# 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. ## Science

1. Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? (1 point) a solar eclipse* a lunar eclipse a total lunar eclipse a penumbra 2. Which of the following statements about a lunar eclipse is true? (1
2. ## Math 115 CH 8

Compare the population per square mile in Asia to the population per square mile in North America for the year 2000. North America : land area 9,400 (1,000 mi squared) population 305,000,000 Do I divide 305,000,000 by 9,400,000? and do the same for Asia?
3. ## Calculus Or Something

Find the true location of the sun in relation to your reference of the horizon if the sun is observed to make an angle of theta with the horizon. This is not an easy question. Use Snell’s law to take into account the aberration and bending of light rays
4. ## Physics

A 0.1134kg spherical meteor of diameter 3 cm enters the earth’s atmosphere at an elevation of 121920m with a velocity of 13411.2 m/s. The meteor’s temperature is -73.15˚C. The specific heat at constant volume (Cv) of the meteor is 800 J/kg˚C. (a) If
5. ## physics

1.) A squirrel found a pile of nuts 80 meters from its nest. The squirrel made one trip from its nest to the pile. The squirrel with nuts in its mouth headed back towards the nest for 35 meters when it saw a cat. Seeing the cat, it dropped its nuts and ran
6. ## College Physics

In ordinary laboratory circuits, charges uC (microcoulomb) and nC (nanocoulomb) range are common. How many excess electrons must you add to an object to give it a charge of (a) -2.50 uC (b) -2.50 nC.
7. ## Chemistry

Elements that tend to lose electrons to acieve the electron dot structure of noble gases below them in atomic number on the periodic table are known as metals?
8. ## chem

Which of the following ions contains lone pair of electrons at the central atom? A) SO4 2- B) NO3 - C) IO3 - (Is there any ways without drawing the diagrams and I could still able to figure out the answer???) Thx very much
9. ## Physics

Two small spheres spaced 20.0 centimeters apart have equal charge. How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57×10 −21 newtons?
10. ## Chemistry

it's a review for our exam. a ____ is formed by a liquid at its surface in a tube, and can be shaped upwards or downwards. also.. what is the the Relative Mass for protons, neutrons, and electrons? thanks a ton :]
11. ## Physics

At a given instant three electrons, in vacuum, happen to lie on a straight line. The first and second are separated by 3.00x 10-6 m, while the second and third are 8.00 10-6 m apart. What is the magnitude of the net electrostatic force on the middle
12. ## Physics

I have a test tomorrow and I don't really understand this question, I was hoping somebody could help explain it? If 2.75x10¹⁹ electrons pass a point in a circuit in 30s, what is the current?
13. ## Science

What is true about the element francium (Fr, atomic number 87)? Choose all that apply. A) It has seven valence electrons. B) It is likely to form ionic bonds. C) It is in Period 7. D) It is nonmetal. E) It is a metal. I think it is B, C, and E?
14. ## physics

Light falls on a photoelectric surface that has a work function of 2.90 eV. If the voltage required to stop the ejected electrons is 0.210 V, what is the wavelength of the incident radiation?
15. ## science

in a wet type of voltaic cell, what is electrolyte? a. a bridge made of salt b.a copper strip c. an acidic liquid d. a spontaneous flow of electrons
16. ## Chemistry

What is true about the element francium (Fr, atomic number 87)? Choose all that apply. A) It has seven valence electrons. B) It is likely to form ionic bonds. C) It is in Period 7. D) It is nonmetal. E) It is a metal. I think it is B, C, and E?
17. ## Science

What is true about the element francium (Fr, atomic number 87)? Choose all that apply. A) It has seven valence electrons. B) It is likely to form ionic bonds. C) It is in Period 7. D) It is nonmetal. E) It is a metal. I think its B, C, E. Am I right?
18. ## Physics

A small charge that has lost 5.0 X 10^3 electrons and has a mass of 2.0 x 10^-6 kg experiences an acceleration of 15ms^2 when placed at a point P in space. Determine the magnitude and direction of the electric field at P
19. ## Chemistry

What are three common types of products produced by reactions that occur in aqueous solutions? (out of the following) -gases -water -electrons -precipitates -acids -ions -bases
20. ## History

What Demographic Transition Model stage is Belize, Cuba, GReece, Swaziland, Switzerland, Vietnam, South Korea, Niger, Uruguay,and Haiti in? Is there a website to get accurate answers? I think Belize is stage 2, Cuba is stage 3, Greece is 4, Swaziland 3,
21. ## Physics

A light plane is flying at 25 degrees east of due magnetic north, while ascending at 15 degrees above the horizon; the plane is flying at 40 m/s. Find the planes celocity true to the delta x, delta y, and delta z?
22. ## physics

1.A truck with a mass 5000 kg is heading East at 20 m/s. Meanwhile a car with a mass 2500 kg is heading North at 30 m/s. The two vehicles collide at an intersection, get stuck together, and the wreckage keeps moving to some direction.find the speed of the
23. ## Social studies

what was initial reason for columbus journey to the new world(1 point) To seek religious freedom as a result of the split of the Protestant reformation •• To find a sea rout to Asia that would the Spain direct access to valuable products to Asia To
24. ## Physics

When the Earth, Moon, and Sun form a right triangle, with the Moon located at the right angle, the Moon is in its third-quarter phase. Find the magnitude of the net force exerted on the Sun. Find the direction of the net force exerted on the Sun. Give the
25. ## EARTH SCIENCE

Cumulus and stratus clouds belong to which cloud group? A. Puffy clouds B. High clouds C. Middle clouds D. Low clouds Is it A? What is the basic cause of ocean tides? A. Gravitational force of volcanic activity B. Gravitational attraction between the Moon
26. ## Social Studies

2. How did World War 2 affect life in Georgia? (Choose all that apply.) A. More Georgians were out of work than ever before B. Many pepole moved to the North or West C. Pepole made sacrifices for the war effort. D. African american Georgians moved to the
27. ## Geography

Hi Oprah here Just wanna know what would be a circulating current of warmer materal ( such as magma ) ??? Help please Thanks I'm not quite sure what you are asking. Is the material molten earth, water or something else? Since this is not my area of
28. ## Science

1. Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? (1 point) a solar eclipse* a lunar eclipse a total lunar eclipse a penumbra 2. Which of the following statements about a lunar eclipse is true? (1
29. ## Science HELP PLZ

1. Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? (1 point) a solar eclipse* a lunar eclipse a total lunar eclipse a penumbra 2. Which of the following statements about a lunar eclipse is true? (1

*** = my answer choice. 1. Which of the following best describes the Klu Klux Klan during Reconstruction? A. a gun club for former Confederate Soldiers. B. a secret political terrorist organization. C. a social group whose members masqueraded in sheets and

Describe the geography of Southern South America and how this geography influences economic activity? My Answer: Southern South America consists of 3 nations, Paraguay, Uruguay and Argentina. The Rio de la Plata is great river system that consists of 4
32. ## biology

What is the source of energy driving the hydrolic cycle? a. evaporation of the ocean water b. heat conducted from the earth's core to the surface c. radiant heat from the sun d. air currents returning to the earth's surface I chose a) evaporation of the
33. ## Physics

A man moves due north 6km then he moves 4km due west and then moves 4km southwards finally he moves 4km eastwards.Find his: total distance and displacement
34. ## Physics

(1) body is taken to depth of 32km below the surface of the earth. Calculate the percentage decrease in the weight of the body at this depth (The radius of the earth is 6400km) (2)A wire of mass per unit length 5.0gm-1 is stretched between 2 points 30cm
35. ## SCIENCE PLZZ HELP!!!

____ is rate of change of position. Speed Velocity Acceleration Displacement 2. Which of the following is the difference between speed and velocity? direction units speed none of the above 3. A planet is discovered that is the same size as Earth and has
36. ## PHYSICS

HOW DO U COMPUTE g USING THE EQUATION g=GM/r^2 WHEN GIVEN THE QUESTION IN THIS FORM: "COMPUTE g AT A HEIGHT OF 4 RE ABOVE THE SURFACE OF EARTH" -basically how can i find the answer to a question given in this form
37. ## college physics

A 915 kg two-stage rocket is traveling at a speed of 5.50×10^3 m/s with respect to Earth when a pre-designed explosion separates the rocket into two sections of equal mass that then move at a speed of 4.00×10^3 m/s relative to each other along the
38. ## Geography

5. Although politically united with England since 1907, Scotland has retained all of the following except its own a. system of laws b. religion c. parlimentary system d. system of education I think this can either be A or C 6. Most of the Nordic region has
39. ## chm

If a neutral element has 8 neutrons and 7 electrons, which expression correctly identifies the element?
40. ## Physics

A metal sphere has a charge of +12C. What is the net charge after 2.1 x 1013 electrons have been placed on it?
41. ## chem

Why is it expected that 2/10 of the ejected electrons will cone from the n=1 shell, and 8/10 ofthe electron from the n=2 shell?
42. ## Chemistry

Excited state electrons lose energy when they move to the ground state.
43. ## Physics

A metal sphere has a charge of +12uC(microcoulombs). What is the net charge after 2.1 x 10^13 electrons have been placed on it?
44. ## Science

how does a cloud that is charged with electrons form? What is the charge (positive or negative) of such cloud?
45. ## Chemistry

An aluminum sheet used for food preservation weighs about 0.05 g/cm-2 How many electrons are in a 1 cm2 of this sheet?
46. ## science

(c) The kinetic energy of the emitted electrons is measured to be 15.2 eV. What is the first ionization energy of Hg in kJ/mol?
47. ## Physics

An iron ion contains 26 protons, 27 neutrons, and 23 electrons. What is the net charge of the ion?
48. ## physics

metal sphere has a charge of +10C. What is the net charge after 5.1 x 1013 electrons have been placed on it?
49. ## Chemistry

Element X has 6 protons, 8 neutrons, and 6 electrons. Predict the atomic mass of element X?
50. ## chemistry

the number of electrons present in 18 ml of water at 4 degrees celsius? a)6.023*10^24 b)6.023*10^23 c)4.76*10^21 d)4.76*10^20
51. ## Chemistry

How many unpaired electrons are there in the following transition metal ions in their hexacyano-complex ions? Fe^3+, Pd^2+,CO^2+
52. ## Chemistry

Why did rutherford model of the atom require that electrons be in motion whereas Thomson's model did not.
53. ## chemistry

How many outer-shell d electrons are there in each of the following transition-metal ions? Re(III) Sc(III) Ru(IV) Hg(II)
54. ## biology

the combinded number of ? will determine the number of electrons in orbital around a neutral atom
55. ## Chem.

Which defines what element the atom is? a. protons b. neutrons or d. electrons. I think it might be neutrons, but can you verify this?
56. ## Physics

Water has a mass per mole of 18.0 g/mol, and each water molecule (H2O) has 10 electrons.
57. ## physics

In a typical electron microscope, the momentum of each electron is about 1.4 10-22 kg-m/s. What is the de Broglie wavelength of the electrons?
58. ## Chemistry

All chromium particles should have the same number of (protons,neutrons or electrons)? I think it is neutrons. Is that correct?
59. ## chem

is F2 +2 ion diamagnetic or paramagnetic? I think its diamagnetic because it loses 2 electrons and it still has no unpaired pairs...i think...thanks.
60. ## physics

A wire carries a 15 microampere current. How many electrons pass a given point on the wire in 1.0 ?
61. ## sanches

A wire carries a 15 microampere current. How many electrons pass a given point on the wire in 1.0 ?
62. ## Calculus

Answers to any of these questions would be of great help! (: 1 a) At noon, ship A is 150km west of ship B. Ship A is sailing south at 50km/h and ship B is sailing north at 30km/h. How fast is the distance between the ships changing at 4:00pm? b) A
63. ## Calculus

Answers to any of these questions would be of great help! (: 1 a) At noon, ship A is 150km west of ship B. Ship A is sailing south at 50km/h and ship B is sailing north at 30km/h. How fast is the distance between the ships changing at 4:00pm? b) A
64. ## North Hall

2x + 3y = -13 4x + y = -1
65. ## physics

The velocity of a ball changes from ‹ 8, −5, 0 › m/s to ‹ 7.88, −5.28, 0 › m/s in 0.04 s, due to the gravitational attraction of the Earth and to air resistance. The mass of the ball is 140 grams. I calculated the acceleration and got
66. ## physics

A ferry is crossing a river. The ferry is headed due north with a speed of 1.1 m/s relative to the water and the river’s velocity is 4.2 m/s to the east.Find the direction in which the ferry is moving (measured from due east, with coun- terclockwise
67. ## Algebra

A jet leaves the Charlotte, North Carolina, airport traveling at an average rate of 564 km/h. Another jet leaves the airport one half hour later traveling at 744km/h in the same direction. Use an equation to find how long the second jet will take to
68. ## Algebra

A jet leaves the Charlotte, North Carolina, airport traveling at an average rate of 564 km/h. Another jet leaves the airport one half hour later traveling at 744km/h in the same direction. Use an equation to find how long the second jet will take to
69. ## Physics

Speed of a satellite orbit (physics problem)? What is the speed of a satellite in a geosynchronous orbit about Earth? _________m/s Compare it with the speed of the Earth as it orbits the Sun. _________m/s
70. ## chemistry

When you touch an object, does the electrons from your hand exchange photons with the object?
71. ## CHEMISTRY

How many electrons are there in the p-orbital of a CH3 RADICAL (CH3.) I don't understand how it is 3.
72. ## science

A hydrogen atom has one proton, two neutrons, and no electrons. Is this atom an ion?
73. ## physics

How many electrons pass through a wire in 5 minutes, if the current through a wire is 400 mA
74. ## Chemistry

How many electrons are there in the p-orbital of a CH3 RADICAL (CH3.) I don't understand how it is 3.

When you touch an object, does the electrons from your hand exchange photons with the object?
76. ## Physics

2.0x10^13 electrons flow through a transistor in 1.0ms. What is the current through the transistor?
77. ## chemistry

A certain element forms an ion with 54 electrons and a charge of +2. Identify the element.
78. ## physics

A metal sphere has a charge of +6.4 C. What is the net charge after 4.1 x 1013 electrons have been placed on it?
79. ## chemistry

The number of protons in an anion must always be ________ the number of electrons. the same as We can’t tell. less than greater than
80. ## physics

How can you tell if moving electrons are being deflected by a magnetic field, an electric field, or both?
81. ## physics

The charge carried by one electron is e = -1.6 × 10-19 C. The number of electrons necessary to produce a charge of -1.0 C is:
82. ## chemistry

in an element on the periodic table, which number tells you the how many electrons are in that element??
83. ## Physics

If 0.01% of electrons are removed from 18 gm water, then calculate the charge produced in the water.
84. ## physical science

A 100 kg ball of lead rests next to a 10 kg rock. Which statement below is true? a. the lead ball and the rock have equal amounts of inertia b. if the lead ball and the rock fell from the same height in a vacuum, the rock would hit the ground first because
85. ## Physics 1 - Mechanics

You are making a trip in a space shuttle, and your friend Jimmy is in another space shuttle. He shares the same circular orbit with you, which is 420 km above the Earth, but he is 21 km ahead of you. (a) How long will it take you to catch up with your
86. ## physics

Your friend weighs 145 lb. What is her mass in kilograms if she went to the moon where the acceleration of gravity is 1/6 that on earth? i know that her weight in newtons is 652.5, and that her mass in kilograms is 65.25, and that her weight in newtons if
87. ## Physics Classical Mechanics

A planet has a single moon that is solely influenced by the gravitational interaction between the two bodies. We will assume that the moon is moving in a circular orbit around the planet and that the moon travels with a constant speed in that orbit. The
88. ## Science

Where does magnetism comes from? Magnetic forces arise from the movement of electrons (electric charge). In case you want it, here is more information on magnetism. http://en.wikipedia.org/wiki/Magnetism http://www.phy6.org/Education/Imagnet.html
89. ## Grammar and Composition

Using a map select cities in these coordinates. Then, using a newspaper or other resources, describe the weather forecast for these cities. I've done the first part. Now, for the second part, does it mean that I just find out the weather for today in those
90. ## Science

1. Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? (1 point) a solar eclipse* a lunar eclipse a total lunar eclipse a penumbra 2. Which of the following statements about a lunar eclipse is true? (1
91. ## Physics

1.Halley's comet moves about the sun in an elliptical orbit with its closest approach to the sun being 0.59 A.U. and its furthest distance being 35 A.U. [1 Astronomical Unit (A.U.) is the Earth-Sun distance.] If the comet's speed at closest approach is 54
92. ## Physics

A pendulum clock is accurate on earth, where the period of its pendulum is 1.00 s. (a) Find its period on the moon, where gravitational acceleration is 1.6 m/s2. (b) During a 2 h interval, what would be the elapsed time shown on the clock? CAN YOU PLEASE
93. ## Physics - Gravitational force

Find the gravitational force between earth and the sun. I am using the formula Fg = (G*m1*m2)/(r^2) where G = 6.67*10^-11 m1 = 6.0*10^24kg m2 = 2.0*10^30kg r = should i use the sun's radius or the earths (Rearth = 6.38*10^6; Rsun = 6.96*10^8) either way i
94. ## chemistry

An element has an ion with +2 charge.It has 38 electrons and 51 neutrons. write the nuclear symbol for the element.
95. ## Chemistry

If the total number of electrons in the ion [M (H2O) 4] +2 is equal to 50 Whish is the atomic number of M?
96. ## physical science

an object has 2.0x 10^19 more electrons than protons. What is the net electric charge of this object in coulomb?
97. ## Physics

A chlorine ion contains 17 protons, 16 neutrons, and 18 electrons. What is the net charge of the ion in Coulomb?
98. ## Chemistry

What does my professor mean by this? Given A, Z for an atom, calculate the number of protons, neutrons and electrons in a neutral atom.
99. ## chemistry

If an element has three electrons in its outmost evergy level, what charge would most likely form on an ion from this element?
100. ## Physics

A metal sphere has a charge of +7.80μC. What is the net charge after 5.97E+13 electrons have been added to it?