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

1#

08.19: Kepler’s Second Law about 8bb+.cmnm hjsbbxn) 7 ,gc: 1a“sweeping out equal areas in equal time” can be derivebbm)sbb+xhn.cg:7a njm8c , 1d most directly from 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 wity1 dyer h9,gh2h the Sun located at one focus of the ellipse.” This statement is bdegy2yh r,91hest 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 gravitatio,* foy/pwv dy3nal attraction between two small objects if the mass of each object is doubled and the distance betweenf3y dy*/opwv , 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 bodies attract each other with a gravitational forc ltc5nrsw-r 2.a-hjm- du0: wne of 4.0 N. What will be the force if the di:lnm-0- d.rnhu2-c wa5 t jswrstance 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, have the same uniformixfhz ; pn155eo:u6s5x yk a)-lx,zic density. Planet X ha5z :xz)1iou,x 6sh-nlyxk aip5e;f5 cs twice the radius of Planet 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 f+ra kr kk-ib-5;pd72bhc/gldensity. Planet X has twice + k-flgd2rr-bi;k7cbhap 5k/ 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 calculated if it is orbited by a s*vhgxiu ;wt 2p(3ms+ lmall satellite by setting the gri+s(h* ug2lpmv;3xtw avitational force on the satellite 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 Earth h3 msi: qmzt75attracts 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 closest to which5h7t zs:3mqi m 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 system (ignore a md, 5bg(8follny influence of the Sun), which one of the following best expresses the magnitude (g, fo5b8dlm lof 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 cargo for t2+k;zpzqw s:t)o 8wm phe international space station, which of the following graphs would best represent the gravitational o:z)8;zs2k+wmpwp qt 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 sd pta;e 4n8.dexperiences the same gravitational force as a second object at the surface of the Earth. Which of ts a d.4p;e8tdnhe 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 b l/,,z1ptf:k;px gi wa mass, m, and a weight, W, at the surface of the moon. If we assume the moon has a nearly fp1w /kz,g;tp,blix :uniform density, which 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 has seven times theq,n;rkjys p*9 zu y44y mass of Earth and twice the radiuyyjun, y*qkr ;44szp 9s of Earth. The magnitude of the gravitational acceleration at 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-ha7t i: s,vgc6sblf that of Earth and a mass one-fifth the Earth’s mass. The :b tgis7 ,v6scgravitational acceleration at the surface 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 X in a circular orbit with .0fg1ppf* jhba constant speed of 5,000m/s. The radius of orbit is 7,500,000 m. What is the magnitude of the gravitational force exerted on the satelliteg h*jbf1 p.p0f 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 p9xns x :m7yhc3v :4lbri:/wkplanet orbits a star with mass one-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 vck 7:3b:x s/lwhyn4i p:9xmr 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 artificiafsx+3 j6g;jc 6ntrpq 5,fx;nhl satellites, 1 and 2, are put into circular orbit at the same altitude above Earth’s surface. Th66,tgnpx xrnfsh3f; j j5;c+qe 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 makes a circular orbit around the Eart 77aw jo.y0nwrh 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 probleq*9e9 /8lckag ,rfvehlqt;- em, the word “weight” refers to the force a scale registers. If the Earth were to stop rotating, bu99fe *q,q8/l -r; klaceeg vtht 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 elliptical orbit lm*ur;)rk udl*bjm / 4around the sun. As the comet moves from amk)/4 lmbruu*lj;rd*phelion (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 follow circular orbits a o /z c.8qsc en-z5t9vs*cel;i* iwe2lod-: lmbout 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 attraction. The orbital period of the star of mass M is T. Which one of the following choi 2s-z:*mez9tc 8o cewq/vel c;di.in-*ls5loces 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 radiu rltf8.slx69d s R around a heavy stationary mass. An external impulse rs89xd .ft6l lis quickly applied to the rocket directly opposite 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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