# 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.

100,104 results, page 70
1. ## earth

planet is in circular orbit around the Sun. Its distance from the Sun is 2.9 times the average distance of Earth from the Sun. What is the period of this planet, in Earth years?

asked by Anonymous on May 18, 2011
2. ## physics

Two satellite are monitored as they orbite the earth,satellites Y is foure times as far from the earth's centere as is satellite X. if the period of revolution of satellite X is T. What is the period of revolution of Y?

asked by debiru on November 23, 2015
3. ## math

A, B, C are three points on a horizontal plane, where A is due south of B. The bearing of C from A is 060 degrees. At B, there is a vertical mast BD. The angles of elevation of its top D from A and C are 25 degrees and 20 degrees respectively. Find the

asked by somay on January 28, 2016
4. ## college algebra

A freight rain leaves a station and travels north at a constant rate of 60 mph. One hour later a passenger train leaves the same station traveling north on a parallel track at 80 mph. How long will it take for the passenger train to draw even with the

asked by quel on September 27, 2015
5. ## Biology

These are true and false questions and I want to make sure that I got them right. 1. A water molecule is held together by two single polar covalent bonds. False 2. Because oxygen has a greater electronegativity than hydrogen, water molecules are polar with

6. ## Biology

These are true and false questions and I want to make sure that I got them right. 1. A water molecule is held together by two single polar covalent bonds. False 2. Because oxygen has a greater electronegativity than hydrogen, water molecules are polar with

7. ## physics

Mars has a radius of about 0.38 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.

asked by ang on February 1, 2016
8. ## EARTH SCIENCE

If the ages of Earth and the Moon are nearly identical, as believed, why are most of the rocks found on the Moon so much older than most of the rocks found on Earth?

asked by Anonymous on July 21, 2010
9. ## Physics

Mars has a radius of about 0.53 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.

asked by josh on February 1, 2011
10. ## Physics 1111 at UGA

If a projectile is launched from Earth with a speed equal to the escape speed, how high above the Earth's surface is it when its speed is one third the escape speed?

asked by Merritt on November 16, 2015
11. ## Algebra

The mass of Earth is about 3 × 10-3 times the mass of Jupiter. The mass of Earth is about 6 × 10 24 kg. What is the mass of Jupiter? Give your answer in scientific notation.

12. ## earth

if the radius of the earth's orbit around the sun is 93,000,000 miles, what is the speed of the earth in it's orbit in miles per hour?

asked by katy on September 10, 2011
13. ## physics

If a projectile is launched vertically from the Earth with a speed equal to the escape speed, how far from the Earth's center is it when its speed is 1/9 of the escape speed?

asked by Turk on April 28, 2012
14. ## physics

Mars has a radius of about 0.38 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.'

asked by ang on February 1, 2016
15. ## physics

If Earth's mass were suddenly and magically reduced to half its present value, the Sun's gravitational force on Earth would A. be reduced by a factor of 2. B. be reduced by a factor of 4. C. increase by a factor of 2. D. remain the same. I was told it

asked by anonymous on March 11, 2014
16. ## Physics

A spaceship lifts off from the Earth with constant acceleration. 9 seconds into the flight, a small piece of the ship breaks off and falls back to the Earth. If the piece hit the ground 11.5 seconds after breaking off from the spaceship, what is the

asked by Kayla on January 29, 2012
17. ## physics

On a safari, a team of naturalists sets out toward a research station located 5.54 km away in a direction 47.9 ° north of east. After traveling in a straight line for 1.29 km, they stop and discover that they have been traveling 24.6 ° north of east,

asked by Shant on September 6, 2014
18. ## science

Please help me with these questions I have looked all threw my book but i cant find them. 7. Why are we not sure about the interior of the earth? Do we know for sure why? 12. Some volcanoes are more explosive than others? What makes this diffrence in

asked by melody on January 19, 2008
19. ## Math

find an expression for the magnitude of the initial velocity that a projectile must possess in order to leave the earth when air friction is negelcted. The gravitational constant is given as G= 6.67428*10^-11 m^3 kg^-1 s^-2 Please give lots of details in

asked by Gerry on April 27, 2011
20. ## Maths and Physics

Law of Gravitation- Find an expression for the magnitude of the initial velocity that a projectile must possess in order to leave the earth when air friction is neglected. The gravitational constant for g is, G = 6.67428*10^-11 m^3 Kg^-1 s^-2 (10 marks).

asked by David on April 19, 2011

find an expression for the magnitude of the initial velocity that a projectile must possess in order to leave the earth when air friction is negelcted. The gravitational constant is given as G= 6.67428*10^-11 m^3 kg^-1 s^-2 Please give lots of details in

asked by Daphine on April 27, 2011
22. ## physics

Two people push on a 4 kg object. One force is 60N, north. The second force is 40N, east. Find the acceleration of the object. Ignore friction. The answer is 18m/s/s at 53.31 degrees.......but i don't know how to get to it.

asked by Wendy on September 12, 2010
23. ## math

Two ship P and Q left a port R at the same time.Q sailed on a bearing of 150 while P sailed on the north side of Q.After a distance of 8km and 10km by P and Q respectively,their dirtance part was 12km.find the bearing of P from R.

asked by amarachi on March 2, 2015
24. ## Physics

An airplane traveling at 200 mph in a direction of 40 degrees north of east encounters a wind blowing east at 50.0 mph. Find the velocity of the plane measured from the ground.

asked by Al on September 26, 2017
25. ## math

Two ship P and Q left a port R at the same time.Q sailed on a bearing of 150 while P sailed on the north side of Q.After a distance of 8km and 10km by P and Q respectively,their dirtance part was 12km.find the bearing of P from R.

asked by kate on May 28, 2017
26. ## Algebra II

Forces of 675 lb and 828 ob act on a body. The smaller force acts due north; the larger force acts N 52.3 degrees E. Find the direction and the magnitude of the resultant.

asked by Arielle on November 2, 2011
27. ## 8th Grade Social Studies Unit test

What is all the answers? please help 1. What significant affect did the Treaty of pairs, signed after the french and Indian War, have on France? a.France had to Withdraw to its empire in central and South America. b.France had to allow the British to claim

asked by mo on November 11, 2016
28. ## 1 question LA AM I RIGHT?

"The River" 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 perfect

asked by Linda on April 7, 2015
29. ## history

1. The Filipino insurrection led by the Aquinaldo was the result of a. the senate vote ratyfing the treaty of paris ending the spanish american war b. the extension of american military occupation of manila to the entire archipelago 2. The american

asked by phil on January 19, 2009
30. ## Art

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 enogh for my every thought, 7. The perfect place

asked by #FreeGucci on March 7, 2016
31. ## physics

A kayaker paddles at 4.0 m/s in a direction 30° south of west. He then turns and paddles at 3.7 m/s in a direction 20° west of south. I know the formulas but having trouble figuring out the degree of angle. Ax=4(cos30)= 3.4641 Ay=4(sin30)= 2

asked by Lou on October 5, 2015
32. ## Physics

The space shuttle typically orbits 400 km above the earth's surface. The earth has a mass of 5.98 × 1024 kg and a radius of 6,380 km. A) How much would a 2000 kg part for the space station weigh when it has been lifted to that orbit in the shuttle's cargo

asked by Space Shuttle-Q1 on May 13, 2014
33. ## physics

. The space shuttle typically orbits 400 km above the earth's surface. The earth has a mass of 5.98 × 1024 kg and a radius of 6,380 km. A) How much would a 2000 kg part for the space station weigh when it has been lifted to that orbit in the shuttle's

asked by Chelsey Achord on December 3, 2012
34. ## history

To find new territory for a growing population, the Song rulers A. purchased lands from neighboring peoples. B. colonized underpopulated areas to the southwest. C. sent people to unpopulated regions to the north. D. conquered territories by military force

asked by bob on May 30, 2011
35. ## Soc. Studies-Ms. Sue

What was the first territory to shed blood in a civil war over slavery? A.Texas B.Kansas C.Missouri D.South Carolina I know there was blood shed in Kansas-but there is info that South Carolina was the first territory that had blood shed??? Can you help me?

asked by Cassie on March 26, 2013
36. ## U.S. History

What challenges did the Radical Republicans face during the Reconstruction period? The Radical Republicans fought for political supremacy. They had two main goals: Break the power of wealthy planters who had long ruled the South. Ensure that freedman

asked by B.B. on December 7, 2009
37. ## physics

A Hall-effect probe operates with a 120 -mA current. When the probe is placed in a uniform magnetic field of magnitude 0.0840 T, it produces a Hall voltage of 0.660 µV. The thickness of the probe in the direction of B is 2.00 mm. Find the density of the

asked by Rachel on April 8, 2011
38. ## physics

A Hall-effect probe operates with a 120 -mA current. When the probe is placed in a uniform magnetic field of magnitude 0.0840 T, it produces a Hall voltage of 0.660 µV. The thickness of the probe in the direction of B is 2.00 mm. Find the density of the

asked by Rachel on April 8, 2011
39. ## Chemistry

I am trying to complete one of those charts, where you find an element, its proton number, its electron number, it's charge, and whether it's an ion or an atom, based on looking at the Periodic Table. I get how it works, sort of, like for Lithium, you look

asked by Corinne on February 23, 2009
40. ## physics

student wanted to drive from Austin to San Antonio, 80 miles south of Austin on highway I35. Unfortunately, he entered the highway in the wrong direction and drove all the way to Waco — 100 miles north of Austin — before he noticed his error. In Waco,

asked by Payton on September 25, 2013
41. ## Science

7. Which degree of tilt produced light similar to what North America experiences in summer? Explain your answer *Based on the four seasons portfolio I need help with this bevause I dont understand what it is asking. Is it asking for the areas or the

asked by oof on January 19, 2018
42. ## PHYSICS

This is the same question as last time. "A plane is flying 25 degrees north of west at 190 km/h and encounters a wind from 15 degrees north of east at 45 km/h. What is the planes new velocity with respect to the ground in standard position?" Elena kindly

asked by Matt, AGAIN on February 18, 2013
43. ## Physics

A 79.0-kg fullback running east with a speed of 4.00 m/s is tackled by a 93.0-kg opponent running north with a speed of 3.00 m/s. (a) Why does the tackle constitute a perfectly inelastic collision? (b) Calculate the velocity of the players immediately

asked by Allie on October 4, 2011
44. ## English

I need to find 4 rhetorical devices and I am having trouble! Pearson’s address on the inauguration of the national flag of Canada: On September 5, 1945 an Order-in-Council was passed declaring the Red Ensign to be Canada's National Flag pending a

asked by Jessica A on March 6, 2011
45. ## math

Below are the median prices of homes sold in 2009, by region of the country. South 158,300 Northeast 248,800 Midwest 139,500 West 243,200 U.S. 180,100 The median selling price of a home in the South was approximately what fraction of the median selling

asked by Christina on October 31, 2012
46. ## trig

An airplane has an airspeed of 450 km/hr bearing N45E. The wind velocity is 30 km/hr in the direction N30W. What is the ground speed and what is its direction?. I have gotten this far: A= 450cos(45), 450sin(45) = (318.20, 318.20) W= 30cos(120), 30sin(120)

asked by VEJ on July 13, 2011
47. ## History

3.)Which answer best explains the effect of the invention of the cotton gin on slave labor in the South? A.)The cotton gin made it possible to plant cotton in even the hardest soil. Because of this, cotton could be grown everywhere, & the labor increased

asked by #FreeGucci on May 4, 2016
48. ## Physics

A spy satellite is in circular orbit around Earth. It makes one revolution in 6.00 hours. (a) How high above Earth's surface is the satellite? [Answer in Km] (b) What is the satellite's acceleration? [Answer in m/s^2] Please provide a step by step

asked by MB on February 22, 2011
49. ## Math

The scale for an earth model is 1:40000000. The diameter of the earth is 12,756.32km. a)What is the diameter of the model in cm? b) If the model is cut in half, how many jars of paint would be needed to paint each half if 1 jar covered 10cm^2?

asked by Anonymous on October 22, 2014
50. ## English

Crossing the Sea A verdant rain forest rises out of the ocean to snow-capped peaks. Powerful fiords snake their way into glacial valleys. Rivers roar and meadows blossom. Many consider the land of New Zealand to be among the most beautiful places on Earth

asked by Kaai97 on January 29, 2016
51. ## English

Crossing the Sea A verdant rain forest rises out of the ocean to snow-capped peaks. Powerful fiords snake their way into glacial valleys. Rivers roar and meadows blossom. Many consider the land of New Zealand to be among the most beautiful places on Earth

asked by Kaai97 on January 28, 2016
52. ## statistic

According to a June 2009 report, 68% of people with “green” jobs in North America felt that they had job security, whereas 60% of people with green jobs in the United Kingdom felt that they had job security. Suppose that these results were based on

asked by ayno on May 1, 2017
53. ## Math

A nuclear submarine leaves its base and travels at 23.5 mph. For 2.00 hrs it travels along a course 32.1 degrees north of west. It then turns an additional 21.5 degrees north of west and travels for another 1.00 hrs. How far from its base is it?

asked by Julian on November 4, 2013
54. ## Math

The position of two towns X and Y are given to the nearest degree as X(45° N, 10° W) and Y (45 N°, 70° W). Find 70-10 =60 Find: (a) The distance between the two towns in (i) Kilometers ( take the radius of the earth as 6370) 60/360

asked by Kid on April 15, 2018
55. ## Macroeconomics

Has anyone ever done a project on Macroeconomics in the Middle Earth? (based on Lord of the Rings?) I need help NOW! What a wonderful idea!! I presume you have read LOTR. You could do the whole middle earth or just a just an area such as the Shire or

asked by Erin on May 16, 2007
56. ## physics

The sun’s mass is about 2.7 x 107 times greater than the moon’s mass. The sun is about 400 times farther from Earth than the moon. How does the gravitational force exerted on Earth by the sun compare with the gravitational force exerted on Earth by the

asked by Ciara on April 6, 2015
57. ## Algebra

The Hansons are considering two possible vacation destinations. A trip out west will cost \$1075 in total airfare plus an average of %450 per day in expenses. A trip south will cost \$1500 in total airefare plus an average of \$365 per day in expenses. How

asked by Janet on February 16, 2012
58. ## Science ENGR

Consider a laser which emits photons with a wavelength of 1.55 micrometers. The laser has a lower electron level Ei and an upper electron level Eu. A power supply pours electrons into the upper energy level and these electrons fall down in a time T= 0.1

asked by Pam on November 19, 2006
59. ## Advanced Placement World History

i need to answer these essays any information will be helpful!!! Change Over Time choose TWO areas listed below and analyze how each area's relationship to global trade patterns changed from 1740 to 1914. Be sure to describe each areas involvement in

asked by Morgan on May 22, 2007
60. ## physics

A railroad car containing explosive material is initially traveling south at a speed of 4.5 m/s on level ground. The total mass of the car plus explosives is 2.9 104 kg. An accidental spark ignites the explosive, and the car breaks into two pieces, which

asked by glenmore on December 5, 2011
61. ## Physics - Gravitational force

Find the gravitational force between earth and the sun. I am using the formula Fg = (G*m1*m2)/(r^2) where G = 6.67*10^-11 m1 = 6.0*10^24kg m2 = 2.0*10^30kg r = should i use the sun's radius or the earths (Rearth = 6.38*10^6; Rsun = 6.96*10^8) either way i

asked by Shaila on August 21, 2010
62. ## Math

A40m deep wellwith radius 3.5m is dug and the earth taken out is evenly spread to form a plat form ofdimensions 28mby 22m. find the height of the platform.

asked by Hiwot on May 7, 2016
63. ## physics

Two pellets, each with a charge of 0.80 microcoulomb (8.0×10−7 C), are located 4.0 cm (4.0×10−2 m) apart. Find the electric force between them, which I solved for 3.6 N. I am stuck on the next part: What would be the mass of an object that would

asked by Christy on April 17, 2012
64. ## Social Studies

I have to write a poem about life in Carribien South America today. But the problem is I can't find any good sources and credible sources, and even if I did have some I don't know how to start writing a poem. Could you give me some sources for it, and an

asked by Joey on May 10, 2018

I have a question about the International Space Station-Its been orbiting earth at 350km-If the radius of the earth is 6,370 km, what is the period of orbit for the Space Station? Secondly, if it was moved to a geosynchronous orbit, what would the new

asked by Julie on December 2, 2010
66. ## physics

The eye of a hurricane passes over Grand Bahama Island. It is moving in a direction θ = 49° north of west with speed v1 = 41.0 km/h. Exactly three hours later, the course of the hurricane shifts due north, and its speed slows to v2 = 19.5 km/h, as shown

asked by Trisha on December 22, 2009
67. ## physics

The eye of a hurricane passes over Grand Bahama Island. It is moving in a direction θ = 50° north of west with speed v1 = 34.5 km/h. Exactly three hours later, the course of the hurricane shifts due north, and its speed slows to v2 = 16.1 km/h, as shown

asked by Anonymous on September 25, 2013
68. ## physics

The eye of a hurricane passes over Grand Bahama Island. It is moving in a direction θ = 50° north of west with speed v1 = 34.5 km/h. Exactly three hours later, the course of the hurricane shifts due north, and its speed slows to v2 = 16.1 km/h, as shown

asked by Anonymous on September 25, 2013
69. ## AP Physics B

A 2189 kg car moving east at 9.73 m/s collides with a 3285 kg car moving north. The cars stick together and move as a unit after the collision, at an angle of 35.7◦ north of east and at a speed of 4.79 m/s. What was the speed of the 3285 kg car before

asked by Daisy on November 1, 2012
70. ## physics

The eye of a hurricane passes over Grand Bahama Island. It is moving in a direction θ = 50° north of west with speed v1 = 34.5 km/h. Exactly three hours later, the course of the hurricane shifts due north, and its speed slows to v2 = 16.1 km/h, as shown

asked by Anonymous on September 25, 2013
71. ## physics

The eye of a hurricane passes over Grand Bahama Island. It is moving in a direction θ = 50° north of west with speed v1 = 34.5 km/h. Exactly three hours later, the course of the hurricane shifts due north, and its speed slows to v2 = 16.1 km/h, as shown

asked by Anonymous on September 25, 2013
72. ## History

1. In declaring its intention to secede frmo the Union in 1860, South Caroling was affirming its position on A.Civil Rights B.States rights C.Individual rights D.Human Rights B? 2.Which event was the immediate cause of the seccession of several South

asked by M on March 26, 2015
73. ## physics

Two beetles run across flat sand, starting at the same point. Beetle 1 runs 0.42 m due east, then 0.72 m at 32o north of due east. Beetle 2 also makes two runs; the first is 1.48 m at 47o east of due north. What must be the magnitude of its second run if

asked by Anna on September 25, 2012
74. ## Chemistry

how many outer shell electrons does a carbon atom have using periodic table?

asked by Timofey on May 18, 2013
75. ## Physics

In the photoelectric effect, what determines the kinetic energy of the ejected electrons?

asked by Rob on April 4, 2008
76. ## Chemistry

In which of the following substances does sharing of electrons between two atoms occur? He Nal PO43– Ag

asked by Sara on December 2, 2015
77. ## chemistry

an atom of cesium cs has 55 protons 55 electrons and 77 neutrons true false

asked by kaiya on October 11, 2010
78. ## chemistry

Compare the three types of bonds based on what happens to the valence electrons of the atoms

asked by chris on September 16, 2010
79. ## science

please draw an atomic diagram showing electrons in different energy levels LI + N = MG + F = NA + F = AL + O = LI + O = K + S = MG + O =

asked by kingsley on January 17, 2015
80. ## Physics

Would electrons be ejected from aluminum if the incident violet light has a wavelength of 4.00 x 10-7 m?

asked by Jackson on April 25, 2017
81. ## chemistry

What mass of electrons would be required to just neutralize the charge of 1.0 grams of protons?

asked by ETaylor on January 28, 2011
82. ## Ivy Tech

The source of magnetism is A)polarization B)magnetic monopoles C)electrons D)protons

asked by Kim Love on March 27, 2010
83. ## chemistry

What is the charge carried by electrons as 0.120 mole of Cr(s) is oxidized to Cr3+(aq)?

asked by Anonymous on April 18, 2013
84. ## Chemistry

If your body develops a charge of -18 (microcoulombs), how many excess electrons has it acquired?

asked by Anonymous on September 18, 2012
85. ## CHEM

Arrange the elements in decreasing order of the number of valence electrons Br,S,Sb,Sr,F,Mg,I,Ca,Na,Kr,Xe,Bi,Ge,Ga,K

asked by M on September 5, 2014
86. ## Science

Consider a neutral atom that has 17 electrons A.) how many protons does it have? B.) what is it's atomic number? C.) which element is it?

asked by Tessa on February 18, 2014
87. ## chem.

How many electrons can an orbital hold? I know the answer is 2, but how do you get there? And how do you figure out how many 2p orbitals there are in an atom?

asked by CONFUSED on October 2, 2008
88. ## chemistry

how do i do this: give the number of protons, electrons, and neutrons in each of the following atoms. 108 47 Au 40 20 Ca 23 11 Na

asked by monique n on December 2, 2010
89. ## Physical Science

Explain why a neutral atom cannot haveone proton, one neutron and two electrons?

asked by Kay on March 12, 2008
90. ## AP Chemistry

NF2- has (2, 3, 4) regions of high electron density and (2, 4, 6) bonded electrons.

asked by Anonymous on April 3, 2011
91. ## chemistry

hund's rule tells us that element 116 will have what paired electrons?

asked by barbara on February 18, 2010
92. ## Science

If neons atomic number is 10 how many electrons are in the outer energy level?

asked by Melissa on June 10, 2010
93. ## Biology

how does the number of electrons in an atom determine what kind of bond it can form?

asked by dylan on September 11, 2015
94. ## chemistry

What is the velocity, in meters per second, of a beam of electrons if they are to display a "de Broglie" wavelength of 41.2 um?

asked by abby on March 13, 2014
95. ## Chemistry

What mass of electrons would be required to just neutralize the charge of 3.9 grams of protons?

asked by Alyssa on October 14, 2010
96. ## Chemistry

How can you tell if [ MnCl6]4- or [ Mn(CN)6 ] 4- has the longer wavelength of light? and then how do you figure out how many unpaired electrons each has?

asked by Trixie on April 9, 2010
97. ## chemistry

What number of electrons fit into energy levels higher than the third level?

98. ## pccs

how do protons, electrons, and neutrons difer in mass, change, and location?

asked by carlos on October 8, 2010
99. ## chemistry

what is the minimum number of electrons that would be expected to be in the valence shell of As in AsCl

asked by kabelo on September 20, 2010
100. ## IPC

The type of bond formed by shared electrons is ____. covaletn, right?

asked by Jon on October 26, 2010