# 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

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
2. ## 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
3. ## 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
4. ## physics7

A 81.0-kg (179 lb) boxer has his first match in the Canal Zone (g = 9.782 m/s2) and his second match at the North Pole (g = 9.832 m/s2). (a) What is his mass in the Canal Zone? (b) What is his weight in the Canal Zone? (c) What is his mass at the North
5. ## 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
6. ## trig

A pole is braced with a wire from the top of a pole to the ground. The wire is 100 feet long and makes an angle of 40° with the ground. Find the height of the pole.
7. ## Math

An 8 meters bamboo pole is leaning against a coconut tree. The foot of the pole is 3 meters from the base of the tree. What angle does the pole make with the tree if the pole reaches up to the top of the tree? HELP PLEASE!
8. ## math

a 5ft pole is situated on top of a building. a 25ft pole extends from the top of the pole to a point on the ground creating a 26 degree angle. find the height of the building. please help me work this problem
9. ## social studies

where is the north and south pole on the world map?
10. ## Algebra

A 42 ft guy wire reaches from the top of a pole to a point on the ground 15 ft. from the pole. Find how high up the pole does the guy wire reach?
11. ## algebra

Jenny is 5ft 2in. tall. To find the height of a light pole, she measured her shadow and the pole shadow What is the height of the pole?
12. ## Thinking Mathematically

solve A Flag Pole Has A Height Of 16 Yards. It Will Be Supported By Three Cables, Each Of Which Is Attached To The Flagpole At A Point 4 Yards Below The Top Of The Pole And Attached To The Ground At A Pole. Find the total number of feet of cable that will
13. ## Math

1. To find the height of a pole, a surveyor moves 120 feet away from the base of the pole and then, with a transit 8 feet tall, measure the angle of elevation to the top of the pole to be 36*. to the nearest foot, what is the height of the pole? A) 87
14. ## Math! Helppppp

Two poles are place 15 feet apart. One pole is 8 ft high and the other pole is 16 ft high. The top of each pole is attached to the base of the other by cable which run in a straight line. -Find the slopes of the lines defined by the two ropes. -How high
15. ## 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
16. ## Math

At the South Pole there is no sunshine for 182 days every year, and at the North pole the same applies for 176 days per year. What total would you have if you were to combine these two figures. A 359 days a year B 358 days a year C 357 days a year D 335
17. ## Science

Which of the following is true about the magnetic field diagram below. Its shows 3 Arrows on top pointing to B A B 3 Arrows on bottom pointing to B A A is the south pole and B is the north pole B A is the north pole and B is the south pole C A and B are
18. ## Science

Which of the following is true about the magnetic field diagram below. Its shows 3 Arrows on top pointing to B A B 3 Arrows on bottom pointing to B A A is the south pole and B is the north pole B A is the north pole and B is the south pole C A and B are
19. ## Physics

Two speakers are driven by the same oscillator with frequency of 140 Hz. They are located 4.00 m apart on a vertical pole. A man walks straight toward the lower speaker in a direction perpendicular to the pole. He will hear the minimum in sound intensity
20. ## 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).
21. ## Science- 3rd request plzzz

Which of the following is true about the magnetic field diagram below. Its shows 3 Arrows on top pointing to B A B 3 Arrows on bottom pointing to B A A is the south pole and B is the north pole B A is the north pole and B is the south pole C A and B are
22. ## math

A street light is at the top of a 15 ft pole. A 5 ft tall girl walks along a straight path away from the pole with a speed of 5 ft/sec. (A)At what rate is the tip of her shadow moving away from the light (ie. away from the top of the pole) when the girl is
23. ## Maths

A flay pole is placed at the top of a tower.the angle of elevation of the bottom and top of the flay pole from a point on the ground 10M away and 40 degrees and 50degrees respectively.find the length of the flay pole.
24. ## geometry

a 26- foot wire reaches from the top of a pole to a stake in the ground. if the distance from the base of the pole to the stake is 10 feet, how high is the pole?
25. ## Trig

a 12-ft-long guy wire is attached to a telephone pole 10.5 ft from the too of the pole. If the water forms a 52 degree angle with the ground, how high is the telephone pole?
26. ## Calculus

A pole 12 meters long is leaning against a vertical wall of a building. if the foot of the pole is being pulled away from the wall at the rate of 2 meter per minute, how fast is the top of the pole sliding down the wall at the instant when the foot of the
27. ## physics

A 2.70 m long pole is balanced vertically on its tip. What will be the speed (in meters/second) of the tip of the pole just before it hits the ground? (Assume the lower end of the pole does not slip.)
28. ## geometry

A wire is attached to the top of a flag pole. The wire meets the ground 4 meters from the flag pole. The wire makes a 45 degree angle with the flag pole. How tall is the flag pole?
29. ## Calculus

A street light is at the top of a 17 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 6 ft/sec. How fast is the tip of her shadow moving when she is 50 ft from the base of the pole.
30. ## Trigonometry

A vertical pole 35m high, standing on sloping ground is braced by a wire which extends from the top of the pole to a point on the ground 25 m from the foot of the pole. If the pole subtends an angle of 30 degrees at the point where the wire reaches the
31. ## Algebra

Scott set up a volleyball net in his backyard. one of the poles, which forms a right angle with the ground, is 6 feet high. To secure the pole, he attached a rope from the top of the pole to a stake 8 feet from the bottom of the pole. To the nearest tenth
32. ## Math

A street light is mounted at the top of a 15-ft-tall pole. A man 6 ft tall walks away from the pole with a speed of 7 ft/s along a straight path. How fast is the tip of his shadow moving when he is 45 ft from the pole?
33. ## calculus

A street light is mounted at the top of a 15-ft-tall pole. A man 6 ft tall walks away from the pole with a speed of 7 ft/s along a straight path. How fast is the tip of his shadow moving when he is 45 ft from the pole? ft/s
34. ## Calculus

A street light is at the top of a 17 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 6 ft/sec along a straight path. How fast is her shadow lengthening when she is 30 ft from the base of the pole?
35. ## college

a guy wire 27 feet long runs from the top of the pole to a spot on the ground. I f the height of the pole is 6 feet longer than the from the base of the pole to the spot where the guy wire is anchored, how tall is the pole?
36. ## algebra 1

A telephone pole stands exactly in the middle between two houses. The houses are 72 feet apart. If a wire is stretched from the top of the pole to the base of the house, its length is 39 feet. A. What is the distance of the pole from each house? 72/2= 36
37. ## Math

A woman wants to measure the height of a nearby tower. She places a pole in the shadow of the tower so that the shadow of the pole is exactly covered by the shadow of the tower. The distance between the pole and the tower is , and the pole casts a shadow
38. ## 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?
39. ## calculus

A street light is at the top of a 17 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 6 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 40 ft from the base of the pole?
40. ## calculus

A street light is at the top of a 20 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 6 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 35 ft from the base of the pole?
41. ## calculus

A street light is at the top of a 16 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 4 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 40 ft from the base of the pole?
42. ## Calculus 1

A street light is at the top of a 19 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 4 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 50 ft from the base of the pole?
43. ## calculus

A street light is at the top of a 16 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 4 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 30 ft from the base of the pole?
44. ## calculus

A street light is at the top of a 15 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 4 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 30 ft from the base of the pole
45. ## calculus

A street light is mounted at the top of a 6-meter-tall pole. A man 2 m tall walks away from the pole with a speed of 1.4 m/s along a straight path. How fast is the tip of his shadow moving when he is 16 m from the pole?
46. ## math

A street light is at the top of a 18 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 8 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 35 ft from the base of the pole?
47. ## Calculus

A street light is at the top of a 15 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 5 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 50 ft from the base of the pole?
48. ## calculus

A street light is at the top of a 13 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 7 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 35 ft from the base of the pole?
49. ## Science

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

From the top of a building 85ft high, the angle of elevation of the top of a vertical pole is 11 degree 6'. At the bottom of the building the angle of elevation of the top of the pole is 26 degree 7'. Find the height of the pole and the distance of the
51. ## physics

help with the websites that discuss the mechanism followed during the manufacturing of a bar magnet such that it has a north and south pole
52. ## Physics

a uniform pole 20ft long ang weighing 50lbs is used to carry a load of 180lbs.Two men,one supporting twice as much as the other support the pole to keep it in a horizontal position.How far from the center of the pole should the load be hung.?
53. ## calculus

A street light is at the top of a 19 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 5 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 40 ft from the base of the pole? Rate =
54. ## story problem

Two wires stretch from a pole to two points on the ground which are 25 feet apart. The first wire is to the left of the pole and forms a 30° angle with the ground. The second wire is to the right of the pole and forms a 60° angle with the ground. How
55. ## 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)
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. ## SLCS

Paul and Juston are carrying a sack or rice weighing 6.02x10^2 N on a pole between them. If the pole is 2.0 m long and the load is .50m away from Juston,what force should each boy exert to make it equilibrium. Neclect the weight of the pole.
58. ## calc related rates

A street light is at the top of a 18 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 6 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 45 ft from the base of the pole?
59. ## physics

Bubba decides to go fishing one day. He gets into his boat and starts out from the boat ramp to find the perfect fishing spot in the lake. First, he goes 121 meters in a direction of 20° west of north. Then, he goes 104 meters in a direction of
60. ## 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
61. ## trig

Wires are attached to a pole to make it more secure. The diagram shows one of those wires having a length of 220 feet. The angle of elevation from the ground to the top of the pole is 36. What is the height of the pole? A. 178.0 ft B. 374.3 ft C. 159.8 ft
62. ## science

why does when we walk 10km to the south, then another 10km to the east, and another 10km to the south, we finally reach the initial point of our journey in the North Pole?
63. ## trig

a vertical pole 35 feet high, standing on sloping ground, is braced by a wire which extends from the top of the pole to a point on the ground 25 feet from the foot of the pole. If the pole subtends an angle of 30 degree at the point where the wire reaches
64. ## 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.
65. ## 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.
66. ## Physics

An 83-kg fireman slides down a fire pole. He holds the pole, which exerts 500-N steady resistive force on the fireman. At the bottom he slows to a stop in 0.49 m by bending his knees. Determine the acceleration of the fireman while sliding down the pole.
67. ## 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
68. ## 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?
69. ## Physics

A(n) 95.7 kg boxer has his first match in the Canal Zone with gravitational acceler- ation 9.782 m/s2 and his second match at the North Pole with gravitational accelera- tion 9.832 m/s2. a) What is his mass in the Canal Zone? Answer in units of kg b) What
70. ## Honors Pre-Calculus

The latitude of Durham, North Carolina is 36 degrees North. About how far from Durham is the North Pole? Use 3963 miles for the radius of the Earth. I believe there is a formula of s=r times the feta angle, but you may have to convert the degrees to
71. ## Math

At the same time of day a cable pole and a yard stick cast shadows of 20 ft. and 4 ft. persfectively as shown in the diargram below. if the angle of elevation of the sun is the same for both the cable pole and the yard stick determine the height od the
72. ## Math

A right circular pole has a base radiur r and a vertical angle 2ydegrees.Find the height of the pole in terms of r and y
73. ## maths

Two vertical poles, 3m and 7m long are on the same straight line with a point P on the ground. The shorter pole is 20m from P and the longer pole. The angle of elevation of the top T of the longer pole from the top R of the shorter one is 30degree,
74. ## Physics

1. If a bar magnet is broken into two pieces, how many magnetic poles are there? 2. A long straight wire carries a current in the direction shown in the following figure. At the point labeled A, is the direction of the magnetic field left, right, up. Down,
75. ## MATH

a guy wire is connected 3 ft. from the top of a pole. The guy wire is 36 ft long and it is fastened to an anchor in the ground that is 12ft. from the base of the pole. How tall is the pole? (nearest tenth) PLEASE HELP! =)
76. ## Simple Math

Please explain to me what I need to do . A cable 35 feet long runs from the top of a utility pole to a point on the ground 30 feet from the base of the pole. How tall is the utility pole ?
77. ## Maths

An antenna stands on a pole on the top of a house.If a woman is 70m from the house observes that the angles of elevation of the top and foot of the pole are 63 and 60 resp.,how long is the pole?
78. ## Algebra II

A hill is inclined 15 degrees to the horizontal. A 40-foot pole stands at the top of the hill. How long a rope will it take to reach from the top of the pole to a point 68 feet downhill from the base of the pole?
79. ## math

a pole of 50m high stand on a building of 250m high to an observer of at a height of 300 m, the building and the pole stands equal angles. what the distance of the obsrever from the top of the pole
80. ## physics

At the top of a pole vault, an athlete actually can do work pushing on the pole before releasing it. Suppose the pushing force that the pole exerts back on the athlete is given by = (160 ) - (170 ) acting over a distance of 0.21 .
81. ## Physics

At the top of a pole vault, an athlete actually can do work pushing on the pole before releasing it. Suppose the pushing force that the pole exerts back on the athlete is given by F(x)= (150 N/m)x - (180N/m^2)x^2 acting over a distance of 0.20 .
82. ## Algebra II

A hill is inclined 15 degrees to the horizontal. A 40-foot pole stands at the top of the hill. How long a rope will it take to reach from the top of the pole to a point 68 feet downhill from the base of the pole?
83. ## Math

a woman looking out from a window of a building at a height of 30meters observed that the angle of depression of a flag pole was 44°. if the foot of the pole is 25meters from the foot of the building from the same horizontal, find (a) correct to the
84. ## elementary math for teachers

The diagram depicts a rope connecting the top of a pole to the ground. The rope is 27 yd long and touches the ground 23 yd from the pole. How tall is the pole?
85. ## Physics

A flag pole consists of a 2.0 m long, 5.0 kg decorative ball on the end. What is the gravitational torque on the flag pole, calculated about an axis at the fixed end of the pole?
86. ## Math

A wire is stretched from the top of a 12-foot pole to a stake in the ground and then to the base of the pole. If a total of 20 feet of wire is needed, how far is the stake from the pole (the answer is NOT 16)
87. ## Maths

A 5 metre tall vertical pole is supported by a guy wire. The wire is attached to the top of the pole and is attached to the ground 3 metres from the base of the pole
88. ## 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
89. ## math

A street light is at the top of a 16.0 ft. tall pole. A man 5.9 ft tall walks away from the pole with a speed of 5.5 feet/sec along a straight path. How fast is the tip of his shadow moving when he is 47 feet from the pole?
90. ## Calculus

A street light is at the top of a 14.5 ft. tall pole. A man 5.3 ft tall walks away from the pole with a speed of 5.5 feet/sec along a straight path. How fast is the tip of his shadow moving when he is 47 feet from the pole?
91. ## math

A street light is at the top of a 11 ft. tall pole. A man 6.2 ft tall walks away from the pole with a speed of 4.5 feet/sec along a straight path. How fast is the tip of his shadow moving when he is 31 feet from the pole?
92. ## math

Two pieces of wire are stretched from the top M, of a vertical pole to the points L and N on the horizontal ground, The angle of depression of L from M is 65 degrees. N is on the opposite side of the pole (from L) at an angle of depression of 72 degrees
93. ## algebra

a piece of wire measuring 20 feet is attached to a telephone pole as a guy wire. the distance along the ground from the bottom of the pole to the end of the wire is 4 feet greater than the height where the wire is attached to the pole. how far up the pole
94. ## math

Find the angle of elevation of the top of a vertical pole 23long from a point on the ground 10away from the foot of the pole l
95. ## Related Rates

A street light is at the top of a 10.5 ft. tall pole. A man 5.4 ft tall walks away from the pole with a speed of 3.5 feet/sec along a straight path. How fast is the tip of his shadow moving when he is 47 feet from the pole?
96. ## math

A street light is mounted at the top of a 19-ft-tall pole. A man 5.5 feet tall walks away from the pole with a speed of 14 ft/s along a straight path. How fast is the tip of his shadow moving when he is 100 feet from the pole?
97. ## Math

An 8 foot long pole is propped against a fence to hold it up. The pole makes a 60 degree angle with the ground. How far above the ground does the pole come in contact with the fence?
98. ## algebra

A cable 25 feet long runs from the top of a utility pole to a point on the ground 18 feet from the base of the pole. How tall is the utility pole?
99. ## geometry

A cable 22 feet long runs from the top of a utility pole to a point on the ground 15 feet from the base of the pole. How tall is the utility pole? - thanks!
100. ## 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?