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

9,298 results, page 30
1. ## physics

The earth spins on its axis once a day and orbits the sun once a year (365 1/4 days). Determine the average angular velocity (in rad/s) of the earth as it (a) spins on its axis and (b) orbits the sun. In each case, take the positive direction for the
2. ## Physics

The earth spins on its axis once a day and orbits the sun once a year (365 1/2 days). Determine the average angular velocity (in rad/s) of the earth as it (a)spins on its axis and (b) orbits the sun. In each case, take the positive direction for the
3. ## science

Find the angular and linear velocities of a man due to the rotation of the earth if he standing A) at the equator B) in Muscat(latitude23.5) C) in oslo(latitude60) Take tha radius of the earth as 6380km
4. ## physics

A rocket is fired straight up through the atmosphere from the South Pole, burning out at an altitude of 208 km when traveling at 5.8 km/s. (a) What maximum distance from Earth's surface does it travel before falling back to Earth?
5. ## Physics

Earth is a spherical body, of radius 6,376 km, which completes a full rotation about its axis in 24.0 h. how long (in hours) should the day on Earth be so that a person at the equator is able to float freely above the ground?
6. ## Earth Science

Computer models of Earth's climate project increases in the average temperature from 2°C to 6°C by the end of the century. Have these high temperatures ever occurred before in the past 400 000 years?
7. ## English

I just need to know if zapping, channel surfing are synonyms, if subscribe is followed by to, and if propose could be followed the indirect object. I included a few more sentences I really don't know if they are possible. 1) I hate people zapping (channel
8. ## Science

(just a quick science question, pls correct my answer if im wrong..) Which of the following statements is true A.) there is more water on earth now than there was millions of years ago **** B.) there is less water on earth now than there was millions of
9. ## Science

What are 2 processess that change earth slowly? The ___1____, which includes the__2____ and part of the _____3_____, is divided into plates that carry all of the Earth's lands and oceans. These plates float on a ___4____ layer of rock in the upper mantle
10. ## physics

Find the ratio of the gravitational force on the Moon due to the Earth to the gravitational force on the Moon due to the Sun. (The mass of the Earth is 5.97 1024 kg, the mass of the Moon is 7.36 1022 kg, the mass of the Sun is 1.99 1030 kg, and the average
11. ## physics

Find the ratio of the gravitational force on the Moon due to the Earth to the gravitational force on the Moon due to the Sun. (The mass of the Earth is 5.97 1024 kg, the mass of the Moon is 7.36 1022 kg, the mass of the Sun is 1.99 1030 kg, and the average
12. ## Physics

In the rough approximation that the density of the Earth is uniform throughout its interior, the gravitational field strength (force per unit mass) inside the Earth at a distance r from the center is gr/R, where R is the radius of the Earth. (In actual
13. ## Physics

Some people believe that the Moon controls their activities. The Moon moves from being directly on the opposite side of Earth from you to be being directly overhead. Assume that the Earth-Moon (center-to-center) distance is 3.82 multiplied by 108 m and
14. ## Ms.Sue August or Anonymous

All 3 of you I see usually answer a lot of questions. Can you help me with some of these? 1. Erosion is a slow process that causes change to Earth's surface. All of the following are sources of erosion except A.wind B.earthquakes C.glaciers D.ocean waves
15. ## Science

How does gravity help keep satellites in orbit?
16. ## physics

State law of orbit?
17. ## chem.

How much heat would be required to warm Earth's oceans by 1.0 degree celsius ? Assume that the volume of Earth's oceans is 137x10^7 km^3 and that the density of seawater is 1.03 g/cm^3. Also assume that the heat capacity of seawater is the same as that of
18. ## Physics

The Earth is about 81 times more massive than the moon. During the gravitational interation of the Earth and the Moon, the magnitude of the gravitational force acting on the Earth _______ the gravitational force acting on the Moon. A) is greater than B) is
19. ## Physics

According to Anna, on Earth, Bob is on a spaceship moving at 0.8c towards Earth, and Carl, a little farther out, is on a spaceship moving a 0.9c towards Earth. According to Bob, how fast is Carl moving relative to Earth? (a) According to Bob, how fast and
20. ## Orbital period

A planet orbiting a certain star is observed to have an orbital period of 65 days with an orbit whose semi-major axis is 3.8 × 107 km. A second planet orbiting the same star has an orbital period of 450 d. What is the semi-major axis of its orbit?
21. ## homework

Which of the following would cause the greatest decrease in gravitational force between the earth and the moon? an increase in the earth's mass an increase in the moon's mass an increase in the distance between the earth and the moon a decrease in the
22. ## science

Which of the following would cause the greatest decrease in gravitational force between the earth and the moon? an increase in the earth's mass an increase in the moon's mass an increase in the distance between the earth and the moon a decrease in the
23. ## Physics

the weight of the body on the surface of earth is 392N what will be the weight of this body in another body whose mass is double of earth mass and radius is fourth multiple of earth radius?

Which of the following best describes what causes the phases of the moon? A. The alignment of the sun, Earth and moon (I think it's this one) B. The speed of the moon around the Earth C. The speed of the Earth around the sun D. The alignment of the planets
25. ## Earth's Dynamic Atmosphere

Because scientists were so puzzled by the phenomenon of energy through the vacuum of space, what did they call the material they assumed existed between the Earth and the Sun? A. Ether B. Sciosphere C. Plasma D. Albedo my answer is a.
26. ## Earth Science

Which of the following statements correctly describes the asthenosphere? 1- it is thin cold and rigid layer 2- it is the source of the earth's heat 3- it permits plate motion 4- it occurs only near subduction zones My answer is 1
27. ## science

Scientists believe that Earth's early atmosphere changed in composition as a result of a. the appearance of oxygen-producing organisms b. the drifting of the continents c. the changes in Earth's magnetic field d. a transfer of gases from the Sun
28. ## social studies

Despite temperatures of more than 5,000º F, Earth's inner core is solid because of _____________________. a layer of ice just above it. the fact that Earth rotates so quickly. a thickness of over 1,000 miles. great pressure from the layers around it.
29. ## Physics

I have no idea how to do this problem At what distance from the Earth will a spacecraft on the way to the Moon esperience zero net force due to these two bodies because the EArth and Mon pull with equal and opposite forces? there\'s no data in the question
30. ## math

John has traveled from a distant planet to spend one earth year visiting with us. However, one year on earth is not the same as one year on john's planet. on john's planet: 10 seconds = 1 minute 10 minutes = 1 hour 10 hours = 1 day 10 days = 1 week 10
31. ## modern physics

The earth and the sun are 8.3 light-minutes apart in the same inertial frame. Two events occur at t = 0 on the earth and t = 3 minutes on the sun respectively. Calculate the time difference between the events according to an observer moving at u = 0.6c
32. ## modern physics

The earth and the sun are 8.3 light-minutes apart in the same inertial frame. Two events occur at t = 0 on the earth and t = 3 minutes on the sun respectively. Calculate the time difference between the events according to an observer moving at u = 0.6c
33. ## chemistry

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
34. ## Space Exploration

List three subsystems of a SARSAT satellite and tell what the function of eCh subsystem is. Please help I can't seem to find them.
35. ## Physics

Find the orbital velocity of a satellite orbiting 1800km above sea level in meters per second?
36. ## College Algebra

A person who is 6 feet tall walks away from flagpole toward the tip of the shadow of the flagpole. When the person is 30 feet from the flagpole, the tips of the person's shadow and the shadow cast by the flagpole coincide at a point 5 feet in front of the
37. ## Science

How much time is required for reflected sunlight to travel from the Moon to Earth if the distance between Earth and the Moon is 3.85 x 10 to the 5th exponent?
38. ## physics

What is the ratio of the gravitational force on you when you are 5800 km above the Earth's surface versus when you are standing on the surface? (The Earth's radius is about 6400 km.)
39. ## physics

Compute your mass in kilograms (1 pound has a mass of 0.45 kg on Earth) and then your weight in Newton’s for the earth, moon, and several planets. Where are you heaviest?
40. ## physical science

when an astronaut orbits the earth, and is falling in a circle around the Earth, is he/it creating a CENTRIFUGAL force or a CENTRIPETAL force?
41. ## Science

Approximately what percentage of the estimated age of Earth does the Cenozoic Era represent and how do you know? look at pg. 9 in Earth Science Reference Tables? a. 1.4% b. 5.0% c. 11.9% d. 65.0%
42. ## Science

If on earth you weigh 420 newtons, and the gravitational pull on the moon is 1/6 of what it is on earth. What would be your weight on the moon?? Please show work Thanks!! :)
43. ## Science

*NEED HELP ASAP* TIA Hi everyone! If you could help me I would really like that! Question: Suppose the moon rotated on its axis just as quickly as Earth. Would you still always see the same side of the moon from Earth?
44. ## math

Describe all the points on the Earth’s surface that are exactly 4000 miles from the North Pole. If you need to, use 3960 miles for the radius of the Earth.
45. ## Earth Science

What are two forces that cause the Earth's surface to constantly change and what are their effects on the planet? Please help I do homeschooling and I'm super behind in science please answer before 12:00 p.m. on 11-17-09
46. ## Physics

Weight of an object on the surface is 100N . What will we it's weight a planet whose mass 10times that of earth and radius is 3 times as that of earth??
47. ## physics

9. The surface of the earth is approximately 6,400 km from its center. If the mass of the earth is 6.0 x 1024 kg, what is the acceleration due to gravity near the surface?
48. ## Physics

Calculate the time it takes for a gamma ray to travel from the Sun to the Earth Distance (mean) Earth to Sun=1.5 e11 m
49. ## math

Describe all the points on the Earth’s surface that are exactly 4000 miles from the North Pole. If you need to, use 3960 miles for the radius of the Earth.
50. ## earth science

one reason the moon might be a better place than earth to study the universe is there is almost no atmosphere. True or False MY guess is false
51. ## Physics

A raindrop has a mass of 5.9 10-7 kg and is falling near the surface of the earth. Calculate the magnitude of the gravitational force exerted in the following. (a) on the raindrop by the earth
52. ## physis

A man weighs 750 N on the surface of the earth. What would be his weight when standing on the moon? The masses of the earth and the moon are respectively, 5 98 0 kg and 7 36 0 kg. Their radii are respectively 6 37 0 km and 1 74 0 km
53. ## Easy physics...having trouble with part b

Moon effect. Some people believe that the Moon controls their activities. If the Moon moves from being directly on the opposite side of Earth from you to being directly overhead, by what percentage does (a) the Moon's gravitational pull on you increase and
54. ## space

gowing 10,00 miles per hour how long will it take to get to jupiter from earth with earth the sun and jupiter alined like a straight line or just an estimation
55. ## Physics

calculate the escape velocity on the surface of earth, acceleration due to gravity will be 36 percent of its value on the surface of earth .if mean radius is 6400 km?
56. ## MATH

The moon's distance from the earth is 360000 km and its diameter subtends an angle of 31 minute at the of the observer on the earth . Find the radius of the moon.
57. ## PHYSICS

The planet Trantor has triple the mass of Earth, but only twice Earth’s radius. Compute the acceleration due to gravity at the surface of Trantor
58. ## Earth Science

On the surface of the earth, it is approximately 6,200 miles from the equator to the north or south pole. How many miles is it between 2 parallels 1 degree apart?
59. ## science

A man has a mass of 80.0kg is standing on the surface of the earth.(a)calculate the magnitude of the attractive force that the earth exerts on the man
60. ## Physics [No Math]

When calculating weights away from Earth's surface, for example: At 6.38x10^3 km away from Earth's surface a spacecrafts weight is d=rE+rE Then F=(1/4)(SpaceCraftWeight) Why is the distance 2rE?
61. ## phyics-universal gravity

Calculate the force of gravity on a spacecraft 6400 km (1 earth radii) above the Earth's surface if its mass is 1600 kg.
62. ## Science

How many minutes are required for a radio signal to travel for Earth to a space station in Mars if the planet Mars is 7.83 x 10 to the 7th km from Earth?
63. ## physics

A 70 kg man weighs 686 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 14% of his body weight? i don't even know where to start with this question... i need help!
64. ## physics

Calculate the force of gravity on a 1-kg mass at Earth's surface. Mass of Earth is 6.0 x 10^24th powerkg and Radius is 6.4 x 10^6th power m
65. ## Chemistry

If the distance from the Earth to the moon is 3.84 x 105 km. How long would it take a radio wave with wavelength 413.8 m to travel from Earth to the moon? C=(lanbda)v & E=(h)v
66. ## trg

An earth embankment is 27 m long and has a cross-section shown in the diagram. Find the volume of earth needed to build the embankment.
67. ## Math

The ratio of an object weights on Earth to its wieght on Neptune is 5:7. HOw much would a person who wieghs 150 pounds in Earth weigh on Neptune?
68. ## Physics

The rate of motion of the earth at its equator is about 1,038 mi/h because of its rotation. From this information, estimate the earth's circumference using an order-of-magnitude estimate.
69. ## space

What is the value of g for space-shuttle territory , about 200km above the Earth's surface. Data: Earth's mass is 6x10^24kg, and radius is 6380 km
70. ## physics

I need help finding an equation for: an asteroid revolves around the sun with a mean orbital radius twice that of Earth's. Predict the period of the asteroid in Earth years. Thank you.

If Earth were located where Mars is in space, the temperature of Earth would A) be significantly higher. B) be significantly lower. C) be about the same. D) fluctuate greatly. B maybe?
72. ## physics

a 70 kg block rests on the earth's surface. How much energy is required to move the block very far from the earth, ending up at rest again?
73. ## physics

Imagine a planet that orbited the sun at a distance three times that of Earth. What would the period of that planet be in Earth years?

What makes the moon rise? a)Alignment of the stars 2) Earth's rotation 3) Moon orbits about the Earth Is the answer (2)?
75. ## physics

prove that the moon complete its one revolution around the earth in (27.3) days.distance of moon from the surface of the earth is (380000km).
76. ## Earth Science

Which Scientific hypothesis for the Origin of Life on Earth is most widely accepted.? What evidence is there for the hypothesis? Need help. I'm just not how to go with the question.
77. ## physis

Search: 2. Explain how radioactive decay has always warmed the Earth from the inside, and nuclear fusion has always warmed Earth from the outside.
78. ## Physics

A man has a mass of 80kg on the Earth's surface. Part A How far above the surface of the Earth would he have to go to "lose" 13% of his body weight?
79. ## physics

Two electrons are placed; one at north pole and other at south pole of earth. Find the force between them. Given diameter of earth= 12800 km.
80. ## PHYSICS

An object weighs 480 N on earth. what would its weight be on a planet whose mass is twice the mass and half the ratio of the earth?
81. ## physics

An object is projected from the surface of the earth with a speed of 2.73x10^4 m/s. What is its speed when it is very far from the earth? (Neglect air resistance).
82. ## science

how do the fluxes of radiation help explain why air temperature near the earth's surface is higher than it is 2km above the earth's surface
83. ## Math

The speed of light is 3x10^8 m/s. If the sun is 1.5 x10^11 meters from the earth, how many seconds does it take light to reach the earth?
84. ## Physics

The force of gravity on the moon is said to be 1/6th of that on the earth .what would be the mass of 12kg weighed on the surface of the earth and moon
85. ## Science physics

what will be the acceleration due to gravity at up planet whose mass is 8 times the mass of the earth and whose radius is twice that of the earth? g=10
86. ## Science , Earth , Waterce , Earth , Waterce

How can I answer this question? Draw an overall conclusion: how does water compare to other substances? Why do you think so? Please help me...
87. ## physics

somewhere between earth and the moon gravity from these two bodies on a space pod would cancel. Is this location nearer to earth or the moon?
88. ## physics

Calculate the force of gravity on a 16 kg mass at Earth's surface. The mass of Earth is 6. 1024 kg, and its radius is 6.4 106 m.
89. ## physics

with what velocity must a body be thrown from earth surface so that it may reach a height 4Re the earth surface. given Re=6400km g=9.8m/s

91. ## Chemistry

the distance from the sun to earth is 1.496 x10 ^8 km. how long does it take light to travel from the sun to earth How do you solve this?
92. ## College Algebra

A person who is 6 feet tall walks away from a flagpole toward the tip of the shadow of the flagpole. When the person is 32 feet from the flagpole, the tips of the person's shadow and the shadow cast by the flagpole coincide at a point 4 feet in front of
93. ## Physics (pressure)

What is the total mass of the earth's atmosphere? The radius of the Earth is 6.37E6 m, and atmospheric pressure at the surface is 1.013E5 N/m^2 (or Pa). I tried this: 1.013E5 Pa = Mg/ pi(6.37E6)^2 1.013E5 Pa (denominator)= 9.8 M solve for M: I'm coming
94. ## English

1. Read the following paragraph from "Five Hours to Simla." After the cacophony of screeching brakes and grinding gears, there followed the comparatively static hum of engines, and drivers waited in exasperation for the next lurch forwards. For the moment
95. ## Precalculus

Can someone check my answers please? Thank you :) 30. What is Earth's rotational speed at (a) Bangor, Maine (latitude 45 degrees N) and (b) Rio de Janeiro, Brazil (latitude 23 degrees S)? (It's given in the problem also that Earth's rotational speed at the
96. ## Math

an object’s weight on a planet is directly proportional to the mass of that planet and inversely proportional to the square of the radius of the planet. jupiter is 318 times as massive as Earth and has a radius 11 times as large as that of Earth. if
97. ## physics

Calculate the force needed to accelerate a 1 kg ball by 3 m/s: a. in space along way from the earth. b. on the ground in a direction horizontal to the ground. c. on the earth vertically upward.
98. ## science

the alkaline-earth metals react similarly because they all have the same number of electrons in their outer energy level. Which group contains the alkaline-earth meatals?
99. ## earth

A helicopter is ascending vertically with a speed of 4.00 m/s. At a height of 185 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground?
100. ## science

The Paleozoic Era is noted for which two changes? a) rocks were formed b) the earth heated up c) people appeared on earth d) mountains were formed Just need to know if my answer or right or wrong. Thanks! :) d