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

25,660 results, page 78

1. ### 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
2. ### english

Which of the following is not characteristic of the suras in the Koran? a. They are lyrical passages. b. They are written in rhymed Arabic verse. c. They emphasize the mercy of Allah. d. They emphasize the richness of life of earth. i think the answer should be D. am i right?
3. ### science

The acceleration due to gravity calculated this way works well for objects near the Earth’s surface. How would you have to change the above equation if the object was 100,000 meters above the ground?
4. ### Physics

The acceleration due to gravity calculated this way works well for objects near the Earth’s surface. How would you have to change the above equation if the object was 100,000 meters above the ground?
5. ### geometry

Earth completes one full rotation each day, making the Sun appear to rise and set. If the Sun passes directly overhead, by how many degrees does its position in the sky change every hour?
6. ### science

Tell what you believe would happen if the earth suddenly stopped spinning and you were in the part of the world that had 24 a day.Include such things as how this would affect your sleep, work, school and crime?
7. ### Science

The inner planets- Mercury, Venus, Earth and Mars- were formed by a. Supernovas b. repeated collisions of asteroid sized debris (My Answer) ****** c. masses of cold hydrogen and helium d. collisions of large galaxies
8. ### Physics

A meteorite weighing 1860N strikes the earth with a velocity of 45.2m/s. What is its kinetic energy? Write in SN to one decimal place. When I plugged in (1/2)(1860N)(45.2m/s)^2, I got the answer 1.9e6, but it was incorrect. Please help. I'm really confused!
9. ### PHYSICS

How do I solve this? For the normal force in the drawing to have the same magnitude at all points on the vertical track, the stunt driver must adjust the speed to be different at different points. Suppose, for example, that the track has a radius of 2.87 m and that the driver ...
10. ### Social Studies 7R (Letter)

Please check this letter if it's good and if there any grammar mistakes. My most exalted Monarch - Your Majesty Queen Isabella, I am writing this letter most humbly for you to consider my request for three small ships and a crew so that I may sail west and find the shortest ...
11. ### Algebra

9. When doctors prescribe medicine, they must consider how much the drug’s effectiveness will decrease as time passes. If each hour a drug is 20% less effective as the previous hour, at some point the patient will not be receiving enough medicine and must be given another ...
12. ### Math

What must be added to 5 and 1/3 to get a sum of 9?
13. ### chemistry

why NaOH must be standardized?
14. ### Math

what must be added to 8/3 to make 2 5/6
15. ### math

if qrs/r=s what must be true?
16. ### math

if qrs/r=s and q=0 what must be true?
17. ### PreAlgebra

If x=yz, which of the following must be equal to xy? a. yz b. yz^2 c. y^2z d. z^2\y
18. ### science

what must be the genotypes of their children?
19. ### geometry

if ab=12,bc=7,and ac=19 what must be true of points a,b and c
20. ### math

what must be added to 6 3/5 to produce 3 5/6?
21. ### math

If (x+2)/2=y/5, then which of the following must be true? x/2=(y-2)/5 x/2=(y-5)/5 (x+2)/5=y/25
22. ### chemistry

If the pH of a particular solution is 2.08, then the [OH -] must be:
23. ### geometry

f y = (x + 3)2, then (-2x - 6)2 must equal which of the following?
24. ### Math

1/x+1-1/x+2=1/6 Must have 2 solutions
25. ### algebra

Variables that must be excluded from 2y^2+7y-30/y+6
26. ### Science

The sun, moon and planets all follow approximately the same path from east to west across the sky; none of them is ever seen in the far northern or far southern sky. What does this suggest about the arrangements of these members of the solar system in space? Think of terms of ...
27. ### geometry

A carpenter must ensure that a large window frame is a rectangle. If the corners are labled E,F,G, and H, the carpenter knows that EF=51 inches, FG=28 inches, GH=51 inches, and EH=28 inches. The carpenter could measure the diagonals EG and FH and verify that they are the same ...
28. ### Bio Help

Suppose two suspects in a crime have DNA profiles that match the one DNA fragment tested. What should happen next? A)Both suspects must be guilty and should be charged with the crime. B)The test should be repeated because a mistake must have occurred. C)A different hair or ...
29. ### Physics

Zero, a hypothetical planet, has a mass of 1.0x10^23 kg, a radius of 3.0x10^6 m, and no atmosphere. A 10 kg space probe is to be launched vertically from its surface. (a) If the probe is launched with an initial kinetic energy of 5.0x10^7 J, what will be its kinetic energy ...
30. ### Physical Science

1. In which of the following units is acceleration expressed? *A. Newtons B. Foot-pounds C. Kilograms D. Meters per second squared 2. A stone falls from a ledge and takes 16 seconds to hit the ground. The stone has an original velocity of 0 m/s. How tall is the ledge? A. 1,254...
31. ### math

when you are multiplying an equation how do you find like terms The ones that look alike. The numbers are like terms such as 4 or 8 or 10. The variables are like terms such as 4x or 9x or 3x but both of these like terms are different still from say 4x^2 or 19x^3. Another way ...
32. ### Physics

For the normal force in the drawing to have the same magnitude at all points on the vertical track, the stunt driver must adjust the speed to be different at different points. Suppose, for example, that the track has a radius of 4.84 m and that the driver goes past point 1 at ...
33. ### Statistics

A genetic trait is inherited in such a way that for a father with the trait, his male offspring have a 25% chance of inheriting it but his female offspring cannot inherit it. Suppose that in a certain population, 40% of offspring are male and offspring genders are independent ...
34. ### English

Which of the following is a simple sentence? A. Many are called, but few are chosen B. A penny saved is a penny earned C. Fools rush in where angels fear to tread D. If at first you don’t succeed, try, try again 2. Which of the following is a compound sentence? A. I have not...
35. ### Math

Denzal's first 3 scores in math were 90,100,90. a.what must Denzal score on his fourth test to keep his mean score at 90 or higher? b.what must Denzal score on his fourth test to keep his median test score at 90 or higher?
36. ### English

I still have a few doubts on school rules. I hope you can have a look at them. It's urgent. 1)You mustn't dirnk or eat during lessons/school hours. 2) You mustn't ask questions when your teacher explains/is explaining/during explanations. 3) You must take notes if you want to ...
37. ### Algebra 2

The commitee is planning this years prom. 500 on music 800 on the decorations 900 on the ballroom 25 per person for catering The ballroom can only hold 300 students. 35 per ticket with food. 20 per ticket without food. Must set aside 10 free pron tickets. a) create a function ...

For an investment to double in value during a 12-year period, a. What annually compounded rate of return must it earn? (Round your answer to two decimal places.) Annually compounded rate of return % b. What monthly compounded rate of return must it earn? (Round your answer to ...
39. ### Precalc

okay sorry last two questions! I promise! The sun always illuminates half of the moon’s surface, except during a lunar eclipse. The illuminated portion of the moon visible from Earth varies as it revolves around Earth resulting in the phases of the moon. The period from a ...
40. ### algebra

How do you factor numbers? 2x squared + 5x-3 for instance? 2x^2 + 5x -3 Make two sets of parentheses. ( ) ( ) The first number in each set must be such that the product will be 2x^2. Obviously, that must be 2xand 1x so put them in. (2x )(x ) The next thing in the set is the ...
41. ### math

Using this formula: V=LWH Find the volume(v)of a toy box with length (L) if 4ft, width(W)of 24in.,and height(H)of 30in. My answer:Wouldn't it be the following; V=(4)(24)(30) V=2888 Please let me know if I am correct. I believe that the formula is V=L*W*H isn't it. Please help ...
42. ### Earth Science

Which one of the following landforms would be created by outwash? 1) Moraines 2) Eskers 3) Drumlins 4) Erractics I have read all I can, but can not get this one. I am sure it is not #4 - Erractics.
43. ### Algebra

w=Cr^-2 Suppose that an object is 100 pounds when it is at sea level. Find the value of C that makes the equation true. (Sea level is 3,963 miles from the center of the earth.)
44. ### English-Accented Syllables

I don't understand how to determine how many accented syllables there are in lines of poetry... How do you tell? Example: When the north wind blows its icy air to cool the earth,
45. ### earth science

how do chemical rocks form, are some types of limestone considered a chemical rock, and what mineral does rock salt crystalize from. thank you if you choose to answer. im so stumped.
46. ### Physics

A box slides down a 30.0 degree ramp with an acceleration of 1.20 m/s^s Determine the coefficent of kinetic friction between the box and the ramp How on earth do I do this with only this amount of information???
47. ### earth science

if the planet is really small [compared to others, like Pluto], does that mean it has no gravity? like, would you fly on Pluto because it's gravitational pull isn't as strong?
48. ### physics

Mercury is an average distance of 5.79 x 107 km from the Sun. Estimate the length of the Mercurian year given that the Earth is 1.50 108 km from the Sun on the average. An explanation of how to do this would be great, thanks.
49. ### earth

limestone and marble are both used in sculpting. Limestone become marble under heat and pressure. Classify each rock and tell which would be harder to sculpt
50. ### physics 1

Antarctica is roughly semicircular, with a radius of 2000km. The average thickness of its ice cover is 3000m. How many cubic cm of ice does Antarctica contain? (Ignore the curvature of Earth).
51. ### University Physics

A 320.0 m tall tower is built on the Equator. How much faster (in m/s) does a point at the top of the tower move than a point at the bottom. The radius of the Earth is 6400 km.
52. ### Physic

The moon orbits the earth a a speed of 1.02 Kilometers per second. Use dimensional analysis to convert this speed into miles per hour. is the answer .28 m/s????
53. ### Physical Science

A man has a mass of 70 kg. A) What would his weight be on Jupiter which as an acceleration of gravity of 25m/s^2? B) What would the mass of a person have to be in order for him to weigh that amount on earth?
54. ### Physical Science

A man has a mass of 70 kg. A) What would his weight be on Jupiter which as an acceleration of gravity of 25m/s^2? B) What would the mass of a person have to be in order for him to weigh that amount on earth?
55. ### principles of physics

Calculate the force of gravity between a newborn baby (mass = 2.6 kg) and the planet Mars (mass = 6.4 * 10^23kg) when Mars is at its closest to Earth (distance = 5.6 * 10^10m).
56. ### physics

How far (in meters) above the earth's surface will the acceleration of gravity be 27.0 % of what it is on the surface? can someone please just give me an equation to figure this out please I am lost
57. ### physics

Consider the Earth and a cloud layer 600 m above the planet to be the plates of a parallel-plate capacitor. (a) If the cloud layer has an area of 2.0 km2 = 2000000 m2, what is the capacitance?
58. ### 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.
59. ### physics

Find the force of gravity between a newborn baby (mass = 2.9kg ) and the planet Mars (mass = 6.4×1023kg), when Mars is at its closest to Earth (distance = 5.6×1010m).
60. ### physics

ind the force of gravity between a newborn baby (mass = 2.9kg ) and the planet Mars (mass = 6.4×10^23kg), when Mars is at its closest to Earth (distance = 5.6×10^10m).
61. ### physics

Calculate the mass of Jupiter knowing that a person who weighs 490 N on the earth's surface would weight 1293 N on the surface of that planet. Jupiter has a radius of 7.15 × 107 m.
62. ### Science

We are having a debate in Science class. We are each given two questions to debate each other. 1. The Climate is mainly influenced the by the sun? 2. The earth has been warmer in the past?
63. ### Biology

1. When and where was the first cell born? How did it happen? 2. What are the circumstances that make the appearance of the cell in this earth? 3. What are the differences between prokaryotic and eukaryotic cell? How about plant and animal cell?
64. ### physics

suppose the experiment was conducted on the surface of the moon of about 1-6th that of the earth. If a single period takes exactly 1.00 second, how long does a period take on the moon ?
65. ### science

If sam drops a 40 kg mass from a height of 20 meters on earth how much was the potential energy of the mass before he dropped it a-800 j b-784 n-m c-800 n-m d-7840 j e- 200 j
66. ### English 10

1. In the Aztec creation story, after the gods create Earth, how do the other gods feel about the new creation? A thrilled B ashamed C angry D excited ***
67. ### Chemistry

In chemistry, we did a lab in which we had a certain mass of copper, performed multiple experiments on the copper, and at the end, extracted the copper from a solution and weighed it. The goal was that the mass of the final copper should be the same as the mass of the initial ...
68. ### english grammar

For my was Listen are Carefully: because People often think they’re listening, but are really not yet about what they’re going to say next when the other person stops talking because this way must approve effective communication white listen. But it might be difficult, try...
69. ### physics

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...
70. ### Astronomy

1. Sun-grazing comet ISON disintegrated on November, 2013. Observation of the comet suggested an elliptical orbit with period 581,480 years. What would this predict for the distance from the Sun at the orbitâ€™s aphelion, the farthest point from the Sun? Express your ...
71. ### biology

In order to maintain homeostasis, human cells must have a higher concentration of sodium ions outside the cell than inside the cell. In addition, the concentration of potassium ions must be higher inside the cell than outside the cell. Which of the following forms of cellular ...
72. ### Bio

In order to maintain homeostasis, human cells must have a higher concentration of sodium ions outside the cell than inside the cell. In addition, the concentration of potassium ions must be higher inside the cell than outside the cell. Which of the following forms of cellular ...
73. ### English

Which phrase from Marge Piercy's "To Be Use" best illustrates the poem's celebratory tone toward hard work? I want to be with people who submerge in the task, who go into the fields to harvest and work in a row and pass the bags along, who are not parlor generals and field ...
74. ### College Statistics

The brightness of sunlight at the earth's surface changes over time depending on whether the earth's atmosphere is more or less clear. Sunlight dimmed between 1960 and 1990. After 1990, air pollution dropped in industrial countries. Did sunlight brighten? Here are data and ...
75. ### chemistry

Hi I am zahra rashedi. I am student on my maser projects in sharif universityy of technology.In my project, I must be obtained optimal condition for sterilization of baby powder with Ethylene oxide. There are two problems. When baby powder was sterilizated with EtO, some of ...
76. ### Social Studies

How are these facts contribute to life on earth? *Gravity holds the sun together. *The sun is about 4.5 billion years old. *The sun is by far the largest object in the solar system.
77. ### algebra

Write a formula that relates temperature t in degrees Fahrenheit at altitude h (in thousands of feet) and a ground temperature of 65ºF. State any restrictions on h. b. Find the temperature at 11,000 ft above Earth’s surface.
78. ### English-Grammar

The underlined words (I put them in parantheses) are an example of a(n) ___________. (When the earth, moon, and sun are in line), an eclipse occurs. A. adverbial clause B. adjectival clause C. noun clause My answer is C.
79. ### science

Earth's atmosphere,oceans, and continents began to form during the first several hundred million years a) Precambrian time b) the Paleozoic era c) the Mesozoic era d) the Cenozoic era
80. ### physics

we have learnt that Earth's gravitational field strength is 10 N/kg is the same as its acceleration due to free fall (10 m/s/s. even though their units are different, they are said to be dimentionally the same. prove that N/kg is the same as m/s/s
81. ### Science

Earth's aatmosphere, oceans, and continents began to form during the first several hundred million years of..... A.Precambrian time. B.The Paleozoic era. C.The Mesozoic era. D. The Cenozoic era.
82. ### Socials

Colonies in the Wilderness 1814-1840 The Land Of Yesterday: (Im putting down paragraphs from my book to here as I want to shorten them in the end, and only gather the important key notes I need) The history of Canada has always been affected by its geography. Following war of ...
83. ### science

1) a pea plant with yellow seeds is crossed with a pea plant with green seeds. all of the offsprings have yellow seeds. the allele for yellow sees is a. Dominate because all offspring have yellow seeds. b. Recessive because all of the offsprings have yellow seeds. c. dominant ...
84. ### 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
85. ### Science

1. How did planetesmals form planets? A. They broke apart into smaller chunks. B. They collided and stuck together.<<(I think it's this answer) C. They cooled and pulled ice together. D. They began to rotate. 2. What distance was used to define the astronomical unit (AU...

I have to revise these sentences as if speaking to a 10th grade level in education. Can you tell me if these are correct: 1. We must terminate all deficit financing. Revision: We need to end all debts. 2. We must endeavor to correct this problem by expediting delivery. ...

This is the second reaction: HCl(aq)+NaOH(aq)-->NaCl(aq)+H2O(l) (Heat of neutralization) This reaction involves mixing two solutions: 1.00 mol/L NaOH and 1.00 mol/L HCl. Trial 1: 48.0 mL of the NaOH solution is mixed with 47.5 mL of the HCl. The temperature rises from 22.00...
88. ### 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
89. ### Chemistry

A student must make 500 mL of a 1.5 M HCl solution. The student has plenty of water and a stock solution of 6.0 M HCl to use. What volume of the 6.0 M HCl solution must be added to what volume of water to make the desired 500 mL of 1.5 M solution? I don't really know how to ...
90. ### calc

standard equations of circles that have centers on line 5x-2y=-21 and are tangent to both axis. Any ideas?? First express the line as in point slope form y=(5/2)x - 21/2 The center must be on the line, so it is a point expressed as (x,(5/2)x - 21/2) In order for the circle to ...
91. ### earth and space science

Materials, such as water, that becomes gaseous easily at room temperature are called volatiles. How does the complete lack of volatiles in lunar rocks support the impact theory of the moon’s formation?
92. ### science

Very hot, liquid iron and sulfur are found 1,800 miles deep in the earth in the _____.? a) inner core b) mantle c) outer core d) crust Just need to know if my answer or right or wrong. Thanks! :) c
93. ### science

Very hot, liquid iron and sulfur are found 1,800 miles deep in the earth in the _____.? a) inner core b) mantle c) outer core d) crust Just need to know if my answer or right or wrong. Thanks! :) c
94. ### 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.)
95. ### Physics

while on the moon, the Apollo astronauts enjoyed the effect of a gravity much smaller than that on earth. if Neil Armstrong jumped up on the moon with an initial speed of 1.51 m/s to a height of 0.700m, what amount of gravitational acceleration did he experience?
96. ### 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.
97. ### 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.
98. ### geometry

EARTH COMPLETES ONE FULL ROTATION EACH DAY MAKING THE SUN APPEAR TO RISE AND SET. IF THE SUN PASSES DIRECTLY OVER HEAD, BY HOW MANY DEGREES DOES ITS POSITION IN THE SKY CHANGE EVERY HOUR?
99. ### Physics

A 50-cm wire placed in an East-West direction is moved horizontally to the North with a speed of 2 m/s. The Horizontal and Vertical components of the earth's magnetic field at that location are 25 ìT and 50ìT respectively. What is the emf between the ends of the wire? A) 30...
100. ### Quick science question

In the newspaper one day, you read that the highest tides of the season are expected in the next month. What can you infer about the positions of the Sun, Earth, and the Moon? What phase of the Moon will probably be visible?