# Why must the centre of the satellite orbit coincide with the centre of the Earth?

25,660 results, page 24

1. ### math

The illustration at right shows a rectangular box, three of whose edges coincide with the coordinate axes, and one of whose vertices is (3, 6, 4). Give an equation for the plane containing the front face of the box. Do the same for the top and right faces.
2. ### physics

A hole is drilled with smooth sides straight through the center of the earth to the other side of the earth. The air is removed from this tube (and the tube doesn't fill up with water, liquid rock or iron from the core). An object is dropped into one end of the tube and just ...
3. ### Physics

A rotating cylinder 7.95 kilometers in radius is designed to be used as a space colony. With what period must it rotate so the residents on it feel as heavy as they would on Earth?
4. ### science

If we drilled a hole straight through the earth, and dropped a golf ball down the hole, starting initially at rest, how fast would the ball be traveling when it reached the center of the earth. The earth’s radius is 6378 km.
5. ### Physics

The average speed of an orbiting space shuttle is 19700 mi/h. The shuttle is orbiting about 125 mi above the Earth’s surface. Assume the Earth’s radius is 3963 mi. How long does it take to circle the earth? Answer in units of h.
6. ### AP Biology

How many joules of sunlight hit Earth per day? I have looked everywhere and can't find an answer!! The sun emits about 4*10^26 Watt. The flux of solar energy at the Earth is thus about: F = 4*10^26 Watt/(4 pi R^2) where R = 149.6*10^9 meters is the Sun-Earth distance: F = 1422...
7. ### physics

the space shuttle typically orbits 400 km above the earths surface. The earth has a mass of 5.98 * 10^24 kg and a radius of 6380km. A) How much would a 2000 kg part for the space station weigh when it has been lifted to that orbit in the shuttles cargo bay? B)Use your result ...
8. ### Physics

A DISTANT SPACE PROBE IS PROGRAMMED TO EMIT A RADIO SIGNAL TOWARD EARTH AT REGULAR TIME INTERVALS. ONE SUCH PULSE ARRIVES ON EARTH 2.92S AFTER IT IS EMITTED FROM THE PROBE. WHAT IS THE APPROXIMATE DISTANCE FROM THE EARTH TO THE PROBE? A) 7.4 X 10^8M B) 8.76 X 10^8M C) 6.94 X ...
9. ### science

1.why is freshwater a limited resource? a)because most water on earth is in lakes** b)because most water on earth is in clouds c)because most water on earth is in the ground d)because most water on earth is salt water
10. ### Math

You are in a car of a ferris wheel. The wheel has a radius of 8m and turns counterclockwise. Let the orgin be at the center of the wheel. Begin each sketch in parts a) and b) when the radius from the centre of the wheel to your car is along the positive x-axis. a) Sketch the ...
11. ### physics

A rocket carrying a satellite is accelerating straight up from the earth's surface. At 1.20 after liftoff, the rocket clears the top of its launch platform, 68 above the ground. After an additional 4.85 , it is 1.50 above the ground.Calculate the magnitude of the average ...
12. ### physic

I don't understand this question at all. If you want to see the figure, let me know The figure below is a scaled representation of a planet's orbit with a semimajor axis of 1.528 AU. (Use the exact values you enter in previous answer(s) to make later calculation(s).) (a) Find ...
13. ### Gen Chem

Which of the following conditions MUST be true for the entropy of a pure solid to be zero? a) T must be 0 K b) The solid must be crystalline and not amorphous c)the solid must be perfectly ordered d) the solid form must be an element
14. ### Physics

In Stranger in a Strange Land, Robert Heinlein claims that travelers to Mars spent 258 days on the journey out, the same for return, \plus 455 days waiting at Mars while the planets crawled back into positions for the return orbit." Show that travelers would have to wait about...
15. ### physics

The average speed of an orbiting space shuttle is 20100 mi/h. The shuttle is orbiting about 196 mi above the Earth’s surface. Assume the Earth’s radius is 3963 mi. How long does it take to circle the Earth? Answer in units of h ( hours)
16. ### ap physics

(a) Calculate the angular momentum of Earth that arises from its spinning motion on its axis, treating Earth as a uniform solid sphere. J · s (b) Calculate the angular momentum of Earth that arises from its orbital motion about the Sun, treating Earth as a point particle. J · s
17. ### physics

1. It has been suggested that rotating cylinders about 11 mi long and 5.2 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall acceleration on Earth? 2. If ...
18. ### Physics

The average distance separating Earth and the Moon (center to center) is 384 000 km. Use the data in Table 7.3 to find the net gravitational force exerted by Earth and the Moon on a 3.00 multiplied by 104 kg spaceship located halfway between them (Earth mass kg: 5.98 x 10^24, ...
19. ### Science

I would really appreciate it if someone checked my answers and told me if they were right. Thx. ~Ashley 1. Which of the following determines the strength of the force of gravity between two objects? Check all that apply. A: The speeds of the objects. *B: The masses of the ...
20. ### astronomy

Using the densities below, find what percentage of the Earth's mass is contained in its core. If Earth's core were adjusted in radius so that the core contained forty percent of the mass, by what factor would the radius of the Earth change compared with its actual radius? (...
21. ### English

Is there a way to express the verb 'must' such that it means the subject does not have to do something? See: I must go. -- I have to go. I must not go. -- I have to avoid going. I can't think of any 'must' equivalent to "I do not have to go". Is it conventional to use 'must ...
22. ### Astronomy

Consider the same asteroid initially in the asteroid belt at a distance 3 AU from the Sun, and 2 AU from Earth, which collides with Earth. As it falls towards Earth, it acquires kinetic energy (neglect its initial motion) both by being accelerated towards the Sun and towards ...
23. ### Physics

The average energy flux in the sunlight on the Earth is ⟨S⟩=1.4×103 W/m2. You might need to use some of the following constants: Distance from earth to the sun=AU=150×109m REarth=6.4×106m RSun=7.0×108m G=6.67×10−11m3/(kgs2) MEarth=5.97219×1024kg MSun=...
24. ### physics

you weigh 526 N on earth. Planet X has twice the mass of Earth and twice the radius of Earth. What is your weight in newtons on planet X?
25. ### 12th

an electron above the earth is balanced by the gravitational force and the electric field of the earth. find the electric field of the earth.
26. ### science

Mass of a body is 25 kg. What is its weight in Newton on earth? The body is carried to a planet whose mass is two times the mass of earth and radius is half that of earth. What will be the mass and weight of the body on the planet? (Take the value of g on earth as 10 m s–2)
27. ### Math

Can You help me with this question? The distance from the earth to the sun is about 1.5 X 10^8 km, while the distance from the earth to the moon is about 3.8 X 10^5 km. If a scale model of the solar system is constructed so that the distance from the Earth to the Sun is 100 ...
28. ### Math

The weight W of an object varies inversely as the square of the distance d from the center of the earth. At sea level (3978 mi from the center of the earth), an astronaut weights is 110lb. Find her weight when she is 459 mi above the surface of the earth and the space craft is...
29. ### Physics

The density of the Earth, at any distance r from its center, is approximately (14.2-11.6(r/R)*10^3) Kg/m^3, where R is the radius of the Earth. Show that this density leads to a moment of inertia I = 0.330MR2 about an axis through the center, where M is the mass of the Earth. ...
30. ### physics

A spaceship travels with a speed of 0.3c as it passes by the Earth on its way to a distant star, as shown in the diagram below. The pilot of the spaceship measures the length of the moving ship as 40 m. 0.3 c Earth Determine its length as measured by a person on Earth. Answer ...
31. ### Physic~~~

Saturn has a radius of about 9.0 earth radii, and a mass 95 times the Earth’s mass. Estimate the gravitational field on the surface of Saturn compared to that on the Earth. So I was doing this and I got stuck here; gs = G*Ms/Rs² = G*(95Me)/(9²Re²) = ge*(95/9²) = 1.173*ge...
32. ### Physics

the hubble telescope has a mass of 1.5 x 10^4 kg and its orbiting the earth 596 km above the ground surface.the earths radius is 6.38 x 10^3km. CAlculate a)the force of gravitation on the telescope due to the earth's pull. given: G=6.67 x 10^-11Nm/kg and the mass of earth is 5...
33. ### COMP 155

When writing a paragraph, it is important that the topic sentence and supporting points within that paragraph be directly related. What would be the reaction of a reader if the topic sentences in an essay did not coincide with the supporting points?
34. ### COM/155

When writing a paragraph, it is important that the topic sentence and supporting points within that paragraph be directly related. What would be the reaction of a reader if the topic sentences in an essay did not coincide with the supporting points?
35. ### Comp 155

When writing a paragraph, it is important that the topic sentence and supporting points within that paragraph be directly related. What would be the reaction of a reader if the topic sentences in an essay did not coincide with the supporting points?
36. ### Physics

Relative to the center of the Earth, the position of the Moon can be approximated by (t) = r [cos (ωt) + sin (ωt) ], where r = 3.84 108 m and ω = 2.46 10-6 radians/s. (a) Find the magnitude and direction of the Moon's average velocity between t = 0 and t = 3.12 ...
37. ### phy.

Larry weighs 300 N at the surface of the earth. what is the weight of the earth in the gravitational field of Larry? -force= GMm/d^2 would i set it up like force= (9.8m/s^2)(300 N)? an astronaut lands on a planet that has twice the mass as earth and twice the diameter. how ...
38. ### science

Multiple Choice 1. Which of the following terms refers to an object that orbits the sun and has enough gravity to be spherical but has not cleared the area of its orbit? (1 point) comet asteroid dwarf planet planet 2. Which of the following statements about the solar system’...
39. ### ms. sue

Multiple Choice 1. Which of the following terms refers to an object that orbits the sun and has enough gravity to be spherical but has not cleared the area of its orbit? (1 point) comet asteroid dwarf planet planet 2. Which of the following statements about the solar system’...
40. ### Physics

Assuming that the Earth is spherical and recalling that latitudes range from 0° at the Equator to 90° N at the North Pole, how far apart, measured on the Earth's surface, are Copenhagen (55.67° N latitude), and Rome (41.90° N latitude)? The two cities lie on approximately ...
41. ### Physics

The Earth's rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2006 the Earth took about .840 s longer to complete 365 revolutions than it did in the year 1906. What was the average acceleration of the Earth during this time? Give ...
42. ### algebra

You must submit your response as a file. An object’s weight depends on its height above the surface of the earth. If a man weighs 190 pounds on the surface of the earth, then the man's weight in pounds (W) x miles above the surface is approximated by the formula: W = (190&#...
43. ### PHYSICS

THE MASS OF VENUS IS 81.5% OF THE EARTH AND ITS RADIUS IS 94.9% THAT OF THE EARTH. A)COMPUTE THE ACCELERATION DUE TO GRAVITY ON THE SURFACE OF VENUS FROM THESE DATA.B)IF A ROCK WEIGHS 75.0N ON EARTH,WHAT WOULD IT WEIGH ON THE SURFACE OF VENUS?
44. ### Math

The radius of Earth is 3,959 miles. A spacecraft orbits 6 miles above the surface of Earth. The spacecraft completes 220° of a revolution around Earth in one day. What is the average speed of the spacecraft?
45. ### science

a crew of astronauts leaves earth on a Monday , lands on the moon on a Thursday. they and on the side of the moon facing away from the earth. on what day would the astronauts be able to see earth from the moon, explain
46. ### Critical Thinking

When the interests of politicians or big business moguls coincide with those of the masses which of the following is the consequence? coverage of events will be leaked coverage of events will be automatic coverage of events will be cancelled coverage of events will be slanted...
47. ### physics

How far from the center of the earth must a person be to experience acceleration due to gravity that is one half the acceleration at the surface?
48. ### Physics Classical Mechanics

The mean distance from the center of the earth to the center of the moon is rem = 3.84 × 108 m. The mass of the earth is me = 5.98 × 1024 kg and the mass of the moon is mm = 7.34 × 1022 kg. The mean radius of the earth is re = 6.37 × 106 m. The mean radius of the moon is ...
49. ### physics

A projectile with mass of 139 kg is launched straight up from the Earth's surface with an initial speed vi. What magnitude of vi enables the projectile to just reach a maximum height of 5.8RE, measured from the center of the Earth? Ignore air friction as the projectile goes ...
50. ### Physics

Sally has a mass of 50.0kg and earth has a mass of 5.98X10^24kg. The radius of earth is 6.371x10^6m. A)What is the force of gravitational attraction between sally and earth? B)What is Sally's weight?
51. ### Math

The diameter of Earth is about 8,000 mi. Suppose a jet is traveling around Earth at an altitude of 30,000 ft. How many miles will the jet travel in a complete circle aroung Earth? a. 94,247.8 mi. b. 25,156.7 mi. c. 38,000 mi. d. 8,005.7 mi.
52. ### algebra

the weight of a body above the surface of earth varies inversely with the square of the distance from the center of the earth. if maria weighs 125 pounds when she is on the surface of the earth(3960 miles from the center),determine maria weight if she is at the top of mount ...
53. ### algebra

the weight of a body above the surface of earth varies inversely with the square of the distance from the center of the earth. if maria weighs 125 pounds when she is on the surface of the earth(3960 miles from the center),determine maria weight if she is at the top of mount ...
54. ### Science help ms sue.

Multiple Choice 1. Which of the following terms refers to an object that orbits the sun and has enough gravity to be spherical but has not cleared the area of its orbit? (1 point) comet asteroid dwarf planet planet 2. Which of the following statements about the solar system’...
55. ### Science

Multiple Choice 1. Which of the following terms refers to an object that orbits the sun and has enough gravity to be spherical but has not cleared the area of its orbit? (1 point) comet asteroid dwarf planet planet 2. Which of the following statements about the solar system’...
56. ### Physics

a) A distant spaceship carrying a red headlight, emitting light with wavelength 600 nm, is heading towards the earth. Observers on the earth detect the light from the headlight as ultraviolet light with wavelength 200 nm. What is the velocity of the spaceship? b) After the ...
57. ### Physics 1

In recent years, scientists have discovered hundreds of planets orbiting other stars. Some of these planets are in orbits that are similar to that of earth, which orbits the sun (Msun = 1.99 × 10^(30) kg) at a distance of 1.50 × 10^(11) m, called 1 astronomical unit (1 au). ...
58. ### physics

Sally has a mass of 58.0 kg and Earth has a mass of 5.98 1024 kg. The radius of Earth is 6.371 106 m. What is the force of gravitational attraction between Sally and Earth? What is Sally's weight?
59. ### English

I included the last sentences on cheetahs and a few more on the use of gerund/infinitive. Thank you. 1) This project aims at establishing a second, independent population of Asiatic lions and will hopefully enable the subspecies to survive, too. 2) This centre will be located ...
60. ### Physics

You are flying to the Moon. Find the point at which the gravitational attractions of Earth and Moon on you will be equal and opposite. Given: radius of the moon: 1.74*10^6 m radius of the earth: 6.38*10^6 m orbital radius of the moon: 3.8*10^8 m Not enough information has been...
61. ### English

Here is the secomd part of my rephrase. I urgently need to rephrase point 5 (symplifying it). 1) He addresses one of the pupils, identifying her by her number in the class, not by her name. She introduces herself as Sissy Jupe. 2) He takes offence at this version of her given ...
62. ### physics

If the average speed of an orbiting space shuttle is 19600 mi/h, determine the time required for it to circle the Earth. Make sure you consider the fact that the shuttle is orbiting about 200 mi above the Earth's surface, and assume that the Earth's radius is 3963 miles
63. ### physics

Star Z has 1/5 the radius of Earth and 1000 times the Earth's mass. If a mass weighs 1.0 N on Earth, what does it weight on Star Z? Thank you.
64. ### physics

Star Z has 1/5 the radius of Earth and 1000 times the Earth's mass. If a mass weighs 1.0 N on Earth, what does it weight on Star Z?
65. ### physics

Star Z has 1/5 the radius of Earth and 1000 times the Earth's mass. If a mass weighs 1.0 N on Earth, what does it weight on Star Z?
66. ### PHYSICS

If your mass on earth is 70 kg what will be your mass on the moon considering that the gravitational field strength on the moon (g) is 1/6 of that on the earth. (g on earth = 10N/kg)
67. ### Physics

The existence of the planet Pluto was proposed based on irregularities in Neptune's orbit. Pluto was subsequently discovered near its predicted position. But it now appears that the discovery was fortuitous, since Pluto is small and the irregularities in Neptune's orbit were ...
68. ### science. -_-

Okk so im not asking for answers, i just need somone to expplain this homework to me! I don't get it what so ever. So the homework tittle is Weight in space. So it has a whole discripition in wjich i will write dpwn for you. The paper says: Gravity is an invisible force that ...
69. ### Physics

Suppose the surface (radius = r) of a cylindrical space station is rotating at 29.1 m/s to provide artificial gravity. What must be the value of r for the astronauts to weigh 1/3 of their earth weight? Don't know how to start please help.
70. ### English

1. Plants grow in earth. 2. Plants grow on earth. 3. Plants grow in the earth. 4. Plants grow on the earth. (Which ones are correct? What does #1 mean? Does #i mean that plants grows under the earth?)
71. ### Astronomy

I have another question. What would an observer on the Moon looking at the Earth see? a) always see a fully-illuminated Earth b) always see a half-illuminated Earth c0 see phases of Earth d) see continuous darkness These are the four answers, but I would think it would depend ...
72. ### Science

Can someone please please help me? I don't have a text book, i have a online book and it isn't working. Can someone please be nice and help me? Science isn't my subject! 1. Why is Earth’s temperature just right for life? (1 point) Earth’s core is hot enough to heat Earth...
73. ### drbob222,math

Am going correct with this one. It is estimated that the Earth is losing 4000 species of plants and animals every year. If S represents the number of species living last year, how many species are on Earth this year? S-4000=1 S=1+4000 S=4001 of species we have on this earth ...
74. ### PHYSICS(HELP!!)

A hole is drilled with smooth sides straight through the center of the earth to the other side of the earth. The air is removed from this tube (and the tube doesn't fill up with water, liquid rock or iron from the core). An object is dropped into one end of the tube and just ...
75. ### physics

Find the value of the magnetic field necessary to cause a proton moving at a speed of 2.50 ×10^3 m/s to go into a circular orbit of 15.5-cm radius. An electron has an energy of 100 eV as it enters a magnetic field of 3.50 × 10−2 T. Find the radius of the orbit. A ...
76. ### Physics

You are explaining why astronauts feel weightless while orbiting in the space shuttle. Your friends respond that they thought gravity was just a lot weaker up there. Convince them and yourself that it isn't so by calculating the acceleration of gravity 248 km above the Earth's...
77. ### Physics

Suppose there's a collison way out in the Oort cloud, say 30,000 AU away from the Sun. This collison causes one of the comets to alter its orbit and head almost directly at the Sun, such that the comet just skims the surface of the Sun and heads back out to its starting point...
78. ### heeeeeeeeeeeelp physics vrey tough

Estimate the time difference between the longest day and the shortest day of a year in seconds if you lived on the Earth's equator with the assumptions below. Note: this is not the difference between solstices as we are adjusting the earth's rotation axis to be in the orbital ...
79. ### English

I forgot to include the following sentences. 1) I hate people zapping (channel surfing, channel-hopping) when watching TV. 2)We bought a Freeview box an a satellite dish to watch (free) satellite channels around the world. 3) We also subscribed (?) to Sky to watch the national...
80. ### FRENCH1

é ü û à Please correct. I did my best to correct each sentence. 1.) Cette semaine nous allon à Seattle. 2.) Nous visité notre famille. 3.) Nous avons dépensé beaucoup de temps avec ils à une mariage et pendant camp. 4.) Aujourd'hui, je suis aller à Pike Place Market...
81. ### Math

am having difficulties trying to find out the missing dimensions of a cutout piece. Can someone please tell me how to figure out the dimensions. They've given me the dimensions for the whole solid, but just not the cut out piece. Your help will be appreciated :-) There is a ...
82. ### Physics

NASA wants to build a centrifuge to train its astronauts to handle the strong accelerations they will experience when the space shuttle lifts off. A composite material capable of withstanding a normal force of 120000N without rupturing is used to manufacture the base of the ...
83. ### Physics

While watching ocean waves at the dock of the bay, Otis notices that 13 waves pass beneath him in 26 seconds. He also notices that the crests of successive waves exactly coincide with the posts that are 5 meters apart. What are the period, frequency, wavelength, and speed of ...
84. ### physics

While watching ocean waves at the dock of the bay, Otis notices that 8 waves pass beneath him in 30 seconds. He also notices that the crests of successive waves exactly coincide with the posts that are 3 meters apart. What are the period, frequency, wavelength, and speed of ...
85. ### physics

While watching ocean waves at the dock of the bay, Otis notices that 13 waves pass beneath him in 32 seconds. He also notices that the crests of successive waves exactly coincide with the posts that are 7 meters apart. What are the period, frequency, wavelength, and speed of ...
86. ### physics (PLS HELP)

A hole is drilled with smooth sides straight through the center of the earth to the other side of the earth. The air is removed from this tube (and the tube doesn't fill up with water, liquid rock or iron from the core). An object is dropped into one end of the tube and just ...
87. ### physics help (elena)

A hole is drilled with smooth sides straight through the center of the earth to the other side of the earth. The air is removed from this tube (and the tube doesn't fill up with water, liquid rock or iron from the core). An object is dropped into one end of the tube and just ...
88. ### science

1) The moon is about 250,000 miles away from the Earth. To the nearest centimetre, how far would it be from the Earth in our scale model? 2) In this mode, how far away from the Earth would the Sun be?
89. ### physics

in Melbourne there used to be a huge shopping centre called "diamaru" built around an old "shot tower". hot lead globules were poured from the top of the tower which fell into a large pool of water at the foot of the tower. in this way spherical lead shot was made; hence the ...
90. ### heeeeeeeeeeeelp physics

Estimate the time difference between the longest day and the shortest day of a year in seconds if you lived on the Earth's equator with the assumptions below. Note: this is not the difference between solstices as we are adjusting the earth's rotation axis to be in the orbital ...
91. ### Physics

Because of the Earth's rotation, a plumb bob does not hang exactly along a line directed to the center of the Earth. How much does the plumb bob deviate from a radial line at 35.1° north latitude? Assume the Earth is spherical.
92. ### physics

The Earth’s radius is about 6380 km. The space shuttle is orbiting about 275.0 km above Earth’s surface. If the average speed of the space shuttle is 23500 km/h, find the time required for it to circle Earth.
93. ### Science

A Space Traveller determine the radius of a Planet to be half that of the earth after landing on its surface he find the acceleration due to gravity to be twice of the surface of the earth find the ratio of the mass of a planet to the earth
94. ### physics

How much additional energy is needed to fire a 7.2 × 10^2 kg weather monitor on the earth’s surface to a height of 120 km above the earth? (rE = 6.38 × 10^6 m, ME = 5.98 × 10^24 kg) Assume that the weather monitor rises to that height, stops, and falls back to earth.
95. ### Physics 2

what magnetic force would an electron experience due to Earth’s magnetic field if it were moving at 3x10E6 m/s directly away from earth’s surface? (Earth’s B-field in the region is parallel to the surface and has a strength of 550 µT)
96. ### Force of Gravity

How far from Earth's surface would you have to travel to be 1/4 your weight. Give your answer in Earth radii. I know you have to travel twice the distance or 1 Earth radii... I just don't know how to mathematically show it. Please help.
97. ### physics

A certain pendulum on Earth has a period of 1.6 s. What would be the period of this pendulum if it were taken to another planet that had 1.75 times the mass of the Earth and 2.5 times the Earth's radius? Express your answer in seconds to three significant digits.