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

1#

08.19: Kepler’s Second Law about “sweeping out equal area+w-ic h jqt o*vu20)sms in equal time” can be derived most directly from ) so0i j+t mu-vhw*2qcwhich 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 syst 8ef3 liamlnw1;) rd4q1h duk3em follow elliptical orbits with the Sun located at one focus of the ellipse.” This sta )4raknfdi3duqlm1wh l8;31e tement is best summarized by 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 gravita9c t dcnx64pf zcx53q.tional attraction between two small objects if the mass of each object is doubled and the distance bcdc.9z34xc xt p6fq 5netween their centers is doubled?

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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 3g/p rk vz1w:7*gc vbibodies attract each other with a gravitational force of 4.0 N. What will be the force if the di1bpv7 3/ cggrz* vki:wstance 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 ari u6+e/san2ue3 oeper.): vyndY, have the same uniform density. Planet X has twice the radius of Planet Y. Leiu a e eovsr+ery3:2nu/6e.p)t $g_x$ 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)oy-0e hnv)k:3us, av xxfwh/ and Y, have the same uniform density. Planet X has twice the radius of Planet Y. Lxae whx):vv, y-fskn3 uo /)h0et $v_x$ 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 calculated if it is orbited by , w2li jm. :f7chxab /0vj)hwkrp)r/2x) rcvra small satellite by setting the gravitational force on the satellite equal to the centripetal force on the satellite. Which of the following would NOT be ) wx2vj72:phrvih x,rrl0r aw.fj//m )bc ck)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 Earth attracts John Glenn with a gravitatiwblc hv )wu r*kw:buvf)kg 38j 4r,.d;onal force F at the surface of the Earth. When he made his famous;,bc.jk uvr 38)kl bg4hv d fw*w:ruw) second flight in orbit, the gravitational force on John Glenn while he was in orbit was closest 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 only6un)z fycwbt84k 2/ qkhag*:j the Moon-Earth system (ignore any influence of the Sun), which one of the following best expresses the magnitude of the Moon’s acceleratio * ztahkn 6cjybw:qf8g/24k)u n 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 blastshnzk f ynnt4g* 8w:;)c away from the earth with a cargo for the international space station, yhz) f; :t*ngw4kn cn8which of the following 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 q+nrjg2c;rbs;qq. , o2e2y vithe Moon experiences the same gravitational force as a second object at the jo.,brv y2gsec;+q r2nqq2i ; surface of the Earth. Which of the 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 a mass, m, and a weight, W, at the surfacexo+b9-(w flrp:opjl3t 8j5 e ;hml9ej of the moon. If we assume the moon has a nearly uniform density, whic +e5m; p hfe(lljo38ptjr-9jb9:xlowh of the following would be closest to the object’s mass and weight at a distance halfway between 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 hakoh (:/,vh;f 6mtaters seven times the mass of Earth and twice the radius of Earth. The magnitude of the gravitational acceleration at te; f(,/v amtokh6hr:the surface of this planet 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 one-half that of Eaf px:yu v):t l1;un.x)dug8ac rth and a mass one-fifth the Earth’s mass. The gravitational acceleration at the surface of the planet iscu 1:n 8l ;ufu)d ypvtagx).x: 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 X ik ((h rh )t.cxhqnsm:1x8l3kato r e/4n 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 thhke so4 rl)(htqkcxx1. t 8am/r(n: h3e gravitational 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 ,pgskqr b o66yl:0;pbstar with mass one-half the mass of our sun. The planet’s orbital radius is the same as the Earth’s. Approximately hob rpb :qlko,6y0sg 6;pw many Earth years does it take for the planet to complete 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 slfd;a+uz do9tp/+yl q0ov) o9atellites, 1 and 2, are put into circular orbit at the same altitude above Earth’s surface. The mass of satellite 2 is twice the mass of satellite 1. If the f/lodltvud+9+ozp a yq9; o)0 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 makes a cir5/(x u.y-ydd(drhwpq cular 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 prob md /a8+pgt7gklem, the word “weight” refers to the force a scale registers. If the Earth were top dgmk7+ a8/gt stop rotating, 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 moves in an ellipc7-etz. -pontx4qt- g tical orbit around the sun. As the comet moves from aphelion (the point on the orbit farthest from the sun) to perihelion (tttt-c4 pgzno x-.e- q7he 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 follow circulycsv*,c nw+: /1 )k dheuao0trar 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 u c1 a,:syethn0w*k/ crvd)o+ only to their mutual gravitational attraction. 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 a circular orbit with speed vand orbital radius R arm2i ,bg xhb,)3dr -pnwc; ond0 *sg.).z zuezzound a heavy stationary mass. An external impulse is quickly applied to the rocket directly opposite to the velocity and the rocket’s speed is slowed to v/2, putting the rocket into w-)gx3) g . ozrdsdb unz* 2he,zm ci.,b0;pnzan elliptical orbit. In terms of R, the size of the semi-major axis a of this new elliptical orbit is

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