# 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.

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1. ## earth science

decribe the composition and nechanisms of the earth crust
2. ## earth

the earth has a limited amount of water true or false
3. ## geometry

what is the volume of earth if the diameter of earth is 7920 miles.
4. ## Physics

The radius of the earth is 6.4 * 10^6 m. What is the acceleration of a meteor when it is 8.4*10^6M FROM THE CENTER OF THE EARTH?
5. ## earth

Hello.. Which four gases did the earth`s atmosphere coantain in the first billion years?
6. ## earth

22. If a man weighs 720 N on Earth, what is his weight on the moon?
7. ## Earth Science

Does energy flows through the Earth's system by heat?
8. ## Earth and Space Science

which is closer to earth a moon or galaxy?
9. ## Math

Mass of earth is 5.97 x 10 kg and it's mean radius is 6.371 what's is value of g at earth surface
10. ## earth

how would global climate be affected if earth tilted on its axis
11. ## Earth Science

Why is the speed of Earth's rotation different at the equator than it is at the poles?
12. ## Earth Science

What is the atmosphere's role in the exchange of gases on Earth?
13. ## earth science

how are scientist approaching the study of Earth today?
14. ## Spanish I, John

Where on earth ARE you with your answers? Also, what is the title of the textbook you have, the copyright, the author(s) etc. Often the publishers have help online for you, if you know that information. I am very interested in your answers and/or
15. ## physics

1.In a cathode ray tube, electrons are accelerated from rest by a constant electric force of magnitude 6.56 x 10*-17 N during the first 1.87 cm of tube's length; then they move at essentially constant velocity another 45.0 cm before hitting the screen.
16. ## Physics

You walk 1300m east and then 880m south in a total time of 16min . Compute your displacement. Enter the east and south components of the displacement separated by a comma. Compute your average velocity in m/s. Enter the east and south components of the
17. ## third side

If one angle and two sides of a triangle are given, how to find the third side? This is for solving a 9th grade geometry problem of finding the distance from earth to venus You can use a standard formula for the side of the triangle that must be mentioned
18. ## Astronomy

The distance between the Earth and Mars when the two panets are at opposition varies greatly because of the large eccentricity of Mar's orbit. The perihelion distance of a planet is given by rmin=a(1-e)and the aphelion distance by rmax=a(1+e) where a is
19. ## Social Studies Helppp

In 1832, South Carolina warned the federal government not to use force to impose the tariffs of 1828 and 1832. If it did, South Carolina threatened to _____.
20. ## AP US History

When the south Carolina seceded in 1860 they seceded because Abe Lincoln was elected president. But, is the secession of South Carolina also an example of state's rights? if so, how?
21. ## physics

help pls. i need to find the best animation of the movement of electrons and protons... the best one... pls send me the link. thanks so much.
22. ## MATH

Can someone please help me with the following question. 1) The weight of an object above Earth can be modeled by a function of the form w(h)=(r/r+h)^2*"w , where r is the radius of Earth 0" (approximately 3950 miles)," h" is the distance above Earth's
23. ## Chemistry

The binding energy of electrons in a metal is 194 kJ/mol. Find the threshold frequency of the metal. ----------------- The heat of fusion of ice is 6.00 kJ/mol. Find the number of photons of wavelength = 6.78×10^−6 m that must be absorbed to melt
24. ## Physics

A canoe has a velocity of 0.490 m/s, 45 degrees southeast relative to the earth. The canoe is on a river that is flowing at 0.600 m/s east relative to the earth. Find the magnitude of the velocity vector v of the canoe relative to the river. Express your
25. ## Social Studies

1.) the first successfully established English colony in North America was a.) Plymouth b.) New York c.) Jamestown d.) Santa Fe 2.) protestants who wanted to reform the anglican church were called a.) pilgrims b.) puritans c.) plymouthians d.) priests 3.)
26. ## chemistry

How much energy is evolved when 2.65 mg of Cl(g) atoms adds electrons to give Cl1-(g) ions. No clue how to go about solving this problem as it doesn't really relate to any of my examples in my text book or notes. All I can find that related to this problem
27. ## astronomy/physic

If you’re trying to build a house north of an old pine forrest (∼50m tall trees). How far north must you be from the edge of the forrest in order to ensure that you see at least a bit of the Sun even during the winter solstice?
28. ## English

I have a few more doubts. Thank you. 1) I waited for her to prepare heself (?) How high is the fare to London? Are there any reductions for students? 2) How large is the population of Italy? To the North Italy borders to Austria, Switzerland etc (is "to
29. ## Physics 2 (URGENT)

Which of the following has an acceleration in the same direction as the object's motion? 1. Vi=3.5m/s [east]; Vf=7.5m/s [east] 2. Vi=45km/h [north]; Vf=60km/h [north] 3. Vi=15m/s [right]; Vf=10m/s [left] Textbook Ans: 1 and 2 Can someone explain why? Cause
30. ## chem!!!

what is the max number of electrons that can occupy the n=4 quantum shell? max number of electrons in shell n? 2n^2
31. ## Physics

A plane flies at 220 km/h toward the south as observed by a person on the ground. The airplane pilot measures an air velocity of 2.8 x 105 m/h south. What is the velocity of the wind that affects the plane?
32. ## geography

1. What hemisphere, the Northern or Southern, has the most land? The Northern 2. What gulf is located south of the intersection of 50 degrees E longitude and 30 degrees N latitude? The Persian Gulf 3. Which state capital is north of 40 degrees N latitude:
33. ## physics

A canoe has a velocity of 0.490 southeast relative to the earth. The canoe is on a river that is flowing at 0.520 east relative to the earth creating a 45 degree angel between the two velocities.Find the magnitude of the velocity of the canoe relative to
34. ## Pre-Calc H.W. Help :)

Can someone please help me with the following question. 1) The weight of an object above Earth can be modeled by a function of the form w(h)=(r/r+h)^2*"w , where r is the radius of Earth 0" (approximately 3950 miles)," h" is the distance above Earth's
35. ## Pre-Calculus

Can someone please help me with the following question. 1) The weight of an object above Earth can be modeled by a function of the form w(h)=(r/r+h)^2*"w , where r is the radius of Earth 0" (approximately 3950 miles)," h" is the distance above Earth's
36. ## physics

Ricardo and Jane are standing under a tree in the middle of a pasture. An argument ensues, and they walk away in different directions. Ricardo walks 24.0 in a direction 60.0 west of north. Jane walks 10.0 in a direction 30.0 south of west. They then stop
37. ## PHYSICS

Ricardo and Jane are standing under a tree in the middle of a pasture. An argument ensues, and they walk away in different directions. Ricardo walks 28.0 in a direction 60.0 west of north. Jane walks 10.0 in a direction 30.0 south of west. They then stop
38. ## physics 2014

An air-traffic controller observes two aircraft on his radar screen. The first is at altitude 750 m, horizontal distance 19.8 km, and 23.0° south of west. The second aircraft is at altitude 1300 m, horizontal distance 17.8 km, and 18.0° south of west.
39. ## Magnetic Field Forces: Physics

A uniform magnetic field points north; its magnitude is 3.5 T. A proton with kinetic energy 6.0 × 10-13 J is moving vertically downward in this field. What is the magnetic force acting on it? This is what I've done. The answer is incorrect. Please help me
40. ## statistics

Suppose that there are 10 million workers in Canada and South Korea and each worker in Canada and South Korea can produce 4 cars per year. A Canadian worker can produce 10 tonnes of grain a year, whereas a South Korean worker can produce 5 tonnes of grain
41. ## MACROECONOMICS

Suppose that there are 10 million workers in Canada and South Korea and each worker in Canada and South Korea can produce 4 cars per year. A Canadian worker can produce 10 tonnes of grain a year, whereas a South Korean worker can produce 5 tonnes of grain
42. ## geometry

Earth’s radius is about 4,000 mi. To the nearest mile, what is the distance a person can see on a clear day from an airplane 5 mi above Earth? help please!
43. ## physical science

the attraction or pull of a person"s body toward the earth by the earth is called weight.the reaction to this force is the:
44. ## phy

A spy satellite is in circular orbit around Earth. It makes one revolution in 6.01 hours. how high above earth? acceleration?
45. ## physics (gravitation)

At what height above the surface of the earth does the acceleration due to gravity reduces by 64% .radius of earth 6400 km
46. ## science

suggest only one best method to avoid such a collision if a near earth asteroid of radius 50m strikes the earth surface?
47. ## physics

What is the acceleration due to gravity 100km above the surface of the Earth? (Average radius of Earth is, Re=6.4x10^3km)
48. ## P

Calculate the magnitude of the gravitational force exerted on a 1,405-kg satellite that is a distance of two earth radii from the center of the earth.
49. ## Science

What was the particular time period when earth wasn't solid and why isn't it considered a part of Earth's geological history?
50. ## science

assuming the earth to be a sphere of uniform density,what will be the value of g in a mine 100th below the earth surface.Given r=6400 km and g=10m/s.
51. ## Earth Science

Which of the following help create volcanoes? plate tectonics landslides cracks in Earth's crust built up magma
52. ## science

imagine you are in a spaceship flying from the earth - describe what you see from the space and how you feel as it moves out of the gravitation pull of earth?
53. ## science

imagine you are in a spaceship flying from the earth - describe what you see from the space and how you feel as it moves out of the gravitation pull of earth?

Describe two complexities about Earth's climate system that results in changes happening faster than expected.
55. ## Physics

If you fell into a hole in the Earth how long would it take to reach the center of the earth if your velocity remained constant at 100mph?
56. ## Physics

If a small planet were located 7 times as far as the Earth's distance from the Sun, it period is ___ earth years?
57. ## Physics

How many times further from the Sun than the Earth is an asteroid with an average orbital period of 7.43 years? (HINT: Let the distance to the Earth be R=1 AU)
58. ## Physics

If you fell into a hole in the Earth how long would it take to reach the center of the earth if your velocity remained constant at 100mph?
59. ## physics

a bag of sugar weighs 5.00 lb on earth. What would it weigh in newton on the moon, where the free fall is one-sixth that of the earth?
60. ## Physics

A 5.0-kg rock and a 3.8 10-4-kg pebble are held near the surface of the earth. (a) Determine the magnitude of the gravitational force exerted on each by the earth.
61. ## chemisrty

Find e/m for electrons in an experiment in which H=2.68 gauss, S=5.00 cm, E=6.3x10^10 volts/cm, and 0=0.100 radian. the 0 in 0=0.100 is a zero with a line through it
62. ## english

11. Which of the following italicized words is correctly capitalized? A. Jim must drive to the North to study the northern lights. B. Mount mckinley is the tallest mountain in North America. C. The most beautiful State is Hawaii. [D. Marsha speaks
63. ## english

Which of the following italicized words is correctly capitalized? A. Mount mckinley is the tallest mountain in North America. B. The most beautiful State is Hawaii. C. Marsha speaks excellent german. D. Jim must drive to the North to study the northern
64. ## Government Check

Which is NOT true of the segregation laws passed after the Civil War? a)They prohibited interracial marriage. b)They did not only apply to blacks. *c)They were only in the South. d)All of these statements are true. I was confused between c and d because
65. ## Math

4. Columbus had a hard time convincing anyone to undertake the expense of financing a voyage to an unknown place. Based on the information available from other sailors and partly on his own ideas, Columbus underestimated the circumference of the Earth by
66. ## Astronomy

Now imagine you’re an astronomer on Earth looking at the spectrum of an object in space. In the spectrum you are looking for the so-called Lyman- alpha line of hydrogen which occurs at a wavelength of  = 122 nm. In your telescope, you observe the Lyman-
67. ## History

The questions below I am asking just to get an idea of what to write. 1. Why was the migration of the Aryans to India significant? 2. What do many of the political conflicts in South Asia have in common? 3. Why is the population of South Asia a concern for
68. ## geography

Will you please check my answers? 1. What is the capital of South Carolina, the first state to withdraw from the Union before the Civil War? Columbia, South Carolina 2. Which Scandinavian country has the highest overall elevation? Norway 3. What color is
69. ## physics

In the Earth–Moon system, there is a point where the gravitational forces balance. This point is known as the L1 point where the L stands for Lagrange, a famous French mathematician. Assume that the mass of the Moon is 1/81 that of the Earth. (a) At what
70. ## English

I included a few more sentences I'm unsure of. The last refer to the UK in the 20s. 1) I subscribe ( subscribed?) to Sky to watch English channels. I'm disgusted with this soup. 2) I was disgusted by the news (not with the news?) of the Prime Minister
71. ## Physical Science

Based on a data table of their preliminary observations, which is shown below, complete the final column entitled: “Number of Valence Electrons” and then answer the questions that follow. Element Name Symbol Group Number Alkalininium A 1 Earthium E 2
72. ## chemistry

Electrons travel in pairs. True or false? My workbook states, "Electrons like to travel in pairs so it's easy to see why covalent bonds form. It seems when an electron is unpaired it is "lonely" and can easily search for a friend. Of course, this is not a
73. ## Arithmetic

The Gardiner dam located 100 km south of Saskatoon is largest earth filled dam in the world. Upon it's opening in 1967, engineers discovered that the pressure from lake deifenbaker had moved the clay based structure 200 cm downstream. Since then, then the
74. ## physics

A Coast Guard cutter detects an unidentified ship at a distance of 18 km in the direction 16.2° east of north. The ship is traveling at 22.5 km/h on a course at 36.2° east of north. The Coast Guard wishes to send a speedboat to intercept the vessel and
75. ## Chemistry

Which of the following species is the strongest oxidizing agent under standard state conditions? a. Ag+(aq) b. H2(g) c. H+(aq) d. Cl2(g) e. Al3+(aq) An oxidizing agent is a substance that gains electrons in a redox chemical reaction. I think Al3+ has a
76. ## Biology 101

When we say an atom has an incomplete outer shell, this means the atom has ______________________ electrons in its outermost shell. Atoms that have incomplete outer shells usually seek to fill their shells by forming ____________________ ________________
77. ## Math, Geomertry

A total solar eclipse occurs when the moon passes between the earth and the sun, and the darkest shadow cast by the moon, called the umbra, hits the surface of the earth. If the umbra does not hit the surface, as shown in the following figure, then a total
78. ## physical science

state the importance of valence electrons in the organizatin of the periodic table Since this is not my area of expertise, I searched Google under the key words "'valence electrons' periodic table" to get these possible sources:
79. ## Physics

(a) Calculate the magnitude of the gravitational force exerted on a 430-kg satellite that is a distance of 2.81 times earth radii from the center of the earth. (b) What is the magnitude of the gravitational force exerted on the earth by the satellite? (c)
80. ## Physics

(a) Calculate the magnitude of the gravitational force exerted on a 488-kg satellite that is a distance of 1.95 times earth radii from the center of the earth. (b) What is the magnitude of the gravitational force exerted on the earth by the satellite? (c)
81. ## College Physics

One last physics problem left: Peggy drives from City A to City B in 50 minutes. City A is 75.1km from City O in a direction of 25degrees west of south. City B is 23.9km from City O in a direction of 20degrees south of west. Using City O as your origin,
82. ## Physics

A 6.2 kg model rocket is traveling horizontally and due south with a speed of 20.3 m/s when it explodes into two pieces. The velocity of one piece, with a mass of 1.6 kg, is v1 = (-12 m/s)i + (30 m/s)j + (15 m/s)k, with i pointing due east, j pointing due

Consider two different hydrogen atoms. The electron in each atom is in an excited state. (a) Is it possible for the electrons to have different energies but the same orbital angular momentum L, according to the Bohr model? Justify. No.Electrons within the
84. ## Physics - drwls

Posted by winterWX on Monday, March 19, 2007 at 11:51pm. A 2600 kg truck traveling north at 38 km/hr turns east and accelerates to 55 km/hr. What is the change in the truck's kinetic energy? What is the magnitude of the change in the linear momentum of the
85. ## physics

As part of an exercise program, a woman walks south at a speed of 2.00 m/s for 60.0 minutes. Then she turns around and walks north a distance 3000 m in 25.0 minutes. (a) What is the woman's average velocity during her entire motion? (b) What is the woman's
86. ## Physics

I have tried this question over and over and not sure if the answer is 16 west or 190 south west please help. Airplane One flies due east at 250 km/h relative to the ground. At the same time, Airplane Two flies 325 km/h, 35° north of east relative to the
87. ## BIOLOGY

Fermentation: (Select all that are true) Uses pyruvate to accept electrons Uses pyruvate to donate electrons Regenerates NADH Regenerates NAD+ Directly makes ATP Allows glycolysis to continue in the cytoplasm making ATP Allows oxidative phosphorylation to
88. ## Vectors-another angle confusion

On an x-y grid, label them N-S, E-W, draw a line from the origin to the right and label it 425 (you are going East) From the end of that line draw a vertical line upwards of 40 (you are going North) Use an approximate scale, realizing that 425 is just
89. ## Chemistry

how many electrons does nitrogen gain in order to achieve a noble-gas electron configuration? is it 4? Nope, it's 3. Looking across period 2, you can see that Nitrogen has 5 valence electrons. It wants 8. 8-5=3. Thanxs. How many significant figures are in
90. ## science

a commuter plane starts from an airport and takes the route whereby it starts to city,located 175km away in a directiin 30egrees north of east of east. Next, it flies for 150 km 20degrees west of north,to city b.finally, the plane flies 190kmdue west,to
91. ## Chemistry

What's the relationship between ionization energy and electron affinity? I ionization eneergy deals with losing electrons and electron affinity deals with gaining electrons, but I don't know how to explain the relationship.
92. ## math,bearing and distance

A man walks 100m due north and then 150m on a bearing of s30 degree of north.how far and on what bearing is he.from his original position?

The free-fall acceleration on Mars is 3.7 m/s2. (a) What length pendulum has a period of 4 s on the earth? cm What length pendulum would have a 4 s period on Mars? cm (b) A mass is suspended from a spring with force constant 10 N/m. Find the mass suspended
94. ## Science

Physics A scientific instrument weighing 98 pounds on the Earth is transported to another planet whose mass is 1.7 Earth masses and whose radius is 0.7 Earth radii. What does this instrument weigh on this planet? To be graded correctly, enter the new
95. ## History

Most Anti-federalists believed that farming should be the basis of the U.S. economy. What can you infer was the reason behind this belief? A.)Most Anti-federalists owned textile factories in New England and needed cotton to support their businesses.
96. ## Physics

An air-traffic controller observes two aircraft on his radar screen. The first is at altitude 750 m, horizontal distance 19.8 km, and 22.5° south of west. The second aircraft is at altitude 1000 m, horizontal distance 18.0 km, and 18.0° south of west.
97. ## physics

An air-traffic controller observes two aircraft on his radar screen. The first is at altitude 950 m, horizontal distance 19.9 km, and 23.5° south of west. The second aircraft is at altitude 1200 m, horizontal distance 17.4 km, and 22.0° south of west.
98. ## PHYSICS help!!!!!!

An air-traffic controller notices two aircraft on his radar screen. The first is at altitude 850 m, horizontal distance 19.6 km, and 27.0° south of west. The second aircraft is at altitude 1100 m, horizontal distance 17.4 km, and 18.0° south of west.
99. ## science

An air-traffic controller observes two aircraft on his radar screen. The first is at altitude 850 m, horizontal distance 20.0 km, and 24.5° south of west. The second aircraft is at altitude 1100 m, horizontal distance 18.0 km, and 16.0° south of west.
100. ## Physics

You are flying in a light airplane spotting traffic for a radio station. Your flight carries you due east above a highway. Landmarks below tell you that your speed is 46.0 m/s relative to the ground and your air speed indicator also reads 46.0m/s. However,