# Two electrons are placed; one at north pole and other at south pole of earth. Find the force between them. Given diameter of earth= 12800 km.

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1. ## physics

Calculate the force of gravity between Earth (mass = 6.0 * 1024 kg ) and the moon (mass = 7.4 * 1022 kg) the average earth-moon distance is 3.8 * x10^8 m
2. ## 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
3. ## physics

A car is driven 125 km west and then 85 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)? find magnitude in km find direction in degrees. South of west.
4. ## physics

Hi i'm doing that lab were you attach a weight to a tape which is also through a timer that puts marks on the tape at a given time interval ok I'm asked why is gravity different than on Earth? I don't rember the physics answer behind it I remeber Fg =
5. ## science

a boy is going from one place to another he goes 100m north and then 70 m east find the displacement of the boy from his starting point
6. ## maths

a student wals 5km due north from O and then 8km due east find his bearing from O
7. ## Math

P, Q, R, are arranged sticks. P is 10km north of Q. The bearing of R from P is 223, and the bearing of Q from R is 097 find the distance of R from P
8. ## math

A man walks 40 m due north and 50 m due west. Find the distance from the starting point?
9. ## physics

an object displace 6 meters toward the east and 8 meters toward the north find its resultant displacement in graphical
10. ## physics

a person moves 15 km in north direction and then turns towards northeast and moves 10 km.find out the actual displacement ?
11. ## Science

A boy is going from one place to another.He goes 100 m north and then 70 m east . Find the displacement of the boy from his starting point.
12. ## 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
13. ## 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?
14. ## Earth science

TRUE OR FALSE The burning of fossil fuels cause the earth to get warmer by putting carbon dioxide in the atmosphere and the carbon dioxide traps heat. MY GUESS: TRUE Isobars help meteorologists find fronts on weather maps. MY GUESS: FALSE A CLOUD IS A
15. ## 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
16. ## physics

A newly-discovered plant, "Cosmo", has a mass that is 4 times the mass of the Earth. The radius of the Earth is Re. The gravitational field strength at the surface of Cosmo is equal to that at the surface of the Earth if the radius of Cosmo is equal to...
17. ## Physics

In a particular region of Earth's atmosphere, the electric field above Earth's surface has been measured to be 151 N/C downward at an altitude of 280 m and 167 N/C downward at an altitude of 430 m. Calculate the volume charge density of the atmosphere,
18. ## PHYSICS

In a particular region of Earth's atmosphere, the electric field above Earth's surface has been measured to be 151 N/C downward at an altitude of 280 m and 167 N/C downward at an altitude of 430 m. Calculate the volume charge density of the atmosphere,
19. ## science

If Earth is 149.6 million Kilometers from the sun, or 93 million miles away. suppose there was an imaginary road from earth to the sun. If you were in a car traveling 100 km an hour, it would take you 1,490,000 hours or just 170 years to reach the sun. If
20. ## Earth

1. If the Earth were the size of B-B (with a radius of about 0.2 centimete), how big would the Sun be? How big would the Milky Way be? 2. Imagine building a model of the Solar System on your campus. Work out the diameter and spacings of the planets in
21. ## math

A boat is travelling south at a rate of 18 km/h. A man walks across the deck from east to west at a rate of 16 km/h. Find the magnitude and direction of his velocity.
22. ## 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
23. ## Social Studies

What impact do monsoon winds most have on South Asia? A) Monsoon winds carry plenty of rain to India from the Arabian Sea during the wet season from June to September.** B) Monsoon winds carry snow from the north to the Himalayas. C) Monsoon winds carry
24. ## physics

As the earth rotates through one revolution, a person standing on the equator traces out a circular path whose radius is equal to the radius of the earth (6.38 106 m). What is the average speed of this person in meters per second?
25. ## Physics

The surface of the Sun is approximately 5700 K and the temperature of the Earth's surface is about 290 K. What total entropy change occurs when 1000 J of heat of energy is transferred from the Sun to the Earth?
26. ## Geometry

11-1 Lines that Intersect Circles 8. The International Space Station orbits Earth at an altitude of 240 miles. What is the distance from the space station to Earth's horizon to the nearest mile?
27. ## science

The occurrence of earthquakes along plate boundaries indicates that the 1) plates are stationary 2) earth will eventually break apart 3) earth is shrinking 4) coast of California will break off and slide into the ocean 5) plates are moving
28. ## PreCal

On average, the earth in 93 million miles away from the center of the sun. a.) assuming that the earth's orbit is circular, estimate the number of miles our planet travels in one complete revolution around the sun.
29. ## astronomy

the diameter of earth is 7928 miles. what is the diameter in inches? in yards? If the diameter of earth is expressed in 12,756km what is the diameter in meters? in centimeter? give yoiur answers in scientific notation
30. ## Earth/Space Science

Earth's axis tilts at an angle of 23.5 degrees relative to its orbit. Analyze the climate conditions that would exist at the poles and the equator if the axis were parallel to the orbit.
31. ## Science

The rock cycle suggests that A)rocks are always added to Earth's mass. B)rocks are continuously being recycled into different forms. C)rocks disappear from Earth as they go underground. D)rocks always stay in the same form. My answer is A... is that
32. ## math

light from the sun takes approximately 8 minutes to reach earth. If the light travels at a speed of 3 x 10 raised to 8 meters / second, calculate to 3 significant figures the distance from the sun to the earth
33. ## Math

A comet passed by earth in the year 1835 It passes by every 60 years Based on this information in which of the following years can be the comet be expected to Pass by earth A : 2035 B: 2060 C: 2075 D: 2080
34. ## Physics

The intensity of sunlight at the the top of the Earth's atmosphere is about 1350 W/m2. (The intensity at the surface of the Earth is somewhat smaller due to absorption and reflection by the atmosphere.) What is the total power emitted by the Sun?
35. ## 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
36. ## 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
37. ## 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
38. ## 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
39. ## English

I need some help again with these.I have to correct faulty parallelism in the following sentences. I think I have corrected a couple but some I need help on. 1. Activities on Wednesday afternoons include fishing trips, dance lessons, and computers. 2.
40. ## Math

Below are the home states of 17 college professors. Ohio Georgia New Jersey Georgia Nebraska Michigan Ohio Pennsylvania South Carolina New Jersey New Jersey South Carolina Wisconsin Michigan Pennsylvania Ohio Wisconsin i. Make a frequency table using these
41. ## Physics help

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
42. ## 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
43. ## physics

Ships A and B leave port together. For the next two hours, ship A travels at 30.0 in a direction 75.0 west of north while the ship B travels 25.0 east of north at 40.0 . What is the distance between the two ships two hours after they depart? What is the s
44. ## Math

A train leaves a station and travels north at a speed of 75mph. Two hours later, a second train leaves on a parallel track and travels north at 125mph. How far from the station will they meet?
45. ## physics

Find the force of gravity (in newtons) on a spacecraft 15100 km above the earth's surface, if its mass is 400 kg
46. ## physics

Find the angular speed of the Earth as it spins about its axis. Give your result in rad/ses
47. ## astronomy

Find an exact expression for the magnitude of the tidal force applied by Earth to our rock of mass m
48. ## Science

Radius of the earth is 6400km and g is 9.8 m÷s find the value of g produced on a mass of 20 kg at a distance of 10000km from the earths surface ?
49. ## 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
50. ## 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.
51. ## 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?
52. ## Physics (Feilds)

Show that the gravitational potential at the surface of the Earth is -64 MJ kg-1, given the surface gravitational feild strength is 9.8 N kg-1 and the mean radius of the Earth is 6400 km.
53. ## 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.
54. ## 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 ?
55. ## physics

The earth attracts a large ﬂying bug toward its center with a force of 0.10 Newtons. With what force does the bug attract the earth itself?
56. ## 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?
57. ## 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?
58. ## Science

Which of the following statements is true? A. There is more water on Earth now than there was millions of years ago. B. There is less water on Earth now than there was millions of years ago. C. There is no way to tell how much water was on Earth millions
59. ## Science

Which of these statements are true? A. There is more water on Earth now than there was millions of years ago. B. There is less water on the Earth than there was millions of years ago.(MY ANSWER) C. There is no way to tell how much water there was on Earth
60. ## 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
61. ## Polarity and electronegativity (science)

Describe the concept of polarity. How is polrity related to electronegativity? ~Well I think that polarity is how I remember it.."pull" basically due to the tendency for electronegative atoms in a molecule to attract the other electrons in the other atoms
62. ## 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
63. ## Science

Can someone please check my answers? I would greatly appreciate it. Thanks! 1. Which of the following inner planets has virtually no atmosphere? a. Mercury*** b. Venus c. Mars d. Earth 2. Which of the following statements about the inner planets is true?
64. ## 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
65. ## 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
66. ## 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
67. ## Science

A cyclist move 4km in the east diraction then he turn to north and move 3km . Find displacement.
68. ## 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...
69. ## Physics

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

Occasionally a planet will pass directly between Earth and the face of the sun. WHich planets could do this and why? How many complete orbits has Earth make in your lifetime? How many orbits has Mars made in your lifetime? *I have no idea the answer to
71. ## math

A mason's assistant's rate of pay is \$0.75 per cubic foot of earth moved. He moves 220 cubic feet of earth to dig a trench. What is his pay for this job? THE ANSWER IS NOT &330
72. ## College Physics

Sirius is about 9.0 light-years from Earth. To reach the star by spaceship in 10 years (ship time), how fast must you travel? How long would the trip take according to an Earth-based observer? How far is the trip according to you?
73. ## astronomy

Which of the following is not a reason why winter is cold? The sunlight strikes the Earth at a glancing angle to the surface. ]There are fewer daylight hours in the winter. The nights are longer in the winter. The Earth is farther from the Sun in the
74. ## College Chem

The density of the Earth is about 3.5g/cubic centimeters. If the Earth has a radius of 1.126 by 10 (to the seventh power) meters, what is its mass? (hint: volume= 4(pie)r(to the third power)/3; 1 meter=100 centimeters
75. ## college physics

Although astronauts appear weightless, they are not. They only appear weightless because they are in free fall. If a 79 kg astronaut is orbiting Earth with an orbital radius of 5.31×107 m, determine how much the astronaut would weigh. Earth's mass is
76. ## earth

The global-mean surface temperature of the earth is about 288 degrees Kelvin. Use the Stefan-Boltzman law to calculate the radiative flux corresponding to an object with this temperature. [hint: use σT4 with σ = 5.67x10-8 Wm-2K-4 ]
77. ## physics

A satellite moves in a circular orbit around the Earth at a speed of 5661 m/s. (b) Determine the period of the satellite's orbit. the satilites altitude above the surface of earth is 6076312.71m. im using the equation P=2*pi*r/v and am coming up with 1.87
78. ## Science

If the adverage weight of a human body is 75kg and given the mass of the earth is 5976 x 10^21kg, how many people will it take to exceed the weight of the earth? At the present growth of 1.14%, when will the present population of 6.8 x 10^9 grow to that
79. ## astronomy

The Keck telescope on Mauna Kea has an angular resolution on Earth of half an arcsecond. How far away (in meters) could you read ("resolve the letters of") a book with 3 mm square type, using the Keck telescope on Earth?
80. ## astronomy

The Keck telescope on Mauna Kea has an angular resolution on Earth of half an arcsecond. How far away (in meters) could you read ("resolve the letters of") a book with 3 mm square type, using the Keck telescope on Earth?
81. ## college physics

Sirius is about 9.0 light-years from Earth. To reach the star by spaceship in 10 years (ship time), how fast must you travel? How long would the trip take according to an Earth-based observer? How far is the trip according to you?
82. ## colleg physics

Sirius is about 9.0 light-years from Earth. To reach the star by spaceship in 10 years (ship time), how fast must you travel? How long would the trip take according to an Earth-based observer? How far is the trip according to you?
83. ## trig

Since its construction in 1821, Marblehead Lighthouse has stood at the entrance to Sandusky Bay, guiding sailors along Lake Erie’s rocky shores. The 65-foot tower is one of Ohio’s best-known landmarks and the oldest continuously operating lighthouse on
84. ## Maths Exponents

(1) 11×10^-5 .Express it in scientific notation. (2)The distance between sun☉ and earth🌎 is (1.496×10^11)m and the distance between earth 🌎 and moon 🌙 is (3.84×10^8)m.During solar eclipse moon comes in between earth and
85. ## Physical Science

What is the hiker's total displacement? part a of the hike: distance:4km east start time: 9:00 am end time: 9:45 am part b: distance:6 km south start time: 9:45 am end time: 10:45 am part c: distance:4 km west start time:10:45 am end time: 11:15 part d:

Please Check My Answers: 1) How was South Carolina constitution of 1868 different from previous state constitutions? A. Women lost their right to own property. B. Representation was based on population alone. *** C. Countries and districts were organized
87. ## 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
88. ## Science

....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
89. ## 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

Find the acceleration of the following reference frames i)when a reference frame fixed to the surface of the Earth at latitude 37 degree.ii)A reference frame with origin at the center of Earth with one axis always pointing toward the Sun. iii)A reference
91. ## Social Studies

Which of the following is the staple crop of the north China plain A. Barley B. Rice C. Soybeans D. Wheat**** Crops grow well on the north China plain because the Huang river A. Forms a barrier to animals that eat crops B. Changes weather patterns in the
92. ## 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
93. ## Biology

Eutrophication refers to 1. the concentration of a toxic substance in the tissues of organisms. 2. depletion of mineral resources as a result of leaching. 3. the warming of the earth’s surface. 4. the damage to the ozone layer that protects the earth
94. ## Travel and tourism/geography

I need to write a report on the garden route, in South Africa but I can't find the information I need. What is the garden route? Which towns form part of the garden route? Where can I find all the information I need?
95. ## 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
96. ## 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
97. ## physics HELP

A 7450 kg satellite has an elliptical orbit, as in Figure 6.9b. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the
98. ## Physics

A 7300-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the
99. ## Physics

A 7300-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the
100. ## 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