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 equal time”puttnsxia /( . m27pa6 can be s2ttum(6aai 7 xn./pp derived 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 orbi):kq/ve e62vq-ai vt dts with the Sun located i):d2a-evv evqt qk6/at one focus of the ellipse.” This statement 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 two sma:1wa+b9+;lz sheluh yll objects if the mass o9e+wbhh:;lls+y u1azf 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 wi4gqk m9eye4; ith a gravitational force of 4.0 N. What will be the force ife44e; qy9 mkgi 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 planets, X andY, have the same u0d.i(bhj tk *aniform density. Planet X has twice the ika jb.td(*0hradius 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 gwqtr6 i0( eqmf 4.p5rm; xg*qdensity. Planet X has twice the radiu(.rxmw g64pqmt 0gqf 5;*e rqis 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 sls9 ,,p-mb wezmall 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 calculation?b9w-,z,slp e m

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 gravitational force 2jlj11qy1btg p/5ebrF 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 orbiterqybl g151 jt2bj/1p 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 only2q z0 sx ns gvm0 g8hv.sww97i;2a3/hvt9mfxk the Moon-Earth system (ignore any influence of the Sun), which one of the following best expresses the magnitude of the Moon’s acceleration about the Eart;8ss0hiw.vmw 9/x7 2hv3g s2zkqxavtf0mg 9 nh?

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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 blast1e1 wsmouf;w 5s away from the earth with a cargo for the international space station, which of the esf5 u1o;ww1mfollowing 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 i(ga7ay53mv2 2uy mrlthe surface of the Moon experiences the same gravitational force as a second object at the surface of yg (lmma7 v3iru5ya22the 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 ty cx7nwjr);q l1nyf- 6he 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 between Moon’s center a jn7cqyfnr-61ly );x wnd 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 Eat8l-vm/js d rvk +/6pyrth and twice the radius of Earth. The magnitude of the gravitational acceleration at the s/y6pjd8+v t ls mrkv-/urface 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 m-g) 9smx*hv p+vnjf 2:wukc z4ass one-fifth the Earth’s mass. The gravitational acceleh-:2+nz gmj)9kpvcfwus*x 4 vration 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 incu 7o;l,-2cm evthi t( a circular orbit with a constant speed of 5,000m/s. The radius of orbit is 7,500,000 m. What is the mco e- il;hu vc(2,tmt7agnitude 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 /l smwc9*io32too**o nw9ha n planet 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 do*c**osn3ah2w9 io9w mt /lon oes 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 5l.m72sk tn1+l vwvcsat the same altitude above Earth’s surface. The mas+mnlvlc1sv 5t2wks . 7s 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 Eartt1jxzlaxx ajc -;) c.6h 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” refers to thezth *,wlke9m*b 53fyu force a scale registers. If the Earth were to stop rotating, bu3klwuhze t5*y*9 ,fmbt 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 yio2a*r-kqy4z r970 imk)*ftf5x1 iend o0 lm orbit around the sun. As the comet moves from aphelion (the point on the orbit farthesty-ftorkirni*qeo 21l 4x 7f *y0 a0mzdkm i95) 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 s +) f3xkj4ab bv3 wjbdm:s.ct0hown, 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 thb .tj)kc3v+3s0fmx4:wj bdbae 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 orbi;4.mstgh 98b ;e1w:hykxjm/uk fin 6atal radius R around a heavy stationary1g/he8m;jwafxni .4byhkut ;km s9 6: 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 semi-major axis a of this new elliptical orbit is

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