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 areas in v1b+* * w;ea48ropt5 qar dqenequal time” can be derived most directly from which coqnw8t+a5vdbra14rq *e; e o*p nservation 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 el.(oehqs/p:)hk iw) k nv t.y9gp;gs z/liptical orbits with the Sun located at one focus of the ellipse.” This sta/e;:gk htnp(qv.y).o gip/)z 9ss wh ktement 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 gravitational attraction between twfg ;60vab b rv2/y;gg9ahp *rlo small objects if the mass9vrg;v0gflbpa/rya2 * gh;6b of each object is doubled and the distance 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 bodies attract each other with a gravitational for 11vn0x 38khqp(gx ljpce of 4.0 N. What will k pg3 8lh(1x xq10vjpnbe the force if the distance 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 planetsm)+ yhgg8rra -8zcvl1lw m(0w, X andY, have the same uniform density. Planet X has twice the radius 1l(gz vg)l-a0hm 8cw m+ wyrr8of 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, (: zlfce.vswn4 qzbr:ys,ma( 9yk)h0 X and Y, have the same uniform density. Pkr:ewc)(nyv09(m:f hsqy,a . szz b l4lanet 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 che(5q7un+ aj c z aj:)k8duv3jan be calculated if it is orbited by a small satellite by setting the gravitational force on the satellite equal to the centripetal force on the satellite. Which ofa)e azn kdqj5(3hjjvuu8 +c7: 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 attracts John Glenn with a gravitationwo gt34p4bp. 3smyjn9al force F at the surface of the Earth. When he made his famous second flight in orbit, the gravita49sobp twp34gm3njy. tional 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 t, dus p n)unel6ns6haoa4,2:w1zr0e (ignore any influence of the Sun), which one of the following best expresses42hanen ,o u n6rdwe)lsua,160s:pzt 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 1je( wffsk4*j away from the earth with 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 fs1j k 4e(w*fjEarth?

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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 gravi2/i* qatska 7jtational force as a second object at the surface of the Earth./j akas*q7 2it 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 srhqg6gk7 , b1vurface of the moon. If we assume the moon has a nearly uniform density, which of the following would be closest to thvgbr ,k h71g6qe 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 the mass of Earth and twice the rccszn5s, +/efadius of Earth. The magnitude of the gravit5c ncef +s/z,sational 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-half that of Earth and a mass one-fibv ik-iz;p0goutyi5d7*a ov su.+37 wfth the Earth.z +otu-s;p5vk0ouwa i3 7 vg7iibd *y’s mass. The gravitational 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 witp eu0 yp0 v,25b i h1uy58ic;puqg)n nrrfm8v5h a constant speed of 5,000m/s. The radius of orbit is 7,yf85 i)80n20yubp5nurirgvcvu; ep mq, 5p h 1500,000 m. What is the magnitude 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 wi1ydxkwb hoc()b8/ d/u th mass one-half the mass of our sun. The planet’s orbital radius is thdu 1ho(bdb/c/x8wyk)e same as the Earth’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 inn9 m ;ou*gw7blto circular orbit at the same altitude above Earth’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 satgmub7*9 nwl o;ellite 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 mapxde:7p36uz x kes 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 t4 xn;z q2byxkp6d ;)elz5.zu word “weight” refers to the force a scale registers. If the Earth were to stuy 6k.qt;;znx lzz)pexd245b op 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 e 1+ 04c bss8oi8fxt ivs-likj9pj, 9gdlliptical orbit around the sun. As the comet moves from aphelion (the point on the orbit farthest from the sun) to perihelion (the point on the orbit closest to the sun), which of the folloj1t 8-lb9ojssd+,g49i i8vif pscx k 0wing 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 orbits7sw v u/ kt+o)08znjrr*9y ugo urm4y8 about the system’s center ofrur4uyw7rk s)g8o+juoyntv 9* 8/z 0m 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 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 around 0(::cdm oexuq6fmi,o( s9xua 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 an elliptical orbit. In terms of R, the size of the sem(oxam :9cd qsm,oif ux(e:u6 0i-major axis a of this new elliptical orbit is

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