# 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 59

1. ### gaya ,college science

Which one of the following is an alkaline earth element? a) carbon b)sodium c)zinc d)iron
2. ### social studies

please check my answer: why did african americans go from the rural south to northern cities starting in the late 1800s? - so they could be around other races and cultures - to change identities - to escape the discrimination and to find better jobs ** - religious persecution ...
3. ### Physics

A 50g mass (M1) will be attached to the trolley M2) and will cause it to accelerate a distance of between .5 to .6m. You also catch the trolley immediately after it has passed through the photogate. The time for the trip will be noted and recorded. The trolley is on a track. ...
4. ### trigonometry

Two planes leave the same airport at the same time. one flies 20 degrees east of north at 500 mph. the second flies 30 degrees east of south at 600 mph. how far apart are the planes after 2 hours?
5. ### math i don't get it

If 6 equilateral triangles are placed side by side so that only two sides of each triangle touch one of the other triangles, what shape is formed? Please explain the answer.
6. ### Math

If six equilateral triangles are placed side by side so that only two sides of each triangle touch one of the other triangles what shape is formed? We are thinking circle?
7. ### Physics

Two dogs pull horizontally on ropes attached to a post; the angle problem 1 between the ropes is 60.0 degrees. If dog A exerts a force of 270N and dog B exerts a force of 300N find the magnitude of the resultant force and the angle it makes with dog A's rope.
8. ### Gravity, fields

Question 1) Consider two point-like objects, A and B, the first of which has four times the mass of the other (i.e. MA = 4MB). They are placed a certain distance d apart. (i) Sketch (in 2-dimensions) the gravitational field lines that are present in the region of space around ...
9. ### physics

if a car moves 12km North, 19km East, and 12km South, a) Find the total distance covered. b) Find the car's displacement.
10. ### physics

Vector has a magnitude of 136 units and points 35.0 ° north of west. Vector points 69.0 ° east of north. Vector points 19.0 ° west of south. These three vectors add to give a resultant vector that is zero. Using components, find the magnitudes of (a) vector and (b) vector...
11. ### Physics

I have to design a laboratory activity to answer the question, "What is the relationship between the diameter of a circle and the area of the circle?" My teacher said to use a previous activity as a templete to help me. For the previous activity you had to find the ...
12. ### phy

Two crates, of mass m1 = 60 kg and m2 = 130 kg, are in contact and at rest on a horizontal surface (Fig. 4-54). A 620 N force is exerted on the 60 kg crate. The coefficient of kinetic friction is 0.15. (a) Calculate the acceleration of the system.(to the right) (b) Calculate ...
13. ### Physics

Two blocks, stacked one on top of the other, slide on a frictionless horizontal surface. The surface between the two blocks is rough, however, with a coefficient of static friction equal to 0.50. The top block has a mass of 2.6 kg, and the bottom block's mass is 4.0 kg. If a ...
14. ### Physics

Two blocks, stacked one on top of the other, slide on a frictionless horizontal surface. The surface between the two blocks is rough, however, with a coefficient of static friction equal to 0.50. The top block has a mass of 2.6 kg, and the bottom block's mass is 4.0 kg. If a ...
15. ### College Physics

A sled at rest is suddenly pulled in three horizontal directions at the same time, but it does not move. Paul pulls to the northeast with a force of 31 lb. Johnny pulls at an angle of 36° south of due west with a force of 52 lb. Connie pulls with a force to be determined. 1) ...
16. ### physcis

A beam resting on two pivots has a length of L = 9.00 m and mass M =81.0 kg. The pivot under the left end exerts a normal force n1 on the beam, and the second pivot placed a distance 4.00 m from the left end exerts a normal force n2. A woman of mass m= 43.0 kg steps onto the ...
17. ### Physics

Two fixed, non-conductive, isolated rings of radii 25 cm are electrified and brought close to each other so that they are parallel. The distance between them is 1 m. You know that one of them has a charge of 1 nC(Nano Coulomb) evenly distributed on it, but you are not sure ...
18. ### physics

Two crates rest on top of one another.There is a crate of mass 4.62 kg on top of another crate of mass 2.19 kg. The coefficient of friction between the lower crate and the floor is μk = 0.440 and the coefficient of static friction between the two crates is μs = 0.870. If the...
19. ### physics

Two crates rest on top of one another.There is a crate of mass 4.62 kg on top of another crate of mass 2.19 kg. The coefficient of friction between the lower crate and the floor is μk = 0.440 and the coefficient of static friction between the two crates is μs = 0.870. If the...
20. ### physics

Two crates rest on top of one another.There is a crate of mass 4.62 kg on top of another crate of mass 2.19 kg. The coefficient of friction between the lower crate and the floor is μk = 0.440 and the coefficient of static friction between the two crates is μs = 0.870. If the...
21. ### physcial science

Why is a nail attracted to either pole of a magnet, but another magnet is attracted to only one of the poles? Did you post this twice? Please review my answer posted yesterday It looks like my answer to this same question by "jan" did not get posted. It was related to the fact...
22. ### Physics

Three dynamics carts have force sensors placed on top of them.(cart 1, with mass of 2.2 kg, has one sensor --> cart 2, with mass of 2.5 kg, has sensors two and then three --> cart 3, with mass of 1.8 kg, has sensors four then five). Each force sensor is tied to a string ...
23. ### Physics

A student spins a 1.2kg rock around above her head horizontally in an experiment which aims to model how satellites orbit the earth. The student counts 3 orbits per second when the string produces an orbit radius of 35cm. (a) Calculate the centripetal force acting on the rock...
24. ### Managerial economics

Posted by Patrick on Saturday, September 22, 2007 at 5:25pm. 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 ...
25. ### Physical Science

Diamond is a covalently bonded substance made of pure carbon. Each carbon atom has six total electrons so this means carbon shares ________ electron(s) with other carbon atoms. A) one B) two C) four D) six Help Please!
26. ### Math (Calculus)

At 2:00 pm boat K is 25 km north of boat L. If boat K is sailing 5 km/h west and boat L is sailing north at 20 km/h, what is the rate at which the distance between the two boats in changing at 2:30?
27. ### math

there are two planes. they both leave the airport at 1pm. one plane travels north at 150mph and the other plane travels west at 200mph. how many miles will they be apart at 3pm?
28. ### Physics

To move a large crate across a rough floor, you push on it with a force F at an angle of 21° below the horizontal, as shown in the figure. Find the force necessary to start the crate moving, given that the mass of the crate is m = 29 kg and the coefficient of static friction ...
29. ### Mechanics

Two forces act an angle of 120degre.The bigger force is of 40N and the resultant is perpendicular to the smaller one.Find the smaller force.
30. ### intro to psychology

People in the grocery store are asked to do a taste test of a new soft drink. Two paper cups are given to each volunteer. Fifty percent of the participants are given two different soft drinks. The other half receive the same product but are told that the drinks are different. ...
31. ### Chemistry

For a Sc atom in ground electronic state: 1. how many electrons are there in 4s orbitals? 2. how many electrons are there in 3d orbitals? 3. how many electrons are there in 4p orbitals? 4. how many unpaired electrons are there? 5. to what block does Sc belong to in the ...
32. ### math Puzzler..

Hello, This is just a question that has stumped me for some time: We have a normal watch. The big hand is 4cm long and the little hand is 3cm long. What's the distance between the tips of the hands at the moment they are moving the fastest towards each other. 5 cm. Think out ...
33. ### Nat sci

Two tugboats are towing a ship.Each exerts horizontal force of 5.0 tons and the angle between the two ropes is30°.What is the resultant force exerted on the ship
34. ### Geography

Just letting you guys know-- for one of my exams I asked this question: 'This nation is in South Asia. One of South Asia's three major rivers are in this country. The country has two climate regions, arid and semi-arid and the dominant religion in this country is Islam' I was ...
35. ### Physics

I just need help with c A long horizontal hose of diameter 4.2 cm is connected to a faucet. At the other end, there is a nozzle of diameter 2 cm. Water squirts from the nozzle at velocity 24 m/sec. Assume that the water has no viscosity or other form of energy dissipation. a) ...
36. ### EARTH SCIENCE- SO STUCK

How far from an earthquake epicenter is a city where the difference between the P-wave and the S-wave arrival times is 5 minutes and 00 seconds?
37. ### Astronomy

The gravity lock of the Moon to Earth is silimar to the action of a A) giant pendulum B) spinning top C) master key D) tidal wave E) magnetic compass I'm torn between A and E.
38. ### Physics

The force exerted by the wind on the sails of a sailboat is 310 N north. The water exerts a force of 240 N east. If the boat (including its crew) has a mass of 330 kg, what are the magnitude and direction of its acceleration? magnitude in m/s2 direction in ° north of east
39. ### physics 30

A current-carrying conductor that is 8.00x10^-2 m long is placed perpendicular to a magnetic field that has a strength of 6.00x10^-3 T. During a 3.00s time interval, 7.50x10^19 electrons pass a point in the conductor. The magnitude of the average magnetic force exerted on the ...
40. ### SCIENCE ASAP HELP PLEASE

which of the following features make earth and venus similar to each other ? A . their size and mass b. their rates of rotation c. their atmospheres d. their directions of rotation****
41. ### physics

Given that Earth orbits the Sun with a semimajor axis of 1.000 AU and an approximate orbital period of 365.24 days, determine the mass of the Sun. (1 AU = 1.496 ✕ 1011 m)
42. ### physic

Given that Earth orbits the Sun with a semimajor axis of 1.000 AU and an approximate orbital period of 365.24 days, determine the mass of the Sun. (1 AU = 1.496 ✕ 1011 m)
43. ### math

I have a math problem. A Mars year is 1.88 Earth years. If you are 13 years old in Earth years, about how would you be in Mars in Mars years? Thanks
44. ### physics

A proposed space station consists of a circular tube that will rotate about its center(like a tubular bicycle tire). The circle formed by the tube has a diameter of 1.1km. What must be the rotation speed(revolutions per day) in an effect nearly equal to gravity at the surface ...
45. ### Algebra II

Forces of 675 lb and 828 ob act on a body. The smaller force acts due north; the larger force acts N 52.3 degrees E. Find the direction and the magnitude of the resultant.
46. ### Physics

A car with a mass of 1700 kg is traveling directly northeast (45 degrees between north and east) at a speed of 14m/s (31mph), and collides with a smaller car with a mass of 1300kg that is traveling directly south at a speed of 18m/s (40mph). The two cars stick together during ...
47. ### Chemistry

A covalent bond forms when (1)two nuclei share electrons in order to achieve a complete octet of electrons (2) atoms form ions and then electrostatic forces of attraction bond the ions together. (3)repulsive forces between atoms are greater than the attractive forces (4) a ...
48. ### physics

How can I calculate the spring constant given only the following: equilibrium length of spring: 10.5 cm stretched length of spring (by attaching a mass): 12.5 cm object's mass: 198.9 grams -please help me...I'm really lost... You need to assume that the measurement was made at...
49. ### chemistry

Predict how many electrons will most likely be gained or lost by each of the following elements. (a) Se Will it gain or lose electrons? gain lose number of electrons (b) Cl Will it gain or lose electrons? gain lose number of electrons (c) Al Will it gain or lose electrons? ...
50. ### PHYSICS

TWO FORCES F1 AND F2 ARE ACTING AT RIGHT ANGLE TO EACH OTHER FIND THE EXPRESSION FOR THE RESULTANT FORCE?
51. ### physics - speed of electron in magnetic field

A beam of electron is accelerated by a potential difference of 2.5okV. The electrons are then allowed to pass into a magnetic field of strength 10.0mT. As the electrons enter the field, the direction of the velocity is at right angles to the direction of the magnetic field. ...
52. ### Physics please check

As you climb a mountain, your ears "pop" because of the changes in (a) In which direction does your eardrum move as you climb up? inward outward eardrum does not move Give your reasoning. I think the eardrum moves outward because the further you go away from the earth's center...
53. ### physics

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) g(R−h)R g(R−h)2R2 2 The instrument used for experimental determination of the value of the universal gravitational constant G is ...
54. ### Physical science

the space shuttle typically orbits 400 km above the earth's surface.the earth hass a mass of 5.98*10 to the 24 squared kg and a raduis of 6,380 km.A)how much would a 2000 kg part form the space station weight when it has been lifted to that orbit in the shuttle's cargo bay?B)...
55. ### college alg

The height of a projectile fired upward is given by the formula s = v0t − 16t2, where s is the height, v0 is the initial velocity, and t is the time. Find the time for a projectile to return to Earth if it has an initial velocity of 184 ft/s.
56. ### university

Two identical, isolated particles, each of mass 2 kg, are separated by a distance of 30 cm. What is the magnitude of the gravitational force of one particle on the other?
57. ### physics

the centers of two 5000 kg blocks are separated by 1.13 m. What is the gravitational force between the two blocks? What must be the distance between the centers of the blocks if the gravitational force decreases 25 times?
58. ### Physics

A boy travels 8km north, 3km east and then 5km south. Find the magnitude of displacement of the boy
59. ### applied math

A boat is located at a random location uniformly distributed inside of the circular pool of radius 1 mile. The boat is tied by a rope to a pole located directly at the center of the pool. A bird lands on the rope at the uniformly random location. If X is the distance between ...
60. ### math prob

A boat is located at a random location uniformly distributed inside of the circular pool of radius 1 mile. The boat is tied by a rope to a pole located directly at the center of the pool. A bird lands on the rope at the uniformly random location. If X is the distance between ...
61. ### chem 101

In an electron microscope the electrons generate the image. For one of the scanning electron microscopes in our Central Analytical Facility, the electrons are accelerated to have a kinetic energy of 200,000 eV. Electrons with this kinetic energy have a velocity of 2.67 x 10^8 ...
62. ### Physics

In the hydraulic system shown in the figure, the piston on the left has a diameter of 4.5cm and a mass is 3.0kg. If the density of the fluid is 710kg/m^3 , what is the height difference h between the two pistons in m? I checked the other similar questions like this and tried ...
63. ### 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 the bag has 10 marbles.2 yellow.3 pink.5 blue
64. ### 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 the bag has 10 marbles.2 yellow.3 pink.5 blue
65. ### Sunset

At noon, ship A is 50 miles north of ship B and is headed south at 16mph. Ship B is headed west at 12 mph. At what time are they closest together, and what is the minimum distance between them?
66. ### Math

1) A plane is located at C on the diagram. There are two towers located at A and B. The distance between the towers is 7,600 feet, and the angles of elevation are given. a) find BC, the distance from Tower 2 to the plane, to the nearest foot. b) find CD, the height of the ...
67. ### physics

1.An elastic cord is 5.0m long and 1.0cm in diameter and acts as a spring with spring constant 70 N/m, what is the young's modulus for this material? 2.A heavy uniform beam of mass 8000 kg and length 2.0m is suspended at one end by a nylon rope of diameter 2.5 cm and at the ...
68. ### PHYSIC

A ferryboat transports tourists among three islands. It sails from the first island to the second island, 4.38 km away, in a direction 37.0° north of east. It then sails from the second island to the third island in a direction 76.5° west of north. Finally, it returns to the...
69. ### Physics

A ferryboat transports tourists among three islands. It sails from the first island to the second island, 4.38 km away, in a direction 37.0° north of east. It then sails from the second island to the third island in a direction 76.5° west of north. Finally, it returns to the...
70. ### physics

two boys start running straight towards each other from two points that are 100m apart. one runs with a speed of 5m/s, while other moves at 7m/s.how close are they to the slower one's starting point when they meet?
71. ### Science

When two hydrogen atoms bond with one oxygen atom to form water, what happens to the electrons? A. Each hydrogen atom donates its electron to the oxygen atom. B. The oxygen atom donates an electron to ach hydrogen atom. C. A pair of electrons is shared at each of the hydrogen-...
72. ### Science

When two hydrogen atoms bond with one oxygen atom to form water, what happens to the electrons? A. Each hydrogen atom donates its electron to the oxygen atom. B. The oxygen atom donates an electron to ach hydrogen atom. C. A pair of electrons is shared at each of the hydrogen-...

The distance between two opposite vertices of the dodecagon is 2. Find the area of the dodecagon. first, what is the area of a dodecagon and second how to find it with just the distance between two oppositve vertices. i found that a dodecagon can be divided into 24 triangles: ...
74. ### English

1. I have seven balls. One is white, another is black, a third is blue, a fourth is green, a fifth is brown, a sixth is pink, and the other is orange. (Is this sentence grammatical and commonly used? 2. I have two balls: One is green and the other is yellow. 3. I have two ...
75. ### biomechanics

A 50 kg pole vaulter has a horizontal velocity of 8 m/s at the completion of her approach run, and her center of gravity is 1.0 m high. Estimate how high she should be able to vault if her kinetic and potential energies were all converted to potential energy.
76. ### we the people

For my homework i was given this: find an example when each of the 3 branches of the national government has checked one of the other 2. i cant find anything on the internet
77. ### geography

Which statement best describes the location of south west Asia ? A. north of Australia and west of Europe B. west of the Indian Ocean and east of the Mediterranean Sea C. south of the Arctic Circle and north of Antarctica. D. east of the Americas and west of Asia According to ...
78. ### college alg.

The height of a projectile fired upward is given by the formula s = v0t − 16t2, where s is the height, v0 is the initial velocity, and t is the time. Find the time for a projectile to return to Earth if it has an initial velocity of 184 ft/s. ____________ s
79. ### physics

Two equally long 12-cm diameter pipelines have the same pressure difference between ends. One carries a ‘Type A’ oil (𝜂 = 0.091 Pa s) and the other a ‘Type B’ oil (𝜂 = 0.064 Pa s). If ‘Type A’ oil flows at 0.14 m3/s, at which rate ...
80. ### Math: i do not understand

A tractor manufacturing company machines axles to extremely small tolerances. The main power axles have a mean diameter of 3.0000 inches and a standard deviation of 0.0050 inch. What is the probability that a given axle will have a diameter between 2.9915 and 3.0004 inches? ...
81. ### Physics

Your car is stuck in the mud and two friends are helping you. One is pulling on your car with a force of 370 N at a 40 degree angle and the other is pulling with a force of 450 N at a 30 degree angle. A force of 725 N is required to remove the car. Is the car still stuck? ...
82. ### Oceanography

I have an exam in oceanography coming up and I'm having a little trouble understanding directions. For example in my review sheet he asks question like this: In what compass direction does the coriolis force act in the following situations: An object moving west at 22 degrees ...
83. ### Science

The words to use are: crust, moving, lithosphere, asthenosphere, upper mantle, volcanoes, semisolid The ___1___, which includes the ___2___ and part of the ___3___, is divided into plates that carry all of Earth's lands and oceans. These plates float on a ___4___ layer of rock...
84. ### em

Answers for Two Forces Act At Angle Of 120 Degrees The Bigger Force Is 60 Degree M And Resultant Is Perpendicular To The Smaller One Find The Smaller Force
85. ### classical mechanics

enturi Flow Meter (19 points possible) A Venturi flow meter is used to measure the the flow velocity of a water main. The water main has a diameter of 40.0 cm, and the constriction has a diameter of 10.0 cm. The two vertical pipes are open at the top, and the difference in ...
86. ### south carolina history help me ASAP PLZZZZZ

which state voted first against independence, but eventually voted for it? new york north carolina delaware south carolina
87. ### Science

[I picked d.] How many species are estimated to be living on earth? a.between 10,000 and 1,000,000 b.between 500,000 and 1 million c.between 1 and 5 million d.between 10 and 50 million http://faculty.plattsburgh.edu/thomas.wolosz/howmanysp.htm This is a political, not ...
88. ### physics

t(s)=0.0,1.0,2.0,3.0,4.0,5.0,6.0,7.0 v(m/s)=0.0,4.6,8.9,13.4,18.0,22.9,27.6,32.0 find the area underneath the graph between t=2.0s and t=6.0s, i know i will have to break this down into two separate shapes, a rectangle and a triangle then add them together, i just don't know ...
89. ### Solved-Calculus-Please check?

the equatorial radius of the earth is approximately 3960 miles. suppose a wire is wrapped tightly around the earth at the equator. how much must this wire be lengthened if it is to be strung on 10 feet poles above the ground? (1 mile=5280 feet) delta y= dy/dx (2pir) * deltax ...
90. ### Phsyics Waves

Earthquakes are essentially sound waves traveling through the earth. They are called seismic waves. Because the earth is solid, it can support both longitudinal and transverse seismic waves. These travel at different speeds. The speed of longitudinal waves, called P waves, is ...
91. ### Physics

A 0.5 kg wooden block is placed on top of a 1.0 kg wooden block. The coefficient of static friction between the two blocks is 0.35. The coefficient of kinetic friction between the lower block and the level table is 0.2. What is the maximum horizontal force that can be applied ...
92. ### Science 8th Grade

What was the hiker's average velocity? Distance = 6km West Starting Time = 9:45 Ending Time = 10:45 A. 4.0 km/h south B. 0.10 km/h north C. 10 km/h south west D. 6 km/h west
93. ### physics

In a tug-of-war between two athletes, each pulls on the rope with a force of 270 N. What is the tension in the rope? ______ N If the rope does not move, what horizontal force does each athlete exert against the ground? ______ N is the first on 250 and is the second one 0?
94. ### Forces on Structures (Science)

What force continually changes a satellite's direction? Why doesn't a satellite need fuel to keep moving? What would be the effect on satellites now in orbit if Earth were to stop rotating?
95. ### TO BOBPURSLEY

acceleartiononmoon= GMassmoon/radius^2 =G 7.35E22/(1.74E6)^2= G 2.43E10= = 6.67E-11*2.43E10= 1.62 m/s^2 or as a gravitational field constant= 1.62 N/kg I have no idea why you used the mass of Earth. were did you get a = r^-2 Gm from i thought that the equation was net force = ...
96. ### 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 as shown in the figure. (a) Construct free-...
97. ### applied physics

two painters stand on a 10.00m scaffold. one,of mass 65.0kg, stands 2.00m from one end. the other, of mass 95.0kg, stands 4.00m from the other end. they share a paint container of mass 18.0kg located between the two and 2.50m from the larger person. what weight must be ...
98. ### physics

Ten bags of top soil, each weighing 150 N, are placed on a L = 2.95 m long sheet of wood. They are stacked 0.50 m from one end of the sheet of wood, as shown in Figure 8-27. Two people lift the sheet of wood, one at each end. Ignore the weight of the wood, how much force must ...
99. ### physics

Ten bags of top soil, each weighing 180 N, are placed on a 2.90-m long sheet of wood. They are stacked 0.50 m from one end of the sheet of wood, as shown below. Two people lift the sheet of wood, one at each end. Ignore the weight of the wood, how much force must each person ...
100. ### geography

Can you check my answers, please? 1. Latitude is measured north and south of what imaginary line? The Equator 2. Which of the following is not a city: Bangladesh, Tokyo, Amsterdam, New Delhi? Bangladesh 3. What is the name given to a point of land extending into a body of ...