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

25,650 results, page 37

1. ### Geometry

Imagine that all the people on Earth could stand side by side together. How much area would be needed? Would all the people on earth fit in Rhode Island? Explain your reasoning. Rhode Island, the smallest state in terms of area, has a land area of 1000 square miles. Assume ...
2. ### Science..physics

The moon is the Earth's nearest neighbour in space. The radius of the moon is approximately one quarter of the Earth's radius, and its mass is one eightieth of the Earth's mass. a) Culculate the weight of a man with a mass of 80kg on the surface of the moon. b) Culculate the ...
3. ### Physics

I have a hard time solving this problem. The weight of an object at the surface of a planet is proportional to the planet's mass and inversely proportional to the square of the radius of the planet. Jupiter's radius is 11 times Earth's and its mass is 320 times Earth's. An ...
4. ### physics

The acceleration due to gravity on planet X is one fifth that on the surface of the earth. If it takes 3.5 s for an object to fall a certain distance from rest on earth, how long would it take to fall the same distance on planet X? Answer in units of s.
5. ### physics

The acceleration due to gravity on planet X is one fifth that on the surface of the earth. If it takes 4.6 s for an object to fall a certain distance from rest on earth, how long would it take to fall the same distance on planet X? Answer in units of s
6. ### Maths

The earth is approximately a sphere of average diameter 12740km. The smallest of the planets is Mercury, also spherical, with average diameter 4840km. Determine what percentages (to the nearest hundredth) the volume and surface area of Mercury are of those of the Earth.
7. ### earth

The global-mean surface temperature of the earth is about 288 degrees Kelvin. Use the Stefan-Boltzman law to calculate the radiative flux corresponding to an object with this temperature. [hint: use σT4 with σ = 5.67x10-8 Wm-2K-4 ]
8. ### Physics

If a small planet were discovered whose orbital period was twice that of Earth, how many times farther from the Sun would this planet be? The answer for this one is 1.6 earth radii, but I can't seems to get solution to find the answer. I would appreciate for any hint or help.
9. ### Pre-Calc

The Greek mathematician Eratosthenes (ca. 276-195 B.C.) measured the circumference of the earth from the following observations. He noticed that on a certain day the sun shone directly down a deep well in Syene (modern Aswan). At the same time in Alexandria, 500 miles north (...
10. ### political science

An important reason for why public policy and public opinion may not coincide in the United States is that... a) the American system of government includes arrangements, such as an appointed judiciary, which may produce policy decisions that run contraty to prevailing popular ...
11. ### chemistry

Teacher gave us homework that I really don't understand. We must write chemical reactions by which we differentiate alcohols, esters, hydrogenic carbon,carboxylic acid and halogen alkanes from each other. We must not write the same reaction for two different compounds and we ...
12. ### science

Teacher gave us homework that I really don't understand. We must write chemical reactions by which we differentiate alcohols, esters, hydrogenic carbon,carboxylic acid and halogen alkanes from each other. We must not write the same reaction for two different compounds and we ...
13. ### chemistry

according to the law of conservation of mass, if the products of a reaction have a mass of 64.0g, then the total mass of the reactants a. must be less than 64.0g b. must be equal to 64.0g c. must be more than 64.0g d. is not related to the mass of the products
14. ### Physics

.) Beth launches a rocket out in the courtyard. It stays in the air for 7.25 seconds before coming back down. a.) How high did it get? b.) With what velocity did it hit the ground upon returning to Earth? c.) What is its rate of acceleration as it slows down, reaches the peak ...
15. ### Physics

Left over from the big-bang beginning of the universe, tiny black holes might still wander through the universe. If one with a mass of 3.5 1011 kg (and a radius of only 1.0 10-14 m) reached Earth, at what distance from your head would its gravitational pull on you match that ...
16. ### science

Why did the following change occur ? The snow that covered the ground all winter began to melt,temperature rose, and flowers started to bloom. a) days became shorter b) earth's tilt on its axis shifted. c) the sun's rays became more concentrated d) Earth completed one revolution
17. ### Physics

How far above the surface of the Earth does an object have to be in order for it to have a weight which is 0.53 times the same weight as it would have on the surface of the Moon? (Ignore any effects from the Earth's gravity for the object on the Moon's surface or from the Moon...
18. ### Physics

Supposed a skydiver ( mass=75kg ) is falling toward the earth. When the skydiver is 100m above the earth he is moving at 60m/s. At this point calculate the skydiver: Gravitational potential energy Kinetic energy Total mechanical energy
19. ### math

The Position of two A and B on the earth’s surface are (36°N, 49°E) and (360°N, 131°W ) respectively. (a) The difference in long between town A and town (b) Given that the radius of the earth is 6370, calculate the distance town A and town B. (c) Another town, C is 840 ...
20. ### Physics

A 54100 kg space ship has completed two thirds of its journey from the earth to the Moon. At this position, what magnitude force would the ship's engines have to supply to be the equilibrant? Assume the mass of the moon is 7.35E + 22 kg and the distance between the earth and ...
21. ### physics

The center of a 1.00km diameter spherical pocket of oil is 1.00kkm beneath the Earth's surface. Estimate by what percentage g directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is 8.0*10^2kg/m^3. Δg/g = ? %
22. ### Physics

The orbital period of the moon about the earth is approximately 27.3 days. given that the average earth-moon distance is 384,000 kilometers, predict the moon's speed using the expression for centripetal force and the gravitational force, setting them equal to each other.
23. ### Math

The Position of two A and B on the earth’s surface are (36°N, 49°E) and (36°N, 131°W ) respectively. (a) The difference in long between town A and town B (2 marks) (b)) Given that the radius of the earth is 6370, calculate the distance town A and town B. (c) Another town...
24. ### science

The moon is the earth's nearest neighbor in space the radius of the moon is approximately one quarter of the earth's radius and it's mass is one eightieth of the earth's mass.(a)calculate the weight of an object with a mass of 50.0kg on the surface of the moon.(b)calculate the...
25. ### Physics

A body of mass 20kg is transferred from earth (grams=weight newton kg) to another planet where G=2 Newton kg, 1.Wat is the mass on earth? 2.wat is the wieght on earth? 3.wat is the mass on the other planet? 4.wat is the weight on the other planet?
26. ### math

A body of mass 20kg is transferred from earth (grams=weight newton kg) to another planet where G=2 Newton kg, 1.Wat is the mass on earth? 2.wat is the wieght on earth? 3.wat is the mass on the other planet? 4.wat is the weight on the other planet?
27. ### Physics

A body of mass 20kg is transferred from earth (grams=weight newton kg) to another planet where G=2 Newton kg, 1.Wat is the mass on earth? 2.wat is the wieght on earth? 3.wat is the mass on the other planet? 4.wat is the weight on the other planet?
28. ### Physics

A hypothetical spherical planet consists entirely of iron (p=7860kg/m^3). Calculate the period of a satellite that orbits just above its surface. I really can't solve this! No other information was provided. Please and thank you
29. ### physics help!!!

A hypothetical spherical planet consists entirely of iron (p=7860kg/m^3). Calculate the period of a satellite that orbits just above its surface. I really can't solve this! No other information was provided. Please and thank you
30. ### physics help!!

A hypothetical spherical planet consists entirely of iron (p=7860kg/m^3). Calculate the period of a satellite that orbits just above its surface. I really can't solve this! No other information was provided. Please and thank you
31. ### main ideas

Scientists generally agree that Earth is getting warmer due to what's called the greenhouse effect. A greenhouse used for plants stays warm because sunlight and heat coming through the glass roof are mostly trapped. The heat doesn't radiate back into the atmosphere because it'...
32. ### earth

how would eath's gravity effect you in space??? At what altitude does the Earth's gravity no longer have an effect on the astronauts or the space shuttle???
33. ### science

The gravitational pull on Jupiter is 2.5 times greater than Earth's gravitational pull. If an object weighs 10 pounds on Earth, what will it weigh on Jupiter?
34. ### Physics

Mars has a radius of about 0.53 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.
35. ### physics

Mars has a radius of about 0.38 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.
36. ### physics

Mars has a radius of about 0.38 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.'
37. ### physics

A 4.92E+2 kg hot-air balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing +9.81E+4 J of work on the balloon in the process. At what height above the surface of the earth does the balloon have a speed of 7....
38. ### Precalculus

A nautical mile equals the length of arc subtended by a central angle of 1 minute on a great circle on the surface of Earth. If the radius of Earth is taken as 3960 miles, express 1 nautical mile in terms of ordinary, or statute, miles.
39. ### physics

If you weigh 650 N on the earth, what would be your weight on the surface of a neutron star that has the same mass as our sun and a diameter of 15.0 km ? Take the mass of the sun to be ms = 1.99×10^30 kg, the gravitational constant to be G = 6.67×10^−11 Nxm^2/kg^2 , ...
40. ### college physics

Although astronauts appear weightless, they are not. They only appear weightless because they are in free fall. If a 79 kg astronaut is orbiting Earth with an orbital radius of 5.31×107 m, determine how much the astronaut would weigh. Earth's mass is 5.974 1024 kg.
41. ### Physics

A skydiver is jumping from an airplane traveling at 10.0 m/s. The plane is 3520 m above the earth. The sky diver pulls his cord at 1760 m above the earth. Neglecting air resistance, how far does the skydiver travel horizontally before pulling the cord?
42. ### Science

The rock cycle suggests that A)rocks are always added to Earth's mass. B)rocks are continuously being recycled into different forms. C)rocks disappear from Earth as they go underground. D)rocks always stay in the same form. My answer is A... is that right??
43. ### earth science

briefly explain how earths atmosphere heated? Energy is transferred between the earth's surface and the atmosphere via conduction, convection, and radiation. Conduction is the process by which heat energy is transmitted through contact with neighboring molecules
44. ### physics

Determine the force per meter on a lightning bolt at the equator that carries 20 000 A and is perpendicular to the Earth’s magnetic field, 3x10-5 T. What is the direction of the force if the current is straight up and the Earth’s field direction is due north which is ...
45. ### physics

Determine the force per meter on a lightning bolt at the equator that carries 20 000 A and is perpendicular to the Earth’s magnetic field, 3x10-5 T. What is the direction of the force if the current is straight up and the Earth’s field direction is due north which is ...
46. ### physics

Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same longitude. Do not neglect ...
47. ### phys

The space shuttle, with an initial mass M = 2.41E+6 kg, is launched from the surface of the earth with an initial net acceleration a = 26.1 m/s2. The rate of fuel consumption is R = 6.90E+3 kg/s. The shuttle reaches outer space with a velocity of vo = 4632 m/s, and a mass of ...
48. ### Physics

The sun is more massive than the moon, but the sun is farther from the earth. Which one exerts a greater gravitational force on a person standing on the earth? Give your answer by determining the ratio Fsun/Fmoon of the magnitudes of the gravitational forces. Use the data on ...
49. ### physics 1

The sun is more massive than the moon, but the sun is farther from the earth. Which one exerts a greater gravitational force on a person standing on the earth? Give your answer by determining the ratio Fsun/Fmoon of the magnitudes of the gravitational forces. Use the data on ...
50. ### physic 1

The sun is more massive than the moon, but the sun is farther from the earth. Which one exerts a greater gravitational force on a person standing on the earth? Give your answer by determining the ratio Fsun/Fmoon of the magnitudes of the gravitational forces. Use the data on ...
51. ### science- geology

I have to draw a topographical map on poster board of an imaginary island. It must have 2 mountains, 12 MI apart, one with a benchmark of 1510 ft and the other of 1075 ft. We must include 2 streams, one that flows down the larger lake into the ocean, the other must flow in and...
52. ### algebra with finance

A video game has been developed whereby the player must earn a certain number of experience points before progressing to the next level. On level 1, a player must earn 1 experience point. On level 2, a player must earn 4 experience points. On level 3, a player must earn 8 ...
53. ### physics

In the early morning hours of June 14, 2002, the Earth had a remarkably close encounter with an asteroid the size of a small city. The previously unknown asteroid, now designated 2002 MN, remained undetected until three days after it had passed the Earth. Suppose that at its ...
54. ### physics

In the early morning hours of June 14, 2002, the Earth had a remarkably close encounter with an asteroid the size of a small city. The previously unknown asteroid, now designated 2002 MN, remained undetected until three days after it had passed the Earth. Suppose that at its ...
55. ### physics

In the early morning hours of June 14, 2002, the Earth had a remarkably close encounter with an asteroid the size of a small city. The previously unknown asteroid, now designated 2002 MN, remained undetected until three days after it had passed the Earth. Suppose that at its ...
56. ### HELP

answers marked below 1. Which of Earth’s spheres contains most of its mass? (1 point) atmosphere hydrosphere geosphere biosphere 2. Erosion and weathering are examples of which types of forces? (1 point) constructive forces destructive forces gravitational forces inertia-...
57. ### science

how is the air we breath today different from 3.6 billion years ago? http://en.wikipedia.org/wiki/Earth's_atmosphere#Evolution_of_the_Earth.27s_atmosphere http://eesc.columbia.edu/courses/ees/climate/lectures/earth.html
58. ### physics

A proton with charge mass ratio of 108 C/kg is moving in a circular orbit in a uniform magnetic field of 0.5T .Calculate the frequency of revolution.
59. ### Math(Dynamics)

To find the time taken by a planet to describe a given arc of its elliptic orbit starting from the nearer and of the major axis.
60. ### History

With which statement would BOTH FDR and Reagan agree? A. Government must protect freedom of speech. B. Government must resolve inequality of wealth. C. Government must hold businesses accountable. D. It is government’s role to resolve social problems.
61. ### Math

Monica stepped outside and began to think how fast she is moving even when she is standing still. Assume that the earth is a sphere with a radius of 3960 miles and Monica is at a latitude of 13∘N. What is Monica's speed due solely to the rotation of the earth in miles ...
62. ### Mathematics

Monica stepped outside and began to think how fast she is moving even when she is standing still. Assume that the earth is a sphere with a radius of 3960 miles and Monica is at a latitude of 13∘N. What is Monica's speed due solely to the rotation of the earth in miles ...
63. ### Math

Monica stepped outside and began to think how fast she is moving even when she is standing still. Assume that the earth is a sphere with a radius of 3960 miles and Monica is at a latitude of 13∘N. What is Monica's speed due solely to the rotation of the earth in miles ...
64. ### MATH HELP

Monica stepped outside and began to think how fast she is moving even when she is standing still. Assume that the earth is a sphere with a radius of 3960 miles and Monica is at a latitude of 13∘N. What is Monica's speed due solely to the rotation of the earth in miles ...
65. ### P.E.

Which of the following is not true about a soccer throw-in? A. Both hands must be on the ball. B. The ball must come completely behind the head. C. Both feet must stay in contact with the ground. D. The ball can be thrown in-bounds with sidespin Not sure which one it is can ...
66. ### science

If Earth is 149.6 million Kilometers from the sun, or 93 million miles away. suppose there was an imaginary road from earth to the sun. If you were in a car traveling 100 km an hour, it would take you 1,490,000 hours or just 170 years to reach the sun. If it took 170 years to ...
67. ### Physics

The acceleration due to gravity on the moon is about one sixth its value on earth. If a baseball reaches a height of 62 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer in units of m
68. ### Physics

If a projectile is launched from Earth with a speed equal to the escape speed, how high above the Earth's surface is it when its speed is three-fifths the escape speed? I keep getting the answer 2.56x10^6 m after solving it a few different ways. Help would be great.
69. ### PHYSICS

Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 478 nm, determine the number of photons per second per square meter that reach the earth.
70. ### physics

Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 478 nm, determine the number of photons per second per square meter that reach the earth.
71. ### physics

The acceleration due to gravity on the moon is about one-sixth its value on earth. If a baseball reaches a height of 78 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer in units of m
72. ### physics

Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 521 nm, determine the number of photons per second per square meter that reach the earth.

In the early morning hours of June 14, 2002, the Earth had a remarkably close encounter with an asteroid the size of a small city. The previously unknown asteroid, now designated 2002 MN, remained undetected until three days after it had passed the Earth. Suppose that at its ...
74. ### Electric Fields

In a particular region of Earth's atmosphere, the electric field above Earth's surface has been measured to be 151 N/C downward at an altitude of 280 m and 167 N/C downward at an altitude of 430 m. Calculate the volume charge density of the atmosphere, assuming it to be ...
75. ### Physics

A deorbit burn has been performed. During this deorbit burn a pre-calculated Delta V (change in velocity) of 290 ft/s (or 88.4 m/s) will be used to decrease the Shuttle’s altitude from 205 miles to 60 miles at perigee. The Shuttle’s Orbital Maneuvering System (OMS) engines...
76. ### electricity

What bias conditions must be present for the normal operation of a transistor amplifier? A)the emitter base junction must be reverse biased, and the collector base junction must be forward biased. B)the emitter base junction must be forward biased, and the collector base ...
77. ### Physics

What is the speed of the rocket when it is 350 above the surface of the earth? A rocket starts from rest and moves upward from the surface of the earth. For the first 10 of its motion, the vertical acceleration of the rocket is given by a(y)=2.9, where the -direction y+ is ...
78. ### physics

A dime is 1.8 cm in diameter. Earth's moon is 3.844´1010 cm from Earth and has a diameter of 3.76´108 cm. At what distance from your eye would you have to hold a dime so that it has the same angular diameter as the full moon?
79. ### earth

how long does it take for light from Jupiter to come to earth. for example tonight the planet Jupiter can be seen by the moon, 2/25/12 and we see the light from the planet and how old is that light. thanks. jerry in colorado USA
80. ### physics

Mars Rover When the Mars rover was deployed on the surface of Mars in July 1997, radio signals took about 12 min to travel from Earth to the rover.How far was Mars from Earth at that time?

The weight M of an object on Mars varies directly as its weighton earth. A person who weighs 95 lb on earth weighs 38 lbs on Mars. How much would a 100 lb person weigh on Mars?
82. ### physics

A rocket cruising past earth at 0.800c shoots a bullet out the back door,opposite the rocket's motion,at 0.900c relative to the rocket. What is the bullet's speed relative to the earth?
83. ### History

How is the president's power to make appointments limited? A:He can only appoint law-makers B:He must make all appointments in the first 100 days of office C:The appointments must undergo judicial review D: The Senate must approve the appointments*** Is this correct?
84. ### Earth Science

In recent years, scientists have been concerned about decrease in the ozone content of earth’s upper atmosphere. What is the principle threat to humans if this decrease in ozone continues? My answer is, Decreasing precipitation leading to crop failure and possible human ...
85. ### English

Read the sentence from "Zoos: Joys or Jails?" Which best describes the author? "Though zoos are meant to be a joy to viewers and teach lessons about our earth, the zoo jails its inhabitants and passes on faulty knowledge. The wild animals in our world are a wonder, and they ...
86. ### physic's problem

GPE = MASS X GRAVITY X HEIGHT GRAVITY IS ALWAYS 10 M/S 2 (SQUARED) KE = 1/2 X MASS X SPEED 2 (SQUARED) I am uncertain what your question is. As a matter of interest, the value of 10m/s^2 for the acceleration of gravity is in error, in fact, it is never that value, but is less...
87. ### physics

The Sun and Earth each exert a gravitational force on the Moon. What is the ratio FSun/FEarth of these two forces? (The average Sun-Moon distance is equal to the Sun-Earth distance.)

Hi, this is my assignment. I did make it 30 words long but, I think it's terrible. It's very hard for me to do. Could someone please give me some suggestions as to what to change or improve please? You must draft a lead sentence for your news story about your chosen career in ...
89. ### chem

1. The total power used by humans worldwide is approximately 15 TW (terawatts). Sunlight striking the Earth provides 1.336 kW per square meter (assuming no clouds). The surface area of Earth is approximately 197,000,000 square miles. How much of Earth’s surface would we need...
90. ### science

could someone pleassssse help me answer these questions? do we always see the same side of the moon and how do you know for sure? if the moon rotated just asa quickly as earth , would we see the same sides of the moon from earth?explian.
91. ### Free Fall

The acceleration due to gravity on planet X is one fifth that on the surface of the earth. If it takes 3.9 s for an object to fall a certain distance from rest on earth, how long would it take to fall the same distance on planet X?
92. ### Math (Trig/pre-calculus)

some stars are so far away that their position appear fixed as earth orbits the sun. other stars, however, appear over time to shift their positions relative to the background of "fixed" stars. suppose that the star shown below appears to shift through an arc of theta = 0 ...
93. ### chem

Global warming refers to the rise in average global temperature due to the increased concentration of certain gases, called greenhouse gases, in our atmosphere. Earth¡¯s oceans, because of their high heat capacity, can absorb heat and therefore act to slow down global ...
94. ### Law

1. What requirement is imposed under Megan’s Law? A. Sex offenders must inform local law enforcement of their location and nature of their prior conviction. B. Each jurisdiction must create a local, multi-tiered sex offender registry. C. The felony records of all minors must...
95. ### geology

When astronauts brought back rock samples from the Moon, the minerals present were mostly the same as those found on Earth. Can you think of reasons why this might be so? Would you expect minerals on Mars or Venus to be the same, or at least very similar, to those on Earth?
96. ### physics

Suppose the straight-line distance between New York and San Francisco is 4.4 106 m (neglecting the curvature of the earth). A UFO is flying between these two cities at a speed of 0.69c relative to the earth. What do the voyagers aboard the UFO measure for this distance?
97. ### Physics

The acceleration due to gravity on the moon is about one-sixth its value on earth. If a baseball reaches a height of 64 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer in units of m Can you...
98. ### Physics

A 5.00 x 102 kg hot air balloon takes off from rest at the surface of the earth. The buoyant force lifts the balloon straight up, performing 9.70 x 104 J of work on the balloon. At the instant the balloon's upward speed is 4.08 m/s, the balloon will be ____ m above the surface...
99. ### Physics

why does an astronaut weigh less on the moon than on Earth? is it because the gravitational field strength is less on the moon's surface than on Earth's surface
100. ### Physics 11

How much would a 80kg astronaut weigh on Earth? How much would they weigh 500 km above the surface of the Earth? Thank you!