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 60

ChemistryBonding
Classify the following bonds as ionic, covalent, or neither (O, atomic number 8; F, atomic number 9; Na, atomic number 11; Cl, atomic number 17; U, atomic number 92). a.) O with F _________ b.) Ca with Cl __________ c.) Na with Na _________ d.) U with Cl __________ First, I do... 
Science
When are tides in earth's oceans the highest? A. during the moon's waning gibbous phase. B. during the moon's waxing gibbous phase C. when the moon is at a right angle to the sun*** D. when the sun, Earth, and moon are in line 
Earth Science
which two criteria must be met before scientists can use radiocarbon dating? I need serious help dudes lol 
Physics
I'm doing a project concerning space travel to Mars, and I need some help with calculations. This is the description of the assignment: After completing Assignment 1 we realized that our small spacecraft needs to travel at over 7 km/s to keep orbiting rather than spiraling ... 
Math Pythagorean
A hiker goes 3 miles north, 2 miles east, one mile south, 4 miles east and then 2 miles north. After an injury, he sends his coordinates to a helicopter rescue team. If the helicopter starts at the same place as the hiker did, and it flew in a straight path to the hikers ... 
physics
at what height above the earth's surface in a circular orbit have to travel in order to have an orbital period half that of a geosynchronous satellite's period? (a geosynchronous satellite orbits above the equator so that it is above the same location on the earth's surface at... 
algebra
The weight of an object follows the equation w=Cr^2, where C is the constant and r is the distance the object is from the center of the earth. a. solve the equation for r. b. Suppose the object is 100 pounds when at sea level. Find the value of C that makes the equation true... 
science
I was given a systems equation. Two masses are on a flat frictionless surface tied together. There is a pulley type thing and another mass is hanging over the edge of the table. It is attatched to the other 2 masses. It has no Fn, only Fg because it is hanging. So I draw lines... 
Science
Which of the following is NOT a common landform caused by the passing of a glacier? Drumlins Esker Moraine Steppe ******************** There are sometimes flowing rivers within a glacier. True *************************** False Glaciers form and grow when the snowfall from one ... 
Math
The Andromeda Constellation is the furthest object we can see with the unaided eye. It is about 22,000,000,000,000,000 km from Earth. Light travels in space at a speed of about 300,000 km/s. Calculate how many years light takes to reach Earth from the Andromeda Constellation? ... 
Physics
GPS can be used to determine positions with great accuracy. The system works by determining the distance between the observer and each of the several satellites orbiting Earth. If one of the satellites is at a distance of 20,000 km from you, what percent accuracy in the ... 
PHYSICS
You are camping with two friends, Joe and Karl. Since all three of you like your privacy, you don't pitch your tents close together. Joe's tent is 23.0 from yours, in the direction 25.5 north of east. Karl's tent is 38.5 from yours, in the direction 34.0 south of east.What is ... 
kuwait
You are camping with two friends, Joe and Karl. Since all three of you like your privacy, you don't pitch your tents close together. Joe's tent is 19.5 from yours, in the direction 21.5 north of east. Karl's tent is 41.0 from yours, in the direction 41.0 south of east. What is... 
kuwait
You are camping with two friends, Joe and Karl. Since all three of you like your privacy, you don't pitch your tents close together. Joe's tent is 16.0 from yours, in the direction 22.0 north of east. Karl's tent is 39.5 from yours, in the direction 39.5 south of east. What is... 
geography
1. In what direction does the Nile River flow? The river flows North. 2.Paris,France, is southeast of the itersection of ? degree(s) longitude and ? degree(s) latitude? 0 degrees longitude and 50 degrees latitude 3. Does Mexico have more coastline on the Gulf of Mexico or on ... 
Science ~CHECK MY WORK PLEASE~
A scientist is trying to determine the identity of an element. It is highly reactive in water and forms an ionic bond with chlorine. It is also very shiny. The element is likely A. From Group 17 ********** B. From Group 1 C. From Group 15 D. A Noble Gas Which is most likely to... 
Physics
A student bikes to school by traveling first d_N = 1.10 miles north, then d_W = 0.500 miles west, and finally d_S = 0.200 miles south. You will now find the same quantity algebraically, without the need to use much geometry. Take the north direction as the positive y direction... 
Physicsplease help!!
A hydrogen atom, when vigorously perturbed, can emit light with a frequency of 6.16·1014 Hz. When the same light from hydrogen atoms in a distant galaxy is observed on earth, the frequency is 5.76·1014 Hz. Calculate the speed at which the galaxy is receding from the earth (... 
Physics
Two blocks of masses 40.0kg and 20.0kg are stacked on a table with the heavier block on top. The coefficient of static friction is 0.600 between the top and bottom blocks and 0.300 between the bottom block and the table. What is the required magnitude of a horizontal force ... 
physics
Two identical charges, each 8.00 x 105 C, are separated by a distance of 25.0 cm. Find the electric force between them? 
college physics 2
A healthy astronaut's heart rate is 60 beats/min. Flight doctors on Earth can monitor an astronaut's vital signs remotely while in flight. How fast would an astronaut be flying away from Earth if the doctor measured her having a heart rate of 28 beats/min? 
Precal.
If object is thrown upward with an intitial velocity of 15 ft per second, then its height is given by h=15t^2 + 60t. What is the maximum height? Two ways to find it. 1) AT the top, max height, will be one half of the time it would come back down and hit the earth at h=0 0=... 
diffirential calculus
a pole 27ft long is carried horizontally along a corridor 8ft wide and into a second corridor at right angles to the first. how wide must the secon corridor be? 
Physics
What is the gravitational force between two 10 kg iron balls separated by a distance of 0.1 m? How does this compare with the weight of one ball? 
spheres
Find the Volume of a hemisphere with a diameter of 17 cm. Use pi = 3.14 and round to the nearest hundredth. can some one show me what i'mdoing wrong? this is what i got: 4/3*3.15*17^3 you forgot to split the diameter in half to get the radius. You used the diameter in the ... 
biology  natural selection
Which of these is the foundation for relative dating? A. Earth is very old. B. Deeper rock strata are older. C. Radioisotopes decay at a constant rate. D. Organisms can be closely related to each other. 
Math
Someone please explain these! The angle between two planes is defined as the angle between their normals. Determine the angle theta between 0 and 90 degrees between the given planes. a) 2x+3yz+9 = 0 and x+2y+4 = 0  If the positive z... 
Math
Someone please explain these! The angle between two planes is defined as the angle between their normals. Determine the angle theta between 0 and 90 degrees between the given planes. a) 2x+3yz+9 = 0 and x+2y+4 = 0  If the positive z... 
Math
Someone please explain these! The angle between two planes is defined as the angle between their normals. Determine the angle theta between 0 and 90 degrees between the given planes. a) 2x+3yz+9 = 0 and x+2y+4 = 0  If the positive z... 
Physics
You and your friends are doing physics experiments on a frozenpond that serves as a frictionless, horizontal surface. Sam,with mass 80.0 kg, is given a push and slides eastward. Abigail, with mass 50.0 kg, is sent sliding northward. Theycollide and after the collision, Sam is ... 
physics
Two horses pull horizontally on ropes attached to a tree stump (Fig. 3). Each horse pulls with a force of magnitude F. If the angle between the two ropes is 126O, what is the resultant force? 
physics
Three masses are aligned along the x axis of a rectangular coordinate system so that a 2 kg mass is at the origin, a 3kg is at (2,0) m, and a 4 kg mass is at (4,0) m. Find (a) the gravitational force exerted on the 4 kg mass by the other two masses and (b) the magnitude and ... 
Geometry
1. Find the diameter of a circle with a circumference of 50 mm. Round your answer to the nearest tenth. a) 16.0 mm b) 26.4 mm c) 8.4 mm d) 33.5 mm 2. Find the area of the circle with the given radius or diameter. Round your answer to the nearest tenth. Diameter = 42.0 mm a) ... 
Math
3.)Find the diameter of a circle with a circumference of 50 mm. Round your answer to the nearest tenth. A.)16.0 mm B.)26.4 mm C.)8.4 mm d.) 33.5 mm 4.)Find the area of the circle with the given radius or diameter. Round your answer to the nearest tenth. Diameter = 42.0 mm a) ... 
Physics drwls please help
The drawing shows a collision between two pucks on an airhockey table. Puck A has a mass of 0.021 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.041 kg and is initially at rest. The collision is not head... 
Physics
The Russell Traction System To immobilize a fractured femur (the thigh bone), doctors often utilize the Russell traction system illustrated in the figure. Notice that one force is applied directly to the knee, F_1,while two other forces, F_2 and F_3 are applied to the foot. ... 
Please help!!!!!Physics
Find the resultant force on (a) the mass m1 = 0.183 kg and (b) the mass m2 = 0.106 kg (the masses are isolated from the earth).. The first mass is 400kg and its 10 cm from the second mass which is 0.183 kg (m1). the second mass is 10 cm away from the third mass which is 0.106 ... 
Physics
A sphere of radius R has inhomogeneous charge distribution on its surface. Its surface charge density is σ = σ0 cos θ, where σ0 is a positive constant, and θ is the angle from the “north pole” to the point of interest and satisfies 0 ≤ θ... 
8th grade
draw a diagram showing the motion of a satellite around Earth. Draw the force vectors acting on the sattelite. Is the sattelite accelerating? 
Physics!!!!
Assume that a scale is in an elevator on the earth. What force would the scale exert on a 53 kg person standing on it when the elevator slows at 1.77 m/s2 while moving upward? 
Physics
A rocket that weighs 7840 N on earth is fired. The force of propulsion is + 10 440N. Determine a) the mass of the rocket, b) the acceleration of the rocket, c) the velocity of the rocket at the end of 8.0 s. 
chemistry
Which of the answers choices best describes John Dalton's contribution to atomic theory? he discovered to nucleus he gave future scientist a foundation for understanding how electrons move. he gave future scientist a foundation for understanding how atoms make up matter. he ... 
Earth Science
an evidence is a material or data that can be measured and tested to verify their prediction so wat is the difference between evidence and scientific inquiry\ plz help and thank you 
Chemistry
How would I figure out how far the distance in kilometers between the sun and earth be if it takes 8.3 minutes for light to travel? (Light travels at 3.00 x 10^8) 
Chemistry
Atom A 6 protons, 6 electrons, 7 neutrons Atom D 6 protons, 6 electrons, 8 neutrons Atom X 7 protons, 7 electrons, 8 neutrons Atom Z 8 protons, 8 electrons, 9 neutrons Which two atoms are isotopes of the same element? a. A and D b. A and Z c. X and D d. X and Z How am I ... 
physics
A hydrogen atom, when vigorously perturbed, can emit light with a frequency of 6.16 × 1014 Hz. When the same light from hydrogen atoms in a distant galaxy is observed on earth, the frequency is 5.21 × 1014 Hz. Calculate the speed at which the galaxy is receding from the ... 
chemistry
1.what is meant by atomic number of an element? 2.the mass number of an element is 18,it contains 7 electrons.what is the number of protons and neutrons in it?what is the atomic number of the element? 3.an element has an atomic number of 11 and its mass number is 23?what is ... 
History
Which of these was the MOST important result of the deaths of much of the Indian population in South America? A) The importation of slaves from Africa B) The removal of the Jesuits from South America C) The call for an end to colonization of the Americas. D) The search to ... 
Algebra
two ships leave the same port at the same time. One travels north at 12 miles per hour. The other travel west at 5 miles per hour. After four hours, how far apart are the two ships? 
Physics
A uniform 100N pipe is used as lever. Where the fulcrum (the support point) must be placed if a 500N weight at one end is to balance a 200N weight at the other end? What is the reaction force exerted by the support on the pipe? 
Physics
A charge of +2uC is placed at one end of a meter stick, a charge of 2uC is placed at the other end. Calculate the electric field strength at the 50 cm mark 
physics
An airplane is flying above the Earth's surface at a height of 10.9 km. The centripetal acceleration of the plane is 16.7 m/s2. What is the angular velocity of the plane moving in uniform circular motion? Take the radius of the earth to be 6400 km. Please help, I've tried ... 
History
Which describe major achievements of Ferdinand Magellan’s exploration efforts? (Select all that apply.) Magellan proved the earth was round and could be sailed. Magellan proved the earth was much larger than expected. Magellan discovered the Incan Empire in Peru. Magellan ... 
PHYSICS  urgent
assuming there's no friction of, if two balls (one heavier than the other) are held up the same distance from the ground; the heavier ball will have more G.P.E than the lighter one, n when both are dropped, all the G.P.E can only change to K.E, as there's no friction; wot i'm ... 
physics
A projected space station consists of a circular tube that will rotate about its center (like a tubular bicycle tire) as shown in the figure . The circle formed by the tube has a diameter of about 1.1 km. What must be the rotation speed (revolutions per day) if an effect equal... 
physics.
MultipleConcept Example 3 provides some pertinent background for this problem. Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of ... 
Physics
MultipleConcept Example 3 provides some pertinent background for this problem. Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of ... 
physics
It has been suggested, and not facetiously, that life might have originated on Mars and been carried to Earth when a meteor hit Mars and blasted pieces of rock (perhaps containing primitive life) free of the surface. Astronomers know that many Martian rocks have come to Earth ... 
physics
How would you calculate the diameter of an oil molecule.A droplet of oil of given volume (cm cubed)is dropped onto a surface of water and spreads to fill area (cm square).The thickness of water is equal to the diameter of the molecule.Is there a formula to used to find this ... 
physics
A 14.7 kg crate is pulled up a rough incline with an initial speed of 1.5 m/s. The pulling force is 124.0 N parallel to the incline, which makes an angle of 11.0 ◦ with the horizontal. The coeﬃcient of kinetic friction is 0.31 and the crate is pulled a distance of... 
Calculus
An observer stands at a point P, one unit away from a track. Two runners start at the point S in the figure and run along the track. One runner runs 2 times as fast as the other. Find the maximum value of the observer's angle of sight è between the runners. Thank you so much! 
physics
On average, the electron and proton in a hydrogen atom are separated by a distance of (5.3 x 10 11 m), assuming the orbit of the electron to be circular, (a) what is the electric force on the electron? and (b) WHat is the electrons orbital speed? and (c) What is the magnitude... 
english help!!?!?
Mom smiles sweet as cold cash at each salesman in the carpet & dapery store where they offer my sister & me white mints fat as mushrooms while we walk up and down the aisles trying to make earth match the sky. What does the narrator mean when she says “make earth match the ... 
BIOLOGY/EARTH SCIENCE
Hi, I was just wondering how an eroding dune and a noneroding dune would differ, in terms of diagrams. For example, is there any site that would compare two crosssectional shapes of the dunes? I couldn't find any on google. 
earth science repost!!!
Hi, I was just wondering how an eroding dune and a noneroding dune would differ, in terms of diagrams. For example, is there any site that would compare two crosssectional shapes of the dunes? I couldn't find any on google. 
Social Studies
I need to list 10 countries in the North and 10 countries in the South during slavery times. Can't find anything. Please help. Thank you. 
physics
Forces of 86 N east, 23 N north, 46 N south, 55 N west are simultaneously applied to a box of mass 13.8 kg. Find the magnitude of the box's acceleration? 
Science
A person moves 30m north, then 20m east and finally 30 root 2m south west. Find the displacement of the person. 
maths
Iam stuck with this question.Please anyone help me. An airplane is flying at an altitude of 10,000m.The pilot sees two ships A and B.Ship A is due south of P and 22.5km away(in a direct line).Likewise ship B is due East and 40.8km from P. The height is 10km. Find the distance ... 
phy
A force of magnitude 7.50 N pushes three boxes with masses m_1 = 1.30 kg,m_2 = 3.20 kg, and m_3 = 4.90 kg .The mass is side by side. 1Find the magnitude of the contact force between boxes 1 and 2, and 2Find the magnitude of the contact force between boxes 2 and 3. *the ... 
Earth Science
Why is a minimum of three seismic stations needed to find the epicenter of an earthquake? 
Earth Science
Why is a minimum of three seismic stations needed to find the epicenter of an earthquake? 
spanish
does anyone know the story called " What ought a man to do on earth" It is from penn foster. Can I find it on the Internet if so where 
Earth Science
need to find the mystery phrase made from the following letters DNALFOSSERGORPEGA 
physics
a polar satellite is launched at 850 km above Earth .find its orbital speed. 
physics (Newton's Laws)
One end of a spring is attached firmly to a wall, and a block is attached to the other end. When the spring is fully compressed, it exerts a force F on the block, and when the spring is fully extended, the force it exerts on the block is −F. What is the force of the ... 
PreAlgerbra
I don't really understand this and my teacher at school is no help. Can anyone explain what I'm supposed to do here?  Atoms contain charged particles called protons and electrons. Each proton has a charge of +1, and each electron has a charge of –1. A sulfur ion has 16 ... 
Math
Make a picture of: a model of the earth, a stop sign, a dinner plate and a clock. Which one doesnt belong? Why? 
earth science
Which one of the following is not left in the land as a result of continental glaciers? A. Erratics B. Drumlins C. Loess D. Eskers 
Math
Two planes leave New Orleans at the same time. Plane A heads north and Plane B heads south. After 4 hours and 15 minutes, the two planes are 4568.75 miles apart. Also, Plane A is traveling 53 mph faster than Plane B. At what speeds are the two planes traveling at? How far did ... 
physics repost
Three masses are aligned along the x axis of a rectangular coordinate system so that a 2 kg mass is at the origin, a 3kg is at (2,0) m, and a 4 kg mass is at (4,0) m. Find (a) the gravitational force exerted on the 4 kg mass by the other two masses and (b) the magnitude and ... 
Materials Science
The atomic radii of Mg2+ and F1 ions are 0.072 and 0.133 nm, respectively. (a) Calculate the force of attraction between these two ions at their equilibrium interionic separation (i.e., when the ions just touch one another). (b) What is the force of repulsion at this same ... 
MATH116
Two forces of magnitudes 60 Newtons and 80 Newtons make an angle of 30 with each other and are applied to an object at the same point. Find the following: 1. the magnitude of the resultant force, and 2. to the nearest degree the angle it makes with the force of 60 Newtons. 
math
the distance between DELHI TO Meerut is 75km two trains speed of 100km/h & 80 km/h leave the two station at 8am towards each other at what time will they pass each other 
Science
Give two advantages that a telescope lens or mirror of large diameter has over one of small diameter. Not positive on this, but possibly a wider field of view? DUUUUUUUUUUUUUUUUUUUUHHHHHHHHHHHHHH This is soooooooooooooooooooooooooo easy Mike is an idiot Look in your book! see ... 
BAA App. Essay Help! (please read!)
One of my personal achievements has to do with artistic. When I was in the 7th grade I participate in the 2012 Reflections Competition. The theme was "Diversity Means...". I decided to do visual arts. In my art work, I drew a huge earth and on top of the earth I drew five ... 
Physics
In a fireworks display a 3 kg body moving at 4 km/h due north explodes into three equal pieces: A, at 4 km/h east; B, at 5 km/h 37 degrees south of west; and C, at 15 km/h due north. After the explosion, what is the total momentum of all the pieces? 
physics
Two trains 200m and 300m are running towards each other at 50km/hr and 40km/hr respectively and the distance between the two trains is 12km. In how many minutes will the two trains cross each other.? 
math
if A (2, 1) and B (4,7) are endpoints of a diameter of a circle, what is the area of the circle? a)16pi b) 17pi c) 18pi d)144pi e)1156pi Plot the two points and join 'em with a line. Now plot another point C (4, 1). And then simply run a line from B down to the new point and... 
math nid this asap tyy
(Velocity and acceleration.) The acceleration of gravity on the surface of the Moon is a = 1.6 m/s2, as opposed to g = 9.8 m/s2 on Earth. An Olympic highjumper can jump to about 2.35 m on the surface of the Earth. What height could an Olympic highjumper reach on the surface ... 
Science
A meteorite is DIFFERENT from a comet mainly because has a tail of ice and dust enters the earth's atmosphere*** has a nucleus made of snow and rock is found in the orbit between Mars and Jupiter 
physics/ math
A student bikes to school by traveling first d_N = 1.10 {miles} north, then d_W = 0.500{miles} west, and finally d_S = 0.200 {miles} south. You will now find the same quantity algebraically, without the need to use much geometry. Take the north direction as the positive y ... 
physics
piston 1 has a diameter of 0.25 in; pistol 2 has a diameter of 1.5 in. In the absence of friction, determine the force necessary to support the 500 lb weight. 
Earth Science
15. Which statement best describes the composition of magma? A. Magma is an element all its own.B. Magma contains the same elements as snow.C. Magma contains only three elements.D. Magma contains the same elements as Earth's crust. 
Math
A 20 m vertical telephone pole is standing on a 15 degree slope. One guy wire is attached 30 m up the slope and another guy wire is attached 30 m down the slope. What is the length of the guy wire attached down the slope? I don't understand the question or what the diagram ... 
physics(universal law of gravitation)
a satellite has a mass of 100 kg and is located at 2 x 10^6 m above the surface if the Earth. wHAT is the potential energy associated with the satellite at this location? What is the magnitude of the gravitational force on the satellite? 
maths
Q1) Paul brought a car last year. It has lost 12½% of its value since then. It is now valued at £10,500 How much did Paul pay for his car? [I got £11812.50... Is that right?~xD] Q2) A newspaper report stated: "Concorde has flown 7.1x10^7 miles. This is equivalent to 300 ... 
Science
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ... 
Physics
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ... 
science
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...