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.

99,694 results, page 89
1. geography

How many countries are on the continent of South America? My answer is 12 BUT my classmate said it is thirteen. I am pretty sure I am the one that is right. Can you help?

asked by Reed on February 6, 2011
2. SS

After the Civil War, many settlers who migrated likely went? 1) to Canada 2) to the South 3) to the West 4) to Maine

3. physics

A car travels due east with a speed of 35.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 70.0° with the vertical. Find the velocity of the rain

asked by kia on February 17, 2011
4. physics

A car travels due east with a speed of 35.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 70.0° with the vertical. Find the velocity of the rain

asked by Anonymous on February 18, 2011
5. central america & the caribbean

word bank : belize,costa rica ,coffee, cuba,honduras,lead,mestizos,multicultural,oil,panama canal,puerto rico,rice,sugar cane, slavery,canal 2.___was introduced in the caribbean after indians died from european diseases. 3.central america is an ___between

asked by Jason on December 2, 2008
6. English III

The War of the Worlds by H. G. Wells [1898] But who shall dwell in these worlds if they be inhabited? Are we or they Lords of the World? And how are all things made for man?- KEPLER (quoted in The Anatomy of Melancholy) BOOK ONE: THE COMING OF THE MARTIANS

asked by Halo4Records on May 27, 2014
7. check geo

russian coasts lie along the pacific and artic oceans, as well as the: A)caspian sea, black sea, and baltic sea. B)atlantic ocean,black sea,and baltic sea. c)capian sea,north sea,and black sea D)North sea,black sea,and baltic sea. .The answer is A. The

asked by henry on September 3, 2009
8. history help

1. Which factor contributed the most to the increased importance of literature in American culture during the 19th century? A. the success of major social reform movements B. the spread of utopian communities throughout the nation C. the migration of

asked by summer moriarty on April 28, 2016
9. history

1. Which factor contributed the most to the increased importance of literature in American culture during the 19th century? A. the success of major social reform movements B. the spread of utopian communities throughout the nation C. the migration of

asked by catwoman on April 29, 2016
10. history help

1. Which factor contributed the most to the increased importance of literature in American culture during the 19th century? A. the success of major social reform movements B. the spread of utopian communities throughout the nation C. the migration of

asked by summer moriarty on April 28, 2016
11. Science

Which of the following is NOT a common landform caused by the passing of a glacier? Drumlins Esker Moraine Steppe ******************** There are sometimes flowing rivers within a glacier. True *************************** False Glaciers form and grow when

asked by Cassie on March 12, 2014
12. dynamics

(a) A rocket is travelling out of the earth’s atmosphere. During flight it burns fuel at a rate of 80kg/s producing a constant thrust of 500kN which drives the rocket in a vertical trajectory. It has a mass of 3500Kg when it reaches a speed of 1220m/s.

asked by kevin on December 29, 2015
13. social studies

Study the image. An image of American Indians, Spanish priests, and Spanish settlers is shown. The Spanish priests are in the middle of the picture with a church in the background. American Indians are kneeling in prayer to the left of the priests. Spanish

asked by benny on September 24, 2018
14. physics

a coast guard ship is traveling at a constant velocity of 4.20m/s, due east, relative to the water. on his radar screen the navigator detects an object that is moving at a constant velocity. the object is located at a distance of 2310m with respect to the

asked by ajo on November 17, 2007
15. Science :))

Earth's inner core is responsible for Earth's ... Magnetic field *** Ocean currents Volcanic activity Tectonic plate movement _____ make up ______ which make up ______. Organs, tissues, cells Cells, organs, tissues Tissues, cells, organs Cells, tissues,

asked by Anonymous on December 19, 2017
16. Science

Which best describes the similarities among elements included in the same column of the periodic table? A. They have the same state at room temperature. B. They have the same number of protons. C. They have the same number of electrons. D. They have

asked by Anonymous on March 13, 2014
17. science

in an atom electrons move in definite orbits around the nucleus much like planets cirlce the sun. who said this - I think Bohr choices are: Bohr rutherford wave model Thompson democritius

asked by sam on November 3, 2007
18. Chemistry

How much energy in KJ is release to form one mole of 123Sb from protons and neutrons if the atom has a mass of 122.90422 amu? Please remember to include the mass of electrons in calculations.

asked by Jay on May 6, 2011
19. chemistry

the reaction of aluminum metal (Al) with oxygen (O2) forms Al2O3. What is a balanced equation for this redox reaction. What are two half reactions to show how many electrons are gained or lost by each species?

asked by cathy on April 11, 2010
20. physics

If a metal wire carries a current of 130 mA, how long does it take for 3.50×10 20 electrons to pass a given cross-sectional area anywhere along the wire? The magnitude of the charge on an electron is 1.6 × 10 −19 C. Answer in units of s.

asked by bre on February 23, 2011
21. physics

1) When electrons are forced away from a/an ___ plate, work is done. Is "positive" a possible answer? 2) Any pointed or angular surface of an object must have a/an ___ concentration of charge to establish equilibrium. Any ideas?

22. de Broglie Wavelength

The presence of oxygen atoms on the surface results in auger electrons with a kinetic energy of approximately 505 eV. What is the de Broglie wavelength of this electron? [KE= (1/2)mv^2; 1 electron volt (eV) = 1.602*10^-19 J]

asked by Kyle on November 13, 2009
23. physics

Four identical metallic objects carry the following charges: +4.2 µC, +5.4 µC, -2.2 µC, and -4.4 µC. The objects are brought simultaneously into contact, so that each touches the others. Then they are separated. How many electrons (or protons) make up

asked by kary on September 3, 2009
24. Chem

Specify the number of unpaired electrons for each of the species shown below. CuCl2- (linear) Ni(NH36) 2+ NiCl4 2- (tetrahedral) CoF6 3- (weak field) Co(en)3 3+ (strong field) (en = "ethylene diamine") Would it be: 1 2 2 3 3 ??

asked by Ginger on April 19, 2008
25. Social studies

Why did the Republicans in Congress feel of the 14th amendment was necessary? A- they worried the healthy Southern planters would not comply with the civil rights act B- they were that president Johnson would not enforce the civil rights act C- they

asked by Flany on December 31, 2016

this is the last time ill post for these 2 questions ill be moving on to the next social studies after this check 3.D 5.C 3.Which statement best describes the economics of Caribbean South America? A. Venezuela benefits from oil resources while other

asked by matt on April 16, 2014
27. 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? (Note: this question refers to Newton’s equation for

asked by ThuyD on January 22, 2012
28. Physics

You have been sent in a small spacecraft to rendezvous with a space station that is in a low circular Earth orbit, say, with a radius of 6,720 km, approximately that of the orbit of the International Space Station. Due to mishandling of units by a

asked by Catherine on May 7, 2011
29. Chemistry

(a) Cadmium telluride (CdTe) is a semiconductor witha band gap, Eg, of 1.45 eV. Calculate the value of the absorption edge of this material. Express your answer in meters. (b) Shown below are several % absorption vs. wavelength diagrams. Identify the

asked by Odesa on December 14, 2012
30. physics

A communications satellite is in a synchronous orbit that is 3.00 107 m directly above the equator. The satellite is located midway between Quito, Equador, and Belem, Brazil; two cities almost on the equator that are separated by a distance of 3.10 106 m.

asked by Anonymous on February 22, 2011
31. Physics Energy and Work Done

A 390-N child is in a swing that is attached to a pair of ropes 1.9 m long. Find the gravitational potential energy (in JOULES) of the child–Earth system relative to the child's lowest position at the following times. A) when the ropes are horizontal B)

asked by Mofied on November 1, 2011
32. math

5. Dan’s house is north 3 miles and west 3 miles from Amy’s house. Find the distance between Amy’s house (6, –3) and Dan’s house (3, 0). (Estimate to two decimal places.)

asked by noy on January 24, 2013
33. Chemistry II

For the cell Fe(s)©¦Fe2+(aq)¨UO2(g)©¦H+(aq), H2O(l)©¦Pt(s) Indicate a) standard cell potential; b) overall cell reaction c) number of electrons transferred

asked by Rebecca on May 3, 2011
34. physicalscience

1. which one of the 4 keeps electrons in orbit around the nucleus? electromagnetic force weak force strong force gravity 2. which is the greatest of the 4 fources

asked by liz on November 3, 2007
35. physical sciences

When a covalent bond forms between two atoms how many atoms have a full outer shell of electrons? A. one B. two C. zero D. It depends on what the atoms are. HELP PLEASEE

asked by lalt on May 26, 2012
36. Chemistry

Are binary compounds ionic or covalent? If they are covalent? If they are covalent, I thought they don't form bonds that way, since they share electrons.

asked by Emily on March 15, 2011
37. Chemistry Honors

Which of the following subatomic particles have a mass of approximately 1 amu? I. protons II. neutrons III. electrons A. I and III only B. I, II, and III C. I only D. I and II only Answer: D

asked by Amber M. on June 2, 2018
38. Physics

a system of 1525 particles, each of which is either an electron or proton, has a net charge of -5.456*10^-17 C. A) How many electrons are in this system? B) What is the mass of this system?

asked by Anonymous on January 10, 2011
39. chemistry

the mass of helium 4 atom is 6.64648 x 10^24 g and each of its two electrons has the mass 9.10939 x 10^-25 what fraction of the atoms mass is contributed by its nucleus?

asked by jay on October 15, 2015
40. Math

A woman drove her car on a road running due north at a given rate for 6 hours. She continued her trip on an unsaved road due east for 5 hours at a rate of 4mph slower. Had she been able to go to her destination in a straight line from her starting point

asked by Joey on February 2, 2017
41. physics vectors w/angles

A little girl is riding a sled horizontally in the snow, the combined mass of the girl and sled is 33.4 kg. She is being pulled by her parents. Mom is pulling her with a force of 5.18 N, at an angle of 20.0 degree E of N. Dad is pulling her with a force of

asked by stacy on November 28, 2009
42. Chemistry

Given cell Cd | CdCl2 (0.55M) || NaBrO3 (0.34M), NaBr (0.12M), pH=1.20 | Pt 1. How many electrons are transferred? 2. What is E° for the cell? 3. What is E for the cell?

asked by Kelly on December 2, 2014
43. chemistry

the model of the atom that pictured the atom with electrons struck randomly throughtout the mass of the atom was called the

asked by 000 on October 27, 2010
44. Chemistry

which atom has the least attraction for the electrons in a bond between that atom and an atom of hydrogen? (1) carbon (2)nitrogen (3)oxygen (4) fluorine

asked by Anonymous on December 2, 2010
45. Science summer activity help

I saw a site that had fun summer activites and my mom said each one I pass I get 5 dollars so I want to check my answers. 1.B 3.D 4.A 5.D 1.how do scientists explain the great diversity of life on earth? different characteristics help __ A. young organisms

asked by Matt on July 28, 2014
46. Physics

The sun has a mass of 1.99x10 30 kg the earth has a mass of 5.98x10 24 kg and is 1.496x10 11 m from the sun a) Calculate the force of gravity acting on the eaarth by the sun b) CAlculate the force of gravity acting on the sun by the earth

asked by Isis on January 9, 2013
47. Help- English

The poem 1. I sit on the bank in my special place, 2. Feel the breeze that lifts my hair, 3. And watch the ripples run across the river. 4. It is so peaceful here. 5. Deep enough to justify a fishing pole, 6. Quiet enough for my every thought, 7. The

asked by BUBBLES on March 18, 2015
48. Primates

Where can I find information regarding when different types of primates showed up in earth's history?

asked by tricia on April 20, 2007
49. Science/Language

Alright.... i asked this question last night, but i'm going to be a bit more clear this time. My Language teacher is doing a big unit on "stuff",(What happens to all of the stuff on earth). My job in this project is to find the extraction of a crayon. So

asked by Dawn on March 25, 2008
50. physics

i don't understand the projectile motion...my teacher said...it's a motion of a body confined to a vertical plane, perpendicular to Earth's surface... I don't get it, can anyone explain to me clearly???? plzzzzz....THX!!!! If your teacher said that, she

asked by Katrina on November 30, 2006
51. Biology

Compared to atoms of the same element, isotopes have different A. numbers of neutrons. B. numbers of protons. (C. types of subatomic particles.) D. numbers of electrons.

asked by Garrett on April 18, 2016
52. us history

1. Using what you have learned about President George Washington, which of these government characteristics would George Washington support? Absolute power of the president Alliances with other nations Strong central government *** Powerful political

asked by Labbayk on January 13, 2016
53. Social Studies

1.What was the purpose of the Treaty of Tordesillas? A.to end a war between Spain and Portugal B.to give Portugal control over the Spice Islands C.to divide the non-European world between Spain and Portugal ******* D.to create a trade agreement between

asked by plz check these!! Thanks on October 11, 2018
54. College Algebra

The parking lot is 25 by 40 feet. The owner wants to enlage the parking lot by paving an equal width strip on the north side and east side of the lot, sot hat the new lot will be twice the area of the old one. Find the equation which has as a root the

asked by Jorge on May 3, 2012
55. geography

1. The mouth of the Parana River is located in Argentina. In what country can its source be found? Brazil 2. In what ocean do 20 degrees S latitude and 80 degrees E longitude intersect? The Indian Ocean 3. Land formed by soil deposited at the mouth of a

asked by Reed on January 21, 2012
56. Physics

A 33.4 kg child, with a 3.05 kg backpack on his back, first stands on a sidewalk and then jumps up into the air. Find the force (positive up/negative down) on the sidewalk from the child when the child is (a) standing still and (b) in the air. Now find the

asked by John on January 21, 2014
57. physics

A 29 kg child, with a 4.5 kg backpack on his back, first stands on a sidewalk and then jumps up into the air. Find the magnitude and direction of the force on the sidewalk from the child when the child is (a) standing still and (b) in the air. Now find the

asked by ayla on October 4, 2011
58. social studies

why did a land bridge emerge between asia and north america

asked by lee on October 29, 2014
59. science

If a ball rolls North 5 meters in 2 seconds, what is its speed?

asked by Gwinn on October 5, 2011
60. gyro

a gyro always points to a certain direction, but how is it made to point only towards north?

asked by mp on February 17, 2010
61. health

Why is heart disease the number one killer in north america

asked by Anonymous on February 22, 2015
62. geography

Is this correct? Mexico city is north of the tropic of capricorn?

asked by sean on September 14, 2011
63. Social studies

Why did Spain not colonize in some significant areas of north america??

asked by Unknown on August 24, 2013
64. college

What are somenotable similarities between Australian and North American cities?

asked by Betty on April 17, 2010
65. science

A boy moves 100m towards North then 70 my towards East then what is its displacement

asked by kamran on March 3, 2018
66. biology

Whats the width of the north american tectonic plate?

asked by lizzie on September 14, 2007
67. Geography

What is the name of the island in North America that is part of Denmark. Greenland

asked by cindy on March 12, 2007

How did france establsi hterritoral claims in north america?

asked by Debra on October 11, 2008
69. World Atlas

What website can I use to get all the information I need about a specific State (North America)?

asked by John on November 3, 2009
70. History

Which religion was prominent to much of North Africa in the early 1800s?

asked by Dan on October 12, 2017

How did spain establish territorial claims in north america?

asked by Debra on October 11, 2008
72. social studies

What strange tade took place in North and West Africa?

asked by miley on January 28, 2010
73. AP style

Does anyone know if north central is hyphenated AP style? my book doesn't really specify.

asked by blaze on February 24, 2014
74. History

How did geography of North America help or hinder our nation's development?

asked by Maria on September 9, 2012
75. History

What is the North American Bourgeoisie belief between 1763 and 1783?

asked by Nataly on November 14, 2012
76. world history

Which of the following nations possess nuclear weapons? I say North Korea

asked by tracy on January 23, 2012
77. social studies

What year did the Vikings explore the North American coastlines?

asked by dyshonn on May 13, 2011
78. Social Studies

Why Did European explorers claim land in North America?

asked by Ryan on February 8, 2009
79. Physics

A boy walk 1km due north.what is his displacement?

asked by Okereke on November 11, 2011
80. History

asked by Anonymous on December 9, 2015
81. SOCIAL STUDIES

How did the Columbian Exchange affect the north america and EUROUPE ?

asked by 45SEC on September 15, 2015
82. world geography

Which of the following statements about the physical geography of North America is true?

asked by Anonymous on December 23, 2011
83. religion

Will you explain the theory of how the early people came to North America?

asked by JRPP3 on October 11, 2010
84. Science

why have the jet streams moved north because of global warming?

asked by Anonymous on December 11, 2012
85. social studies

what challenges did english settlers in north america face?

asked by jordan on December 1, 2008
86. religion

what role does religion play in society in North Korea?

asked by Derek on May 16, 2010
87. AP physics

A car travels 35 km west and 75 km north. what distance did it travel?

asked by LISAA on August 2, 2010
88. History

which british north american colonies joined confederation

89. Maths

Points x and y are respectively 12m north and 5m east of point z.calculate xy

asked by Gerhard on September 5, 2016
90. social studies

1. What was the first PERMANENT European colony in North America? hope someone can help!!

asked by JJ on October 28, 2010
91. physics

a man goes 10m towards north,then 20m towards east then displacement is what

asked by sajid on June 15, 2015
92. social studies

When did countries in north africa start to gain independence?

asked by abigail on November 16, 2015
93. Social Studies

What is located on 80 north latitude and 140 west longitude?

asked by Derrick on September 10, 2012
94. Physics 30

Vectors A) 3.5 cm North B) 4.2 cm West Algebraically subtract B from A(B-A) Whaaaa? Please help

asked by Don on February 22, 2012
95. geography

how does the north korea affect in their geography ?? plss. I need the answer ..

asked by elaine faith on June 26, 2010
96. geography

Under Communist leadership, North Korea has continued to evolve

asked by Liberty on May 13, 2013
97. world history

What are some changes and continuities in the demography of North America from 600-1750?

asked by Anonymous on February 17, 2013
98. Social Studies Question

does north america have acess to local and global markets

asked by matt on April 10, 2014
99. physics

At 300 K we see the electron concentration in the conduction band for pure (undoped) Si is 10^10/cm3. How many electrons per Si atom is this? You can use scientific notation, as in A.AAeB Si is diamond cubic with 8 Si atoms per unit cell and a lattice

asked by Henry III on December 21, 2013
100. Anatomy

1)Which two molecules/chemicals make up the backbone of the DNA molecule? 2)Which organelle makes most ATP? 3)AMP would have ________ phosphate(s) attached to it? 4)Which is the smallest carbohydrate 5)Which type of chemical bond involves a sharing of

asked by Stephanie on October 16, 2008