# 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.

225,149 results, page 50

1. ### Geology

Why isn't the land surface of Earth flat after millions of years of erosion by mass wasting as well as by other erosional agents?
2. ### physics

Consider a spacecraft that is to be launched from the Earth to the Moon. Calculate the minimum velocity needed for the spacecraft to just make it to the Moon’s surface. Ignore air drag from the Earth’s atmosphere. Hint: The spacecraft will not have zero velocity when it ...
3. ### physics

Consider a spacecraft that is to be launched from the Earth to the Moon. Calculate the minimum velocity needed for the spacecraft to just make it to the Moon’s surface. Ignore air drag from the Earth’s atmosphere. Hint: The spacecraft will not have zero velocity when it ...
4. ### US Gov.

I am stuck on two questions that I can't find in the textbook or online and I don't have any idea how to get the answer since the class doesn't start until Thursday and the quiz is also on that day, please help. 1. It is proposed to split the state of California into two ...
5. ### Astronomy

The volume of a ball is given in terms of its radius by V=(4*pi/3)*R^3. Use this to find the average density of Nursat, i.e. the mass per unit volume. Use Earth'€™s mass in kg from the Table of Constants to express your answer in kg/m3.
6. ### Physics

65 kg pole vaulter running at 10.2 m/s vaults over the bar. if height of bar was set at 4.96 m how fast was he moving as he cleared the bar
7. ### intro to physics

I was wondering if you guys can help me with this question An airplance is traveling 835 km/h in a direction 41.5 degrees west of north. part a) find the component of the velocity in the northerly direction part b) find the same but in the westerly direction part c) how far ...
8. ### physics

One gram of tungsten has 3.28 × 1021 atoms, and each tungsten atom has 74 electrons. How many electrons are contained in 9.00 g of tungsten? Answer in units of electrons
9. ### physics

a projectile is ejected from a 25 m high tower with a velocity of 40 m/s at an angle of 30 degrees to the horizontal first on Earth and then on Mars. What is the ratio of the time taken to hit the ground on Mars compared to Earth? (Assume gravity on mars = .38gEarth) The ...
10. ### Physics

Actually, I have 3 questions to solve. I know the 1st one requires Coulomb's constant, but I just can't get the formula to work. Ditto for the formulas for the other 2 questions. 1) A 6.3 μC point charge and a −1.7 μC point charge are separated by a distance of...
11. ### math

The ratio of an objects weight on earth to its weight on Neptune is 5:7. How much would a person who weighs 150 pounds on earth weigh on Neptune? A.210 pounds B.750 pounds c.107 1/7 pounds D.170 pounds
12. ### geometry

A satellite in a nearly circular orbit is 2000 km above Earth's surface. The radius of Earth is approximately 6400 km. If the satellite completes its orbit in 12 hours, calculate the speed of the satellite in kilometers per hour.(pay attention to the radius of the satellite's ...
13. ### science

A space probe of the surface of Mars sends a radio signal back to the Earth, a distance of 3 x 1010 km. Radio waves travel at the speed of light (3.00 x 108 m/s). How far away is the space probe? How many seconds does it take for the signal to reach the Earth? How many hours ...
14. ### Math

A plumber's assistant's rate of pay is \$0.75 per cubic foot of earth moved. He moves 220 cubic feet of earth to dig a trench. He moves the same amount to fill the trench. What is his pay for this job? \$___________ (These questions are all confusing)
15. ### physics

Recently, Asteroid 2012 DA14 came within 34,200 km from the center of the earth at its point of closest approach. If the moon goes around the earth once every 27.5 days, what is the ratio of the distance of closest approach of DA14 to the radius of the orbit of the moon?
16. ### phYSICS!!!

Recently, Asteroid 2012 DA14 came within 34,200 km from the center of the earth at its point of closest approach. If the moon goes around the earth once every 27.5 days, what is the ratio of the distance of closest approach of DA14 to the radius of the orbit of the moon?
17. ### PHYSICS!!!

Recently, Asteroid 2012 DA14 came within 34,200 km from the center of the earth at its point of closest approach. If the moon goes around the earth once every 27.5 days, what is the ratio of the distance of closest approach of DA14 to the radius of the orbit of the moon?
18. ### Physics

Recently, Asteroid 2012 DA14 came within 34,200 km from the center of the earth at its point of closest approach. If the moon goes around the earth once every 27.5 days, what is the ratio of the distance of closest approach of DA14 to the radius of the orbit of the moon?
19. ### Physics

Recently, Asteroid 2012 DA14 came within 34,200 km from the center of the earth at its point of closest approach. If the moon goes around the earth once every 27.5 days, what is the ratio of the distance of closest approach of DA14 to the radius of the orbit of the moon?
20. ### Math

Can someone please help me set this up. I didn't quite understand how to do this today. Before leaving Earth, the mass of an astronaut is measured to be 60kg. The astronaut lands on the Moon and measures the acceleration of gravity to be 1.6 m/s2(squared). What would the ...
21. ### geometry

A flagpole has a height of 10 yards. It will be supported by three cables, each of which is attached to the flagpole at a point 4 yards below the top and attached to the ground at a point that is 8 yards from the base of the pole. Find the total number of feet of cable that ...
22. ### Physics

Two Kids pull opposite directions on a toy with a mass of 18kg. One exerts a force of 695N and the other 135N. Both pull horizontally and friction is void. Calculate the new force in N?
23. ### physics

two people carry a heavy electric motor by placing it on a light board 2m long.one person lifts at one end with a force of 700N, and the other lifts the opposite end with a force of 400N.Calculate the weight of the motor and determine where its center of Gravity is Located
24. ### physics

two people carry a heavy electric motor by placing it on a light board 2m long.one person lifts at one end with a force of 700N, and the other lifts the opposite end with a force of 400N.Calculate the weight of the motor and determine where its center of Gravity is Located
25. ### physics

two people carry a heavy electric motor by placing it on a light board 2m long.one person lifts at one end with a force of 700N, and the other lifts the opposite end with a force of 400N.Calculate the weight of the motor and determine where its center of Gravity is Located
26. ### Science

A CHILD IS BORN ON EARTH IN 2000. yOU ARE 94.6 TRILLION KILOMETERS AWAY FROM EARTH AND YOU SEE THE CHILD'S 3RD BIRTHDAY. HOW OLD IS THE CHILD AT THE TIME OF THE CHILD'S 3RD BIRTHDAY?
27. ### astonomy

Assume that earth and mars are perfect spheres with the radii of 6,371km and 3,390 km, respectively. Calculate the surface area of earth. b)calculate surface area of mars
28. ### math

An object weighing 5 pounds on Earth will weigh 2 pounds on Mercury. The Brooklyn Bridge weighs 14,695 tons on Earth. What would it weigh on Mercury (in tons) ?
29. ### physical science

Which one of these statements is true about Copernicus? a. His model included planetary orbits that were circular. b. He believed that Ptolemy's ideas about the shape of orbits were correct c. His model could not account for retrograde motion of Mars. d. His model of the ...
30. ### math-urgent

1. two cards are drawn from a standard of 52 cards. Find the probability that the second card is a spade given that the first card is a club. 2. Suppose you draw 3 cards from a standard deck of 52 cards . Find the probability that the third card is a club given that the first ...
31. ### Math

1. 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 also varies according to the elevation of the object? In particular, the weight of an object follows this equation: , where C is a constant, and...
32. ### Math

1. 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 also varies according to the elevation of the object? In particular, the weight of an object follows this equation: , where C is a constant, and...
33. ### Physics3

Two charged particles of equal magnitude (+Q and +Q) are ﬁxed at opposite corners of a square that lies in a plane (see ﬁgure below). A test charge −q is placed at a third corner. If F is the magnitude of the force on the test charge due to only one of the ...
34. ### 9th grade

At a certain time, a vertical pole 3 meters tall casts a 4 meter shadow. What is the angle of elevation of the sun? Round your answer to the nearest meter
35. ### eastern michigan

A pole-vaulter just clears the bar at 4.24 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3500 J. What is his weight?
36. ### physics

A +5.7 C and a -3.5 C charge are placed 25 cm apart. Where can a third charge be placed so that it experiences no net force? (Restrict your analysis to a linear one.)
37. ### chemistry

for the reaction, determine the number of transferring electrons so then i can pug into G=-nFE I'm assigning charges to each of the elements H2O2(aq) + 2ClO2(g) → O2(g) + 2HClO2(aq) (+1,-1) + (+4,-2) (0) (+1,+1,-2) since O changes from -1 to 0, so it lost one electron ...
38. ### chemistry

for the reaction, determine the number of transferring electrons so then i can pug into G=-nFE I'm assigning charges to each of the elements H2O2(aq) + 2ClO2(g) → O2(g) + 2HClO2(aq) (+1,-1) + (+4,-2) (0) (+1,+1,-2) since O changes from -1 to 0, so it lost one electron ...
39. ### PHYSICS

In the early 1900s, Robert Millikan used small charged droplets of oil, suspended in an electric field, to make the first quantitative measurements of the electron’s charge. A 0.67-um-diameter droplet of oil, having a charge of +e, is suspended in midair between two ...
40. ### Physics

I have two questions: How many hours of light and darkness are there in June at regions south of the Antartic Circle (dotted line in Southern Hemisphere)? Six months later, when the earth is at the December position, is the situation in the Antartic the same or is it the ...
41. ### earth

On planet Tehar, the free fall acceleration is the same as that on the Earth, but there is also a strong downward electric field that is uniform close to the planets surface. A 2.00k ball having a charge of 5.00C is thrown upward at a speed of 20.1 m/s. It hits the ground ...
42. ### Algebra

Available evidence suggests that about 20 percent of the asteroid’s mass turned to dust and spread uniformly over Earth after eventually settling out of the upper atmosphere. This dust amounted to about 0.02 g/cm^2 of Earth’s surface. The asteroid very likely had a ...
43. ### Physics

Peggy drives from Cornwall to Atkins Glen in 52 min. Cornwall is 75 km from Illium in a direction 26° west of south. Atkins Glen is 27.1 km from Illium in a direction 16° south of west. Use Illium as your origin. (a) Draw the initial and final position vectors. (Do this on ...
44. ### physics

two kids push on a 10kg box. one pushes 100N to the west and the other pushes north at 200N. what is the acceleration of the pbject?
45. ### physics

Two electrostatic point charges of +30 μC and +25 μC exert a repulsive force of 200 N on each other. What is the distance between the two charges?
46. ### math

if an object on earth is projected upward with an initial velocity of 32 feetper second, then its height after t seconds in given by h(t)=32t-16t^2
47. ### college algebra

The electrical resistance of a wire of a given material varies as its length and inversely as the square of the diameter. if a wire 300 feet long and 0.05 inches in diameter has a resistance of 30 ohms, (a) find the resistance of a wire which is 1000 feet long and 0.02 inch in...
48. ### physics

questoins asked in a physics lesson which i find hard to answer: 1) do all objects have the same acceleration when they fall to earth? explain the answer. 2) what is the difference between weight and mass? any help would be greatly appreciated :)
49. ### grade nine space

What is the difference between the terms rotation and revolution? I need to use the Earth to support my answer.
50. ### physics

A girl drives 3.9 km north, then 13.1 km to the northwest, and finally 4.58 km south-southwest. What is her displacement in terms of the unit vectors with pointing east and pointing north?
51. ### English

Can you check these sentences for me, please? 1)He is a superstar now and he is slamming (a synonym?) on his guitar. 2)He is responsible for the building (?) of Westminster Abbey. 3)He withdrew from Britain to defend Rome against (or from?) a Barbarian attack. 4)According to ...
52. ### Science

According to science, the fastest speed posssible for anything is the speed of light. The speed of light is about 186,000 mies per second. That means that in one minute, lighttravels 11,160,000 miles. The star nearest Earth is the Sun. It's about 93,000,000 miles from Earth. ...
53. ### Physics

1.) The earth's radius is about 3956.52 mi. An object that has a mass of 20 kg is taken to a height of 160 km above the earth's surface. a. What is the mass of the object at this height? b. How much does the object weigh at this height?
54. ### Physics

A biker rides700m north 300m east 400m north, 100m west, 1200m south 300m east and finally 100m north .Draw the path of motion of the biker. What distance did he cover?What was his displacement?
55. ### electrostatic physics

Two charged particles of equal magnitude (+Q and +Q) are ﬁxed at opposite corners of a square that lies in a plane (see ﬁgure below). A test charge −q is placed at a third corner. If F is the magnitude of the force on the test charge due to only one of the ...
56. ### Physics

You place two charges a distance r apart. Then you double each charge and double the distance between the charges. How does the force between the two charges change? a) The new force is twice as large. b) The new force is half as large. c) The new force is four times as large...
57. ### Physics

Hi, I have two homework problems I am having issues with. 1. Two carts of equal mass, m = 0.250 kg, are placed on a frictionless track that has a light spring of force constant k = 53.0 N/m attached to one end of it. The red cart is given an initial velocity of V = 2.55 m/s to...
58. ### physics

One dimension. In Fig. 13-32, two point particles are fixed on an x axis separated by distance d. Particle A has mass mA and particle B has mass 4.00 mA. A third particle C, of mass 80.0 mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at ...
59. ### physics

One dimension. In Fig. 13-32, two point particles are fixed on an x axis separated by distance d. Particle A has mass mA and particle B has mass 4.00 mA. A third particle C, of mass 80.0 mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at ...
60. ### AP Physics C

One dimension. In the figure, two point particles are fixed on an x axis separated by distance d. Particle A has mass mA and particle B has mass 5.00 mA. A third particle C, of mass 62.0 mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at ...
61. ### Math

Question: 1 The product of two positive numbers is 15876 and the large one is 9 times the other. Find the numbers. Question:2 Th sum of the squares of two positive whole numbers is 794. If one of the numbers is 13 , find the other.
62. ### math

two cars leave town at the same time. one travels west at 56 mph, and the other travels south at 42 mph. after one hour, how far apart are the cars?
63. ### Physics

Two 10-cm-diameter charged rings face each other, 20cm apart. The left ring is charged to -22nC and the right ring is charged to +22nC . What is the magnitude of the electric field E⃗ at the midpoint between the two rings?
64. ### Physics

A satellite experiences a gravitational force of 228 N at an altitude of 4.0xE7 m above Earth. What is the mass of this satellite ?
65. ### Physics

You are given two transverse waves on a string: f1(x) and f2(x) moving toward each other. At an initial time, the wave f1(x) (lying between 0 and 5 m) moves to the right at v1 = +1 m/s and f2(x) (lying between 5 and 10 m) is moving to the left at v2 = −1 m/s.
66. ### phYsics

Two identical objects each hold a net charge of q = 8e. If the gravitational force between the two objects exactly cancels the electrostatic force between the objects, what is the mass of each object? Where G: 6.67E-11 Ke=8.99E9 I know the equation is m=sqrt(ke*q^2/G) yet when...
67. ### Astronomy

1. What color are stars that are very hot and very bright? A. Red B. Blue C. White D. Yellow 2. During the contraction of a protostar, density increases and ______ rises. A. Nuclear energy B. Dust C. Temperature D. Outflow 3. What is the apparent brightness of a star? A. How ...
68. ### physics

1. what happens to the field strength when you halve the distance between two charges? 2. A positive charge of 3.5 uC is located in an electric field of intensity 3.00 N/C directed toward the south. Find the magnitude and the direction of the force on the test charge. 3. Three...
69. ### Philosophy

Can someone please check my answers if it is right. Thank you! True/False 1. Rosenstand argues that moral subjectivism is an intuitively sound, "live and let live" kind of moral position that is both appealing and socially cohesive. -FALSE 2. For the members of the Flat Earth ...
70. ### science

Name at least two processes that change Earth's surface quickly.
71. ### 6th grade science

What two parts of the earth system is a paleontologist involved in? Thanks
72. ### Chemistry

Why are the two words "alkaline" and "earth" used to name the group 2 metals?
73. ### physics 2

two points of 2 C and a 5 C are 10 meters apart. A third point charge of 6 C is placed between them. at what distance from 2 C charge must the 6 C charge is placed, in such way that stay in equillibrium?
74. ### Physics

A coordinate system (in meters) is constructed on the surface of a pool table, and three objects are placed on the table as follows: a 5.0 kg object at the origin of the coordinate system, a 12.0 kg object at (0, 2.0), and a 16.0 kg object at (4.0, 0). Find the resultant ...
75. ### science

Sarah wants to use a model to get an idea of how far away the stars are. She uses a marble to represent the Earth, and she places a basketball 1 m away to represent the Sun, which is the nearest star. If Sarah wishes to keep the distances between objects in her model at an ...
76. ### geometry

how do i find the radius of the earth
77. ### physics

In a cathode-ray tube, electrons are projected horizontally at 1.0×10^6 m/s and travel a horizontal distance 11.5 cm across the tube. How long are the electrons in flight? Express your answer to two significant figures and include the appropriate units. Find the vertical ...
78. ### physics question

Due to electric effects on the earth and in the atmosphere, there is an electric field near the earth's surface that points down. Assuming the electric field is uniform with a magnitude of 150 N/C, what charge would a 145g baseball need to float as though it were weightless? I...
79. ### us history vietnam war

How did President Kennedy respond to the news that the Viet Cong were winning their war against the non-communist government of South Vietnam? A. Kennedy sent combat troops to fight the Viet Cong. B. Kennedy ordered the U.S. Air Force to bomb North Vietnam. C. Kennedy sent ...
80. ### College Physics

A positive and a negative charge are positioned as shown: + | 3.00 meters - _______| 4.00 meters Q1 = 4.00 microCoulomb Q2 = -4.00 microCoulomb 1. What is the distance between the charges? 2. What is the angle of West of south? 3. What is the force of + on -? 4. What is the ...
81. ### College Physics

A positive and a negative charge are positioned as shown: + | 3.00 meters - _______| 4.00 meters Q1 = 4.00 microCoulomb Q2 = -4.00 microCoulomb 1. What is the distance between the charges? 2. What is the angle of West of south? 3. What is the force of + on -? 4. What is the ...
82. ### Earth Science (check answers)

1. The mass number of an atom is obtained by totaling the number of_____and____. a. electrons and protons b. electron and neutrons c.protons and neutrons d.neutrons and isotopes Is it B? 2. Which of the following statements about the chemical combinations of atoms to form ...
83. ### Physics Need Help PLEASE

Two point charges are separated by 8 cm. The attractive force between them is 14 N. If the two charges attracting each other have equal magnitude, what is the magnitude of each charge?
84. ### physics

One hazard of space travel is debris left by previous missions. There are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. Calculate the force exerted by a 0.150 mg chip ...
85. ### Math

When a concrete structure is built, an engineer often performs a slump test on the concrete to ensure that it is of suitable strength and consistency. The engineer fills a truncated cone with a bottom diameter 200mm, top diameter 100mm and height 300mm with concrete. The ...
86. ### physics

Unless otherwise stated, all objects are located near the Earth's surface, where = 9.8 . A hockey puck with a weight of 0.80 is sliding freely across a section of very smooth (frictionless) horizontal ice. Part A When it is sliding freely, how does the upward force of the ice ...
87. ### science

displacement vectors of 5km north, 3km east, 2km south, and 3km west combine to a total displacement of? 3km north 13km west 0km 2km south I think 13km west
88. ### Science(chem)

This question relates to what someone posted below... It was explained to them that a reducing agent is oxidized when it reduces? I would like to get this concept straightened out in my head. I originally got this concept when I did gen chem but I have forgotten it. Let me see...
89. ### physics

Assuming Earth behaves as a perfect sphere with a radius of 6380 km, the standard gravitational acceleration,g, at sea level has a value of 9.80 m/s^2. a.) As Earth rotates on its axis, objects at the equator experience a slightly different value of g due to additional ...
90. ### social studies

asia and north america are separated by what water may i ask you a question michon? I am stuck on this question. Asia and north america are separated by the? two words. Pacifc Ocean??? It could also be Bering Strait, between northeastern Asia and northwestern North America.
91. ### Calc

A spherical snowball is placed in the sun. The snowball melts so that it's surface area decreases at a rate of 2 cm2 /min. Find the rate at which the diameter decreases when the diameter is 8 cm. I'm not sure what formulas to use, SA and/or Volume. And im not sure how to ...
92. ### Physics

A disk with a mass of 13 kg, a diameter of 25 cm, and a thickness of 8 cm is mounted on a rough horizontal axle as shown on the left in the figure. (There is a friction force between the axle and the disk.) The disk is initially at rest. A constant force, F = 70 N,is applied ...

You are the science officer on a visit to a distant solar system. Prior to landing on a planet you measure its diameter to be 2.070E+7 m and its rotation to be 19.8 hours. You have previously determined that the planet orbits 1.590E+11 m from its star with a period of 368.0 ...
94. ### URGENT Physics help

An attractive force of 7.2 N occurs between two point charges that are 0.10 m apart. If one charge is 4.0 µC, what is the other charge? (µC = 1.0 × 106 C) (Points : 3) 1.0 µC 2.0 µC +1.0 µC +2.0 µC Which substance is most easily grounded? (Points : 3) plastic foam plate...
95. ### Physics

A coordinate system (in meters) is constructed on the surface of a pool table, and three objects are placed on the table as follows: a 7.0-kg object at the origin of the coordinate system, a 8.0-kg object at (0, 2.0), and a 17.0-kg object at (4.0, 0). Find the resultant ...
96. ### Physics

A coordinate system (in meters) is constructed on the surface of a pool table, and three objects are placed on the table as follows: a 4.0 kg object at the origin of the coordinate system, a 5.0 kg object at (0, 2.0), and a 9.0 kg object at (4.0, 0). Find the resultant ...
97. ### physics

A de-orbit burn, similar to that presented in the previous math problem, has been performed. During this de-orbit burn a pre-calculated ∆V (delta V, change in velocity) of 290 ft/s (or 88.4 m/s) will be used to decrease the Shuttle’s altitude from 205 miles to 60 miles...
98. ### physics

A simple temperature model for the solar nebula disk is ￼Tdisk(a) = 20 × SQRT 100 AU/ a K, (1) where a should be expressed in AU in this equation. ￼(a) Find the temperature in the solar nebula disk at the orbit of Mer- cury, Earth and Jupiter. (b) Where is the ...
99. ### physics

Stemming a chimney. A rock climber of mass 71 kg wants to make her way up the crack between two rocks as shown in the figure below. The coefficient of friction between her shoes and the rock surface is ìS = 0.90. What is smallest normal force that she can apply to both ...
100. ### physics

why is earth bulged at the equator?will any one explain me about this?