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 45

Physics(Please help)
Three forces act on a hockey puck as it slides across the ice, and it is in equilibrium. The force F is applied at the center and has a magnitude of 25 N. The force F1 is applied at the top edge, and F2 is applied half way between the center and the bottom edge. Find the ... 
Philosophy
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. 2. For the members of the Flat Earth Society, who believe that all physical evidence of a round or ... 
Philosophy
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. 2. For the members of the Flat Earth Society, who believe that all physical evidence of a round or ... 
Physics
A 2.40 m length of wire is held in an eastwest direction and moves horizontally to the north with a speed of 15.1 m/s. The vertical component of Earth's magnetic field in this region is 40.0 µT directed downward. Calculate the induced emf between the ends of the wire and ... 
physics
Two point charges are placed on the x axis as follows: Charge q1= +4.00 nC is located at x= 0.200 m, and charge q2= +5.00nC is at x= 0.300 m. What are the magnitude and direction of the net force exerted by these two charges on a negative point charge q3= 0.600 nC placed at ... 
Math
A pole vaulter cleared the bar at 490 cm. Convert 490 cm to meters using a unit multiplier 
math URGENT!!
a rectangular box measures 4 by 5 by 2 meters. what is the length of the longest pole that can fit into the box? 
essay
I need to come up with an outline for a essay on the differences between the North usa and South? Any ideas? Thanx if u can help 
Finding a Formula, help please !
Does anyone know the formula to find any point between two other given points in a line? Please, and thank you! The mindpoint formula xm= _(x1 + x2) /2 ym = (y1 + y2) /2 This give the midpoint (xm, ym) between the points x1,y1 and x2,y2 Thanks for the tip, but I was wondering ... 
SS
What are the similarities between Africa north of the equator and south of the equator? 
physics
a)The star ships Enterprise and Potemkin leave the Earth and travel in opposite directions each at 0.60c relative to an observer on Earth.In the Enterprise's frame of reference how fast is the Potemkin moving away? b) Through what voltage must you accelerate a proton so that ... 
Phys Science
Good afternoon tutors..I need help on a few problems.Im really stuck.. 1) the space shuttle orbits at an altitude of approximately 200km above the surface of the earth. If the radius of the earth itself is 6380km, whats the acceleration de to gravity at the altitude of the ... 
physics
You are explaining to a friend why the crew of the International Space Station feels weightless while orbiting the Earth. Your friend responds that he thought gravity was just a lot weaker up there. Show that it isn’t so by calculating the acceleration due to gravity 350 km ... 
calculas
find the perimeter of the rectangle with maximum area that can be inscribed in a semicircle of radius 2 ft. if two of its vertices are on the diameter of the semicircle and the other two are on the semicircle. 
science
how the earth rotates by itself? Momentum imparted to it million of years ago when the solar system formed. One theory involves glancing collision with a large asteroid millions of years ago that also broke off material that eventually developed into the moon. I hope this ... 
Science HELP
Although the Amazon Basin receives more than 80 inches of rain per year, South America also has the driest place on Earth, known as A. Death Valley. B. Gobi Desert. C. Atacama Desert. D. the Caribbean. 
Physics
a particle (C) of mass m = 0.2 kg can slide without friction on an inclined plane making an angle alfa (a) = 30 degrees with respect to the horizontal (aka ground) . (C) is launched at at an instant to=0 along a line Ox of greatest slope with an initial velocity of Vo =5 m/s... 
Physic please check
A house has a floor area of 119 m2 and an outside wall that has an area of 32 m2. The earth's magnetic field here has a horizontal component of 2.1 x 10^5 T that points due north and a vertical component of 5.0 x 10^5 T that points straight down, toward the earth. (a) ... 
world geography
the united state has both the wettest and direst places on earth.the wettest is hawaii and the driest is death valley,california.is that means that south america does not has both 
Physics
An explorer in the dense jungles of equatorial Africa leaves his hut. He takes 41 steps at an angle 45∘ north of east, then 81 steps at an angle 60∘ north of west, then 49 steps due south. Assume his steps all have equal length. Save him from becoming hopelessly ... 
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 she went to the moon ... 
Geometry
Imagine that all the people on Earth could stand side by side together. How much area would be needed? Would all the people on earth fit in Rhode Island? Explain your reasoning. Rhode Island, the smallest state in terms of area, has a land area of 1000 square miles. Assume ... 
science
During space flight, astronauts often refer to forces as multiples of the force of gravity on Earth's surface. What does a force of 5g mean to an astronaut? If Earth were twice as massive but remained the same size, what would happen to the value of g? http://hyperphysics.phy... 
History
This was one of my few questions that i was struggling with. A) Describe the growth of North American slavery from 1619 to 1789. Include the status of the first Africans in North America, laws later established to govern them, and the reasons why planters switched from a labor... 
physics
Find the total displacement of a mouse that travels 1.0m north and then 0.8m south. 
Calc
A cylindrical slime tank is placed so that the axis of the cylinder is horizontal. Find the fluid force on a circular end of the tank if the tank is half full, assuming that the diameter is 6 feet and the slime weighs 54 pounds per cubic feet? 
Language Arts
"I'd wash the Amazon river and clean the oily Carib & Gulf of Mexico, Rub that smog off the North Pole, wipe up all the pipelines in Alaska, Rub a dub dub for Rocky Flats and Los Alamos, Flush that sparkly Cesium out of Love Canal" In this excerpt, Ginsberg uses repetition to ... 
geography
Bolivia is one of two land locked countries in South America. What is the name of the other country? Looking on a map it looks to be Paraguay. Is that correct? 
physics
While exploring a cave, a spelunker starts at the entrance and moves the following distances. She goes 75.0 m north, 250 m east, 116 m at an angle 30.0° north of east, and 200 m south. Find the resultant displacement from the cave entrance. 
World Geography
REVIWE 1.Using up resources is one of the negative effects of A. the birth rate. B. the death rate.<<<<<<<<< C. the infant mortality rate. D. rapid population growth. 2. The Prime Meridian and other imaginary northsouth lines measure A. longitude.&... 
earth
The globalmean surface temperature of the earth is about 288 degrees Kelvin. Use the StefanBoltzman law to calculate the radiative flux corresponding to an object with this temperature. [hint: use σT4 with σ = 5.67x108 Wm2K4 ] 
physic
Consider the earth following its nearly circular orbit (dashed curve) about the sun.(Figure 2) The earth has mass mearth=5.98×1024kg and the sun has mass msun=1.99×1030kg. They are separated, center to center, by r=93millionmiles=150millionkm. 
physics
Consider the earth following its nearly circular orbit (dashed curve) about the sun.(Figure 2) The earth has mass mearth=5.98×1024kg and the sun has mass msun=1.99×1030kg. They are separated, center to center, by r=93millionmiles=150millionkm. 
physics
The power output in the sun is about 4.00 x 10^26W. (a). Calculate the power per unit area (intensity), in kilowatts per square meter, reaching Earth's upper atmosphere from the sun. The radius of the Earth's orbit is 1.5 x 10^11m. 
science
a body is pulled towards the west by the force of 10N making an angle 30 degree with the south. What are the magnitude of the south and west direction component of the force? 
physics
An earth satellite moves in a circular orbit with an orbital speed of 6200m/s. a) find the time of one revolution. b) find the radial acceleration of the satellite in its orbit. 
Electrical Circuits
find the number of free electrons in a copper conductor having a diameter of 0.064 in. and a length of 1000ft. 
re math
Many people know that the weight of an objectvaries on different planets,butdid you know that the wieght of an object on earth also varies according to the elevation oj an object.in particualr ,the weight of an equation follows this equation:w=cr 2 squared, where c is ... 
trig
Lindsay is out one night and notices that her body casts a shadow that is 1.8m long when she is standing 5mfrom the pole supporting a street light Lindsay is 1.5m tall. 1what is the angle of elevation to the street light ? 2 how high is the street light 
trig
Lindsay is out one night and notices that her body casts a shadow that is 1.8m long when she is standing 5mfrom the pole supporting a street light Lindsay is 1.5m tall. 1what is the angle of elevation to the street light ? 2 how high is the street light 
Physics
Two movers have to life a refrigerator onto a truck. One of the movers wants to lift the refrigerator vertically, but the other mover wants to roll it up a ramp by applying a force parallel to the ramp. Assume the height of the truck is 1.5 m, the length of the ramp is 5.0 m, ... 
Physics
The gravitational force between two students is 3.20 x 10^8N if one student has a mass of 50,0kg and the other has a mass of 60.0kg, how far apart are the students sitting? 
Physics
A laser beam is directed at the Moon, 380,000 km from Earth. The beam diverges at an angle of 4.6×10−5 rad. 1. What diameter spot will it make on the Moon? 
physics
A constant force is applied to an object that causes a certain displacement. If the angle between the between the force and the displacement is 146 deg, then the work done by this force is A) zero B) not enough information given C) positive D) negative not sure how this is ... 
Social Studies (Please read this)
Please just make sure that my information is right and it is grammatically correct. Thank you! In 1965, Congress adopted the Voting Rights Act. Describe this act. In our description, explain what led Congress to pass the act, and describe at least two of the act's effects. The... 
Physics
PLEASE ANSWER ASAP!!!!!!!!!! step by step a) find the acceleration experienced by the driver of a car traveling at 50km/h if the car hits a pole and crumples 50cm. b) repeat part a) for a car traveling 100km/h 
Physics
PLEASE ANSWER ASAP!!!!!!!!!! step by step a) find the acceleration experienced by the driver of a car traveling at 50km/h if the car hits a pole and crumples 50cm. b) repeat part a) for a car traveling 100km/h 
Physics
.) Beth launches a rocket out in the courtyard. It stays in the air for 7.25 seconds before coming back down. a.) How high did it get? b.) With what velocity did it hit the ground upon returning to Earth? c.) What is its rate of acceleration as it slows down, reaches the peak ... 
Physics
How far above the surface of the Earth does an object have to be in order for it to have a weight which is 0.53 times the same weight as it would have on the surface of the Moon? (Ignore any effects from the Earth's gravity for the object on the Moon's surface or from the Moon... 
math
An 18 kg mass is placed st one end of a steel bar that is 1 m long. A 35 kg mass is placed at the other end. Where should the fulcrum be placed to balance the bar? 
physics
1. Two point charges are separated by 6 cm. The attractive force between them is 14 N. Find the force between them when they are separated by 12 cm. 2. The SI unit of mass is the kilogram. What is the SI unit of charge? 3. The proportionality constant k in Coulomb’s law is ... 
c++
Distance between two 3D points. Given two points in space (3dimensional), find the distance between them. The user will input the coordinates (x,y,z) of the two points and your program will calculate and display the distance between the points. 
Physics
Supposed a skydiver ( mass=75kg ) is falling toward the earth. When the skydiver is 100m above the earth he is moving at 60m/s. At this point calculate the skydiver: Gravitational potential energy Kinetic energy Total mechanical energy 
science
Given that Antarctica is roughly semicircular with a radius of 2000 km and has an average ice thickness of 3000 m. a) How many km3 of ice does Antarctica contain? b) Assuming all the ice melts, how much will this raise sea level (ignoring that the Earth has curvature and ... 
Physics
Consider the following four possibilities for two point charges and choose the one(s) that do not change the magnitude of the electrostatic force that each charge exerts on the other: A. Double the magnitude of each charge and double the separation between them. B. Double the ... 
Physics
Two 2.46uC point charges are located on the x axis. One is at x = 1.01m, and the other is at x = 1.01m. Determine the electric field on the y axis at y = 0.455m & Calculate the electric force on a 2.82uC charge placed on the y axis at y = 0.455m I'm using E=kq/r^2 and F=kqq/... 
Astronomy  Physics
Finally, we will look at a system that is in an orbit comparable to the Earth to see how the angle that the light strikes the surface and the length of day contribute to the total amount of energy that we receive from the Sun at the two solstices. Recall that the changing ... 
MATH!
To get from his high school to his home, Jamal travels 5.0 miles east and then 4.0 miles north. When Shelia goes to her home from the same high school she travels 8.0 miles east and 2.0 miles south. What is the measure of the shortest distance, to the nearest tenth of a mile, ... 
physics
Unless otherwise stated, all objects are located near the Earth's surface, where = 9.80 . When a horizontal force of 340 is applied to a 68.0 box, the box slides on a level floor, opposed by a force of kinetic friction of 150 . Part A What is the magnitude of the acceleration ... 
PHYSIC 220
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... 
physics
4 packets of charges are arranged in a circle. Each packet is 90 degrees from each other. Each packet consists of 22 elementary charges associated with the nucleus of two sodium atoms. A test charge is placed in the center of the circle of packets. The distance between the ... 
physics
Two charged bodies exert a force of 0.390 N on each other. If they are moved so that they are onethird as far apart, what force is exerted? is it .390 times 3?? 
Rocks
What could the relative age of two rocks tell you about them? a. One rock is 10,000 years old, and the other is 8,000 years old. b. One rock is older than the other. c. They both have fossils in them. d. One rock is closer to the surface than the other. What would a geologist ... 
math
A council consists of 10 members.four are NDC,three are NPP and three are from other parties.if a committee of three is to be selected,find the probabilities following: I.one of each party. II.Two NPP and one from other parties. III.one from other parties and two NDC (base on ... 
Physics
Four identical masses of mass 900 kg each are placed at the corners of a square whose side lengths are 15.0 cm. What is the magnitude of the net gravitational force on one of the masses, due to the other three? 
Physics
Two electrostatic point charges of +60.0 uC and +50.c uC exert a repulsive force on each other of 175 N. What is the distance between the two charges? So let's say I use Coulomb's law would the repulsion of 175 N be considered the equivalent of the electric force? Can someone ... 
Physics HELP!!
A loudspeaker is placed between two observers who are 113m apart, along the line connecting them. If one observer records a sound level of 51.8dB and the other records a sound level of 75.8dB, how far is the speaker from each observer? Enter the longest distance first. 
math
Oregon is about 400 miles from west to east, and 300 miles from north to south. If a map of Oregon is 15 inches tall (from north to south), about how wide is the map? PLEASE HELP AND EXPLAIN IT Set up a proportion: 15/300 (the ratio of inches to miles, north to south) and x/... 
trig
the 40ft. pole is braced by , a wire from its top in a point 60ft. from its base up, snd 18° slope. how long is the wire? 
Grade 12 physics
At the beach, 3 children pull on a floating toy. Child 1 plus with a force of 15N [N 24°E], child 2 pulls south and child 3 pulls west. The net force of the toy is zero. Assume that there are no other significant forces acting on the toy. a) Calculate the magnitude of the ... 
geography
Thank You and I did some more questions. Can you check them? 1. Is the Antarctic Circle north or south of the equator? South of the equator 2. All lines of longitude are measured east and west of what imaginary line? The Prime Meridian. Ms. Sue the 9th grade Algebra question I... 
Help Physics
Two equalmass stars maintain a constant distance apart of 6.0 1010 m and rotate about a point midway between them at a rate of one revolution every 12.0 yr. (a) Why don't the two stars crash into one another due to the gravitational force between them? (b) What must be the ... 
main ideas
Scientists generally agree that Earth is getting warmer due to what's called the greenhouse effect. A greenhouse used for plants stays warm because sunlight and heat coming through the glass roof are mostly trapped. The heat doesn't radiate back into the atmosphere because it'... 
Math
A year on Mars is 686 Earth Days. (1) Which is longer, a year on Mars or a year on Earth? (2)By how many weeks is it longer? Submit two answers. Please explain how you got the answers. My 1st answer was Mars the 2nd answer I 82 1/2 weeks. Please help 
math
A floor consists of parallel planks which have a two foot width. A circular disc of diameter one foot is randomly and uniformly dropped onto the planks. Determine the probability that the disc does not touch the line between two planks. Determine also the expected distance ... 
Chemistry
Why are the alkali and alkaline earth metals more reactive than other elements on the periodic table? 
Physics
A comet with a mass of 7.95 1011 kg strikes Earth at a speed of 22 km/s. (a) Find the kinetic energy of the comet in joules. ____ J (b) Compare the work that is done by Earth in stopping the comet to the 4.2 1015 J of energy that was released by the largest nuclear weapon ever... 
Science
Give two advantages that a telescope lens or mirror of large diameter has over one of small diameter 
Math
One tire has a diameter of 7 in and another has a diameter of 12 in. What is the difference in the distance the tires make in two revolutions? I don't get the question could you explain? 
earth
how would eath's gravity effect you in space??? At what altitude does the Earth's gravity no longer have an effect on the astronauts or the space shuttle??? 
science
The gravitational pull on Jupiter is 2.5 times greater than Earth's gravitational pull. If an object weighs 10 pounds on Earth, what will it weigh on Jupiter? 
Physics
Mars has a radius of about 0.53 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars. 
physics
Mars has a radius of about 0.38 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars. 
physics
Mars has a radius of about 0.38 Earth radius and a mass of only 0.11 Earth mass. Estimate the acceleration due to gravity on Mars.' 
EnglishAccented Syllables
I don't understand how to determine how many accented syllables there are in lines of poetry... How do you tell? Example: When the north wind blows its icy air to cool the earth, 
physics
Ricardo and Jane are standing under a tree in the middle of a pasture. An argument ensues, and they walk away in different directions. Ricardo walks 25.0 in a direction 60.0 west of north. Jane walks 14.0 in a direction 30.0 south of west. They then stop and turn to face each ... 
Physics
I have tried this question over and over and not sure if the answer is 16 west or 190 south west please help. Airplane One flies due east at 250 km/h relative to the ground. At the same time, Airplane Two flies 325 km/h, 35° north of east relative to the ground. What is the ... 
physics
A 4.92E+2 kg hotair balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing +9.81E+4 J of work on the balloon in the process. At what height above the surface of the earth does the balloon have a speed of 7.... 
Precalculus
A nautical mile equals the length of arc subtended by a central angle of 1 minute on a great circle on the surface of Earth. If the radius of Earth is taken as 3960 miles, express 1 nautical mile in terms of ordinary, or statute, miles. 
college physics
Although astronauts appear weightless, they are not. They only appear weightless because they are in free fall. If a 79 kg astronaut is orbiting Earth with an orbital radius of 5.31×107 m, determine how much the astronaut would weigh. Earth's mass is 5.974 1024 kg. 
Physics
A skydiver is jumping from an airplane traveling at 10.0 m/s. The plane is 3520 m above the earth. The sky diver pulls his cord at 1760 m above the earth. Neglecting air resistance, how far does the skydiver travel horizontally before pulling the cord? 
Science
The rock cycle suggests that A)rocks are always added to Earth's mass. B)rocks are continuously being recycled into different forms. C)rocks disappear from Earth as they go underground. D)rocks always stay in the same form. My answer is A... is that right?? 
Science 10
I am doing my science 10 by correspondence and I came upon a question that puzzles me. Why are modern light microscopes called Compound microscopes. That and How would I "determine theactual size of the cells shown in the illistration if the field diameter measures 2.2 mm"??? ... 
Physics
A small metal bead, labeled A, has a charge of 26 nC . It is touched to metal bead B, initially neutral, so that the two beads share the 26 nC charge, but not necessarily equally. When the two beads are then placed 5.0 cm apart, the force between them is 4.5×10−4 N . Assume... 
mathematics
In a mathematical equation, the coefficient is A. the numeric value of the unknown that makes an equation true. B. the term brought from one side of an equation to the other by performing the opposite operation. C. a number or quantity placed before another quantity to ... 
SCIENCE
Car headlight circuit  is this possible or do I need two separate circuit diagrams? I have the following components: 12 Volt Battery, 1 x Double filament lamp, two switches (assume stay closed when switched). Draw a circuit diagram using these components which would allow: a... 
physics
Two Small sphere are given positive electrical change. When they are 40cm apart the repulsion force between them has magnitude 0.25N what the charge on each sphere if two changes are equal 
Earth Science
i need to find out how many rabbits it would take to eat 24.447,000 dandelions in 30 minutes at a rate of one dandelion in 7 seconds... any ideas how to set this up? 
Math HELP PLEASE
find an expression for the magnitude of the initial velocity that a projectile must possess in order to leave the earth when air friction is negelcted. The gravitational constant is given as G= 6.67428*10^11 m^3 kg^1 s^2 Please give lots of details in answer 
physics
Two point charges are separated by 6.4 cm. The attractive force between them is 10 N. Suppose that the charges attracting each other have equal magnitude. Rearrange Coulomb's law and find the magnitude of each charge