# 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 57

Where can I find info on doing business in south america. I have to write a paper on what coutry is best to do business in Cuba, Brazil, or Uraguay

asked by Amanda on September 21, 2007
2. ## Physics

You walk 25 m south and 40 m east. Find the magnitude and direction of the resultant displacement both graphically and algebraically. Magnitude is 47.16 What is the degree?

asked by HS Senior on October 1, 2018
3. ## physics

vicky walks 8km east, the 5km south and final 6km west. find her final displacement

asked by Vanne on June 23, 2013
4. ## Physics

forces of 185N and 245N act east and south respectively on an 80 kg mass.If the force of friction is ZERO , find the accleration of the mass.

asked by Jo on December 9, 2010
5. ## Social studies

Which of the following is an accurate comparison of Adams and Jackson A. Adam supported efforts to promote the group of businesses well Jackson supported efforts to help the ordinary man B. Jackson supported the idea of high tariffs to increase revenue but

asked by Anything helps on November 28, 2017
6. ## math

If a satellite completes an orbit 820 miles above the earth in 11 hours at a velocity of 22,000 mph, how long would it take a satellite to complete an orbit if it is at 1400 miles above the earth at a velocity of 36,000 mph? (Use 36,000 miles as the radius

asked by vera on August 4, 2012
7. ## Math

Two ships are moving toward a rendezvous point. Ship A is 5km east and 4km north of the point Ship B is 1km west and 2km north pf the point. How many km part are the two ships? Please . I really need your help

asked by Niall on December 1, 2014
8. ## Pre-Calculus

A 15N force acting at 15 degrees north of east and a 18N force acting at 79 degrees north of west act concurrently on an object. What is the magnitude and direction of a third force that produces equilibrium on the object? Show sketch and work. ------

asked by Alexis on March 3, 2014
9. ## science

Couple of questions. Why does the earth keep moving? The engine of a rocket applies a continual force to push the rocket along. When the engine stops what will happen? I think the rocket will stop acceleration You need to be aware of the concept of

asked by Kim on May 8, 2007
10. ## Geography (Ms. Sue)

Which countries besides Spain sent settlers to South America? A: Besides Spain, Portugal, France, and the Netherlands sent settlers to South America?

asked by Anonymous on September 27, 2013
11. ## Chemistry

Draw Bohr diagrams of the following: A) O and O2- I know how to draw the regular O bohr diagram. 2 electrons in the first shell, and 6 in the outer one, but I don't get how to draw a 02- diagram. Do I just take away 2 electrons from the outer shell?

asked by Anonymous on September 18, 2010
12. ## Social Studies

19. Select a new deal program that helped improve the lives of South Carolinians. explain what the program improved and how it helped the people of South Carolina. 20. Explain how rationing affected the people on the home front during World War II. How did

asked by a person on May 4, 2018
13. ## INTRO TO PLANET EARTH

....Unit 2 Which type of eclipse would you expect to see if the moon passes directly between Earth and the Sun A. A solar Eclipse B. a lunar eclipse C. a total lunar eclipse D. a penumbra Which of the following happens during a lunar eclipse? A.a lunar

asked by Chocalae Bonny on September 12, 2018
14. ## Physics

A beam of protons is accelerated through a potential difference of 0.745 kV and then enters a uniform magnetic field traveling perpendicular to the field. (a) What magnitude of field is needed to bend these protons in a circular arc of diameter 1.75 m? (b)

asked by J on February 25, 2008
15. ## physics

An explorer is caught in a whiteout (in which the snowfall is so thick that the ground cannot be distinguished from the sky) while returning to base camp. He was supposed to travel due north for 4.5 km, but when the snow clears, he discovers that he

asked by kate on September 14, 2009
16. ## physics

The power output in the sun is about 4.00 x 10^26W. (a). Calculate the power per unit area (intensity), in kilowatts per square meter, reaching Earth's upper atmosphere from the sun. The radius of the Earth's orbit is 1.5 x 10^11m.

asked by Anonymous on March 5, 2015
17. ## physics

An artificial sattelite as a mars of 600 kg and moving towards moon.calculate its kinetic energy and potential energy in mJ relative to the earth when it is 50 km from launching and moving at 2500 km/h take acceleration of earth gravitational field as 790

18. ## Physical Science

The distance from earth to the sun is 1.5x10 to the 11th power minutes and light travels at a speed of 3.0x10 to the 8th power m/s. How long does it take sunlight to reach the earth? Give answer in minutes and seconds.

asked by Belaune on January 22, 2013
19. ## biology

What is the source of energy driving the hydrolic cycle? a. evaporation of the ocean water b. heat conducted from the earth's core to the surface c. radiant heat from the sun d. air currents returning to the earth's surface

asked by BECKY on February 24, 2010
20. ## Physics

A skydiver is jumping from an airplane traveling at 10.0 m/s. The plane is 3520 m above the earth. The sky diver pulls his cord at 1760 m above the earth. Neglecting air resistance, how far does the skydiver travel horizontally before pulling the cord?

asked by Isis on June 14, 2013
21. ## science

Look at the picture on the immediate left here: http://en.wikipedia.org/wiki/Earth's_magnetic_field Also: http://image.gsfc.nasa.gov/poetry/magnetism/magnetism.html HOW IS THE EARTH'S MAGTISM USEFUL thanks it helped me alot!!!!!!!!!!!

asked by Lance on December 13, 2006
22. ## Science

A space probe on the surface of Mars sends a radio signal back to earth a distance of 8.66x0^7 km. Radio waves travel at the speed of light (3:00x10^8 m/s . How many seconds does it take the signal to reach earth

asked by Sherri on January 22, 2016
23. ## physics

the rate at which radiant energy from the sun reaches the earth's upper atmosphere is about 1.50kW/m2. the distance from the earth to the sun is 1.50*10^11m, and the radius of the sun is 6.96 * 10^8m. if the sun radiates as an ideal black body (e=1), what

asked by jean on May 7, 2017
24. ## Physics

The shuttle is orbiting the earth at a distance of 500km above the earths surface. Assumingan astronaut has a mass of 72kg, what is the force of gravity upon him or her? You may assume the earth has a mass of 5.98 x 10^24kg and a radius from the center to

asked by Bianca on January 19, 2011
25. ## algebra

The weight of an object follows the equation w=Cr^-2, where C is the constant and r is the distance the object is from the center of the earth. a. solve the equation for r. b. Suppose the object is 100 pounds when at sea level. Find the value of C that

asked by Carson on March 6, 2010
26. ## Science

If the earth exerts a 500 N gravitational force on an object in near space, how much force does this object exert on the earth, and by what law can this be asserted?

asked by Alyssa on May 18, 2016
27. ## Science

Here is a question on my science worksheet, "if a projectile's fall matches Earth's 'BLANK', the projectile will not hit earth." i need help figuring out what would go in the blank!

asked by Morgan on February 25, 2010
28. ## Physics

A canoe has a velocity of 0.400 southeast relative to the earth. The canoe is on a river that is flowing at 0.450 east relative to the earth.

asked by Anonymous on August 13, 2012
29. ## physics

An astronaut of mass 80 kg lands on a planet,the radius of which is half that of the earth and the mass of which is three times that of earth.what will be the force of attraction which this planet has on him?

asked by natty on February 26, 2014
30. ## Physics

Acceleration due to gravity on the moon's surface is 1/6th that on the earth . An object weight 900N on the earth . What does it weight on the moon ?

asked by Maryam on November 16, 2013
31. ## math

The ratio of an object's weight on Earth to its weight on Neptune is 5 : 7. How much would a person who weighs 150 pounds on Earth weigh on Neptune?

asked by mark on December 3, 2014
32. ## physic

The Moon orbits Earth in a nearly circular orbit that lasts 27.32 days. Determine the distance from the surface of the Moon to the surface of Earth.

asked by joy on February 24, 2018
33. ## History | Need help, i'm in a rush =(

the underground railroad used escape routes that went throughout the south. based on that fact, which of the following conclusions could be made? a) the southern states were leaning toward emancipation of the slaves b) slaves were hopeful to acquire jobs

asked by Mia Larson Highschool on November 11, 2016
34. ## History

1. During the 1970s, many south Carolinians favored improving relations with the soviet union because it would A. end American involvement in Vietnam B. decrease the risk of nuclear war*** C. put greater pressure on china D. escalate the arms race. 2. Why

asked by what on June 3, 2014
35. ## Physics equation?

can anybody tell me an equation that can be used to find the number of electrons flowing through an LED every second? and also refer or give me any information that could explain another mechanism (apart from the fact that they denote energy to a single

asked by AllyKat on February 12, 2008
36. ## college

Find the minimum initial speed of a projectile in order for it to reach a height of 2039 km above the surface of the earth.

asked by Anonymous on April 29, 2010
37. ## Physics 203

An object is projected upward from the surface of the Earth with an initial speed of 4.6 km/s. Find the maximum height it reaches.

asked by Kayla on April 26, 2011
38. ## Physics

An object weighs 100N on the earth's surface. Find its weight at a point P with orbital radius 2R. [g = 10NKg-1

asked by Majiri on September 18, 2017
39. ## Physics

Find the minimum initial speed of a projectile in order for it to reach a height of 2022 km above the surface of the earth.

asked by Rebecca on November 12, 2015
40. ## Statics

Two identical spheres of radius 80mm and mass 2 kg on the surface of the earth are placed in contact. Find the gravitational attraction between them.

asked by Woz on April 19, 2013
41. ## word riddle help please

to find the clue you must search the text Cause in the Late evening when dark is dim and Peaches are gray walk 1 north and then head east, till you find the pretty thing and tell me what it is! Without the text that needs to be searched, we cannot help

asked by sharon on December 11, 2006
42. ## Geography

What are the two South American countries with no known oil reserves? This site lists at least four South American countries with no known oil reserves. http://www.eia.doe.gov/emeu/international/reserves.html

asked by elizabeth on November 16, 2006
43. ## Physics

I'm preparing for a test. Can anyone check my answer for all these questions? These are my questions: 1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of

asked by Matt Damon on January 31, 2016
44. ## Physics

I'm preparing for a test. Can anyone check my answer for all these questions? These are my questions: 1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of

asked by KevJumba on January 30, 2016

region Population land area 1000mi^2 Asia 4,028,000,000 17,400 North America 305,000,000 9,400 1. Compare the populations per square mile in asia to the population per square mile in north america A: Asia 231.49mi^2 North America 32.45mi.^2 could some one

asked by tammy on January 24, 2007
46. ## CHECK MY WORLD HISTORY ANSWERS

1 star* at the end of each question and multiple stars*** at the end of my answer 1. Which laws called for strict separation of the races in the South? * anti-discrimination laws Plessy v. Ferguson laws Jim Crow laws**** Boycott Laws 2. All of the

asked by catherine on May 25, 2016
47. ## Physics

When U238 decays into Pb206 via alpha and beta decay, what are the byproducts of the decay? A) 8 alpha particles and 6 beta rays. B) 8 alpha particles, 6 electrons, 6 neutrinos, and energy. MY ANSWER . C) 16 alpha particles, 16 beta rays, and energy. D) 16

asked by Anonymous on October 26, 2011
48. ## physics

At one instant a bicyclist is 58.0 m due east of a park's flagpole, going due south with a speed of 13.0 m/s. Then 35.0 s later, the cyclist is 58.0 m due north of the flagpole, going due east with a speed of 13.0 m/s. For the cyclist in this 35.0 s

asked by kristy on September 17, 2013

A thin, horizontal 20cm×20cm copper plate is charged with 1.7×10^10 electrons. Consider the electrons are uniformly distributed on the surface. A. What is the strength of the electric field 0.1 mm above the center of the top surface of the plate? E=____

asked by Josh on May 21, 2014
50. ## science

1. Why do earthquakes occur along the San Andreas Fault? a. Two plates meet at the San Andreas Fault and they slide next to each other causing earthquakes b. Two plates converge at the San Andreas Fault causing earthquakes*** c. Two plates pull apart at

asked by what on May 4, 2014
51. ## Space craft

How will you overcome these challenges with the design of your spacecraft? (I decided to choose the inner planet mercury) I put: Mercury is very different than Earth. It’s far rougher than earth; the main problem is the temperature. Humans can’t just

asked by Areana on November 5, 2015
52. ## science

other than jupiter having a solid core like earth what else does jupiter have in common with earth?{please help}

asked by shayla on December 16, 2008
53. ## ^NeEd HeLp^

What iz d. location ov d. MOON with respect 2 d. EARTH? that iz, iz d. MOON inside or outside ov d. EARTH?

asked by Ekingdeft on January 3, 2015
54. ## Science

How does the mass of the moon and the earth help the moon stay in its orbit around the earth?

asked by Jaime on February 22, 2018
55. ## science

Suppose the moon were closer to Earth. How would the force between Earth and the moon be different?

asked by jasfjdkla on September 20, 2009
56. ## physics

A student on Earth has a mass of 55.5 kg. With how much force does the Earth pull on the student?

asked by matisse on November 5, 2012
57. ## Physics

how far from the center of the earth would a person with a weight of 469N on earth have to be to have a weight off 55.4N?

asked by nick on March 11, 2013
58. ## Geometry

Imagine that all the people on Earth could stand side by side together. How much area would be needed? Would all the people on earth fit in Rhode Island? Explain your reasoning. Rhode Island, the smallest state in terms of area, has a land area of 1000

asked by Elizabeth Barnes on October 21, 2012
59. ## algebra 2

a car enters 15 miles north of a city. it travels due north at an average speed of 62.5 miles per hour. write an equation to model the car's distance D from the city after traveling for H hours. graph the equation

asked by mel on September 28, 2011
60. ## science

I have a picture that shows what scientists think parts of North America looked like 300 million yrs ago. ie, trees, plants , insects, rocks. How do scientists know what North America looked like so long ago, if there were no people around to see it?

asked by Briana on December 2, 2008
61. ## Physics

The Voyager 1 spacecraft is at the edge of the solar system, about 11 billion km away. (a) How long does a radio signal from Voyager 1 take to get to the Earth? (b) Its radio works at 8 GHz. What is the wavelength? (c) What type of light is this? (d)

asked by Kimia on May 10, 2017
62. ## ALG/TRIG

Lost is an understatement..please help me understand this. Orbits and Distance Johannes Kepler (1571–1630)discovered a relationship between a planet’s distance D from the sun and the time T it takes to orbit the sun. This formula is , where T is in

asked by Lost on March 6, 2012
63. ## Lesson 6: The War’s End CE 2016 Social Studies 6 A

Just need a little help on this topic: In Lincoln's Second Inaugural Address, he says "with malice toward none, with charity for all..." What does this quote reveal about Lincoln's attitude toward the South? A. forgiveness B. hatred C. indifference D. envy

asked by Chocalae Bonny on September 12, 2018
64. ## Physics

A car is driven east for a distance of 46 km, then north for 27 km, and then in a direction 35° east of north for 24 km. Determine the angle (from east) of the car's total displacement measured from its starting direction.

asked by Evin on September 13, 2010
65. ## Physics

As two boats approach the marina, the velocity of boat 1 relative to boat 2 is 2.29 m/s in a direction 37.8° east of north. If boat 1 has a velocity that is 0.745 m/s due north, what is the magnitude of the velocity of boat 2?

asked by Nai on February 20, 2013
66. ## Physics

A taxicab moves 5 blocks due north, 5 blocks due east, and another 2 blocks due north. Assume all blocks are of equal size. What is the magnitude of the taxi's displacement?

asked by Mary on September 27, 2016
67. ## Physics

An 11N force acting due north and a 22-N force acting 30° North of east act concurrently on a point. What is the equilibrant force at that point? I'm having such a hard time.=(

asked by Marvin on July 3, 2016
68. ## MATH

An automobile travel 3 miles due north then 5 miles due north of reset

asked by Audu on August 1, 2018
69. ## Trigo

a ship sails due north from port 90 km,than 40 km east and then 70 km north, how far is the ship from port

asked by Dend on January 31, 2015
70. ## geography

Which nation is farther north, Egypt or Greece? My answer is - Greece is farther north. Am I right?

asked by Reed on September 19, 2011
71. ## Physics - Compton Scattering

X rays of wavelength 0.0166 nm are directed in the positive direction of an x axis onto a target containing loosely bound electrons. For Compton scattering from one of those electrons, at an angle of 169°, what are (a) the Compton shift, (b) the

asked by Sam on October 4, 2018
72. ## physics

What is responsible for earth's elliptical orbit around the sun? a. the gravitational pull of the sun b. magnetic forces both attracting and repelling other planetary bodies c. momentum caused by the earth's rotation d. balance between centripetal and

73. ## MATH

Is there a shorter way to answer this question? Radio waves ina vacuum travel a distance equal to seven times the circumference of earth in 1 s. If the radius of Earth is 6 318 138.7m, what is the speed of the radio waves in kilometres per hour?

asked by Anonymous on September 16, 2010
74. ## Physics

Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used

asked by BrookeNeed on November 18, 2016
75. ## PHYSICS

Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used

asked by Anonymous on November 4, 2015
76. ## Phys Science

Good afternoon tutors..I need help on a few problems.Im really stuck.. 1) the space shuttle orbits at an altitude of approximately 200km above the surface of the earth. If the radius of the earth itself is 6380km, whats the acceleration de to gravity at

asked by 45843 on July 19, 2011
77. ## Physics

Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used

asked by Bob on January 29, 2013
78. ## Physics

Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used

asked by Cat on January 30, 2013
79. ## Physics

An Earth satellite moves in a circular orbit 946 km above Earth's surface with a period of 103.8 min. What are (a) the speed and (b) the magnitude of the centripetal acceleration of the satellite? I got an answer of 7388.897 m/s for part a, but I'm stuck

asked by Amber on February 3, 2015
80. ## marketing

• What challenges do specialized magazines such as Mother Earth News face hen trying to entice advertisers? Create a pitch to a potential green-product advertiser stating the benefits of advertising in Mother Earth News.

asked by Lisa on September 17, 2013
81. ## math

Help? The summit of Mount Everest is approximately 29,035 ft above sea level. What is the distance from the summit to the horizon, rounded to the nearest mile? Assume that the distance from the Earth's center to any point on Earth's surface is 4,000 miles.

asked by Cole on June 28, 2016
82. ## Physics

Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used

asked by Ashley on January 30, 2013

Which of the following best describes what causes the phases of the moon? A. The alignment of the sun, Earth and moon (I think it's this one) B. The speed of the moon around the Earth C. The speed of the Earth around the sun D. The alignment of the planets

asked by Music Lover 14 on December 3, 2016
84. ## CHEMISTRY

list three differences between molecular and ionic compounds, and explain how they relate to the differences in bond types.....how do i relate to the differences in bond types? List the differences and we'll talk about how they relate to the bond type. 1.

asked by INEEDHELP!!! on December 7, 2006
85. ## math

Two cars leave the same point at noon. One car travels North and the other car travels East. Suppose the North bound car is travling 40mph and after two hours, the two cars are 100 miles apart. How fast is the other car going?

asked by dell on November 2, 2012
86. ## Word problem

earth and cement block filling a box weighs 390mlb.the block weigh 2.4times as much as water and earth weighs 1.5times as much as water.water filling the box weighs 2000lb.find the weigh of the cement block.bl? plz help help help!!!! Show work

asked by Collins on January 6, 2016

Which ones are true a. Some people in northern Chad are nomadic and raise camels and plant crops in oases due to lack of arable soil. b. In parts of West Africa they are careful not to cut down trees to make arable land. c. Tension exists in Egypt between

asked by Anonymous on November 13, 2014
88. ## Physics

The force exerted by the wind on the sails of a sailboat is 310 N north. The water exerts a force of 240 N east. If the boat (including its crew) has a mass of 330 kg, what are the magnitude and direction of its acceleration? magnitude in m/s2 direction in

asked by Elisa on June 9, 2008
89. ## SCIENCE

1. where does the conversation current in the mantle obtain its heat energy? a. earths core and crust b. earths mantle c. earths core and mantle*** d. earths mantle 2. How do convection currents cause movement of earth's plates? a. The weathering of rocks

1. where does the conversation current in the mantle obtain its heat energy? a. earths core and crust b. earths mantle c. earths core and mantle*** d. earths mantle 2. How do convection currents cause movement of earth's plates? a. The weathering of rocks

asked by what on May 7, 2014
91. ## physics

A military helicopter on a training mission is flying horizontally at a speed of 70.0 m/s and accidentally drops a bomb (fortunately not armed) at an elevation of 320 m. You can ignore air resistance. (a) How much time is required for the bomb to reach the

asked by Anonymous on October 24, 2010
92. ## phy

(Q1)What is the orbital radius and speed of a synchronous satellite which orbits the earth once every 24h? Take G=0.0000000000667Nm2/kg2. Mass of the earth is 598000000kg (a)4200000m and 31000m/s (b)5600000m and 4300m/s (c)430000m and 5000m/s(d)3400000m

asked by ikye on July 5, 2013
93. ## Chemistry

In 1909, Robert Millikan performed an experiment involving tiny, charged drops of oil. The drops were charged because they had picked up extra electrons. Millikan was able to measure the charge on each drop in coulombs. Here is an example of what his data

asked by Syeda on March 5, 2010
94. ## Pre-Algebra

Courtnytravels south on her bicycle riding 8 miles per hour. One hour later, her friend Horacio starts riding his bicycle from the same location. If he travels south at 10 miles per hour, how long will it take him to catch Courtney?

asked by Ola on August 18, 2010
95. ## Chemistry

How did the metal atoms become ions? Metal atoms became ions by losing electrons to form positively charged ions(cations). How did the nonmetal atoms become ions? Nonmetal atoms became ions by gaining electrons to form negative ions(anions).

asked by Damon on July 8, 2010
96. ## Physics 12

What is the gtravitational potential energy of a 2.00e3 kg staellite that is in an orbit that has a radius of 9.90e6 m around the earth? Use gravitational potential energy=0 at r=‡ (answer=-2.01e11J) What is the work done against gravity on the

asked by Erin on April 16, 2007
97. ## physics

Two Earth satellites, A and B, each of mass m, are to be launched into circular orbits about Earth's center. Satellite A is to orbit at an altitude of 7460 km. Satellite B is to orbit at an altitude of 20500 km. The radius of Earth REis 6370 km. (a) What

asked by Anonymous on January 3, 2011
98. ## Social Studies

1) Which of the following BEST describes the Southern attitude toward goods and supplies at the beginning of the Civil War? A:they believed they could get necessary goods from mexico B:they believed they needed to develop factories*** C:they believed they

asked by Makayla Caldwell on February 29, 2016
99. ## physics

An object has three component velocities: 5mi/hr toward the east, 12mi/hr toward the south, and 8mi/hr toward the northwest. Find the resultant velocity of the object. For resultant velocity, I got 6mi/hr I don't understand how to find the direction angle

asked by Emily on October 11, 2014
100. ## Physics

An object has three component velocities: 5mi/hr toward the east, 12mi/hr toward the south, and 8mi/hr toward the northwest. Find the resultant velocity of the object. For resultant velocity, I got 6mi/hr I don't understand how to find the direction angle

asked by Anonymous on October 11, 2014