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PRACTICE：Physics Unit26: Special Theory of Relativity

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Author: physics Total Marks: 61 mks Marks Awarded: _____________

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1#

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

You are riding in a spaceship that has no windows, radios, or other means fe yj5m0ql*p*0h zcw:;meiu,sor you to obzum 5,p i;ceq0wly*mh: e 0*jsserve 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 exper8e(90 aum4wr sqgr,tvf yr,)jiment 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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3#

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

Michelson and Morley concluded from the results of their exfotrq1 z49ii5 a /hxu2periment 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 interferometer yourself if you use the following comppy( )7-t dwkt2jmyvn+onents:

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 pit 3xiqx,( d1m;+ *yeun20y1lpo sxwbrinciple.

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6#

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

State the three unprovable assumptions of Ga43xrp o8jb8*7gq oayt lilean-Newtonian relativity.

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7#

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

The theory of special relativ(y+k )cl:rn3 v;i sgxrity

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 formulatkkwz: tu) b0ha-)bqk z,; ,qpving the special theory of relativity was that the laws opw, kktb hv:u)kbq; ) z0zq,a-f physics 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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9#

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

State the first postulat hpday ijb5,3/y8t0fse of special relativity.

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10#

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

State the second postulate /ph3)yxa d (liof special relativity.

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11#

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

If you were to measure your pulse rate while in a spacesc;uq8du) )fs ghip moving away from the Sun at a speed close to the speed of light, you wou)qcd;f 8sguu) ld 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 0 ,o 2j,nls0xii 0v9nehb7cy wobserver, 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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13#

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

The gamma factor is defined as k;qmpylm u;hf 2m,*k 4$\gamma = 1 / \sqrt{1- (v/c)^2}$, 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 ylw2 b5.tpf;eship traveling at a very high speed to a distant star and back again, wh .5;yleb tpfw2ile 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 obso)p z e5j3;hny4rd8oo+xg qa*erver, 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 ibp04z1vf * dphts length with a velocity that approaches the velocity of light. The width of this object,d*p1vp 04hbf z 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 direction parallel to its length with a veloci3 r4;f5vq8 6el bs*iy kqsbg9uty that approaches the velocity of light. The lengtul q 6 vks34ebgf* 895qyirbs;h 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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18#

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

As the speed of a partic oatozhd1:61): xmlxyle approaches the speed of light, the mass of the particlemx1zxhydol 6 )o::a1t

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 approachlv*va oiq+-v(,; v alpes the speed of light, the momentum of the partlopv(+ia lav *,-v;q vicle

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 speed.jky o1grzq/:n(0acky+85hj p As it passes, you measure its length at 8g j0naq j1rz: k/5( yoky+pchone-half its normal 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 a speedy proton when its relatiygghvef7 6ogvh56e;- .no yk0 m.bc4 vk6p3 efvistic mass doubles6okc3keg 6gy-vv.o5n7p ev b e;fg.64 fy 0hmh?

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 relipa)k3. 91lequy.jx 3y1gxuzativistic energy of a speedy proton when its relativistic mass di1le p)zj3. 91 auxqug.xk yy3oubles?

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 of maqc czbop qd3(x:)lt4g d yg524w b)sr4ss $m$ 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 spaceships, each trarocvq2yy+0g:,1h*x7k /h 9wvgv eg c bveling at 0.50c in a straight line. Ship A is moving directly away from the Sun and ship B is approaching the Sun. The science off v hqe0g:oybv* ,y kx97+/1chcg2wrgvicers 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 obseqp z0+ *ywl*fad/b go r+p8*thrver's frame of 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 increase56xs gc2f5 bya00r bo.vhqpfi j45 bt*s, you would 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, relativei,jc xf 7c*rk 0tbil)(kvn+/ywx4oa 4 to the shore, does it move in a river that is flowing at 1.0 m/s if the boat is heading upstrek4)f jyxk0o +vlc/wb4it,ai 7 c rn(x*am?

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/s in still water. With what speed, relatm tr dasp5dp2:b4ui/5 ive to the shore, does it move in a river that is flowing at 1.0 :/rmipa4bdu st5d 2p5 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 still water zg *nmu9s x06+*vd/usxsbyl(. 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 9ld uvnxsb(*y6s /z* umsgx+0heading straight 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 travel if it is;ts /o1-:oqj yhpawk(a:r*ws to be observed by a stationary observer as running jkr;a-ysh : twp/ 1( q*wsoa:oat 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 planet and returns in 10 3)4sflya x/*qrt 8h0m nqi9hp hours accordin*ims t9a 3 4 lh0ynq)p8/qrhxfg to a clock on the spaceship. If the speed of the spaceship is 0.80c, 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 Courtney, are initially 10 years old. While Courtney2xw0uf7t2 m od9r7r/ ngu+0 o +m 1nquiwu8mdh remains on Earth, Andrea rides on a space ship which travels away from Earth at a speed of 0.6c for five years (as measured by Courtney), then turns around and comes back at 0.6c. When Andrea returns, Courtney is 20 years old. 9fiu 2gu0tn+mow/ u1n7mm hduxo8d70 2rrqw+ 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 brother takes a space trip with a speed of 0.80c foriqe -dq**d)f g 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-*)iqfde dq*g brother?

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 s) fxuva czsq,*d 32(ia speed of 0.80c. What is its length?

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 m)4 ( p0((yqujozjijlm ove to contract to half of its proper length (as obs(yqm0j)o4j(i u zp(j lerved by a stationary 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 x(,ws8l0qf5e9wx kz r 10 m when it is at rest. If the spaceship travels by you z 5se xr fq0(,ww8l9kxwith a speed of 0.70c, what length 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 ouka3:k8v aqfty1 zd 79 8gwlae-r solar system is Alpha Centauri, which is 4.30 light years away. A spaceship with a constant vaaa1 w d37g- :kzfy8ktl89qespeed of 0.800c relative 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 solarqiyz+-z4s id4b0w:zfj rb f-. system is Alpha Centauri, which is 4.30 light years away. A spaceship with a constant speed of 0.800c relative to the :yrq0iz bzi44.db js-- w+ ffzEarth travels toward the star. How much time would 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 Centauri, which nu2e24m2 dccvis 4.30 light years a4c2c u 2mvnd2eway. A spaceship with a constant speed of 0.800c relative to the Earth travels toward the star. How much 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 at 0.85c. What is its mass? (The ugv jq;y96q1q 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 mass is twice its ressw7.; e ;hsdh1 q0*/zvypo 9b3 jsjfrjt 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,8/dmm.t tqe sths,y;6mw al+ 1l ka9l- then your mass will ieyl 81tm,wqlatsm-as/h d; lt6k9+ m.ncrease 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 momentum in +8/ )yms dqvzu$kg \cdot m/s$ 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 losesp4 dsi22sc 0fst2/tbvdae uee00z 9n 7 $4.8 \times 10^{-28} \; kg$ 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 re.+eqox4o2 :1m iozcoa9a*u ti leased if 2.0 kg of material was lost during a reaction?i eo:1xaa+ i4u*q .9o 2zocomt

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 mass at rest*u q7,fan gdq* 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 5a-gnwjmt* + uon Nagasaki in 1945 killed 140,000 people, helping to*jat gunw+-m5 end World War II on the next day. It released energy equivalent to that of 20,000 tons of TNT explosive. 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 totjg+ eb64uv8ezal energy. What is the speed of the protoub46ze+je8g v n?

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 p6po3 98 zg 1holcjq;cyn4;zkproton is 80% of its total energy. What is the momentum in ; 69z hlqp;okc1gc jnpy4o3z8$kg \cdot m/s$ 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 releaso x q68lcv(bpof46v6ged (in MeV) during a reaction 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 reaction in which335yo rv(qgk6* epxsm $1.7 \times 10^{8} \; MeV$ 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 a)13wezibq c. j-oafx (n electron moving 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 one kilogram of mass frouwl)k(dq,,( hk.r lv*taol4 fm rest to a velocity of 0.8v lo(hl.)dk4 r(kwlq au,ft*,66 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, +c c c*sqcc/x2$1017$ 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 nt9 8s:89yd(bfpb fie factor has its mass increased with respect to its rest ma:y9 df fb(8ptnib e89sss?

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 fr6v1rk 5 8h) nxrxm(k++ gsqzhjrllu*9om the Sun at 0.95c. You measure the speed 9h 1nkhrxlqgv(z +k mr jrl8+6*x5su )of light 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 space at 0.60 c relative to thnwxx .el9 gj/hr.)jr*37ewz3vhti3 yomm/8 ee Earth. If the ships are headed directly toward each other, what is their approach velocity, as measured by a person on eithert w3yjizo3j/ee8 errh mn9.m3/gx*hwvl).x7 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 with pexib-9hn/7uodj; n05 )skir a speed of 0.80c. How fast would light travel from the headlights of the ship relative to a 5 he 7no9in)-bi/ku;drps x j0stationary 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. The s23mxtn)bu e.vd,k+,p9i de a,o in 1jopaceship then fires a missile with a speed of 0.50c relative to the spaceship. What is the velocity of the missile measured by observers on the Earth if the missile )b,u, dt1x nekjm, a .v2n9o3 epodi+iis 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 tkk:,/ cflcrwz 9k :s0phe Earth with a speed of 0.80c. The spaceship then fires a missile with a speed of 0.50c relative to the spaceship. What is the velocity of the missile measured by observers on the Ear:9k k ,r/0:lpcsfwc zkth 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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