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

1#

08.19: Kepler’s Second dd:6oj: ir* khp:3apu Law about “sweeping out equal areas in equal time” can be derived most directly fro pa3jdd:o6h:* iru kp:m 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 inr t;; *) jrceevqwr:w1 the solar system follow elliptical orbits with the Sun located at one focus of the ellipse.” This statement is best summarized by w*1:r;tj)ew;erqv rw chich 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 gravitational attraction between two l.3biok *:q83xr ozb ajhx9d-small objects if the mass of each object is doubled and the disti qld j k9b*8xrzbo:aox3h3.-ance between 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 bodiesv+nc 5/ly34ryd hq9 px attract each other with a gravitational force of 4.0 N. What will be the force if the distance between them 3/yn9 5 +xyvprq4lhcdis 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 td7 teih/ 2fm/nhe same uniform density. Planet mh27t/f dein/X has 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,uls 7(t n0i 9njoein0-rotating planets, X and Y, have the same uniform density. Planet X has twice then9 uj i,0sn0le7i ot(n 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 orbd2e2at(f+g*nvd,v rc itm h/* ited by a 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 required in this c*d +,vve/chrnt m t(i *dfg2a2alculation?

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 attracyorqx+upwne.1x)s; 5a 6u4a e ts John Glenn with a gravitational force F at th5w+o4r 61 u xaseaeyn;)uq.xpe 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 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 system (ignore any influence of the Sun),kju4fqo-. u08x(sxk6y s b/oh which one of the following best expresses the magnitude ofx. 8-4ojsqosuyk 6 (kbh x0u/f 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 wit:pbpxf .h 44kbh a cargo for the international space station, which of the following graphs would best represent the gravitational force on the cargo versus distance from the surface of the Earth? f.:4 pk4hp xbb

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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 ekb0l3vdjuk2g1 tw-1j qd -mv3xperiences the same gravitational force as a second object at the surface of the Earth. Which of the fo-g0jj1 tk2kb d3md13v-l wqv ullowing 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 j, am/uk9isoje k,;:k c t073b)ercl pb3:dxlmass, m, and a weight, W, at the surface of the moon. If we assume the moon has a nearly uniform density, which of the followinga cxk3pt l;md: cko, is3le ,e:0/bbjr9j)uk7 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 timjmsq1hx cn3 5)i69mqxes the mass of Earth and twice the radius of Earth. The magnmjc63s1iq 9)hnmxqx 5itude 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 radiu -uj*ln+m-d fss one-half that of Earth and a mass one-fifth the Earth’s mass. The gravitational accelerat fj* nmu-ds+l-ion 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 Plan( ooliu3umws,9+yv r,et 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 magm+3,i w r uls(o9,yvounitude of the 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 star with mass one-half ;8i wvlgj+dtu1p77yw3jto2v the mass of our sun. The planet’s orbital radius is the same as the Ear7 j ;8+vi2twvw dgtop7ujl31yth’s. Approximately how 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 satellites, 1 and 2, are put into circular orbit at/ixe1. tp/p6pmtj abb0,+ vqt the same altitude above Earth’s surface. The mass of satellite 2 is twice the mass of sa pjbxmbqp e+//01tv,tt6ip. atellite 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 Earth with a radiuxhfb e7/r 24dgw9t:bgs $r_1= R$. 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” refers to the forceofutfxf hj,6f95p od75 (r7qu a scale registers. If the d5f, fufuh5trox jfq7 9op(76 Earth were to 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 elliptical orbit around the sun. As the comet mov 0ip2/ eburt4jes from aphelion (the point on the orbit farthest from the sun) to perihelion (4ijru0/b2te p 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 stacppkm34 21mfnr aot0/m )duo 2r system shown, the two stars follow 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 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 sy/o1nrma o0 uk4 d223m)mptf cpstem?

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 8c9t c7v )ml*0p1rykwqi as: horbit with speed vand orbital radius R around a heavy stationary mass. An external impulse is quickly applied to the rocket directly opposite to the velocity acc0 k lthyq98 :v7 p1ws)iar*mnd 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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