# 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

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.
2. ## science

Amanda is holding a compass and notices that the north pole of the compass points toward the north pole of the Earth. She is confused because she knows from her science classes that the north poles of two magnets will repel each other. How can she explain
3. ## physics..

Angular diameter of sun is 17" when measured from north pole and south pole of earth. Calculate distance of sun from earth if diameter of earth is 12800km. kindly help me to solve this question..
4. ## physics

Suppose that 7.40 g of hydrogen is separated into electrons and protons. Suppose also that the protons are placed at the Earth's north pole and the electrons are placed at the south pole. What is the resulting compressional force on the Earth?
5. ## physics

Angular diameter of sun is 17" when measured from north pole and south pole of earth. Calculate distance of sun from earth if diameter of earth is 12800km.
6. ## physics

Angular diameter of sun is 17" when measured from north pole and south pole of earth. Calculate distance of sun from earth if diameter of earth is 12800km.
7. ## science

Earth titled axis affects the strength of sunlight in different places of earth's surface. If you are in an area that receiving less direct sunlight,where are you located? a) near the equator b) near the north pole c) near the south pole d) near the north
8. ## science

Earth titled axis affects the strength of sunlight in different places of earth's surface. If you are in an area that receiving less direct sunlight,where are you located? a) near the equator b) near the north pole c) near the south pole d) near the north
9. ## Science

The lines of magnetic force generated by the fluid motions of the earth's core result in the formation of the_____. a) North Pole b) north magnetic pole c) magnetic north and south pole d) North and South Poles Just need to know if my answer or right or
10. ## Physics

Planet Earth as a Spring. Assume that the Earth is perfect sphere of mass M=5.98x10^24kg, radius 6,370km, and uniform density. Imagine a long, straight tunnel through the center of the Earth, connecting the North and South poles . A capsule of mass m is
11. ## earth

A man stands at the north pole, his mass is 100 kg. Later he goes and stands at the equator. Compute what force he exerts on the earth when he stands at the: a) north pole, b) equator. Which force is greater and find the difference.
12. ## Science

If you were to look down on Earth from above the North Pole, in which direction would Earth appear to rotate? If you were to look down on Earth from above the North Pole, then earth would appear to rotate in a counter-clockwise direction. More info would
13. ## Physics

I'm not exactly sure how to do this problem The Earth has a radius of 6.37E6 meters. Draw a picture and calculate: - The circumference of the Earth - The time for one rotation of the earth in seconds - The velocity of someone standing on the equator - The
14. ## Physics

I'm not exactly sure how to do this problem The Earth has a radius of 6.37E6 meters. Draw a picture and calculate: - The circumference of the Earth - The time for one rotation of the earth in seconds - The velocity of someone standing on the equator - The
15. ## Earth Science

Can you help me find how many hours are received by these degrees of latitude during the winter (see details)? North Pole = 0 hrs of daylight Equator = 12 hrs of daylight South Pole = 24 hrs of daylight 66.5 degrees north = ? 23.5 degrees north = ? 23.5
16. ## physics

Do electrons go to the north pole or south pole?
17. ## science

magnetic lines flow from what to what? Magnetic lines of force, acutally, are imaginary lines and they are assumed to flow form north pole to south pole outside the magnet and from south pole to north pole inside the magnet.
18. ## physics

the north pole of a compass is attracted to the north magnetic pole of the earth, yet like poles reple. can you resolve this apparent dilemma?
19. ## Physics

The north pole of a compass is attracted to the north magnetic pole of the earth, yet like poles repel. Can you resolve this apparent dilemma?
20. ## Physics

The earth's magnetic field a) is slightly off centre compared to the Earth's rotational axis of rotation b) has its magnetic south pole at the geographic north pole c) attracts the north end of the compass needle to the geographic north pole d) all of the
21. ## Science

Here's my question--- Precession of earth's axis causes- a-axial tilt b-a change in the north pole star c-seasons d-day and night My answer was a- m i rite? Precession of earth's axis caused by the centrifugal force of the Earth's rotation... =) The cause

The earth's magnetic field a) is slightly off centre compared to the Earth's rotational axis of rotation b) has its magnetic south pole at the geographic north pole c) attracts the north end of the compass needle to the geographic north pole d) all of the
23. ## Earth Science

On the surface of the earth, it is approximately 6,200 miles from the equator to the north or south pole. How many miles is it between 2 parallels 1 degree apart?
24. ## science

Which of the following best describes an electric charge? -Positive or negative terminal of a battery -property of electrons, protons, and neutrons -materials that conducts current -has a north pole and a south pole

Which of the following best describes an electric charge? -Positive or negative terminal of a battery -property of electrons, protons, and neutrons -materials that conducts current -has a north pole and a south pole

1. For a bar magnet, the magnetic field lines point a. towards the South pole. b. towards the North pole. c. always towards the magnet. d. always away from the magnet. my answer: a 2. Magnetic field lines a. are straight lines. b. are always circles. c.
27. ## Physics

Which way does the magnetic vector B point in the vicinity of the Earth's North Pole? A. Upward B Downward C. Horizontally D. THere is no magnetic field at the North Pole
28. ## Physics

Find the centripetal accelerations at each of the following points due to the rotation of Earth about its axis. (a) a point on the Equator of Earth ? m/s2 (b) the North Pole ? m/s2
29. ## Physics

A long wire that carries a current is bent into a solenoid with upward current in the front looking. If the observer could "see" the magnetic field inside this arrangement of solenoid from the right side, how would it appear? a) The observer would "see" a

If you hold a bar magnet in each hand and bring your hands together, will the force be attractive or repulsive if the magnets arte held so that A) the tow north poles are brought close together? B) a north pole and a south pole are brought together?
31. ## physics

suppose that all the people of the earth went to the north pole and on a signal all jump straight up. estimate the recoil speed of the earth. the mass of the earth is 6 x 10^24 kg and there are about 6 billion people(6 x 10^9).
32. ## geography

Will you check my answers for me? 1. How many states are part of the contiguous United States? 48 states 2. Is the Tropic of Cancer north or south of the equator? North of the Equator 3. What are the names of the Earth's continents? North America, South
33. ## PHYSICS

please.!PLEASe PLEASE. help me. TRUE or FALSE 1.the north pole of a permanent magnet is attracted to a south pole 2.iron,aluminum, and nickel are all ferromagnetic materials 3.all permanent magnets are surrounded by a magnetic field 4.the direction of a
34. ## physics

help me please. *TRUE or FALSE* 1.the north pole of a permanent magnet is attracted to a south pole 2.iron,aluminum, and nickel are all ferromagnetic materials 3.all permanent magnets are surrounded by a magnetic field 4.the direction of a magnetic field
35. ## Physics

anybody help me to my homework please.!thanks TRUE or FALSE 1.the north pole of a permanent magnet is attracted to a south pole 2.iron,aluminum, and nickel are all ferromagnetic materials 3.all permanent magnets are surrounded by a magnetic field 4.the
36. ## Physics

help me to my homework please.!PLEASe PLEASE. TRUE or FALSE 1.the north pole of a permanent magnet is attracted to a south pole 2.iron,aluminum, and nickel are all ferromagnetic materials 3.all permanent magnets are surrounded by a magnetic field 4.the
37. ## Trig Math

Arc Length Stuff: Have you ever wondered what the circumference of the Earth is? Well, at the Equator, the distance around is about 25000 miles (assuming the Earth is a sphere). What if you wanted to know the distance around at any latitudinal location?
38. ## social studies

Why is there no land in the North Pole??? I really don't know the answer and last week I had it for homework,and I got it wrong. Please answer my question soon because I can't move on in class until I understand why there's no land in the North Pole when
39. ## Physics

A 910kg object is released from rest at an altitude of 1200 km above the north pole of the earth. If we ignore atmospheric friction, with what speed does the object strike the surface of the earth? (the polar radius of the earth is 6357 km)
40. ## Earth

Has the issue of global warming been solved already? I mean, the Kyoto accord will expire in 2012. And are the glaciers of the North & South Pole melting even more?
41. ## Physics

Assuming that the Earth is spherical and recalling that latitudes range from 0° at the Equator to 90° N at the North Pole, how far apart, measured on the Earth's surface, are Copenhagen (55.67° N latitude), and Rome (41.90° N latitude)? The two cities
42. ## Physics

Assuming that the Earth is spherical and recalling that latitudes range from 0° at the Equator to 90° N at the North Pole, how far apart, measured on the Earth's surface, are Copenhagen (55.67° N latitude), and Rome (41.90° N latitude)? The two cities
43. ## geography

Does the prime Meridian pass through the North or South Pole? I put it does not pass through either the North or South Pole. My teacher marked it wrong and said it passes through both. Can you please let me know if I am right and give me a web sight I can
44. ## physics

how does the gravitational force exerted by earth on the sun compare with the gravitational force exerted by sun on the earth? and would you expect tides to be higher at the equator or at the north pole? why?
45. ## Physics

Starting from rest, a 98-kg firefighter slides down a fire pole. The average frictional force everted on him by the pole has a magnitude of 700 N, and his speed at the bottom of the pole is 3.4 m/s. How far did he slide down the pole?
46. ## Physics

Starting from rest, a 98-kg firefighter slides down a fire pole. The average frictional force everted on him by the pole has a magnitude of 720 N, and his speed at the bottom of the pole is 3.8 m/s. How far did he slide down the pole?
47. ## Phys. Sci.

Where is the field of a magnet strongest? A. near the north pole B. near the south pole C. near both poles D. near the middle I think it is C...
48. ## ss

what are latitude and longitude? lines of __________ and lines __________ cross one another. they form a ____________ around the earth. lines of latitude lines of latitude are also called___________ they circle the earth parallel to the_______ they measure
49. ## Math

A light pole of height 15 meter has a lamp hanging at its top . from a distance 12 meter from the base of the pole , a ball is thrown vertically upwards with velocity 5m/sec . find the rate at which the shadow of the ball on the earth moves away from the
50. ## trig

Two people decide to estimate the height of a flagpole. One person positions himself due north of the pole and the other person stands due east of the pole. If the two people are the same distance from the pole and a = 30 feet from each other, find the

5. A magnetic field map shows a. the direction of the magnetic field. b. a few representational field lines. c. relative strength of the magnetic field. d. All of these choices are correct. my answer: d 6. Magnetic field lines a. can cross each other when
52. ## Science

On the surface of the Earth, it is approximately 6,200 miles to the North or South pole. How many miles is it between two parallels 5 degrees apart?
53. ## physics

why one cannot find the north pole of the earth using only a simple compass
54. ## urgent help please i have an exam !!

A light pole of height 15 meter has a lamp hanging at its top . from a distance 12 meter from the base of the pole , a ball is thrown vertically upwards with velocity 5m/sec . find the rate at which the shadow of the ball on the earth moves away from the
55. ## physics

Starting from rest, a 93-kg firefighter slides down a fire pole. The average frictional force everted on him by the pole has a magnitude of 710 N, and his speed at the bottom of the pole is 3.2 m/s. How far did he slide down the pole? What equation do you
56. ## physics

A rocket is fired straight up through the atmosphere from the South Pole, burning out at an altitude of 208 km when traveling at 5.8 km/s. (a) What maximum distance from Earth's surface does it travel before falling back to Earth?
57. ## math

Describe all the points on the Earth’s surface that are exactly 4000 miles from the North Pole. If you need to, use 3960 miles for the radius of the Earth.
58. ## math

Describe all the points on the Earth’s surface that are exactly 4000 miles from the North Pole. If you need to, use 3960 miles for the radius of the Earth.
59. ## math

Describe the points on the earth’s surface that are visible to a viewer who is 100 miles above the North Pole. Would it be half of the surface area of Earth?
60. ## Physics HELP!!!!!!!!

The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration
61. ## Science

Place the North Pole of a bar magnet to the North Pole of another bar magnet. Note the distance at which they repel each other. Then place the North Pole of a bar magnet to the South Pole of another bar magnet and take note of the distance at which they
62. ## physics

A 910kg object is released from rest at an altitude of 1200 km above the north pole of the earth. If we ignore atmospheric friction, with what speed does the object strike the surface of the earth?
63. ## Science

2. Summer occurs on the hemisphere of Earth that is _____. turned away from the sun tilted toward the sun tilted away from the sun turned toward the sun 3. Earth has a(n) _____ and _____ magnetic pole, just as a bar magnet has opposite magnetic poles at
64. ## science

a experiment to prove that a freely suspended or floating magnet always point in the north south direction plz help got my trails!??!?!?! how do i get the ans to this question?????? That doesn't look like a question. It looks like a suggested experiment to
65. ## GEOGRAPHY

How many degrees is the Arctic Circle displaced from the North Pole? I think it's 12 degrees south of the North Pole. I am not sure though. Arc·tic Cir·cle the line of latitude at 66°30'N that marks the boundary of the Arctic. So, what is 90-66°30 ?
66. ## Science

Luis wanted to create a clay model of earth and the sun. To show how Earth rotates, Luis wants to use a toothpick to represent Earth's axis of rotation. Where should Luis place the toothpick? A. Horizontally through Earth in the direction Earth is
67. ## physics

A rocket is fired straight up through the atmosphere from the South Pole, burning out at an altitude of 208 km when traveling at 5.8 km/s. (a) What maximum distance from Earth's surface does it travel before falling back to Earth? I know how to do the
68. ## Science

Luis created a clay model of earth and the sun to show how earth rotates, Luis wants to use a toothpick to represent earths axis of rotation Where should he put the toothpick A - horizontally through earth in the direction earth is traveling B - vertically
69. ## Science

Luis created a clay model of earth and the sun to show how earth rotates, Luis wants to use a toothpick to represent earths axis of rotation Where should he put the toothpick A - horizontally through earth in the direction earth is traveling B - vertically
70. ## Physics - Faucault Pendulum

A Foucault pendulum can be used to demonstrate that earth is rotating. Explain how this is possible. What differences would you notice if you used the pendulum at the North Pole, at Earth's equator, and at altitudes between two points?
71. ## HELP SCIENCE

Luis created a clay model of earth and the sun to show how earth rotates, Luis wants to use a toothpick to represent earths axis of rotation Where should he put the toothpick A - horizontally through earth in the direction earth is traveling B - vertically
72. ## science

an ocena current moving from the equator toward the north pole or the south pole is ? Is the answer Warm in the Northern Hemisphere and Cold in the Southern Hemisphere?
73. ## Science

If you were flying directly south from the north pole and reached 70 degrees north latitude, how many more degrees of latitude would be left to pass over before you reached the south pole?
74. ## To Mrs. Sue

an ocena current moving from the equator toward the north pole or the south pole is ? Is the answer Warm in the Northern Hemisphere and Cold in the Southern Hemisphere?
75. ## Physics

Which of the following statements for magnetism are true? (Give ALL correct answers) A) B does work on a charge only when the charge has a velocity component perpendicular to B. B) B acts only on charges at rest. C) B does work on a charge only when the
76. ## Algebra URGENT! Conic sections

A spacecraft is in a circular orbit 150 kilometers above Earth. Once it attains the velocity needed to escape the Earth's gravity, the spacecraft will follow a parabolic path with the center of Earth as focus. Suppose the spacecraft reaches escape velocity
77. ## Science

At what latitude (on Earth) is the elevation of the South Celestial Pole greatest?
78. ## science

At noon on June 21, the vertical ray of the sun strikes the earth_______. a) in the southern hemisphere (23.5*S) b) at the North Pole (90*N) c) at the South Pole (90*S) d) at the equator (0*) e) in the northern hemisphere (23.5*N) Just need to know if my
79. ## physics

Suppose all the people of the Earth go to the North Pole and, on a signal, all jump straight up. Estimate the recoil speed of the Earth. The mass of the Earth is 6 1024 kg, and there are about 6 billion people (6 109). Take the average mass of a person to
80. ## Physics

Assume the Earth is a perfect sphere of radius 6,400 kilometers. Find the weight of a 75.0 kg person at the North pole. Find the weight of this same person at the equator. (You don't need to use Newton's Law of Gravitation but you do need to analyze the
81. ## Physics

A 30-N non-uniform pole, 5m long, was used to carry a load of 400 N by two men. The load was hung at the middle of the pole. Find the center of gravity of the pole if the force exerted by each man on each end were 220 N and 210 N respectively.
82. ## math

a flagpole is 25 feet tall. a truck runs into the pole and bends it at the very bottom of the pole but the rest of the pole remains straight. after the accident we measure the angle of elevation to the top of the pole from a point 30 feet from the base of
83. ## maths

pole A is twice as long as pole B. pole C is 260 cm shorter than pole A. pole C is 1040 cm long, what is the total length of the three poles
84. ## physics

the magnitude of earths magnetic field at the magnetic north pole is 61/1000000.(a) determine the magnitude of the dipole moment of the earth (b)suppose an additional field due to the current in wire around the equator is used to make the net field at the
85. ## Nautical Studies

I am aware a magnetic compass is useless for navigational purposes in the region of the magnetic north pole. How far away from the magnetic north pole do you need to be before the magnetic compass will function effectively? Depending on the answer does
86. ## Physics

A bird flies from the South Pole to the North Pole. Part of the journey is 1000 miles that takes 2 weeks. What is the bird’s velocity in that time? Show work for credit and include final units.
87. ## maths

from a point P on a level ground and directly west of a pole,the angle of elevation from the top of the pole is 045 and from point Q east of the pole the angle of elevation of the pole the angle of elevation of the top of the pole is 068 if /PQ/ is
88. ## Math: Trig

to determine the height of a pole across a road, Justin takes two measurments. he stands at Point A directly across from the bass of the pole and determines that the angle of elevation to the top of the pole is 15.3 degrees. he then walks 30m parallel to
89. ## Math

Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same
90. ## physics

Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same
91. ## PHYSICS 2

A horizontal wire that runs east-west carries a steady current to the east. A C-shaped magnet is placed so that the wire runs between the poles, with the north pole above the wire and the south pole below. What direction of the magnetic force on the wire
92. ## math

a boat travel for 4hr from pole a to pole b.then it travel for 3hr from pole b back to pole a.the distance between the two poles was 40km a.find the total time taken for the whole journey b.find the average speed for the whole journey
93. ## Physics

A 25.0 m tall hollow aluminum flagpole is equivalent in strength to a solid cylinder of aluminum 3.50 cm in diameter. A strong wind bends the pole much as a horizontal force of 900 N exerted at the top would. How far to the side does the top of the pole
94. ## earth science

Describe the change in duration of insolation from the Equator to the North Pole A) In the winter b) In the summer c) on the Equinox
95. ## earth science

Describe the change in duration of insolation from the Equator to the North Pole A) In the winter b) In the summer c) on the Equinox
96. ## GYRO COMPASS

A gyro compass is affected by 2 errors. Speed error and latitude error. I have no idea why this should be. Can anyone offer an explanation. Thank you, Mike. Since this is not my area of expertise, I searched Google under the key words "gyro compass error
97. ## trigonometry

at a point 27 m from the front of a pole, the angle of elevation of the top of the pole is 53. find the height of the pole
98. ## MAGNET

1. The figure shows a conducting loop of wire in the field of a magnet which is behind the loop. The South Pole of the magnet is facing the loop as shown. The North Pole is further behind and is not shown in the figure. I now lift the loop straight out of
99. ## physics

A uniform rigid pole of length L and mass M is to be supported from a vertical wall in a horizontal position, as shown in the figure. The pole is not attached directly to the wall, so the coefficient of static friction, μs, between the wall and the
100. ## Physics

A uniform rigid pole of length L and mass M is to be supported from a vertical wall in a horizontal position, as shown in the figure. The pole is not attached directly to the wall, so the coefficient of static friction, μs,between the wall and the