# 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 59
1. ## History Check My Answer!

Hi! I just have 1 question that I need checking. Why did South Carolinians believe they had the right to secede from the Union? A. States had more power than the federal government B. The new president allowed South Carolina to secede C. They entered the

asked by Jacquelyn on February 2, 2016
2. ## Social Studies

Can you please help me out with a few problems? 1. Which of the following most caused the Civil War? A.) different views on communism and democracy B.) different views on the use of the atomic bomb C.) the division of Germany, Austria, and Berlin into

asked by SchoolHelp on May 6, 2016
3. ## physics

The summit of a mountain, 2270 above base camp, is measured on a map to be 4610 horizontally from the camp in a direction 30.9 west of north.What are the components of the displacement vector from camp to summit? Choose the axis east, axis north, and axis

asked by Anonymous on January 29, 2012
4. ## physics PLEASE HELP

Add the two component vectors from Sample Problem 1 algebraically to erify that they equal the given vector The two component vectors are: 8.6m(North) and 12m (west) The given vector is 15m(West 35 degrees North)

asked by Krystal on October 1, 2014
5. ## physics

A wind is blowing at 30 degree west of north at 20km/hr. A bird is flying in the wind and its velocity relative to the ground is 90km/hr west of north. Calculate the velocity and direction of the bird

asked by mr. samwel on November 12, 2018
6. ## Physics help

Add the two component vectors from Sample Problem 1 algebraically to erify that they equal the given vector The two component vectors are: 8.6m(North) and 12m (west) The given vector is 15m(West 35 degrees North)

asked by Kai on September 30, 2014
7. ## Physics please help

Add the two component vectors from Sample Problem 1 algebraically to erify that they equal the given vector The two component vectors are: 8.6m(North) and 12m (west) The given vector is 15m(West 35 degrees North)

asked by Caterina on September 30, 2014
8. ## Science

the pilot of a private plane flies 20km in a direction 60 degrees north of east,then 30km straight east,then 10km straight north.how far and in what direction is the plane from the starting point

asked by Bishal on August 7, 2017
9. ## Trig

You and a friend are rowing a boat 8.5 KPH heading north. A cross current is moving 3.2 KPH at an angle of 38 degrees north of the west direction. How fast are you actually moving and what direction are you actually heading?

asked by Kim on May 27, 2014
10. ## Physics

The intensity of sunlight reaching the earth is 1360 W/m^2 Part A: Assuming all the sunlight is absorbed, what is the radiation-pressure force on the earth? Give your answer in newtons. Part B: Give your answer as a percentage of the sun's gravitational

asked by Jill on April 25, 2008
11. ## 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 kylie on January 4, 2011
12. ## Physics

The moon is 384,000 km from the earth and makes 1 revolution in 27.3 days. Find its angular and linear speeds in its orbit.

asked by Art on January 31, 2011
13. ## Algebra

Available evidence suggests that about 20 percent of the asteroid’s mass turned to dust and spread uniformly over Earth after eventually settling out of the upper atmosphere. This dust amounted to about 0.02 g/cm^2 of Earth’s surface. The asteroid very

asked by Kate on August 16, 2010
14. ## physics 2

Two identical positive charges are placed 15 cm apart and the magnitude of the electric force between them is 5.4 Newtons. They then exchange charge (one charge loses some electrons and the other gains the same amount of electrons), but they both still

asked by Jessica on January 18, 2013
15. ## physics

A bird watcher meanders through the woods, walking 0.45 km due east, 0.60 km due south, and 2.70 km in a direction 37.0° north of west. The time required for this trip is 4.00 h. (a) Determine the magnitude and direction (relative to due west) of the bird

asked by demi on September 5, 2010
16. ## geography

Currently doing a map of the region of East Asia. The countries included according to Wikipedia are: People's Republic of China, Taiwan, Japan, North Korea and South Korea. Information that I have to identify for this region are: location of major

asked by Christian on March 25, 2008
17. ## Social studies

Why did South Carolinians believe that they had the right to secede from the union? 1. States had more power than federal government 2. The new president allowed South Carolina to secede. 3. They entered the union willingly so they could leave when they

asked by Help on February 2, 2016
18. ## science

1) When an alkali metal is involved in a chemical reaction with a nonmetal, what charge will its atoms most likely form? 1- 2+ 1+ 2- 2) Which properties increase when moving down a group of the periodic table? Select all that apply. reactivity valence

asked by help me please on December 11, 2018
19. ## Trigonometry

A pilot is flying at 200 miles per hour (airspeed), and wants his flight path (course or actual direction) to be on a bearing of 237 degrees. A wind is blowing for the north at 40 miles per hour. Find the bearing he should fly, and find the plane's ground

asked by Monk on December 1, 2010
20. ## 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 5.7 km, but when the snow clears, he discovers that he

asked by Brett on January 21, 2012
21. ## physics

need help with doing this combining vector question A jogger runs with a velocity of 6km/h 25 degrees north west for 35 minutes and then changes direction , jogging for 20 minutes at 4.5km/h 65 degrees east of north. using a vector diagram determine the

asked by jake on March 2, 2010
22. ## 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 5.7 km, but when the snow clears, he discovers that he

asked by turk on October 10, 2011
23. ## Physics

Judy walks a certain distance due north, then walks twice as far due west. At the end of her trip, the straight-line distance from her starting point to her final position is 112m. a) What is the length of each leg of the trip? b) What is the direction of

asked by Anonymous on September 25, 2016
24. ## science

How does gravity affect the moon? a) it pulls the moon toward earth b) it pushes the moon away from earth c) t allows the moon to move in a straight line d) it keeps the moon from colliding with the sun

asked by victoria on October 30, 2013
25. ## Social Studies

Answer each question below with one of the three types of maps described below Physical Thematic Political Which type of map would you use to find out if Denver is located in the Rocky Mountains? Physical Which type of map would you use to find out what

asked by Jerald on January 9, 2013
26. ## cHEMISTRY

wHAT IS THE SYMBOL FOR THE ION WITH 13 PROTONS AND TEN ELECTRONS? CAN U EXPLAIN HOW TO GET YOUR ANSWER, AND CAN YOU GIVE ME A WEBSITE THAT HELPS ME WITH CHEMISTRY 13 protons will be element with atomic number of 13. Look on the periodic table and see

asked by Googly Eyez on October 15, 2006
27. ## College Physics II

What is the de Broglie wavelength of electrons with the following value of kinetic energy? 1.06 eV; What is the de Broglie wavelength of electrons with the following value of kinetic energy? 1.06 keV.

asked by VJC on November 25, 2010
28. ## PHysics

Vector a has a magnitude of 5 m and is directed east. vector b has magnitude of 4m and is directed 35 degrees west of north. A)What is the magnitude and direction of vector a + vector b b)What is the magnitude and direction of vector b- vector a? I should

asked by Jesse on October 2, 2006
29. ## physics....

Cherenkov radiation is light emitted by a particle moving through a medium with a speed greater than the speed of light in the medium. (Note: The speed of the particle is not greater than the speed of light in a vacuum.) Consider a beam of electrons

asked by matin on June 22, 2012
30. ## waves and optics

Cherenkov radiation is light emitted by a particle moving through a medium with a speed greater than the speed of light in the medium. (Note: The speed of the particle is not greater than the speed of light in a vacuum.) Consider a beam of electrons

asked by jennifer on May 27, 2012
31. ## Pythagorean Theorem

Jan skips 5 miles north, 4 miles east, 6 miles north, 16 miles east and 4 miles north. How far is Jan from where she started?

asked by Anonymous on January 18, 2012
32. ## MATHS ( Geometry)

Abhay drives 4km to the north and then 3 km to the east . Find the distance between the starting point and the terminating point .

asked by SHERICA on December 3, 2016
33. ## Physics

A man travels 7km due north,then 10km due east.find the resultant displacement.

asked by Tammy on November 5, 2013
34. ## Physics

Find the resultant of these two vectors: 2.00 * 10^2 units due east and 4.00 * 10^2 units 30.0degrees north of west. please SHOW me how to do this

asked by y912f on February 5, 2009
35. ## Science

A cyclist move 4km in the east diraction then he turn to north and move 3km . Find displacement.

asked by Neha on June 23, 2017
36. ## maths

two towns A and B are 96km apart a is due north of B. town C is 80km from B and is on a bearing of 56 degree from B find distance of town A and C

asked by desai on June 21, 2016
37. ## Geography

Where can I find all the information I need regarding a specific North American State? Example: Florida...What is the State motto, flower, capital etc...

asked by John on November 3, 2009
38. ## physics

dissplacement vector A is 4.5 km North, vector B is 3.0 km 50 degrees N of W. Find their resultant

asked by Svetoka on September 15, 2016
39. ## social studies

The Pilgrims hoped to find blank blank in North America.

asked by stephanie on October 26, 2011
40. ## PHY

Express the direction 331° CW from the +x-axis in the following different ways. For this problem north is positive y and east is positive x. 1) east of north 2) above the +x-axis 3) right of the vertical in quadrant 1 4) CW from the -y-axis

asked by ami on August 22, 2010
41. ## physic

golf is just as popular as it is on earth. A golfer tees off and drives the ball 4.5 times as far as he would have on earth, given the same velocities on both planets. The ball is launched at a speed of 54 m/s at an angle of 60¡ã above the horizontal.

asked by kya on October 24, 2010
42. ## physics

A law enforcement officer in an intergalactic "police car" turns on a red flashing light and sees it generate a flash every 1.5 s. A person on earth measures that the time between flashes is 2.9 s. How fast is the "police car" moving relative to the earth?

asked by rick on April 15, 2008
43. ## additional science: physics

Hello i have 2 questions in total. 1) The meteor enters the Earth’s atmosphere with an acceleration of approximately 9.7 m/s2 and with a force acting on it of 1.94 N. What is the mass of the meteor? Show your calculations. 2) Compare this value of the

asked by Ellioy on November 9, 2013
44. ## Physics

A satellite orbits at a distance from the Earth's center of abut 3.00 earth radii and takes 7.30 hours to go around once. What distance (in meters) does the satellite travel in one day? And, what is the orbital velocity (in m/s)? I'm completely lost. I

asked by Leslie on June 23, 2016
45. ## Someone please help

How has the population of South Carolina changed over the past one hundred years? Explain whether the state has become more rural or more urban, and describe at least three challenges that accompany this shift in population. All I know is that South

asked by Mame on June 4, 2016
46. ## Astronomy

Compared to the Sun's gravitational force on the Earth, what is the Sun's gravitational force on Jupiter. Jupiter's average distance from the Sun=5AU Earth's average distance from the Sun=1AU Jupiter's mass is 300 times larger than Earth. I think the

asked by Anonymous on September 15, 2010
47. ## English

Read the following sentences adapted from p. 129 of The Watsons Go to Birmingham-1963. The boys got into bed. Byron was up in his top bunk and Kenny was down in the bottom. Kenny was so excited that he was talking a mile a minute-although he realized that

asked by Rose on January 4, 2018
48. ## Language Arts

In " Raymond's Run" which detail supports the prediction that Squeaky will not let Gretchen win the race? A. Squeaky is insulted when Mr. Pearson suggests she give someone else "a break" this year.************** B. Squeaky doesn't even bother to look when

asked by Teddy on September 25, 2017
49. ## physics

A plane leaves Seattle, flies 84.0{\rm mi} at 21.0^\circ north of east, and then changes direction to 52.0^\circ south of east. After flying at 120{\rm mi} in this new direction, the pilot must make an emergency landing on a field. The Seattle airport

asked by Julio on August 9, 2012
50. ## Physics

A gps tracker at their base camp shows the location of the first team as 38 km away, 23° north of west, and the second team as 34 km away, 31° east of north. When the first team uses its gps to check the position of the second team, what does it give for

asked by Leah on September 19, 2017
51. ## Chem- quantum question

Hi. My teacher is giving us a test tomorrow on quantum numbers and Iunderstand it except for Noble gas configuration. I saw the question below on it but it's not really what I need to know so any help would be great. :) Question: My teacher said he'll give

asked by Amy on March 20, 2007
52. ## trigonometry

A satellite is orbiting the Earth in a circular orbit. It orbits the Earth 3 complete revolutions every 24 hours. How many radians does it travel in 19 hours? i think its 19pi radians or 19/2pi radians im kinda conufsed about what i did..need help

asked by y912f on January 17, 2009
53. ## Algebra

The diameter of the moon is about 3476 kilometers. The distance from earth to moon is about 384,400 kilometers. About how many moons could be lined up in a row between earth and the moon? Round to the nearest whole number. Please help answer thanks

asked by Ms. Liz on October 7, 2014
54. ## Science

Name ONE of the air masses that can be found in North America (remember to use both the temperature and humidity descriptors). I searched everywhere, even looked back at my lesson, and I still can't find out, if you can help me or send me a link, I will be

asked by Baby_Banana on March 7, 2018
55. ## georgia history

what was the main reason for British and colonization of north America? A) to find gold B) to spread Catholicism C) to increase wealth through mercantilism D) to build a strong alliance with the spanish

asked by zack on September 27, 2018
56. ## Geography

Employment opportunities were limited in Tijuana. Manuel, who had been unemployed for several months, decided to join a group of people traveling north to find work. What concept is described by the paragraph above?

asked by george on December 15, 2009
57. ## EARTH SCIENCE

I need four reasons the layers of the egg compare to the earth. so I have three 1. The shell compares to the crust 2. The white compares to the Mantle 3. The yolk is the core Then they also want : describe two other ways the egg compares to the earth.

asked by JJ on September 22, 2009
58. ## 6th math

Light travels at 186,000 miles per second. Light takes about 11⁄3 seconds to travel from the earth to the moon. Calculate the distance between the earth and the moon based on the speed of light. ???

asked by princessleaya on November 14, 2017
59. ## pre-calculus

A plane flies due west at 250 km/hour while the wind blows south at 70 km/hour. Find the planes resultant velocity and direction.

asked by Zene on April 13, 2011
60. ## world geography

Can you give me a link with an excellent map to find the answer to these questions? What oceans border Australia? And What continent is south of the four major oceans of the world? Thank You!!

asked by Louise on October 3, 2011
61. ## Physics

You drive due east at 86km/h for 55min . Then you follow a road going 60 degrees south of east, going 99km/h for another 40min . Find your total displacement

asked by Wykeena on June 12, 2011
62. ## Physic 210

you drive due east at 85km/h for 50min. then you follow a road going 60 degrees south of east, going 90km/h for another 30min. Find your total displacement.

asked by Suyali on September 11, 2012
63. ## Social Studies

Hi, I'm working on an essay and just wanted to know if anyone had an example you can find and might be willing to share with me. I looked and had no luck. Its an essay where you pretend to interview people and tell what happened in colonial South America.

asked by S on December 20, 2018
64. ## Physics

You drive due east at 81km/h for 54mins . Then you follow a road going 60 degrees south of east, going 91km/h for another 39mins . Find the x and y components of the displacement

asked by Tiggie on February 8, 2012
65. ## Physics

An object is released from rest at height h above the surface of the Earth, where h is much smaller than the radius of the Earth. It takes t seconds to fall to the ground. At what height should this object be released from rest in order to take 2t seconds

asked by Liza on June 23, 2012
66. ## Social studies

The Underground Railroad used escape routes that went throughout the South. Based on that fact, which of the following conclusions could be made? This is only one question and I am from connexus 8th grade if someone could give me the answers to the whole

asked by Anonymouse on November 15, 2016
67. ## World History

What was significant about the Battle of Dien Bien Phu? The battle proved that the North Vietnamese could defeat the US Army through guerilla warfare. The battle resulted in the withdrawal of the French military from Vietnam. The battle led the United

asked by Mason on January 30, 2018
68. ## Physics

As two boats approach the marina, the velocity of boat 1 relative to boat 2 is 2.20m/s in a direction 47.0 ∘ East of North. If boat 1 has a velocity that is 0.745m/s due North, what is the(magnitude and direction) of boat 2?

asked by Josh on September 22, 2014
69. ## Electrochemistry

Hi, I'm in my final year of high school doing an electrochemistry unit and there is a concept I just don't really get. I would appreciate all helps please-- Redox reaction half reactions are: Oxidation: Zn(s) --> Zn 2+ (aq) + 2e- Reduction: Cu2+ (aq) + 2e-

asked by Sienna on January 14, 2007
70. ## greek mythology

1.All the following were writers of ancient Greek plays and poetry exept a.Homer b.Sophocles c.Joseph Campbell 2.Chaos gave birth to the following exept a.Uranus(heaven) b.Tartarus(under earth) c.Gaea(earth) 3.Gaea gave birth to the following exept

asked by Josh on January 23, 2007
71. ## SCTD

Physics a satellite orbiting 3.22 times 10 to the 5th power meters above the surface of the earth get the mass of the satellite is 3.80 times 10 to the 4th kilograms what is the weight or gravitational force exerted on the satellite by the earth?

asked by Jason on July 7, 2015
72. ## Physics

A deep space probe moves away from the earth with a speed of 0.75c. An antenna on the probe requires 3.00s probe time to rotate through 1 revolution. How much time is required for 1.00 rev according to an observer on Earth?

asked by britney on May 3, 2012
73. ## astronomy

A geosynchronous satellite is a satellite whose orbital period matches the rotation of the Earth. Calculate the height above the surface of the Earth which a satellite must have in order to be in a geosynchronous orbit. (Please enter your answer in units

asked by Anonymous on October 18, 2015
74. ## chemistryyy

The escape velocity of planet earth is 11.2 km/s. At what temperature would helium atoms be able to escape the earth's gravitational pull? (Note: you're calculating the average speed here, which means roughly 50% of the atoms would escape at any given

asked by tricia on March 7, 2014
75. ## pre-calc

The radius of the earth is approximately 4,000 miles. The acceleration due to gravity is approximately 32 feet per square second. The mass of the earth is approximately 6 × 10^24 kilograms. Calculate the value of G in units of kilograms, meters, and

asked by Math on September 30, 2016
76. ## astronomy

A geosynchronous satellite is a satellite whose orbital period matches the rotation of the Earth. Calculate the height above the surface of the Earth which a satellite must have in order to be in a geosynchronous orbit. (Please enter your answer in units

asked by Tsambikos on October 24, 2015
77. ## Physics

A wheel spins on a horizontal axis, with an angular spped of 140rad/s and with its angular velocity pointing east. Determine the magnitude of the angular velocity after an angular acceleration of 35 rad/s^2, pointing 68 degress west of north, with a time

asked by David on April 23, 2009
78. ## captitals italics abbreviations and numbers

Question 1 Which of the following is the correct name of a region? the Southwest the southwest the South-West the south-east Question 2 Which of the following is correct? esperanto klingon Japanese american sign language Question 3 Which of the following

asked by christopher on April 26, 2010
79. ## Math

Orienteering is a sport that involves navigating your way to a series of checkpoints with the aid of a map and compass. The goal is to find each point on the map as quickly as possible. A typical compass used for orienteering is divided into 360 degree

asked by Cameron on June 7, 2016
80. ## Math(DifferentQuestion,SameDescription)

Orienteering is a sport that involves navigating your way to a series of checkpoints with the aid of a map and compass. The goal is to find each point on the map as quickly as possible. A typical compass used for orienteering is divided into 360 degree

asked by Cameron on June 7, 2016
81. ## Math(PleaseHelp, NewEquation SameDescription)

Orienteering is a sport that involves navigating your way to a series of checkpoints with the aid of a map and compass. The goal is to find each point on the map as quickly as possible. A typical compass used for orienteering is divided into 360 degree

asked by Cameron on June 7, 2016
82. ## Chemisrty

Where can i find drawing of electron dot stuctures for compounds like BR2 and HCN HCN is at the link below. http://dl.clackamas.edu/ch106-01/formulas.htm I couldn't find one for Br2 on line but here is how it will look.   .. .. :Br:Br:

asked by Lance on November 30, 2006
83. ## physics

An object carries a charge of -8.0 uC, while another carries a charge of -2.0 uC. How many electrons must be transferred from the first object to the second so that both objects have the same charge? Qavg = (object 1 + object 2)/2 Qavg= -5uC Object 2- Qavg

asked by Dan on July 24, 2012
84. ## Physics

An object carries a charge of -8.0 ìC, while another carries a charge of -2.0 ìC. How many electrons must be transferred from the first object to the second so that both objects have the same charge? Qavg = (object 1 + object 2)/2 Qavg= -5ìC Object 2-

asked by Dan on July 23, 2012
85. ## Geography

#63. Describe the geography of southern South America and how this geography influences economic activity? my answer: The three nations of southern South America--Uruguay, Paraguay, and Argentina--are very different from the rest of the continent. The

asked by y912f on February 1, 2010
86. ## physics

how do i find the equilibrant force of two forves acting on a point? one is 75N due north and the other is 105N due east.

asked by Anonymous on November 5, 2008
87. ## Math word problem

Jason travels from A for 5 km north and then 7 km due west to B, he then travels bak directly from B to A. Find the total length of his journey

asked by Jazmine on November 28, 2012
88. ## trigonometry

plane flies speed of 185km/hr @ 120deg. it changes speed to 32km/hr @165deg due north. Find the direction and course.

asked by conor on March 2, 2017
89. ## English Writing

People believe in God because... And there is life on earth because... And people who believe in God think that God has put human beings on this earth because... Could you help me? I'm not English speaker so I don't know how can I write continue of these

asked by CC on September 5, 2016
90. ## space

Imagine that all gravity in the Universe was magically turned off (except the gravity of the Earth),and everything stopped moving.Earth's gravity will now begin to pull everything in the Universe slowly toward it. True or False?

asked by eduy on December 1, 2008
91. ## Geometry

What is the magnitude and direction of the PQ−→− with tail and head points P(-6, 0) and Q(2, 4)? Select one: a. 8.9 units, 26.6° north of east b. 8.9 units, 63.4° north of east c. 13.4 units, 0° east

asked by Anonymous on March 6, 2018
92. ## physics

A ship sails 30 kilometers 70 degrees north of east. It then turns 110 degrees to the west, giving it a new heading of 0 degrees north of west. After sailing another 30 kilometers, how far is the boat (in kilometers) from where it started?

asked by Ujala on September 15, 2018
93. ## Physics

Suppose at one point along the Nile River a ferryboat must travel straight across a 1.29-mile stretch from west to east. At this location, the river flows from south to north with a speed of 2.58 m/s. The ferryboat has a motor that can move the boat

asked by Courtney on February 5, 2016
94. ## Physics (Mechanics)

An electron of mass 9.1E-31 kg is released from rest at a distance of 7.1 E-10 m from a fixed electron. The force on the movable electron is given by the function F = 2.3E-28/r^2, where r is the distance between the electrons. Find the maximum velocity (in

asked by andrew on April 12, 2012
95. ## Chemistry

7. Which of the following is true? A. Cesium is the most active group 1 metal, because its valence electron is held more tightly than the others in the same group. B. Group 1 elements are more reactive than the group 2 elements because they have more

asked by Hannah on August 7, 2013
96. ## Physics Problem 6.20

The center of a 1.10 diameter spherical pocket of oil is 1.10 beneath the Earth's surface. Estimate by what percentage directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is

asked by Michael Moskvich on April 4, 2010
97. ## S.S.

Which of the following is an accurate comparison of Adams and Jackson? A. Adams supported efforts to promote the growth of businesses, while Jackson supported efforts to help the ordinary man. B. Jackson supported the idea of high tariffs to increase

asked by ... on November 2, 2017
98. ## Language arts help

"It had been days since he has seen the sun,and he knew that a few more days must pass before that cheerful "orb", due south,would just peep above the skyline and dip immediately from view." Which of the following context clues helps to explain the meaning

asked by Snoopy on August 12, 2015
99. ## Chemistry

Anthracene is a yellow, crystalline solid found in coal tar. Complete this structure for anthracene, C14H10, by adding bonds and hydrogen atoms as necessary. What type of hybrid orbitals are utilized by carbon in anthracene? >>sp3 How many σ bonds and π

asked by Dan on November 22, 2015
100. ## gr 11 physics

as a rocket carrying a space probe acceleraes away from earth the fuel is being used up and the rocket's mass becomes less when the mass of a rocket(and its fuel) is M and the distance of the rocket from eart's centre is 1.5rE, the force of gravitational

asked by mat on November 27, 2009