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

25,660 results, page 45

1. ### physics

Calculate the tidal force experienced by Io. How does it compare to the tidal force experienced by the Moon due to the Earth? What would the Earth-Moon distance (i.e., distance between their centres) need to be in order for the Moon to experience similar tidal forces to those ...
2. ### Math

1. Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on earth also varies according to the elevation of the object? In particular, the weight of an object follows this equation: , where C is a constant, and...
3. ### Math

1. Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on earth also varies according to the elevation of the object? In particular, the weight of an object follows this equation: , where C is a constant, and...
4. ### algebra

0. Tell your classmates about your pet to set up the scenario for fencing a rectangle in your yard. 1. You MUST start by choosing an amount of area that you want to fence in for your pet and this MUST be stated first. What amount of area are you enclosing with a fence for your...
5. ### Statistics

If a researcher were studying the effects of a teaching method on patient learning outcomes, how must he or she word the hypothesis to use a t-test to test for statistical differences? What type of data must he or she collect? Why?
6. ### Statistics

If a researcher were studying the effects of a teaching method on patient learning outcomes, how must he or she word the hypothesis to use a t-test to test for statistical differences? What type of data must he or she collect? Why?
7. ### Biology

You have a bacterial suspension and you need to dilute it to 0.0010 of the initial concentration so that you can determine the number of colonies per milliliter. The volumes must be between 0.1 and 2 ml. Your final volume must be 1 milliliter.
8. ### Physics

In deep space, a small rock orbits an asteroid. The circular, orbit radius (between their center of masses) is 1037 m and the velocity of the rock is 8.02 m/s. Find the mass (kg) of the asteroid. G=6.67x10^-11 m^3/kgs^2. I got 1.0x10^15 but that is incorrect.
9. ### Science

Which of the following must be true about the structures of axons and muscle cells in order for nerve impulses to stimulate muscle contraction? a- Axons and muscle cells must both have structures that make and secrete the same small molecules. b- axons and muscle cells must ...
10. ### Science

Which of the following must be true about the structures of axons and muscle cells in order for nerve impulses to stimulate muscle contraction? a- Axons and muscle cells must both have structures that make and secrete the same small molecules. b- axons and muscle cells must ...
11. ### Science

Which of the following must be true about the structures of axons and muscle cells in order for nerve impulses to stimulate muscle contraction? a- Axons and muscle cells must both have structures that make and secrete the same small molecules. b- axons and muscle cells must ...
12. ### Astronomy

Need some help with Astronomy. I need to figure out the acceleration of gravity on the surface of certain planets. For example, I need to find the acceleration of gravity on Mars when the mass is .11 times the mass of Earth and the radius is .53 times the radius of Earth. ...
13. ### Accounting

If Tom, an accountant, agrees to provide accounting services to Carl, a friend, in exchange for Carl fixing Tom's office floor, then: (Points : 1) Tom must report income on his tax return. Carl must report income on his tax return. Neither Tom nor Carl must report income on ...

15. ### Physics

The average intensity of sunlight at earth's surface is approximately 1400 W/m^2 , if the Sun is directly overhead. The average distance between the earth and the sun is 1.50E11 m. What is the average power emitted by the Sun? Ok so intensity is power over area. so power is ...
16. ### Physics

An iorn rod (a=11.8 x 10^-6C^-1) has a length of 1000 meters(or 1 km) at 0 degrees Celsius. If the rod must expand 10 cm to bridge a gap, to what temperature must the rod be heated?
17. ### physics

An iorn rod (a=11.8 x 10^-6 C^-1) has a length of 1000 meters(or 1 km) at 0 degrees Celsius. If the rod must expand 10 cm to bridge a gap, to what temperature must the rod be heated?
18. ### physics

An iron rod has a length of 1000 meters (or 1 km) at 0 degrees Celsius. If the rod must expand 10 cm to bridge a gap, to what temperature must the rod be heated?
19. ### earh science

earths early atmosphere formed during the archean era. Which gas was generally absent from the atmosphere at this time http://en.wikipedia.org/wiki/Earth's_atmosphere#Evolution_of_the_Earth.27s_atmosphere
20. ### Physics

This is my homework problem: "The pilot of a plane is flying at 450 mi/hr W 20.0 degrees S relative to the earth. She sees another plane flying at 350 mi/hr N 40.0 degrees W relative to her plane. What was the magnitude and direction of the plane she saw relative to the earth...
21. ### Physics pls help

A proton is moving in a circular orbit of radius 11.8 cm in a uniform magnetic field of magnitude 0.232 T directed perpendicular to the velocity of the proton. Find the orbital speed of the proton. Answer in units of m/s. I came up with .118/2.83x10^-7 and it was incorrect.
22. ### Science

The electron in a helium ion moves from a Bohr's orbit whose principal quantum number is 4 to another whose quantum number is 6.calculate the energy of transition in this process.

The gravitational force on the moon is one -sixth of what it is on Earth. This means that on the Moon you would weigh one-sixth of what you weigh on Earth. How much would you weigh on the moon.
24. ### Science/Weather

Satellite images help meteorologists in all the following ways except: a) monitoring changes in the strength of storms b) locating areas of high and low pressure systems. c) predicting rainfall amounts d) recording daily high and low temperatures. I think the answer is c or d...
25. ### geography

Compare and contrast folded mountains to volcanic mountains. How they are alike? How they are different? i got some of it.. Similarities: Both were probably formed from convergent plate boundaries. Difference: Volcanic Mountains - are mountains that form when molten rock ...
26. ### science

An astronaut who weighed 170 pounds on Earth found that his weight on Jupiter was 400 pounds. He captured an alien that weighed 120 pounds on Jupiter. What is the alien's weight on Earth? A. 34 pounds B. 51 pounds C. 78 pounds D. 283 pounds
27. ### math

The diameter of the Earth is approximately 7920 miles. Given that the circumference of a circle is _ times its diameter, which statemnt best describles the length of a trip from Washington to Madagascar that is approximately 8600 miles long? Your question is lacking the ...
28. ### physics

Your friend weighs 145 lb. What is her mass in kilograms if she went to the moon where the acceleration of gravity is 1/6 that on earth? i know that her weight in newtons is 652.5, and that her mass in kilograms is 65.25, and that her weight in newtons if she went to the moon ...
29. ### World History

Which statement supports the claim that the political philosophy of John Locke was as revolutionary as the scientific revolution of Copernicus? *****a. Just as Copernicus replaced the Earth with the Sun at the center of the solar system, Locke replaced the individual with the ...
30. ### Science

According to science, the fastest speed posssible for anything is the speed of light. The speed of light is about 186,000 mies per second. That means that in one minute, lighttravels 11,160,000 miles. The star nearest Earth is the Sun. It's about 93,000,000 miles from Earth. ...
31. ### need HELPwith 2 questions!!

How long is day and how long is night? Does the sun come up in the morning all over the world? Explain please help me I only need: How long is day and how long is night? Does the Sun come up in the morning all over the world? Please explain to me. At any given time, how much ...
32. ### English

I have to identify if the verb is transitive or intransitive. 1.Eddie must be the fastest runner on the team. 2. We were the largest class in the history of the school. 1.must be=intransitive 2.were=intransitive
33. ### physics

An iron rod(a=11.8x10-6 C-1) has a length of 1000 meters (or 1 km) at 0 degrees Celsius. If the rod must expand 10 cm to bridge a gap, to what temperature must the rod be heated?
34. ### Math

If a worker wants to pack 200 newly harvested mangoes at average size of 3&quot;x2&quot; in delivery boxes .To optimize the cost and profit in packaging , the mangoes must be properly packed in boxes of similar sizes. To systemize counting , there must also be equal ...
35. ### Physics

At a place directly below a thundercloud, the induced electric charge on the surface of the Earth is +1.0 X 〖10〗^(-7) coulomb per square meter of surface. How many singly charged positive ions per square meter does this represent? The number of atoms on the ...
36. ### English

Which is an example of verbal irony as spoken by Antigone? a. "You have yourself to consider, after all." b. "You must decide whether you will help me or not." c. ". . . and if I must die, / I say that this crime is holy . . ." d. ". . . if it means death, / It will not be the...
37. ### Science

Do you know how big the Sun is? The Sun is 400 times as big as the Moon and 400 times as far away. The Moon: 2.5mm diameter a) How big would the Sun be if the Moon were the size shown above? b) The Sun is actually about 865,000 miles in diameter, so 1 cm of the model ...
38. ### Statistics 250

Final averages are typically approximately normally distributed with a mean of 65 and a standard deviation of 8. Your professor says that the top 10% of the class will receive an A; the next 20%, a B; the next 41%, a C; the next 19%, a D; and the bottom 10%, an F. (Give your ...
39. ### science

the sun sets, fully disappearing over the horizon as you lie on the beach, your eyes 10 cm above the sand. you immediately jump up, your eyes now 130 cm above the sand, and you can again see the top of the sun. If you count the number of seconds (=t) until the sun fully ...
40. ### algebra 2

You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1.1. the weight of an object follows this equation: , where C is a constant, and r is the distance that the object is from the center of the earth...
41. ### Physics

It can be shown that for a uniform sphere the force of gravity at a point inside the sphere depends only on the mass closer to the center than that point. The net force of gravity due to points outside the radius of the point cancels. How far would you have to drill into the ...

In the definition of intercepts, it says THE y-intercept, but AN x-intercept. Sketch a graph which shows that a function could have more than one x-intercept. Explain why a fuction could not have more than one y-intercept. How about the x-axis? If it had two y intercepts then ...
43. ### Earth/Space Science

How does damage to the ozone layer cause a threat to humans? A. It increases radiation of heat from Earth into space. B. It allows damaging infrared radiation to penetrate the atmosphere. C. It allows damaging ultraviolet radiation to penetrate the atmosphere. D. It increases ...
44. ### physics

The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × 1024 kg, mass of moon=7.35 × 1022 kg. The distances shown in the drawing are rSM = 1.50...
45. ### physics

The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × 1024 kg, mass of moon=7.35 × 1022 kg. The distances shown in the drawing are rSM = 1.50...
46. ### English

Which of the following italicized words is correcly capitalized? 1) The most beautiful "State" is Hawaii. 2) Jim must drive to the "North" to study the northern lights. It must be #2, I don't believe state is capitilized in this sentence.
47. ### Calc

(1/1+(4/n))(4/n)+(1/1+(8/n))(4/n)+(1/1+(12/n))(4/n)+....+(1/1+(4n/n))(4/n) is a right Riemann Sum for a certain definite integral. Integral 1 to b, f(x) dx. using a partition of the interval [1,b] into n subintervals of equal length. Then the upper limit of integration must be...
48. ### Math

Uranus is approximately 2.74 x 10^9 km away from the Sun at perihelion and 3.00 x 10^9 km at aphelion. Find the eccentricity of Uranus's orbit given that the perihelion is r = a(1 - e) and the aphelion is r = a(1 + e).
49. ### ss

what are latitude and longitude? lines of __________ and lines __________ cross one another. they form a ____________ around the earth. lines of latitude lines of latitude are also called___________ they circle the earth parallel to the_______ they measure north and south of ...
50. ### Psychology

Jiskha Support Team, I am supposed to do a written assignment however I am having a problem with understanding instruction number #1 and #3 #1 through #4 is part of the requirement for my written paper #1). Must include an introductory paragraph with a succinct thesis. X #2). ...
51. ### Math

Earth has a new surface of 1.97x10^8 square miles. A new planet has a surface area 13 times the surface area of Earth. What is the surface area of the new planet? Do I multiply 1.97x13 or do I multiply 13x10^8? that's what i'm confused about.
52. ### physics

On average, the electron and proton in a hydrogen atom are separated by a distance of (5.3 x 10 -11 m), assuming the orbit of the electron to be circular, (a) what is the electric force on the electron? and (b) WHat is the electrons orbital speed? and (c) What is the magnitude...
53. ### physics

Solar luminosity is estimated to have been 30% lower than today at the time when the solar system formed, 4.6 billion years ago. (a) If Earth's albedo was the same as it is now (A=0.3), what would have been its effective radiating temperature Te at that time? (b) If the ...
54. ### astronomy

Observations with the Hubble Space Telescope revealed a planet about 16 AU from a star whose mass is the same as our Sun’s mass. How long does it take the planet to orbit the star?
55. ### physics

an atom is placed in a uniform magnetic induction B. such that its plane normal to the electron orbit makes an angle of 30 degrees with the magnetic induction the torque acting on the orbiting electron?
56. ### English

1. You must be honest. 2. You have to be honest. (Situation: The person is not honest, so the boss is scolding the man.) 3. You must be honest. 4. You have to be honest. 5. I am sure that you are honest. (The man was honest, and the boss knows it, so he said this way...
57. ### physics

Find the speed at which Superman (mass=89.0 kg) must fly into a train (mass = 19564 kg) traveling at 65.0 km/hr to stop it. The system (train + Superman) must end up with zero momentum. With no external forces, Superman's initial momentum must be equal and oppositely directed ...
58. ### Physics

The weight of an astronaut plus his space suit on the Moon is only 270 N. A. How much do they weigh on Earth, in Newtons, assuming the acceleration due to gravity on the moon is 1.67m/s^2= 1584is this right? B. What is the mass of the astronaut and his space suit on the moon ...
59. ### s

According to science, the fastest speed possible for anything is the speed of light. The speed of light is about 186,000 miles per second. That means that in one minute, light travels 11,160,000 miles. The star nearest Earth is the Sun. It's about 93,000,000 miles from Earth. ...
60. ### Earth science

What prevents life from developing on land before Earth’s atmosphere contained a significant portion of oxygen? (1) All land locations were too hot for life to exist. (2) All terrestrial environments were too cold for life to even exist. (3) All forms of life require ...
61. ### Math

A landscape architect is designing a new park for the city.His design must include the following types of figures. Exactly 4 boundary segments Exactly 1 pair of boundary segments must be parallel The intersection of at least two of the boundary segments must form an obtuse ...
62. ### science

a experiment to prove that a freely suspended or floating magnet always point in the north south direction plz help got my trails!??!?!?! how do i get the ans to this question?????? That doesn't look like a question. It looks like a suggested experiment to prove a hypothesis. ...
63. ### Chemistry

A NASA satellite showed that in 2003 the ozone hole was much larger than it was in 2002. The 2003 hole measured 1.04 x in diameter, while the diameter of the 2002 hole was 6.9 x Calculate the difference in size between the two holes in square meters
64. ### physics

is this right? a 50kg barbell can be lifted by usinga force of 180 N. what is the force of gravity on this planet? if the same barbell is lifted on earth, what minimal force is needed? -i got 3.6 for gravity of the unnamed planet; and 49 N for the minimal force to be lifted on...
65. ### Science

Why is only one side of the moon visible from the earth at all times? Only one side of the moon is visible from the earth at all times because the other side is illuminated by the sun, which doesn't face us. Please correct me if I'm wrong, thanks :-)
66. ### child

In preparing a budget for a day care center, you must plan for taxes. As an employer, you must pay part of each employee’s _______ tax. A. Social Security C. state income B. federal income D. local
67. ### chid

In preparing a budget for a day care center, you must plan for taxes. As an employer, you must pay part of each employee’s _______ tax. A. Social Security C. state income B. federal income D. local
68. ### religion

According to the Cow (2nd sura of Qur’an), Muslims a) must not be the aggressor in war b) should avoid violence at all cost c) must formally declare war before attacking d) may not mistreat captives
69. ### algebra

You decide to market your own custom computer software. You must invest \$3,255 for computer hardware, and spend \$2.90 to buy and package each disk. If each program sells for \$13.75, how many copies must you sell to break even?

According to science, the fastest speed possible for anything is the speed of light. The speed of light is about 186,000 miles per second. That means that in one minute, light travels 11,160,000 miles. The star nearest Earth is the Sun. It's about 93,000,000 miles from Earth. ...
71. ### Philosophy

True/False 1. Rosenstand argues that moral subjectivism is an intuitively sound, "live and let live" kind of moral position that is both appealing and socially cohesive. 2. For the members of the Flat Earth Society, who believe that all physical evidence of a round or ...
72. ### Philosophy

True/False 1. Rosenstand argues that moral subjectivism is an intuitively sound, "live and let live" kind of moral position that is both appealing and socially cohesive. 2. For the members of the Flat Earth Society, who believe that all physical evidence of a round or ...
73. ### Physics

A man of mass 75.5 kg walks down the aisle of an airplane at a speed of 1.50 m/s in the forward direction while the plane moves at a speed of 305 m/s relative to the earth. (a) Find the man's kinetic energy relative to the plane. (b) Find the man's kinetic energy relative to ...
74. ### NCSU

A man of mass 83.5 kg walks down the aisle of an airplane at a speed of 1.60 m/s in the forward direction while the plane moves at a speed of 295 m/s relative to the earth. (a) Find the man's kinetic energy relative to the plane. (b) Find the man's kinetic energy relative to ...
75. ### physics

A man of mass 78.5 kg walks down the aisle of an airplane at a speed of 1.40 m/s in the forward direction while the plane moves at a speed of 320 m/s relative to the earth. (a) Find the man's kinetic energy relative to the plane. (b) Find the man's kinetic energy relative to ...
76. ### genetic information

I am doing a small (paragraph) section on the requirements of genetic information and I probably will put some of this in. It can be over anything. Is the below all correct? It must be an information carrier. It must be resistant to change. It must be able to run a cell. It ...
77. ### Astronomy

If a space probe were sent into orbit around the sun that brought it as close as 0.5 AU to the sun and as far away as 5.5 AU, what would its orbital period be? Can I use Kepler's 3rd law for this? I'm not sure how to take into account both AUs...
78. ### english

Please help if my answers are correct and let me know the correct answers below. thank you. Can we see (1) _____ the earth is a globe? Yes, we can. When we watch a ship that sails out to sea, we can see that the ship begins (2) _____. The bottom of the ship disappears first, ...
79. ### EARTH SCIENCE

Cumulus and stratus clouds belong to which cloud group? A. Puffy clouds B. High clouds C. Middle clouds D. Low clouds Is it A? What is the basic cause of ocean tides? A. Gravitational force of volcanic activity B. Gravitational attraction between the Moon and the entire solar ...
80. ### Physics

A spacecraft approaching the earth launches an exploration vehicle. After the launch, an observer on earth sees the spacecraft approaching at a speed of 0.74c and the exploration vehicle approaching at a speed of 0.98c. What is the speed of the exploration vehicle relative to ...
81. ### Science

The density of the sun's core is about 160 g/cm. The density of the earth's core is about 13.0 g/cm. About how many times denser is the sun's core than Earth's?
82. ### Ethics

1. Hill claims that a fruitful way to think about the badness of destroying the environment is? To think about what kind of human would choose to destroy the earth. To appeal to theories about God and care for the earth. To examine people’s intuitions about whether it is ...

According to science, the fastest speed possible for anything is the speed of light. The speed of light is about 186,000 miles per second. That means that in one minute, light travels 11,160,000 miles. The star nearest Earth is the Sun. It's about 93,000,000 miles from Earth. ...
84. ### statistics

11. You are taking a multiple choice examination that has 20 questions in a particular section with 5 possible answers for each question. You did not study for the test and you guessed the answers. The probability that you will get at least 50% of the problems correct by ...
85. ### Physics

Hi! I need some help with some physics questions. 1. When two point charges are moved farther apart, what is true about their resulting electric and gravitational forces? a. both forces stay the same b. gravitational force stays the same but electric force increases c. ...
86. ### Help with physics!

Hi! I need some help with some physics questions. 1. When two point charges are moved farther apart, what is true about their resulting electric and gravitational forces? a. both forces stay the same b. gravitational force stays the same but electric force increases c. ...
87. ### Physics

Horizontal electric power lines supported by vertical poles can carry large currents. Assume that Earth’s magnetic field runs parallel to the surface of the ground from south to north with a magnitude of 0.50××10^-4 Tesla and that the supporting poles are 38 m apart. Find ...
88. ### English

Can you please help me complete the fill-in-the-blank activity, please? I'm not sure if the rules in America are the same as in England. 1)You can get a part-time job when you are 15 years old. You can ride a 50cc moped when you are 14 years old. You can't leave school until ...
89. ### Earth Science

I need help with igneous rocks and the rock cycle. Is there a web site that will help me. One question is When magma cools below Earth's surface, it forms __________-grained, _________ igneous rocks. fine grained for your other word read: http://en.wikipedia.org/wiki/Igneous_rock
90. ### Astronomy

Assume that right now the Moon is full, Mercury is at superior conjunction, Venus is at greatest western elongation, and Mars is at opposition. Draw a simple sketch of the solar system, showing the relative positions of the Sun, Earth, the Moon, Mercury, Venus and Mars. Draw ...
91. ### science

Why does the Earth get more energy from the Sun compared to any other star? •The Sun is much closer to Earth. The next closest star is 4.2 light years away. **** • The Sun is much denser than other stars. That means it produces more energy. • The Sun is much hotter than ...
92. ### math/science

The total surface area of Earth is about 1.97 × 10^8 square miles. The surface area of land on Earth is about 5.73 × 10^7 square miles. Find the ratio of surface area of land to that of the entire planet.
93. ### GLOBE/GEOGRAPHY HELP

Rotate the Earth using the arrows on the globe that show the direction of rotation. As viewed from the North Pole, what direction is the Earth spinning? clockwise or counter-clockwise? I suggest you do this exercise in class, since that globe apparently has arrows that show ...
94. ### science

Which of the following best supports the idea that the melting of glaciers in Antarctica is a global environmental threat? A. The melting of glaciers can cause sea levels on Earth to fall. B. The melting of glaciers can change ecosystems in Antarctica. C. The melting of ...

Which of the following is NOT one of the key requirements for auditor independence? A. Auditors must disclose all other written communications between management and themselves. b. Public accounting firms must report if they are providing audit services to any company whose ...
96. ### science

Discuss how comets might have a role to play in life evolving on an earth-like extrasolar planet in a distant solar system. can some one please help me out here. If life came to Earth via a comet, wouldn't it make sense to predict that some comet could carry life to some other...
97. ### Physics

The Earth's magnetic field above the Earth's equator is about 10^-4 north. If a proton is intially moving downward at 5*10^5 m/s, it will? A. curve east, making a circle with r= 50 m. B. curve west, making a circle with r=50 cm C. curve east, making a circle with r= 3 cm D. ...
98. ### Physics

The moon rotates about its axis every 27.3 days and orbits the earth every 27.3 days. A) what is the moment of inertia with respect to its axis? B) What is the moment of inertia with respect to the earth? C) What is the moons angular momentum with respect to its axis? D) WHat ...
99. ### physics

1)The acceleration due to gravity on the moon is 1.67 m/s2. If a person can throw a stone 12.0 m straight upward o the earth, how high should the person be able to throw a stone on the moon? Assume that the throwing speeds are the same in two cases. The height H attained when ...
100. ### PHYSICS HELP

Suppose the aliens watching the show are on the surface of Mars. Mass of Mars: 6.42 x 10^23 kg Radius of Mars: 3.394 x 10^6 m Calculate; A) the weight of a 40.0 kg alien on Mars B) the weight of 40.0kg alien on earh Earth-sun distance:1.50x10^11m Mars-sun distance: 2.28 x10^11...