Gravity and Planetary Motion - 题库网 (tiku.one)

1#

08.19: Kepler’s Second Leei zx, 2 nsg9gb(,6puaw about “sweeping out equal areas in equal time” can be derived most directly from which conservation lu,e(ni x6,g pesz 29gbaw?

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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 with the Sunl,t 7b;qd2g hxcob7o.3 brny7 located at one focus of the ellipse.” Thbq7b.b o ,ng273;trlyh 7coxd is 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/frh clx6 k64yh wu13rll objects if the mass of each object is doubled axuw6yr31r kc 4f lh6/hnd 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 force0 i:- .xrh(o 8 j:gsifyfxjso66ss8cd of 4.0 N. What will be the forcescxf6 i yjjgso:df . 8s h(-6xri0s8:o 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, no)g /wex/2tl s3t 4lvgqn-rotating planets, X andY, have the same uniform density. Planet X has twice the radius of Planet Y. Leg lv)g qse/ttwl4/ x32t $g_x$ 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 d lb ee/81-d p5qq c4aqjilk::3 ljysl0ensity. Planet X has lqjc5018jyl a bq se:3dk:eqpll-i/ 4twice 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 calcdf0lb0gn o4tg46x5 iqulated if it is orbited by a small satellite by setting the gravitational force on the satellite equal to the centripetal fof6x4 gg dl04b0tinqo 5rce 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 th5cqly0e s z 3iimost6.x38j r3e Earth attracts 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 . i s3xrqt c53lmsyz6 j0io8e3which 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 a7 y (qq-f,oklhszc.j* djtc8)ny influence of the Sun), which one of the following besq7qf8 ,c d j)holszkjtc(.*-y t expresses 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 away from the earth with a+u7r h,1y mea0znm+ db cargo for the international space station, which of the following graphs would best represent the gravitational force on the cargod1,y+e7ha urz mn+b m0 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 experiences the same gravitatit rf. +9bm0yyd6;41 igwwjjur4v6 phdonal f9t;4 uvjyyi.1 pb6w4+w dh j6drgm0frorce as a second object at the 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, y3vj86y yx )xyW, at the surface of the moon. If we assume the moon has a6yyy3yjx 8x)v 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 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 Earth9q5wzzc*xpq (ril1n1 n uyf75 and twice the radius of Earth. The magnitude of the gravitational accn ( yc7p*59q zrfwz1x5uilq1neleration 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 Ear31r; cir.+ husco+ko)pfe( dtoy 0u5 rth and a mass one-fifth the Earth’s mass. The gravitational acceleration at the surface of the plany+) do +t0ick.rpfr( c ;o1shuu oe53ret 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 Planekm*y q( fub(1et X in a circular orbit with a constant speed of 1f(e*mku(b q y5,000m/s. The radius of orbit is 7,500,000 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 stas n lzh20k(,5y +bamjgr 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 fory ,(mksjzh52ga +nl0 b 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 and2dprr6* by n3vs3-fum 2, are put into circular orbit at the same altitude above vmn*-y drf32sr6 bu3pEarth’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 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 arounm8 gwp71l+we j h,ua*k mr5,dtd 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 word “weikibs ay45vl/-b5db+ wght” refers to the force a scale registers. If the Earth wer4lb+5bswi/v- kb yd5ae 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 g;r)7clm1q qesun. As the comet moves from aphelion (the point on the orbit farthest from the sun) to perihelion (the point on the r q lcqe17g);morbit 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 stzy:,j*wz j)k pm0.mrwars 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 ow.mkpzr, jjm wz*) :0yrbital 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 xg fe.-o :kfa*k g9/zerc3g,ugs (pt+ radius R around 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 of3ufak t+gg 9 c.o:ke(sxe* -gr,/ pgzf R, the size of the semi-major axis a of this new elliptical orbit is

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