

A. 3.0 m/s

B. 4.1 m/s

C. 4.8 m/s

D. 5.0 m/s

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30#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

How fast should a moving clock tra jf65iz4tm96ouc n6b xvel if it is to be observed by a stationary observer asb6uco564ft6 in x9mjz running at one-half its normal rate?

A. $0.50 \; c$

B. $0.65 \; c$

C. $0.78 \; c$

D. $0.87 \; c$

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31#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A spaceship takes a nonstop journey to a planhp(.gw b (be4zz:0 k qluzhk**et and returns in 10 hours according to a clock on the spaceship. If the speed of the spaceship is 0.8uz (p(.h0*wgbzlezk*q : bk 4h0c, how much time has elapsed on the Earth?

A. $3.2 \; h$

B. $7.0 \; h$

C. $15 \; h$

D. $17 \; h$

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32#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A set of twins, Andrea and Coo u-v0accc l+/urtney, are initially 10 years old. While Courtney remains on Earth, Andrea rides on a space ship which travels away from Earth at a speed of 0.6c for five years (as measureuc0-/lco av+c d by Courtney), then turns around and comes back at 0.6c. When Andrea returns, Courtney is 20 years old. How old is Andrea upon her return?

A. $10 \; years$

B. $12 \; years$

C. $18 \; years$

D. $20 \; years$

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33#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

One 20-year-old twin broxvkjccd 70ns ./dfs-5 ther takes a space trip with a speed of 0.80c for 30 years according to a clock on the spaceship. Upon returning to the Earth, what is his own age and the age of the Earth-based twin brosdv ./05ck7ncjfds- xther?

A. 20; 30

B. 30; 50

C. 50; 70

D. 70; 90

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34#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A meter stick is moving toward you with a speed of 0.80c. What is its le*15kmuo8 6tqrvol) jw(b 2 0ee l5zx -egro6icngth?

A. zero

B. $0.40 \; m$

C. $0.60 \; m$

D. $1.0 \; m$

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35#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

How fast would a rocket ship have to move to contract to half of its pr,xmd4q tt4s,:zjv r:p+ spe3z oper length (as observed by a stationary es4z xm v t,rd:p,4jztqsp+3:object)?

A. $0.50 \; c$

B. $0.65 \; c$

C. $0.78 \; c$

D. $0.87 \; c$

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36#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

The length of a spaceship is 10 m when it is at re ji9b -p 4 ;uq79rm1udfj-8t1gsmktle st. If the spaceship travels by you with a speed of 0.70c, what lmj g9k1- - i9b tfpmudqule4t;jsr87 1ength does it appear to you?

A. $5.5 \; m$

B. $7.1 \; m$

C. $12 \; m$

D. $18 \; m$

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37#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

The closest star to our solar system is Alpha Centaurt 3/utqzc5uv6rfk u:*i, which is 4.30 light years away. A spaceship with a constant speed of 0.800c rela t /65:v3*uk ufutrzcqtive to the Earth travels toward the star. What distance does the space ship travel according to a passenger on the ship?

A. $2.58 \; ly$

B. $3.52 \; ly$

C. $4.12 \; ly$

D. $4.30 \; ly$

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38#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

The closest star to our solar system is Alpha Centauri, which is 4.30 ligsna s3 el+qr50ht years away. A spaceship with a constant speed of 0.800c relative to the Earth travels toward the star. How much time would5+ers0 sqan3l elapse on a clock on board the spaceship?

A. $3.23 \; y$

B. $4.40 \; y$

C. $5.15 \; y$

D. $5.38 \; y$

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39#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

The closest star to our solar system is Alpha Centauvi*dt qbu l eu(2;vve3xb3+m 3ri, which is 4.30 light years away. A spaceship with a constant speed of 0.800c relative to the Earth travels toward the star. How mue ubld 2 mv;ixu*+33e3tv bvq(ch time would elapse on a clock on the Earth?

A. $3.23 \; y$

B. $4.40 \; y$

C. $5.15 \; y$

D. $5.38 \; y$

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40#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

An electron is traveling atp og *q4* va ///cw2gydxpg-i xw4tk2o 0.85c. What is its mass? (The rest mass is $9.11 \times 10^{-31} \; kg$.)

A. $1.4 \times 10^{-29} \; kg$

B. $7.2 \times 10^{-30} \; kg$

C. $1.7 \times 10^{-30} \; kg$

D. $2.4 \times 10^{-30} \; kg$

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41#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

What is the speed of a proton if its )aafj*ug 5a41t 4tfz3dnhgpiz53 . dxmass is twice its rest mass?

A. $0.50 \; c$

B. $0.68 \; c$

C. $0.73 \; c$

D. $0.87 \; c$

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42#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

If the velocity of your spaceship goes from 0.3 c to 0.6 c, 0mmv+ /sxog .xthen your mass will incm +vom/x .0sgxrease by

A. 19%.

B. 38%.

C. 100%.

D. 200%.

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43#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

What is the momentumqzzklr(cf4x pb- ;23+ d ic7eb in $kg \cdot m/s$ of a proton when it is moving with a speed of 0.60c?

A. $1.2 \times 10^{-19} \; kg \cdot m/s$

B. $1.5 \times 10^{-19} \; kg \cdot m/s$

C. $3.0 \times 10^{-19} \; kg \cdot m/s$

D. $3.8 \times 10^{-19} \; kg \cdot m/s$

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44#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

During a reaction, an element lsc 1pfze2+( z) 2hmhumoses $4.8 \times 10^{-28} \; kg$ of mass. How much energy (in Joules) is released?

A. $4.3 \times 10^{-11} \; J$

B. $1.4 \times 10^{-19} \; J$

C. $1.6 \times 10^{-36} \; J$

D. $5.3 \times 10^{-45} \; J$

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45#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

During a reaction, $1.7 \times 10^{-4} \; J$ of energy is released. What change of mass would cause this?

A. $5.1 \times 10^{-4} \; kg$

B. $1.5 \times 10^{-13} \; kg$

C. $4.8 \times 10^{-18} \; kg$

D. $1.9 \times 10^{-21} \; kg$

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46#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

How much energy would be released if 2.0 kg of i7*oa,tk ve0l. wkr3 wmaterial was lost during a reaction?twkelk* ., a30w vi7or

A. $1.8 \times 10^{17} \; J$

B. $1.5 \times 10^{16} \; J$

C. $6.0 \times 10^{8} \; J$

D. $4.7 \times 10^{-8} \; J$

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47#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

The amount of energy equivalent to two kilogram of mas3o*k k:f+rfx4df a igc 1dx4:xs at rest is

A. $18 \times 10^{16} \; J$.

B. $3.0 \times 10^{8} \; J$.

C. $9.0 \times 10^{16} \; J$.

D. none of the given answers

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48#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

The atomic bomb that was dropped on n ;)k*o*de rru+z bfx,Nagasaki in 1945 killed 140,000 people, helping to end World War II on the next day. It released energy equivalent to that of 20,000 tons of TNT explosivrz +of ;*,kdnur*b )exe. How much mass was converted to energy when this took place? (1000 tons of TNT = $4.3 \times 10^{12} \; J$) Incidentally, modern H-bombs have energy yields 1000 times as much!

A. $1 \; g$

B. $10 \; g$

C. $100 \; g$

D. $1 \; kg$

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49#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

The kinetic energy of a proton is 80% of its total e)qx, /fm;pwx9 by1ktp nergy. What is the speed of the prot1 ,/kbpq)yt9xpf w x;mon?

A. $0.02 \; c$

B. $0.87 \; c$

C. $0.98 \; c$

D. $1.0 \; c$

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50#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

The kinetic energy of a proton is 80% of its total energy. What is the momentum-g-uv,u htxy4j+yzo pp8i7w4. a 8mzm ivojwzp.ux,mizhg4mt78 8u-y 4 +-apy n $kg \cdot m/s$ of the proton?

A. $5.0 \times 10^{-19} \; kg \cdot m/s$

B. $2.5 \times 10^{-19} \; kg \cdot m/s$

C. $5.0 \times 10^{-18} \; kg \cdot m/s$

D. $2.5 \times 10^{-18} \; kg \cdot m/s$

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51#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

What energy is released (in MeV) during a reactiz/b0 (-d7yb ewc;.yrtse, s. ;dkojvjon in which $1.67 \times 10^{-25} \; kg$ of material is converted to energy?

A. $5.0 \times 10^{-14} \; MeV$

B. $4.1 \times 10^{-7} \; MeV$

C. $3.1 \times 10^{-4} \; MeV$

D. $9.4 \times 10^{4} \; MeV$

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52#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

How much mass is lost during a reag 9ivc9 yos(s:y8kbq4ca;kwb 5jfh66 ction in which $1.7 \times 10^{8} \; MeV$ of energy is released?

A. $1.8 \times 10^{-8} \; kg$

B. $5.7 \times 10^{-9} \; kg$

C. $1.9 \times 10^{-17} \; kg$

D. $3.0 \times 10^{-22} \; kg$

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53#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

What is the total energy of an electron movin;zwrd5nl .71ypu 3-k)bzssppg with a speed of 0.95c?

A. $2.6 \times 10^{-13} \; J$

B. $8.2 \times 10^{-14} \; J$

C. $1.1 \times 10^{-13} \; J$

D. $1.2 \times 10^{-14} \; J$

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54#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

How many joules of energy are required to accelerate one3brth:pumz 9. zndxpi t 431 6:cqsy)d kilogram of mass from rest to a velocity o39d3tqur tzzp: spnxc4.d16b h)y:im f 0.866 c?

A. $1.8 \times 10^{17} \; J$

B. $9.0 \times 10^{16} \; J$

C. $3.0 \times 10^{3} \; J$

D. none of the given answers

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55#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

In a nuclear plant, jp-kfcz-- i /i95cqtsvyji:e6ez+rof z0 2 2 q$1017$ J of energy is available from mass conversion. How much mass was lost?

A. $0.1 \; kg$

B. $1 \; kg$

C. $10 \; kg$

D. $100 \; kg$

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56#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

An electron is accelerated through 100 kV. By what factor has its mass increask1--z pc(had2 m0ik84 8bkwzqt jia*p ed with respect to its rest ma-ab21 (a kkicq*zpz80wkh -4 mipj8tdss?

A. 1.20

B. 1.55

C. 4.25

D. 8.00

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57#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

You are in a rocket traveling away from the Sunttj r(eo2 u8x 0ziwd58 at 0.95c. You measure the speed of ligh 8x8(t o iru5wtejdz20t from the Sun to be

A. 0.05c.

B. 0.95c.

C. 1.0c.

D. cannot be determined without knowing the frequency of the light

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58#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

Two spaceships are traveling through sp i1oi+ns r,oo/ace at 0.60 c relative to the Earth. If the ships are headed directly toward each other, what is their apprr iison+o ,o/1oach velocity, as measured by a person on either craft?

A. $1.2 \; c$

B. $c$

C. $0.60 \; c$

D. none of the given answers

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59#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A fast spaceship is traveling witjch384)l ba hzh a speed of 0.80c. How fast would light travel from the headlights of the shiczlbh) j4 3a8hp relative to a stationary observer?

A. $0.20 \; c$

B. $0.80 \; c$

C. $1.0 \; c$

D. $1.8 \; c$

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60#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A spaceship moves away from the Earth with a speed of 0.80c. Thdy y k 03:w8gsxn4xh)ve spaceship then fires a missile with a speed of 0.50c relative to the spaceship. What is the velocity of the 0 h4)snwg:xy y3k v8dxmissile measured by observers on the Earth if the missile is fired away from the Earth?

A. $0.30 \; c$

B. $0.50 \; c$

C. $0.93 \; c$

D. $1.3 \; c$

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61#

Single-Choice ( 1.0 marks) Whole-Paper View Save Problem

A spaceship moves away from the Earth with a speed of 0.80c. Thnc;qpie zl4)0 e spaceship then fires a missile with a speed of 0.50c relative to th z)nq;lipc 0e4e spaceship. What is the velocity of the missile measured by observers on the Earth if the missile is fired toward the Earth?

A. $0.30 \; c$

B. $0.50 \; c$

C. $0.93 \; c$

D. $1.3 \; c$

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:

Total:61 mks Pass:36.6 mks Duration:Unlimited

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