# 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.

225,384 results, page 56

1. ### Momentum

A 1400 kg car moving south at 11.5 m/s collides with a 2800 kg car moving north. The cars stick together and move as a unit after the collision at a velocity of 5.24 m/s to the north. Find the velocity of the 2800 kg car before the collision.
2. ### Electronic Instrumentation

Calculate the force in Newtons that exists between a positive charge of 2C and a negative charge of 5.2 X 10^19 electrons separated by a distance of 25 cm.
3. ### trig

Two ships, one sailing at 30 km/hr and the other at 45 km/hr, left port at the same time. Three hours later they were 120 km apart. If you had to find the angle between their courses an equation that could be used to solve this problem is:
4. ### math

the shadow of an electric pole is 5m long when the angle of elevation of the sun is 60 degree .find the length of the shadow when the angle of elevation of the sun is 45 degree.
5. ### physics

A typical red blood cell has a mass of 3.0 10-16 kg. A blood sample placed in a centrifuge is subjected to a force of 4.6 10-11 N when the centrifuge is operated at 138 rev/s. What is the diameter of the centrifuge?
6. ### calculus

A flag pole is 40 feet high and stands on level ground. a flag is attached to a 120 foot rope passing through a pulley at the top of the flagpole. The other end of the rope is tied to a car at ground level. If car was driving directly away from flagpole at 3ft/sec, how fast is...
7. ### Physics

An airplane is heading 20degree north flying at 200km/hr relative to the air. Simultaneously the wind carries the plane 10degree, east of south at the speed of 60km/hr. (a) find the velocity of the plane relative to the ground. (b) find the component (east and south) of the ...
8. ### physics

A satellite orbits a planet at a distance of 3.80 108 m. Assume that this distance is between the centers of the planet and the satellite and that the mass of the planet is 3.90 1024 kg. Find the period for the moon's motion around the earth. Express the answers in days.
9. ### physics

One of two 207.0 kg crates is dragged across the floor at a constant speed with a horizontal force of 197.0 N. How much force would it take to drag them both across the floor if they are tied together one behind the other? How much force would it take to drag them both across ...
10. ### physics

One of two 207.0 kg crates is dragged across the floor at a constant speed with a horizontal force of 197.0 N. How much force would it take to drag them both across the floor if they are tied together one behind the other? How much force would it take to drag them both across ...
11. ### physics

A long horizontal hose of diameter 4.6 cm is connected to a faucet. At the other end, there is a nozzle of diameter 1 cm. Water squirts from the nozzle at velocity 20 m/sec. Assume that the water has no viscosity or other form of energy dissipation. a) What is the velocity of ...
12. ### physics

two forces act on an object, force A id 8.7N and force B is 12.9N. The angle between the two forces is 125 degrees. what is the net force on the object?
13. ### geometry

the #'s given are the coordinates of two points on a # line. find the distance between the two points. -3 and 5 what is the distance between these
14. ### geometry

the #'s given are the coordinates of two points on a # line. find the distance between the two points. -11 and -27 what is the distance between these
15. ### English

I forgot to add these two other sentences you checke before. I just wanted to be sure. 1) He created a potion capable of releasing (or to release) his evil side. 2)The individual is left in front of two choices. (is given only two choices/has only two choices). Which one is ...
16. ### Science

Hey everyone I need some omework jelp as you can see.I'm not that well in Science so could you give me some tips? And i would like somr homework help for the following passge and answers. DIRECTIONS Read the paragraph and answer the questions. You can find examples of the ...
17. ### physic

An aeroplane is heading 20 degree North of East,flying at 200km/hr relative to the air. Simultaneously the wind carriers the plane 10degree East of South at speed of 60.0km/hr. (a) find the velocity of the relative to the ground.(you may solve it graphically) (b) find the ...
18. ### math

THE DISTANCE FROM EARTH TO MOON IS ABOUT 22^4 MILES . THE DISTANCE FROM EARTH TO NEPTUNE IS ABOUT 22^7 MILES . WHICH DISTANCE IS GREATER ? ABOUT HOW MANY TIMES GREAT ?
19. ### eng

the primary purpose to al gore's an inconvenient truth is a. to inform the readers that there is environmental hazard in burning fossil fuels b. to entertain readers with stories from his college days and his professor's quotations c. to persuade the readers that by taking ...
20. ### Math

The universal law of gravitation determines the amount of force exerted by a constant mass (M) on another constant mass (m), separated by a distance (r), is given by the expression F = ( -GmM )/r^2 a) What mathematical expression characterises the instant rate of change of the...
21. ### Reasoning

John walks 7 blocks west and then 13 blocks north, then makes a right and walks 7 blocks east and makes another right and walks 15 blocks south. How far is John from his previous location? (13-7)(15-7) 6-8=2 I just don't know if it's 2 blocks south or north
22. ### physics 20

Two people, a and b, are pulling on a tree with ropes while person c is cutting the tree down. Person a applies a force of 80.0N (45.0degrees) on one rope. Person b applies a force of 90.0N (345degrees) on the other rope. Calculate the net force on the tree.
23. ### physics

Gravitational Attraction 1. The centers of two 11.80 kg spheres are separated by 0.09 m. What is their gravitational attraction? 2. What is the ratio of this attraction to the weight of one of the spheres (at the surface of the Earth)? Please answer both, I'd be greatful. ...
24. ### math

Studying for a final help. Many people know that the weight of an object varies on different planets,but did you know that the weight of an object on earth aalso varies according to the elevation of an object? In oparticular, the weight of an object follows this equation: w=cr...
25. ### physics

A laboratory centrifuge on earth makes n rpm (rev/min) and produces an acceleration of 3.30 g at its outer end. This centrifuge is now used in a space capsule on the planet Mercury, where g mercury is 0.378 what it is on earth. How many rpm (in terms of n) should it make to ...
26. ### math

two trains start from towns 208 miles apart and travel towards each other on parallel tracks. They pass each other 1.6 hours later. If one travels 10 mph faster than the other find the speed of each train?
27. ### math

The radius of the earth is approximately 3950 miles. The radius of Jupiter is approximately 44,400 miles. Since the radius of Jupiter is more than 11 times that of the earth, which comes closest to the volume of Jupiter ?
28. ### physics

On planet X, an object weighs 18.1 N. On planet B where the magnitude of the free-fall acceleration is 1.28 g (where g = 9.8 m/s 2 is the gravitational acceleration on Earth), the object weighs 37.9 N. The acceleration of gravity is 9.8 m/s 2 . What is the mass of the object ...
29. ### earth

Six artificial satellites complete one circular orbit around a space station in the same amount of time. Each satellite has mass m and radius of orbit L. The satellites fire rockets that provide the force needed to maintain a circular orbit around the space station. The ...
30. ### physics

The average distance separating Earth and the Moon is 384,000 km. A 2.6x104 kg spaceship located halfway between them. (b) What is the total potential energy of the ship?
31. ### Managerial economics

Suppose Nick produces to goods @ cost C(q1,q2)=1000=.5q1^2+.5q2^2->5q1q2 If nick produces only one of he two goods his cost is given this cost function with the other good set = to 0. The inverse demand functions for the two goods are given by p1=a-.25q1 and p2=A-.05q2 a=17...
32. ### Physics

A 12.0 kg block sits on a frictionless table. On top of this block is placed a 5.00 kg block. The coefficient of static friction between the two blocks is 0.70. a) What is the maximum force that can be applied horizontally to the 5.00 kg block before it slips? b) What is the ...
33. ### physics 2

A charge, q1, of +4.4 micro-coulombs and another unknown charge, q2, are surrounded by a surface. The total flux through the surface is -9.2 x 106 (N m2)/C. These charges are now placed on the x axis. q1 is placed at x = 0, and q2 is placed at x = +114.51 cm. What is the ...
34. ### physics

If a person pushes on a block and it travels a distance of 6.0m before stopping. How far would the block travel if it were pushed with the same force, but on the moon(which has 1/6 of the earth's gravity).
35. ### Weight Is Force! Science

A space ship has a mass of 9000kg. The spaceship is launched from the Earth and lands on a distant planet where it has a weighted of 39000 N. What is the acceleration of gravity on this planet?
36. ### Calculus

Two posts, one 12 feet high and the other 28 feet high, stand 30 feet apart. They are to be stayed by two wires, attached to single stake, running from ground level to the top of each post. Where should the stake be placed to use the least wire?
37. ### Calculus

Two posts, one 12 feet high and the other 28 feet high, stand 30 feet apart. They are to be stayed by two wires, attached to single stake, running from ground level to the top of each post. Where should the stake be placed to use the least wire?
38. ### math

The ocean covers about 71% of the Earth’s surface. If the total surface area of the Earth is about 510 million square kilometers, how many square kilometers are covered by the ocean?
39. ### Biology

The water cycle is best described by which of the following statements? Water in the atmosphere must be converted to another chemical before animals can use it. The water on earth changes forms as it moves from one reservoir to another.>----- My answer As water moves ...
40. ### Fluid Mechanics

A circular disc having a diameter of 125cm is immersed in water so that the distance of its perimeter measured vertically below the water surface varies between 60cm and 150cm. Find the total force due to the water acting on one side of the lamina, and the vertical distance of...
41. ### Fluid Mechanics

A circular disc having a diameter of 125cm is immersed in water so that the distance of its perimeter measured vertically below the water surface varies between 60cm and 150cm. Find the total force due to the water acting on one side of the lamina, and the vertical distance of...
42. ### Fluid Mechanics

A circular disc having a diameter of 125cm is immersed in water so that the distance of its perimeter measured vertically below the water surface varies between 60cm and 150cm. Find the total force due to the water acting on one side of the lamina, and the vertical distance of...
43. ### Fluid Mechanics

A circular disc having a diameter of 125cm is immersed in water so that the distance of its perimeter measured vertically below the water surface varies between 60cm and 150cm. Find the total force due to the water acting on one side of the lamina, and the vertical distance of...
44. ### Fluid Mechanics

A circular disc having a diameter of 125cm is immersed in water so that the distance of its perimeter measured vertically below the water surface varies between 60cm and 150cm. Find the total force due to the water acting on one side of the lamina, and the vertical distance of...
45. ### College Science

A chandelier is suspended by two identical, vertical chains side by side. The chandelier's mass is m = 5.3 kg. A. If the tension in one chain is represented by T, write an expression for this tension in terms of m and g, the gravitational acceleration on the Earth's surface. ...
46. ### physics

find the force and force direction of a 1.0x10^-6 C charge that is 2cm North and 3cm East of a 2x10^-6 C charge
47. ### math

tow people begin walking from the same point at the same time. One walks due south at 3 mph and the other walks southeast at 4 mph. Approximately how far apart are the two after one hour walking?
48. ### Physics

The gravitational force of attraction between two students sitting at their desks in physics class is 2.35 ✕ 10-8 N. If one student has a mass of 46.2 kg and the other student has a mass of 62.6 kg, how far apart are the students sitting?
49. ### Physics

The gravitational force of attraction between two students sitting at their desks in physics class is 2.23 ✕ 10-8 N. If one student has a mass of 52.0 kg and the other student has a mass of 57.4 kg, how far apart are the students sitting?
50. ### Science

At the distance of the earth from the sun the pressure exerted by sunlight is avout 10^-5 Pa How much force does this pressure exerted on 10m^2 array of solar cells on a satellite when the array is perpendicular to the direction of the sunlight? If the satellite has a mass of ...
51. ### Physics

At the distance of the earth from the sun the pressure exerted by sunlight is avout 10^-5 Pa How much force does this pressure exerted on 10m^2 array of solar cells on a satellite when the array is perpendicular to the direction of the sunlight? If the satellite has a mass of ...
52. ### Physics

A satellite of mass 220 kg is launched from a site on Earth's equator into an orbit at 200 km above the surface of Earth. (a) Assuming a circular orbit, what is the orbital period of this satellite? 5310 s (b) What is the satellite's speed in its orbit? 7790m/s (c) What is the...
53. ### Earth science

what is the material between 2900 kilometers and 5200 kilometers below earths surface inferred to be
54. ### Enviro Science

Describe the diversity of species on Earth, relating the difference between known numbers and estimated numbers Thanks -MC
55. ### Science

How is the temperature of the Earth affected by factors controlling the balance between incoming radiation and radiation emitted...?
56. ### Physics/Barycentre

I read the Earth/Moon Barycentre is located 74/100ths from the centre of the earth towards the earths surface. As the moons orbit varies from Perigee to Apogee by more than 30,000 miles I would have thought the Barycentre would move around according to the moons position in ...
57. ### Physics

a ship is headed towards east at a thrust speed of 7.00 knots. A strong wind pressure causes the ship to deviate to the north at 1.00 knots. The sea current is flowing to the southwest at 4.00 knots. Determine the velocity of the ship relative to the earth's surface.
58. ### Trigonometry

1. Ben is pulling on a tobaggan rope with a force of 250 newtons. The rope makes a 36 angle with the ground. What force is actually working to move the tobaggan to the right? 2. If a boat going 6 mi/hr in still water suddenly encounters a crosscurrent of 4 mi/hr, at what angle...
59. ### PHYSICS

In attempting to pass the puck to a teammate, a hockey player gives it an initial speed of 1.43 m/s. However, this speed is inadequate to compensate for the kinetic friction between the puck and the ice. As a result, the puck travels only one-half the distance between the ...
60. ### physics

The figure below shows a test charge q between the two positive charges. Find the force (in newtons) on the test charge for q = 1 µC. Give a positive answer if the force is to the right and a negative answer if the force is to the left. 2µC....-3cm-....q...-2cm-...3µC
61. ### math: percent and fractions

Can you give me two examples of two realistic percent problems in which the percents are actually nice fractions and the numbers involved are compatible with the fractions. One problem should as for the part, given the whole and the percent. And the other problem should ask ...
62. ### physics

Consider a situation where immediately after birth, twins are separated. One continues to live on earth, while the other is whisked away in a space ship at 90% of the speed of light. After 65 years they are reunited. Will they look the same? I know that the twin that was ...
63. ### Physics

The gravitational force of attraction between two students sitting at their desks in physics class is 2.34 ✕ 10^-8 N. If one student has a mass of 45.0 kg and the other student has a mass of 61.6 kg, how far apart are the students sitting?
64. ### Physics.

A block of mass 3m is placed on a frictionless horizontal surface, and a second block of mass m is placed on top of the first block. The surfaces of the blocks are rough. A constant force of magnitude F is applied to the first block. a) Identify the horizontal force that ...
65. ### English

1. I don't have a little money. 2. I don't have little money. 3. I don't have some money. 4. I don't have any money. 5. I have a lot of money. (Are all grammatical? Does # 1 mean #5?) 6. Do you have much money? - Not much. (Is the answer correct?) 7. He has too much money in ...

Given one of the roots of the quadratic equation x^2+kx=12 is one third the other root. Find the possible values of k.
67. ### Math-Calculus

Consider two ships which are joined by a cable attached to each ship at the water line. Suppose the two ships are 200 metres apart, with the cable stretched tight and attached to a pulley which is anchored halfway between the ships at a depth of 45 metres. If one ship moves ...
68. ### physics

Two capacitors have the same plate separation, but one has square plates and the other has circular plates. The square plates are a length L on each side, and the diameter of the circular plate is L. The capacitors have the same capacitance because they contain different ...
69. ### Math

two trains are traveling toward each other adjacent tracks. one of the trains 230 feet long and is moving at a speed of 60 miles per hour. The other train is 220 feet long and is traveling at the rate of 70 miles per hour. Find the time interval between the moment the trains ...
70. ### Physics

A Venturi flow meter is used to measure the the flow velocity of a water main. The water main has a diameter of 30.0 cm, and the constriction has a diameter of 10.0 cm. The two vertical pipes are open at the top, and the difference in water level between them is 3.0 m. Find ...
71. ### Astronomy

Two bodies with equal masses orbit the Sun in a circular orbit. If the radii of the two orbits are the same then following is true: a) The orbital period of the two bodies is the same because their masses are the same. b) Their orbital period of the two cannot be the same ...
72. ### Physics

Two carts with the same mass are pushed together with a compressed spring between them. When the carts are let go, both move apart, from the spring force. Which will move with a higher speed? What will be the total momentum of the system be? Two cars, one with mass m and the ...
73. ### math

In a group of 9 coins, one is fake and weighs slightly more. What is the fewest number of times you need to use a pan balance to find the counterfeit coins? (A pan balance is a scale used to measure weights, where weights are placed in two pans. The heaviest pan will go down ...
74. ### help!

Can you please give me one of them so I cansolve for the other one?PLease! The general formula for a straight line is y = mx + b. Just plug the points into the equation to arrive at two equations. 6=2m+b 10=4m+b you have two equations and two unknowns. Solve them ...
75. ### History

Which of the following was the provision in the Treaty of Paris 1763? A. All French land in North America was to be given to England B. All French land in North America was to be given to Spain C. All French lands west of the Mississippi and Louisana were to be given to ...
76. ### math

these marbles are placed in a bag and two of them are randomly drawn what is the probability of drawing two pink marbles if the first one is placed back in the bag before the second draw thebag has 10 marbles.2 yellow.3 pink.5 blue
77. ### math

these marbles are placed in a bag and two of them are randomly drawn what is the probability of drawing two pink marbles if the first one is placed back in the bag before the second draw thebag has 10 marbles.2 yellow.3 pink.5 blue
78. ### math

these marbles are placed in a bag and two of them are randomly drawn what is the probability of drawing two pink marbles if the first one is placed back in the bag before the second draw thebag has 10 marbles.2 yellow.3 pink.5 blue
79. ### Physics Classical Mechanics

A person of mass m2= 85.0 kg is standing on a rung, one third of the way up a ladder of length d= 3.0 m. The mass of the ladder is m1= 15.0 kg, uniformly distributed. The ladder is initially inclined at an angle θ= 35.0∘ with respect to the horizontal. Assume that ...
80. ### statistics

Six cards-ace, king, queen of hearts; ace, king of diamonds; and king of clubs-are all placed face down a table. One card is to be selected at random. Find the probability: a) of an ace, given that a diamond was turned b) of an ace, given that a club was turned c) of a heart, ...
81. ### physics

a) You are sitting at the center of the back seat of a car without seat belts and friction is low. The car suddenly makses a right turn. Describe what happens to you. WHich of Newton's laws is applicable? The car would be goind straight before the turn so when it suddenly ...
82. ### physics

. The space shuttle typically orbits 400 km above the earth's surface. The earth has a mass of 5.98 × 1024 kg and a radius of 6,380 km. A) How much would a 2000 kg part for the space station weigh when it has been lifted to that orbit in the shuttle's cargo bay? B) What is ...
83. ### Physics

The space shuttle typically orbits 400 km above the earth's surface. The earth has a mass of 5.98 × 1024 kg and a radius of 6,380 km. A) How much would a 2000 kg part for the space station weigh when it has been lifted to that orbit in the shuttle's cargo bay? B) What is the ...
84. ### Physics

Imagine a fender bender between a large truck and a small car. During the impact, Choose one answer. a. the truck exerts a greater amount of force on the car than the car exerts on the truck b. the car exerts a greater amount of force on the truck than the truck exerts on the ...
85. ### Physics

Two blocks (M1 = 2.57 kg and M2 = 6.71 kg) are in contact on a frictionless, horizontal tabletop. An external force, $\vec{F}$, is applied to block 1, and the two blocks are moving with a constant acceleration of 2.59 m/s2. What is the contact force between the blocks? What is...
86. ### History

Would reconstruction of the south be considered a success or failure based on the fact that the south's goal was to fight for slavery and the north's goal was to mantain the union. keeping in mind, both wanted the right to make their own decisions.
87. ### Earth Science

Two locations, one in northern canada and one in the southwestern United states, recive the same amount of precipitation each year. The location in canada is classified as a humid climate. Why would the location in the United states be classified as an arid climate?
88. ### physics

extrapolation is the process whereby we extend an established numerical relationship between two variables beyond the limits of our observed and recorded data. why extrapolation would not be useful and wise to use in force-elongation graph? In force-elongation, as one ...
89. ### phy

1 What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth gR2(R+h)2 gR(R+h) Rg(R−h) R2g(R−h)2 2 The instrument used for experimental determination of the value of the universal gravitational constant G is ...
90. ### physics

1 What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth gR2(R+h)2 gR(R+h) Rg(R−h) R2g(R−h)2 2 The instrument used for experimental determination of the value of the universal gravitational constant G is ...
91. ### Physics

Satellites A and B are in circular orbits, with A two and a half times as far from earth's center as B. How do their orbital periods compare?
92. ### Math

Two people are holding a box. One person exerts a force of 140 pounds at an angle of 65.5 degrees with the horizontal. The other person exerts a force of 115 pounds at an angle of 58.3 degrees with the horizontal. Find the net weight of the box.
93. ### math 117

Can some help me with this appendix please. Thank you Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of an object ...
94. ### algerbra 1

Antartica comprises about 10.5% of the total land area on earth. antartica has a surface area of about 5,400,000 square miles. what is the total land area on earth? write an equation and slove.
95. ### Math

The weight of an object on the planet Mercury is about 2/5 the weight of that object on the Earth. An object that weighs 30 pounds on Earth would weigh how many pounds on Mercury? Need solution because I think it is 7.5 but my parents think the answer is 12. Thank you.
96. ### Math

You start a search for a buried object by marking the center of a filed as (0,0), with coordinates giving distances in yards. Coordinates to the north or east are positive and coordinates to the south or west are negative. You find nothing at (-12,8), so you try a likely-...
97. ### Physics

A smooth circular hoop with a radius of 0.400 m is placed flat on the floor. A 0.450-kg particle slides around the inside edge of the hoop. The particle is given an initial speed of 8.50 m/s. After one revolution, its speed has dropped to 4.00 m/s because of friction with the ...