Gravity and Planetary Motion - 无忧得胜-网上国际课程 (5edu.win)

1#

08.19: Kepler’s Second Law about “kd/k7 ckfj9/ut ye) ,psweeping out equal areas in equal time” can be derived most directly fr) uk/9ck/jfk dte,7yp om which conservation law?

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

16.17:“All planets in the solar system follow elliptical orbits with the Sun *2l wb(axc/k hn:l;fon, b q*alocated at one focus of the ellipse.” This statement is best summarized bw/* alnacnq,l2: hb *xf;(obky which one of the following choices?

A. Kepler’s First Law

B. Kepler’s Second Law

C. Newton’s Universal Law of Gravitation

D. Einstein’s Law of Gravity

E. Schwarzchild’s Law of Orbits

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.21: What happens to the force of gravitatio72h3 zqo ahrl +ze b5px5 /kn)cnf:5ugnal attraction between two small objects if the mass of each object is doubled and the distance between their centers is doublec z5 uaxg/)zb3 5o+nl7 qrh:2pnhk5f ed?

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

95.09 Two spherical bodies attract each other with a gravitational forc-hcf80nn+d9 keb a k,ivl)y x;e of 4.0 N. What will be the force if the distance c ;kfk,na ihn8v0y+e)x-bdl 9 between them is doubled?

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

14.27: Two spherical, non-rotating planets, X andY, hmf:w 1/*mnn oq,vg p;nave the same uniform density. Planet X has twice the radius of ,vf*mnw q p1no: n;g/mPlanet Y. Let $g_x$ and $g_y$ represent the accelerations due to gravity at the surfaces of Planet X and Planet Y, respectively. What is the ratio of $g_x:g_y$?

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

16.46 Two spherical, non-rotating planets, X and Y, have the same uniform desqw fj r7g+6m: ,vw t5b xto:3.bph2gfnsity. Plfgb5s:6q +3v2o jb, .xmrwf7: thwtgpanet X has twice the radius of Planet Y. Let $v_x$ and $v_y$ represent the escape speed at the surfaces of Planet X and Planet Y, respectively. What is the ratio of $v_x:v_y$?

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

01.16: The mass of a planet can be;y: e 9d gxp6yu:+40uq giuqdo calculated if it is orbited by a small satellite by setting the gravitational force on the s u:uey q:+9o u4dp06ygqigdx;atellite equal to the centripetal force on the satellite. Which of the following would NOT be required in this calculation?

A. the mass of the satellite

B. the radius of the satellite's orbit

C. the period of the satellite's orbit

D. Newton's universal gravitational constant

E. all of the above are required for this calculation

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.11: Assume that the Epd x4la d9r/y* ,u9 5u8i.zjbv3. r3rhqak pbxarth attracts John Glenn with a gravitational force F at the surface of the Earth. When he made his famous second flight in orbit, the gravitational force on John Glenn while he was in orbit was closestrp9.l3u8/,r zak iuj*953 y pq hbra.dvx4d bx to which of the following?

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

14.30: Considering only the Moon-Earth syv ubt7 tt7z *o51)ns9qf mw,trstem (ignore any influence of the Sun), which one ,7 owbt7vt9) 1tz5m*qfut rsnof the following best expresses the magnitude of the Moon’s acceleration about the Earth?

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

02.19: As a rocket blasts away from the earth with a iwet//n4o)qev840t1jr geaxw33 ozgcargo for the international space station, which of the foll3e e1rg04 o3tvw gx/oz w4qi/)ae8tjnowing graphs would best represent the gravitational force on the cargo versus distance from the surface of the Earth?

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.33: One object at the surface of the Moon experiences the same gravitativ *):,; 6pcwwwpjdkyional force as a second object at the surface of the Earth. Which of thepw)i w dv ;jw:p,*y6ck following would be a reasonable conclusion?

A. both objects would fall at the same acceleration

B. the object on the Moon has the greater mass

C. the object on the Earth has the greater mass

D. both objects have identical masses

E. the object on Earth has a greater mass but the Earth has a greater rate of rotation.

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

00.24 Consider an object that has s ,xqg* :r9pyya mass, m, and a weight, W, at the surface of the moon. If we assume the moon has a nearly uniform density, which of the following would be closest to the object’s mass and weight at a distance halfway betwyrx*,yg9p qs: een Moon’s center and its surface?

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

96.23: A hypothetical planet has seven times th-wbj;5-lscn -cfyru3:j w o- ge mass of Earth and twice the radius of Earth. The magnitude of the gravitational acceleration at the surface of this pla--jj3u 5w- n- sgyo ;cfr:lbwcnet is most nearly:

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

98.24: A planet has a radius o s,4 ofd..q5z yj:yakkxwc 4srs.q4( jne-half that of Earth and a mass one-fifth the Earth’s mass. The gravitational acceleration at the surfacec a4(4:j4.dz sfyyswxqojqs. r k,5k. of the planet is most nearly

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

08.38: Akg 1200 satellite orbits Planet):hpvg ga -vz:m o m3/mqq,dc- X in a circular orbit with a constant speed of 5,000m/s. The radius of orbit is 7,500,000 m. What is the magnitude of the gq mgah:mczdvqm -g)v,o /3p :-ravitational force exerted on the satellite by Planet X?

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

94.34: A hypothetical planet orbits a star with mass onqa iesam7+g ,+- 4ixwv,v :zole-half the mass of our sun. The planet’s orbital radius is the same as the Earth’s. Approximately how many Earth years does it take for the planet to compxiivwe+a,:- mas7 + o4vgzl q,lete one orbit?

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

97.12: Two artificial sa6no0efq i-pao 6j8 7adtellites, 1 and 2, are put into circular orbit at the same altitude above Earthaof60 - 87 donqa6jepi’s surface. The mass of satellite 2 is twice the mass of satellite 1. If the period of satellite 1 is T, what is the period of satellite 2?

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

15.22 Satellite 1 makesy+. (mun* tje t)1-ad9smdxvdre. o.h a circular orbit around the Earth with a radius $r_1= R$. Satellite 2 makes a circular orbit around the Earth with a radius $r_2= 2R$. We let v represent the speed of a satellite and a represent the magnitude of a satellite’s acceleration. Which one of the following choices gives the correct relation between the speeds and accelerations of the satellites?

A. $v_2=\frac{1}{\sqrt{2}}v_1,a_2=\frac{1}{4}a_1$

B. $v_2=\frac{1}{2}v_1,a_2=\frac{1}{4}a_1$

C. $v_2=\frac{1}{\sqrt{2}}v_1,a_2=\frac{1}{2}a_1$

D. $v_2=\frac{1}{2}v_1,a_2=\frac{1}{2}a_1$

E. $v_2=v_1,a_2=\frac{1}{2}a_1$

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

98.33: In the following problem, the word “weight” rg7ypw51n ( ,76ws9px ku,fcyuq b fzz8efers to the force a scale registers. If the Earth were to stop rotating,y wk7f ,581cq6u ,xw(7 sugzz9ppy fbn but not change shape,

A. the weight of an object at the equator would increase.

B. the weight of an object at the equator would decrease.

C. the weight of an object at the north pole would increase.

D. the weight of an object at the north pole would decrease.

E. all objects on Earth would become weightless.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

10.42: A comet movess /o,fxt twogg,m frq2(8e8 )w in an elliptical orbit around the sun. As the comet moves f 8gof )xm(tw,e gtowqf8s2, /rrom aphelion (the point on the orbit farthest from the sun) to perihelion (the point on the orbit closest to the sun), which of the following results is true?

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

17.48: In the binary star system shown, the two stars followz.tazc591pct pzw60a circular orbits about the system’s center of mass. The stars are separated by a distance D that is large compared to their size and are subject only to their mutual gravitational at50zzwc c9.1tz ap ta6ptraction. The orbital period of the star of mass M is T. Which one of the following choices represents the total mass of the binary star system?

A. $\frac{π^{2}D^{3}}{5GT^{2}}$

B. $\frac{4π^{2}D^{3}}{5GT^{2}}$

C. $\frac{4π^{2}D^{3}}{GT^{2}}$

D. $\frac{16π^{2}D^{3}}{5GT^{2}}$

E. $\frac{25π^{2}D^{3}}{4GT^{2}}$

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.50: A rocket is in k( a(k l23 c84krwuytua circular orbit with speed vand orbital radius R around a heavy stationary mass. An external impulse is quickly applied to the rocket directly oppk 82 t(4 aywk3urcu(klosite to the velocity and the rocket’s speed is slowed to v/2, putting the rocket into an elliptical orbit. In terms of R, the size of the semi-major axis a of this new elliptical orbit is

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