# 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. ## Math

A guy wire 11.2m long. It supports a vertical power pole. The wire is fastened to the ground 9.87m from the base of a 5.3m tall pole. Calculate the measure of the guy wire and the ground
2. ## math REALLY need help please

A guy wire is 11.2m long. It supports a vertical power pole. The wire is fastened to the ground 9.87m from the base of a 5.3m tall pole. Calculate the measure of the guy wire and the ground
3. ## math

A tetherball is attached to the end of a 3-meter rope. The rope is attached to a pole thatis 5 cm in diameter. Estimate the greatest number of timees the rope could rap around the pole. Use 3 for pi(3.14) to make your estimate.
4. ## geometry

a 20 meter long cable is used to support a telephone pole holding it perpendicular to the ground. If the cable forms a 60grados angle with the ground how long mhigh up the pole should the cable be attached?
5. ## Physics

A tetherball apparatus consists of a ball attached to a 2.10 m rope that is attached in turn to the top of a 3.10 m tall pole. The ball is struck such that it moves horizontally around the pole. Immediately after the ball is struck, it moves at 5.57 m/s,
6. ## algebra

A flag pole casts a shadow of 27 feet , while a boy 5 feet tall casts a shadow of 3 feet find the height of the flag pole
7. ## Maths

A 10-foot tall basketball hoop is 4 feet shorter than twice the height of a flag pole.What is the height in feet of the flag pole
8. ## science

A bird sits on a pole and watches waves. The wave crests are 1.0 meter apart. If one wave crest passes the pole each second, what is the speed of the wave? . What is the period of the wave? . What is the frequency of the wave? . If the waves change so that
9. ## georgia state history

Which of the following was an advantage of the south at the beginning of the civil war A. The south had agriculture products to provide food for the army B. The south had many factories that created superior machinery C. The south had a more advanced fleet
10. ## calculus

A straight road makes an angle, A of 12 degrees. When the angle of elevation, B, of the sun is 55 degrees, a vertical pole beside the road casts a shadow 7 feet long parallel to the road. Approximate the length of the pole. Round to tow decimal places.
11. ## Chemistry

how do you identify an anode and cathode by direct observation in an electochemical battery when you don't have a voltmeter and the chemicals are no known. I look on the battery for a + and - sign. In a battery, the + pole is the cathode and the - pole is
12. ## Math

6. Tikka made bamboo fishing poles for her sister and herself. She used\frac{2}{3} 2 3 of a 10-foot stick of bamboo for her pole and the rest for her sister's. How long is her sister's fishing pole?
13. ## Geometery

A, B, C and D are on horizontal level ground and CT is vertical pole. B is 35 m due east of C, A is 60 m South of C and D is 60 m West of A. Calculate the angle of elevation of T from N. I m really suck...plz help
14. ## physics

an 88.kg fireman slides 5.9 meters down a fire pole. He holds the pole, which exerts a 520N steady resistive force on the fireman. At the bottom he slows down to a stop in 0.43m by bending his knees. determine the acceleration while stopping and the time
15. ## maths

A boy 1.2m tall stands 6m away from the foot of a vertical land pole 4.2m long. If the land is at the top of the pole,(a)represent this information in a diagram (b)calculate the (I)length of the shadow of the boy cast by the land (ii)angle of elevation of
16. ## maths

Shyam wishes to determine the distance between two objects A and B but there is an obstacle between the two objects which prevents him from making a direct measurement. He design an ingenious way to overcome this difficulties. First, he fixes a pole at a
17. ## physics 211

A deep-sea fisherman struggles to bring in a big salmon (see figure below). Find the force each hand must exert on the pole if the tension in the line is 159 N. Neglect the weight of the pole and assume that the force exerted by the left hand is directed
18. ## Trig

When the angle of elevation of the sun is 61°​, a telephone pole that is tilted at an angle of 8° directly away from the sun casts a shadow 20 feet long. Determine the length of the pole to the nearest foot. I'm stuck halfway through this problem, I
19. ## physics

A farm boy studying physics believes that he can fit a 15.0 m long pole into a 12.0 m long barn if he runs fast enough (carrying a pole). Can he do it? Explain in detail.How does this fit with the idea that when he is running the barn looks even shorter to
20. ## 7th grade math pygorean theroem ms.sue correct

4. A wire is stretched from the top of a 26-foot pole to a point on the ground that is 15 feet from the bottom of the pole. Approximately how long is the wire in feet? (1 point) 16 21 30 37 4.30 is it correct?
21. ## physics

In the figure, two skaters, each of mass 58.0 kg, approach each other along parallel paths separated by 2.79 m. They have opposite velocities of 1.50 m/s each. One skater carries one end of a long pole of negligible mass, and the other skater grabs the
22. ## MATH WORD PROBLEM

MEASUREMENT: A woman is 5 ft tall and her shadow is 4ft long a nearby tree has a shadow 30 ft long. how tall is the tree? my answer i got was; 37.5 ft is that right? a man is standing near a totem pole. the man is 74 in tall. his shadow is 4ft long. the
23. ## Mathematics

The angle of elevation of the top of a flagpole from a point on the level ground is 30degrees. From another point on the ground 20m, nearer the pole the angle of elevation is 60degrees. Calculate the height of the pole?
24. ## Math

If a pole cast a 20 foot shadow and a tree that's 8 foot cast a 5ft shadow how tall is the pole also tell me how you solved it
25. ## Physics

two skaters, each of mass 55 kg, approach each other along parallel paths separated by 3.8 m. They have opposite velocities of 1.9 m/s each. One skater carries one end of a long pole with negligible mass, and the second skater grabs the other end of it as
26. ## physics

At the equator, the earth’s field is essentially horizontal; near the north pole, it is nearly vertical. In between, the angle varies. As you move farther north, the dip angle, the angle of the earth’s field below horizontal, steadily increases. Green
27. ## physics

the number on the left is the displacement, on the right is the vector. The person travelling i order of the numbers ....not sure how to explain this because there are no instructions only a shart with the titles of the categories Steps, Displacement,
28. ## Physics

A 90 kg halfback runs north and is tackled by a 120 kg opponent running south at 4 m/s. The collision is perfectly inelastic. Just after the tackle, both players move at a velocity of 2 m/s north. Calculate the velocity of the 90 kg player just before the
29. ## Math

Two poles are 20 feet tall and 30 feet tall, respectively. If they are 30 feet apart, how far is it from the top of one pole to the top of the other pole? Round your answer to the nearest tenth of a foot.
30. ## geometry

Tanya see a bird on top of a light pole that is 27 feet tall. If she is 50 feet from the light pole, approximately how far is she from the bird? Is the correct answer 57 feet? Thank you
31. ## math

The center pole of a tent is 8 feet long. the side of the tent is 12 feet long. If a right angle is formed where the center pole meets the ground, what is the measure of angle a.(there is a pic, the 8ft line is the center pole going down, this forms the
32. ## Math (FST)

1. Give exact value of tan(theta) if cos(theta)=-2/7 and pi/2<theta<pi. 2. Find the domain, range, period, and phase shift of y=3sin(2x-4)+1 3. The city of cape town, South America, has latitude 33.92 degrees south and longitude 18.37 degrees east.

Decide whether each of the following is a characteristic of the North-Puritanism,South-Gentleman planters or both the north and the south. Came to America to find freedom to worship and the promised land - The North-Puritanism; The South-Gentleman
34. ## Calculus

Can someone show how to solve this problem Two vertical towers of heights 60 ft and 80 ft stand on level ground, with their bases 100 ft apart. A cable that is stretched from the top of one pole to some point on the ground between the poles, and then to
35. ## math

suppose that you are a power company who must provide power to a lighthouse on an island 1 mile off shore. the nearest pole to run the line from is 2 miles up the shore from the line straight out to the lighthouse. if the line costs \$1000/mile on land and
36. ## GEOMETRY

1.) Estimate the value of √ 52 to the nearest whole number: A. 9 B. 8 C. 7*** D. 6 2.) Identify all sets to which the number 3.1214122144...belongs A. rational number B. irrational number*** C. integer, rational number D. whole number, integer,
37. ## Science

When the North Pole is tilted toward the Sun, which hemisphere will have the summer season? Northern Hemisphere - June
38. ## algebra

A 24 meters pole is held by a three guy wire into vertical position. Two of the guy wires are of equal length. The third wire is 5 meters longer than the other two and is attached to the ground 11 meters farther from the foot of the pole than the two equal
39. ## math

A flagpole at right angle to the horizontal is located on a slope that makes an angle of 12∘ with the horizontal. The pole's shadow is 16 meters long and points directly down the slope. The angle of elevation from the tip of the shadow to the sun is
40. ## geometry

A person 6 ft tall is standing near a treet light so that he is 4/10 of the distance from the pole to the tip of his shadow.How high above the ground is the light bulb? If the persons head is exactly 5ft from the light bulb how far is the person from the
41. ## Physics

A bar magnet with its south pole down passes through a conducting ring. As viewed from above the ring, in which direction does the current flow?
42. ## writing

Write an national anthem for the North Pole.Use a familiar tune from a song or create an orginal tune.
43. ## algebra

GUY WIRE. How long is a guy wire reaching from the top of a 15ft. pole to a point on the ground 10 feet from the pole? exact length in feet. length in three decimal places in feet.
44. ## Algebra

A tree is 38.5 feet tall casts a shadow that is 9 feet 4 inches long.A utility pole beside the tree casts a shadow that is sixty-four inches long.Find the height of the utility pole. Show work
45. ## Physics

The Earth has an electric field with magnitude roughly 100 N/C at its surface. A) Assuming there is a point charge at the earth's center creating this field, how much charge does the earth posses? Treat the earth as a sphere of radius 6.37 * 10^6 m. B)As
46. ## science

Why don't perfect convection currents reach the North Pole from the equator? Land masses and other currents interfere.
47. ## AP Physics

A light string that is attached to a large block of mass 4m passes over a pulley with negligible rotational inertia and is wrapped around a vertical pole of radius r. The system is released from rest, and as the block descends the string unwinds and the
48. ## Physics

A 55.0 kg ice skater is moving at 4.04 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.795 m around the pole. (a) Determine the force exerted by the horizontal rope on her
49. ## Earth Science

How many hours of daylight occur at the following locations on the specified dates? March 22 ---------------- 40 degrees north 0 degrees 90 degrees south December 22 ---------------- 40 degrees north 0 degrees 90 degrees south
50. ## Physics

A 54.9-kg ice skater is moving at 4.09 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.803 m around the pole. (a) Determine the force exerted by the horizontal rope on her
51. ## PHYSICS-HELP

The metre was originally defined as a fraction of the distance from the North Pole to the equator. What problems would this definition of the metre create for people?
52. ## checking world geo

I don't know the answer for.... Q1)which are closer to the equator, the nomads of the sahara or coffee growers of colombia?__________________. Ones i do know the answers for but need to make sure.... Q2)What mountain range is located between the black and

a 4 foot post that is 8 feet from a flag pole is casting a shadow whose length is 5 feet? write a proportion that can be used to approximate the height H, of the flag pole in feet. solve the proportion to determine the approximate value of H,in feet?
54. ## math

Am I missing something here. They way I read this is that the answer is already given 9.5m. or are they after the angle of the ground to guy wire? The guy wire is 13.4m long. It supports a vertical power pole. The wire is fastened to the ground 9,5m from
55. ## Analytic Geometry(Math)

a person 6 ft. tall s standing near a street light so that he is 4/10 of the distance from the pole to the tip of his shadow. How high above the ground is the light bulb? if the person's head is exactly 5ft from the light bulb. how far is the person from
56. ## i really need help and i dont ask alot so plzz

I NEED HELP WITH THIS its a TEST: 1. Which of Earth’s spheres contains most of its mass? (1 point) atmosphere hydrosphere geosphere biosphere 2. Erosion and weathering are examples of which types of forces? (1 point) constructive forces destructive
57. ## Physics

Suppose that the magnetic field o fthe Earth were due to a single current moving in a circle of radius 2988 km through the earth’s molten core. The strength of the Earth’s magnetic field on the surface near a magnetic pole is about 6.00E-5 T. About how
58. ## physics

What is the change in velocity if a car traveling 30{m}/{s} north slows to 20{m}/{s} north? A. 20{m}/{s} north B. 10{m}/{s} north C. 30{m}/{s} south D. 10 {m}/{s} south
59. ## Science-Physics

The metre was originally defined as a fraction of the distance from the North Pole to the equator. What problems would this definition of the metre create for people?
60. ## Science-PHYSICS

The metre was originally defined as a fraction of the distance from the North Pole to the equator. What problems would this definition of the metre create for people?
61. ## Physics

1. You are looking into a current carrying solenoid and notice that the compass needle indicates that you are at the south end of the magnetic field. What is the direction of the current in the coil and how do you know? Would it be clockwise because
62. ## Social Studies

There are 8 languages on he peace pole that all state "may pece prevail on earth" what languages are used? I need help on this plz help thank u
63. ## Geography

Please can you tell me whether the north italian plain or the south of italy would have a) hydro-electric power available b) few natural resources. I cannot find the answers to them. One answer goes on north and one on south. Please help.
64. ## math

Bill sees that the shadow of a flag pole is about four times as long as his shadow. If Bill if about 5 1/2 feet tall, about how tall is the flag pole?
65. ## math

A 12ft. pole casts a shadow of 16ft. What is the distance between the end of the shadow and the top of the pole? A^2 + 12ft^2 = 16^2 A^2 + 144 = 256 A^2 + 0 = 256 - 144 A^2 = 112 A^2 = SQRT of 112 or 10.58ft.
66. ## Trig

A 60-foot flagpole stands on top of a building. From a point on the ground the angle of elevation to the top of the pole is 45 degrees and the angle of elevation to the bottom of the pole is 42 degrees. How high is the building?
67. ## physics

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 x 106 m, determine the centripetal acceleration of a
68. ## physics??

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 x 106 m, determine the centripetal acceleration of a
69. ## Pre-Calculus-Trig

A straight road slopes at an angle of 10 degrees with the horizontal. When the angle of elevation of the sun (from horizontal) is 62.5 degrees, a telephone pole at the side of the road casts a 15 foot shadow downhill, parallel to the road. How high is the
70. ## Physics

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
71. ## Physics

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
72. ## physics

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 x 106 m, determine the speed and centripetal
73. ## Physics

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

Tanesha needs to measure the height of a flagpole. She is 5'9" tall. She finds that if she stands 12 ft from the base of a flagpole, the top of her head touches the guy wire holding the flagpole up. The guy wire is anchored 15 ft from the base of the pole.
75. ## Math

Q. In a decrement timed drill, at the sound of a fire alarm it took a fire fighter 9.5 seconds to reach the Fire pole, 3.2 seconds to slide down the pole, 13.6 to put on protective gear, 5.7 to climb aboard the truck. How long did it take the fighter to be
76. ## math

A 5-foot tall women is standing near a flag pole which casts a shadow of 21 feet on level ground. If the women’s shadow is 3 feet long, how tall is the flag pole?
77. ## phsics

a car moving with an initial velocity of 60 m/s south has a constant acceleration of 10 m/s^2 north. After 12 seconds its velocity will be: A) 60 m/s south B)60 m/s north C) 40 m/s north D) 40 m/s south
78. ## Physics circular motion

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 x 106 m, determine the centripetal acceleration of a
79. ## PHYSICS HELP!

1. A 125-gram projectile strikes a 1.45 kg block that's attached to a massless vertical pole & becomes embedded in the block causing the bullet & block to swing upward. The overall length of the pole & the block combined is 1.1m. The bullet & block at the
80. ## SCIENCE - HELP PLEASE!

Some materials are magnetic because... A. their protons are magnetic B. their atoms behave like magnets C. they have magnetic fields around them D. they have a north pole (I think it's C.)
81. ## Chemistry AP

I'm using Zumdahl 7th Edition Chemistry Book and I'm having trouble with some practice problems in the first chapter. Here are a few: 87: Sterling silver is a solid solution of silver and copper. If a piece of a sterling silver necklace has a mass of 105.0
82. ## Climate Change

State two reasons why you would expect the climate in Nigeria(near the equator)to be warmer than the climate in Greenland(closer to the North Pole)
83. ## LA

How did the Civil War affect the Northern and Southern economies? A;The North experienced more severe inflation than the South. B;Overall the South fared much worse economically than the North. C;The South experienced a boom in manufacturing. D;The North's
84. ## Math

the conductor looked at his pocket watch to see what time the train would be leaving. it read 8:37 pm. if it takes the polar express 3 hours and 15 minutes to get to the north pole, what time will it be when it arrives?
85. ## history

After the Revolution, the practice of a.enslaving African Americans was b.eliminated in the North. [c].restricted in the North and the South. d.encouraged in the North. abolished in the South
86. ## Geography

28. What information would be the most helpful in drawing inferences about hwy certain countries in Southeast Asia have a large number of Muslims? a. knowing what countries in the region were colonized by France b. knowing what countries were ruled by
87. ## Social Studies

My daughter is in the 5th grade and has to prepare a totem pole based on her family's history...I know how to make a totem pole, but how do you make one based on your family history?
88. ## history

Rank the top five factors you think contributed to the outcome of the Civil War. This my question. 1. 1.The weather we lost more men by the harsh weather. 2.The North had more access to weapons then the south. 3.The south was out number, the north had more
89. ## Earth Science

During June 21-22, determine the length of daylight at the following latitudes. Any help is greatly appreciated. latitudes --------------- 70 degrees north 40 degrees south 40 degrees north 90 degrees south 0 degrees
90. ## social studies

is arizona closer to the equator or to north pole? What is the latitude? If it is greater than 45 degrees N, it is closer to the NPole. http://www.netstate.com/states/geography/az_geography.htm Yes it is.
91. ## Social Studies

Which occurrence is not characteristic of global warming? a. melting mountain glaciers in the south pole b. stabilization in the sea level due to warm weather*** c. greater amounts of precipitation d. loss of habitat for certain species
92. ## physics

In a farm yard, a 20.0-kg light is suspended from a light beam on the end of a tall pole. The beam is supported by an arm that attaches to the beam at the suspension point of the light, as shown in the diagram below. The arm makes an angle of 50.0
93. ## math

A telephone pole casts a shadow 16 feet long at the same time that a man 6 feet tall casts a shadow of 2.4 feet. How tall is the pole?
94. ## Physics

Maya follows a maze by going: 3 m north, 2 m west, 1 m south, 1 m west, 2 m north, 6 m east, and 2 m north. What is her final displacement in a north/south direction.
95. ## Physics

Horizontal electric power lines supported by vertical poles can carry large currents. Assume that Earth’s magnetic field runs parallel to the surface of the ground from south to north with a magnitude of 0.50××10^-4 Tesla and that the supporting poles
96. ## Physics..Urgent!!!

In the sport of pole vaulting, the jumper's point of mass concentration, called the centre of mass, must clear the pole. Assume that a 59 kg jumper must raise the centre of mass from 1.1 m off the ground to 4.6 m off the ground. What is the jumper's
97. ## geography

Can you check my answers please? 1. Describe North Dakota's geographic borders using cardinal directions? To the North is Saskatchewan and Manitoba, Canada. To the East, it is Minnesota. To the South, it is South Dakota. To the West, it is Montana 2.Which
98. ## Physics

The force on a wire is a maximum of 6.5E-2 N when placed between the pole faces of a magnet. The current flows horizontally to the right and the magnetic field is vertical. The wire is observed to "jump" toward the observer when the current is turned on.
99. ## calc

A light is at the top of a pole 80ft high. A ball is dropped at the same height from a point 20ft from the light. If the ball falls according to 2=16t^2, how fast is the shadow of the ball moving along the ground 1 second later? please help!!! Let x be the
100. ## Physics

A bar magnet with its south pole down passes through a conducting ring. As viewed from above the ring, in which direction does the current flow? (a) cw (b) ccw (c) no current flows