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

9,298 results, page 69
1. ## Science

scientists often use models to Study the movement of earth and it's moon. Why do they use models to study the movements?
2. ## physics

How would your Mars weight compare to your earth weight if the acceleration due to gravity on Mars is 3.71 m/s2?
3. ## maths

the longest and shortest distance of eareth from sun are r1 and r2. what is the distance of the earth from the sun when it is perpendicular to it
4. ## Math

The mass of Saturn is about 100 times the mass of Earth which is 5.97 x10^23 kg. How heavy is Saturn?
5. ## math

the steps to a math quiz. the earth rotates once every 23 hours 36 minutes 4 seconds.how many seconds is that?
6. ## physics- multiple choice

1. A transport truck pulls on a trailer with a force of 600N [E]. The trailer pulls on the transport truck with a force a) of zero b) of less than 600 N is the truck is slowing down c) equal to 600 N only if the truck is moving at constant velocity d)
7. ## earth science

24. emormous masses of ____ rock all over the world, such as the Columbia Plateau in the northwestern U.S., give evidence of some huge catastrophic action. granite mountainous sedimentary volcanic volcanic right? Yup.... absolutely
8. ## Physics

Find the magnitude of the gravitational force a 65.4 kg person would experience while standing on the surface of Earth with a mass of 5.98 × 1024 kg and a radius of 6.37 × 106 m. The universal gravitational constant is 6.673 × 10−11 N · m2/kg2.
9. ## science

The Big Bang Hypothesis suggests that 20 billion years ago a) life first formed on the planet earth b) all matter collapsed into a single ball c) our sun was born d) space was much the same as it is today e) matter did not exist a
10. ## Physics

Calculate the energy needed to accelerate a spaceship of mass 10,000 kg to a speed of 0.3c for intergalactic space exploration. Compare with the projected energy usage of the Earth in a decade~10^22J? well i don't know how to start the problem
11. ## science

whats the term? 1)the turning of air masses from their original paths because of earth's rotation 2)high altitude winds that occur in places where trade winds and polar easterlies meet prevailing westerlies
12. ## Graphic Design

5. Which of the following statements regarding the Gestalt movement is true? A. Context has a great impact on reality. B. Expressive colors replaced traditional earth tones. C. Abstract art was born. D. Reality is given more precedence than perception. 6.
13. ## physics

captain iplanet measures the magnetic forces on a proton which is vertically falling at 1996 m/s at the equator (take the earth's field to be .4 Gauss horizontal and pointing northward). what force would she measure? Give both force and direction.
14. ## just a ?

Do you think that it is even possible that we could live in a sustainable way at this point? In other words,even if our population growth decreased and each member of society was willing to contribute to sustainable living and protecting the environment,
15. ## Physics Help, Please

In the final stages of the landing process, a spaceship decelerates at a constant rate of 5.3 m/s2 heading towards the Earth. A 3kg lamp is hanging straight down, attached to the ceiling of the ship cabin by a chain. What is the tension in the chain?
16. ## College Algebra

The population of the Earth is approximately 6 billion people and is growing at an annual rate of 1.9%. Assuming a Malthusian growth model, find the world population in 45 years. (Round your answer to one decimal place.)
17. ## math

An iceberg breaks off from the Antarctic continent and floats due north at constant velocity/ It's latitude south decreases by 1 degree in 8 days. Taking the circumference of the earth to be 40 000km, calculate the speed of iceberg in ms^-1.
18. ## trigonometry

Assume that the cities lie on the same north-south line and that the radius of the earth is 6400 km. Can you help me find the latitude of Spokane, WA if Spokane and Jordan Valley, OR, 43.15degreesN, are 486 miles apart. I think its either A. 47.50degN or
19. ## College Chemistry

The sun bombards the earth with about 1KJ m^-2s^-1. Calculate the maximum mass of pure ethanol that can be vaporized in 10 min from a beaker left in strong sunshine, assuming the surface area of the ethanol t be 50cm^2.
20. ## Physics please check

As you climb a mountain, your ears "pop" because of the changes in (a) In which direction does your eardrum move as you climb up? inward outward eardrum does not move Give your reasoning. I think the eardrum moves outward because the further you go away
21. ## Astronomy

The volume of a ball is given in terms of its radius by V=(4*pi/3)*R^3. Use this to find the average density of Nursat, i.e. the mass per unit volume. Use Earth'€™s mass in kg from the Table of Constants to express your answer in kg/m3.
22. ## physics

Consider a system of a cliff diver and the earth. The gravitational potential energy of the system decreases by 21,000 J as the diver drops to the water from a height of 32.0 m. Determine her weight in newtons.
23. ## Physics

i have just started physics, can someone please show me step by step how to do this: The radius of Earth is 6 370 000 m. Express this measurement in km in scientific notation with the correct number of significant digits. thank you for your help
24. ## physics math

A cruise ship moves southward in still water at a speed of 20.0 km/h, while a passenger on the deck of the ship walks toward the east at a speed of 5.0 km/h .The passengers velocity with respect to Earth is?
25. ## sci

help i am having trouble with these: The three branches and three systems of geology. According to the Nebular Theory, how did the solar system develop? How is uniformitarianism related to the evolution of Earth and the solar system? i know its in my
26. ## science

On Earth as a whole, what happens to most of the presipitation? 1 It recharges the soil moisture deflict. 2 it becomes runoff and moves o the oceans. 3 it is store in the soil as capillary oceans. 4 it is returned to the atmosphere through evaporation and
27. ## EARTH SCIENCE

How will the landscape change after movement along a thrust fault? http://www.google.com/search?source=ig&hl=en&q=thrust+fault+result See if one of these sites answers your question. =)
28. ## trig

city A is 300 miles directly north of city B assuming the earth to be sphere of radius 4000 miles determine the difference in latitude in degrees of the two cities
29. ## physics

Using sidereal navigation, a pilot flies due south for one hour then due north one hour and lands about 180 miles west of where he started. At what point on Earth is he?
30. ## Physics

The intensity of an earthquake wave passing through the Earth is measured to be 2.5×106 J/m^2 at a distance of 48 km from the source. What was its intensity when it passed a point only 2.0 km from the source? At what rate did energy pass through an area
31. ## sci 207

The idea of tectonic plates shifting across the earth’s surface is central to explanations of geologic processes. Why is this idea still called the “theory” of plate tectonic movement
32. ## Physics tough

If approximately 70% of the Earth's surface is covered with water, what is the order of magnitude for the number of raindrops in the world's oceans? Hint: The order of magnitude of 2478=2.478×10^3 is 3.
33. ## Physics

Near the equator, the Earth's magnetic field point almost horizontally to the north and has a magnitude of B = 50 micro T. What should be the magnitude and direction for the velocity of an electron if its weight is to be exactly balanced by the magnetic
34. ## math

At a certain range of depths, the temperature of Earth's interior, in degrees Celsius, is expressed as 10d+20, where d is the depth in kilometres. Determine the temperature at a depth of 15km. I really don't get this, plz help!
35. ## College Physics

The masses of the earth and moon are 5.98 × 1024 and 7.35 × 1022 kg, respectively. Identical amounts of charge are placed on each body, such that the net force (gravitational plus electrical) on each is zero. What is the magnitude of the charge placed on
36. ## Science

The intensity of an earthquake wave passing through the Earth is measured to be 1.5×10^6 J/m^2*s at a distance of 58km from the source. What was its intensity when it passed a point only 2.0 km from the source? At what rate did energy pass through an area
37. ## Social studies

Which of the following describes a canal? (1 A flat-bottomed boat that carries goods B prehistoric period when Earth was covered with ice C gated part of a river that raises or lowers the water level D waterway dug across land for ships to go through
38. ## Physics

A military helicopter on a training mission is flying horizontally at a speed of 60.0 m/s and accidentally drops a bomb (fortunately not armed) at an elevation of 350 m. You can ignore air resistance. Find the horizontal and vertical components of its
39. ## Earth Science

1Which statement best illustrates a classification system? (1)A glacier melts at the rate of one meter per year. (2)Ocean depths are measured using sound waves. (3)Snowfall predictions for winter storms vary. (4)Stars are grouped according to color. Is it
40. ## English

Slaughter House Five For whatever reason, Billy cannot tell his wife, Valencia, about his Dresden experiences but fluidly recounts minute derails to Montana Wild hack. Why is this? Is she form of earth mother? A fantasy for bored, middle-aged married men?
41. ## english

can you please help me correct these sentances so it sounds better. During sunset the sun falls and an evening star progressively emerges. To the poet, this event may symbolize the rising of the dead from earth and entering of the soul to heaven. i want
42. ## science

Objects take up space and move through space different ways. Scientists use these differences to make models. For example, how a rubber band stretches helps you "see" the force acting on it. How could you use space relationships to model Earth and its
43. ## Biology: Evolution

Scientists suggest that two energy sources, __________ and __________, broke the bonds in the gases in Earth's primitive atmosphere, releasing atoms to form __________. Help! I forgot my book at school! Please!
44. ## Physics

Suppose a straight 1.50 mm -diameter copper wire could just "float" horizontally in air because of the force due to the Earth's magnetic field B, which is horizontal, perpendicular to the wire, and of magnitude 3.0×10−5 T . What current would the wire
45. ## PHSC

In a simulation on earth,an astronaut in his space suit climbs up a vertical ladder.On the moon,the same astronaut makes the same climb.In which case does the gravitational potential energy of the astronaut change by a greater amount?
46. ## Physics

In a simulation on earth, an astronaut in his space suit climbs up a vertical ladder. On the moon, the same astronaut makes the same climb. In which case does the gravitational potential energy of the astronaut change by a greater amount?
47. ## science

Which of the statements below are true? a) The surface of the sun is over 10,000 degrees F B) The sun is hot enough to heat the earth and give light to the planets c) The sun will continue to burn for at least another 5 billion years d) all of the above
48. ## physics

A 3.61 kg ball is dropped from the roof of a building 152.5 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 11.6 N on the ball. How long does it take to hit the ground? The acceleration of gravity is 9.81 m/s^2
49. ## physics

A 4.05 kg ball is dropped from the roof of a building 171.4 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 12.5 N on the ball. How long does it take to hit the ground? The acceleration of gravity is 9.81 m/s^2.
50. ## physics

A 3.60 kg ball is dropped from the roof of a building 184.8 m high. While the ball is falling to earth, a horizontal wind exerts a constant force of 12.1 N on the ball. How long does it take to hit the ground? (acceleration of gravity = 9.81 m/s^2)
51. ## Ela and this is my last question

At the Earth’s Core Edgar Rice Burroughs 1 “Let’s have a look beyond that door, David,” he cried. 2 Together we stepped out to stand in silent contemplation of a landscape at once weird and beautiful. Before us a low and level shore stretched down
52. ## Science

Identify and describe the 3 main categories of trans-Neptunian objects. The three main categories of trans-Neptunian objects are Planetoids, the Kuiper Belt, and the Oort cloud. Planetoids are dwarf or minor planets, natural satellites, and minor bodies.
53. ## earth

#40 which type of rock is a result of a rock changing by heat and pressure? a. metamorphic rock b. igneous rock c. sedimentary rock d. metal ores
54. ## Chemistry please check

1. Which of the following would occur as saturated hydrocarbons? alkanes alkenes alkynes cycloalkynes ans: alkanes 2. There are millions of organic compounds but only thousands of inorganic compounds because atoms of elements other than carbon never
55. ## Social Impact of Technology

Which of these kinds of energy is a fundamental requisite for life on Earth? A. Electrical energy B. Solar energy C. Chemical energy D. Potential energy An -- C
56. ## 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 562
57. ## science

cyanobacteria,wich first appeared on earth over 3 billion yaers ago are? a.austrolopithecines b.prokaryotes c.one of the organisms on land d.descendents of primitive plants http://en.wikipedia.org/wiki/Cyanobacteria Read 1st Paragraph
58. ## Chemistry

In the troposphere the atmospheric pressure decreases about 10 kPa and the temperature decreases about 279 K for every kilometer above the earth's surface you go. As a weather balloon released from the ground rises up will its volume increase, decrease or
59. ## Astronomy

Hey There! Thank you for checking my question! ____ 8. The stars do not appear in the same place every night due to Earth’s (1 point) a) solar day. b) orbital motion around the sun. c) right ascension. d) seasonal change. My Answer: B Could someone
60. ## Earth Science

Which aquartic biome would cypress, cedar, and dogwood trees, and submerged floating plants ne located? Lakes and Ponds Streams and RIvers Swamps Freshwater Marsh Saltwater Marsh Intertidal Zone
61. ## physics

when a automobile moves overe a wide, closed loop of embedded in a road surface, the magnetic field of the earth within the loop altered? is a pulse of current produced? can you cite a pratical application for this at a traffic intersection?
62. ## Physics

When an automobile moves over a wide, closed loop of wire embedded in a road surface, the magnetic field of the Earth within the loop altered? Is a pulse of current produced? Can you cite a practical application for this at a traffic intersection?
63. ## Physics

When an automobile moves over a wide, closed loop of wire embedded in a road surface, is the magnetic field of the Earth within the loop altered? Is a pulse of current produced? Can you cite a practical application for this at a traffic intersection?
64. ## Chemistry

A weather balloon with a volume of 3.86934 L is released from Earth’s surface at sea level.What volume will the balloon occupy at an altitude of 20.0 km, where the air pressure is 10 kPa? Answer in units of L
65. ## Science

1) How does water vapour change into solid and liquid water above earth's surface? 2)does all surface runoff move directley into lakes, rivers and oceans? Please help asap it means alot!
66. ## Physics

The solar radiation incident on the Earth has a power density of approximately 900W/m2. Find the rms value of the electric field. I know that Erms = Emax/squareroot(2) But how can I pass from W/m^2 to electric field?
67. ## Earth Science

Which of the following does NOT occur at a convergent boundary? A. The leading edges of both plates are bent downward. B. Oceanic crust is pushed down into the mantle. C. One continental plate moves into an oceanic plate. I think it's C
68. ## college physics

The intensity of an earthquake wave passing through the Earth is measured to be 2.5×10^6 J/m^2 at a distance of 43 km from the source. What was its intensity when it passed a point only 2.0 km from the source? AND At what rate did energy pass through an
69. ## PHYSICS HELP! PLEASE!

On the moon, the downward acceleration dur to gravity is only about one-sixth as large as it is on earth. if a 16 kg rock is put on a spring scale on the moon. What would the scale read? Give your answer in newtons.
70. ## chemistry

An atom has a valence shell configuration of ns2p5. To which group of elements in the periodic table does it belong? transition metals Halogens alkaline earth metals alkaline metal
71. ## chemistry

An atom has a valence shell configuration of ns2p5. To which group of elements in the periodic table does it belong? transition metals Halogens alkaline earth metals alkaline metal
72. ## Physics

A rocket is launched from rest. After 8.0 min, it is 160 Km above the Earth’s surface and is moving at a speed of 7.6 Km/s. Assuming the rocket moves up in a straight line, what are its (a) average velocity and (b) average acceleration?
73. ## Physics

The potential difference between a storm cloud and the ground is 2.13 Ã— 108 V. If a bolt carrying 2 C falls from a cloud to Earth, what is the magnitude of the change of potential energy of the charge? Answer in units of J.
74. ## 3rd grade science

Solar System Project: I would like to know if the moon is between earth and mars. I am making a shoe box model of the solar system. I have to put the planets in order. That's all I need to know. Thanks a bunch!!!
75. ## physics

questoins asked in a physics lesson which i find hard to answer: 1) do all objects have the same acceleration when they fall to earth? explain the answer. 2) what is the difference between weight and mass? any help would be greatly appreciated :)
76. ## science

Say you have a million dollars that you can invest into a bank account for 10% interest each year. how much money will you have each year to live off of? If you use more than amount,what happens to your original capital? What happens to your
77. ## math

a pit is dug in the shape of a cuboid with dimensions 10m*8m*3m. the earth taken out is spread evenly on a rectangular plot of land with dimensions 40m*30m. what is the increase in the level of the plot.
78. ## Physics

A projectile is fired from the surface of the Earth with a speed of 200 meters per second at an angle of 30° above the horizontal. If the ground is level, what is the maximum height reached by the projectile? (A) 5 m (B) 10 m (C) 500 m (D) 1,000 m (E)
79. ## PHYSICS

A straight 1.2 m length iron rod is moved at 10 m/s through the earth's magnetic field at a location where it has magnitude 1.0 × 105 T. What is the magnitude of the induced emf between one end of the wire and the other end? What formula do I use?
80. ## Physics

A projectile is fired from the surface of the Earth with a speed of 200 meters per second at an angle of 30° above the horizontal. If the ground is level, what is the maximum height reached by the projectile? (A) 5 m (B) 10 m (C) 500 m (D) 1,000 m (E)
81. ## Physics

A projectile is fired from the surface of the Earth with a speed of 200 meters per second at an angle of 30° above the horizontal. If the ground is level, what is the maximum height reached by the projectile? (A) 5 m (B) 10 m (C) 500 m (D) 1,000 m (E)
82. ## earth

Can someone give me a better idea of Precipitation Variability ? and the 4 types of atmospheric lifting, I'm confused and want to understand this better. Convective Lifting Orographic Lifting Frontal Lifting Convergent Lifting
83. ## Earth Science

can someone help me? you are given a sample of an unknown mineral. you determine that the mineral's streak is whte and its specific gravity is 2.8. is the mineral most likely to be a metallic mineral or a nonmetallic mineral? explain your answer. please
84. ## 10th grade

Which planet has the gravitational force that is closest to Earth's gravitational force?
85. ## science

How are moon observations from space different from moon observations made on Earth? I think there is no deifference.
86. ## Physics

What is the period of Earth's (nearly) circular motion around the Sun? (2*pi*r)/T 1 year (1 year)/(2*pi) (2*pi)/(1 year) 2*pi*(1 year)
87. ## physics

how high above the surface of the Earth would an object need to be for its weight to be half its weight on the surface?
88. ## science

Imagine that you were on the moon (which has an acceleration rate 1/6 that of earth's 9.8 m/s) What would it's gravitiational acceleration rate be?
89. ## physics

how high above the surface of the Earth would an object need to be for its weight to be half its weight on the surface?
90. ## Science

If the acceleration gravity is 1.6m/2 on the moon and you weigh 539 N on earth, how much do weigh on the moon?
91. ## physics

Can water,air and earth conduct electricity? If yes, then explain how they conduct electricity.
92. ## Science

what is the source of the energy in the greenhouse? what is the source of energy entering Earth's atmosphere?
93. ## Physics

Knowing the temperature at the surface of the Earth to be 72 F, find the temperature at the surface of Venus.
94. ## science

A rock sample weight 60N on earth. what would be the weight of the same rock on moon?
95. ## earth science

the Julian calendar is the calendar we currently use. True or false. my guess is true
96. ## Science

A 13.0 kg block of concrete rests on a 5 cm by 2 cm board. What is the acceleration of the block of concrete here on Earth?
97. ## physics

Suppose a simple pendulum is used to measure the acceleration due to gravity at various points on the Earth. If g varies by 0.151 % over the various locations where it is sampled, what is the corresponding variation in the period of the pendulum? Assume
98. ## Earth Science

Seismic waves move faster through which of the following media? a.) water b.) steel c.) oxygen d.) oil Please answer my study guide is due Monday and the teacher hasn't gone over this I looked through my notes and everything. It would really help if you
99. ## Physics

A person can jump a maximum horizontal distance (by using a 45 degree projectile angle) of 3 m on Earth. The acceleration of gravity is 9.8 m/s2. What would be his maximum range on the Moon, where the free-fall acceleration is g/6 ? Answer in units of m
100. ## earth

waste produced by people along the east coast of the united states has been dumped into the atlantic ocean where it is distriuted y surface ocean currents, Which coastel area is most liekly to become polluted by this waste?