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.
227,364 results, page 60

Physics
In the hydraulic system shown in the figure, the piston on the left has a diameter of 4.5cm and a mass is 3.0kg. If the density of the fluid is 710kg/m^3 , what is the height difference h between the two pistons in m? I checked the other similar questions like this and tried ... 
physics
1.An elastic cord is 5.0m long and 1.0cm in diameter and acts as a spring with spring constant 70 N/m, what is the young's modulus for this material? 2.A heavy uniform beam of mass 8000 kg and length 2.0m is suspended at one end by a nylon rope of diameter 2.5 cm and at the ... 
physics
two boys start running straight towards each other from two points that are 100m apart. one runs with a speed of 5m/s, while other moves at 7m/s.how close are they to the slower one's starting point when they meet? 
chem 101
In an electron microscope the electrons generate the image. For one of the scanning electron microscopes in our Central Analytical Facility, the electrons are accelerated to have a kinetic energy of 200,000 eV. Electrons with this kinetic energy have a velocity of 2.67 x 10^8 ... 
math
these marbles are placed in a bag and two of them are randomly drawn what is the probability of drawing two pink marbles if the first one is placed back in the bag before the second draw the bag has 10 marbles.2 yellow.3 pink.5 blue 
Math
these marbles are placed in a bag and two of them are randomly drawn what is the probability of drawing two pink marbles if the first one is placed back in the bag before the second draw the bag has 10 marbles.2 yellow.3 pink.5 blue 
Math
1) A plane is located at C on the diagram. There are two towers located at A and B. The distance between the towers is 7,600 feet, and the angles of elevation are given. a) find BC, the distance from Tower 2 to the plane, to the nearest foot. b) find CD, the height of the ... 
English
1. I have seven balls. One is white, another is black, a third is blue, a fourth is green, a fifth is brown, a sixth is pink, and the other is orange. (Is this sentence grammatical and commonly used? 2. I have two balls: One is green and the other is yellow. 3. I have two ... 
Physics
A boy travels 8km north, 3km east and then 5km south. Find the magnitude of displacement of the boy 
college alg.
The height of a projectile fired upward is given by the formula s = v0t − 16t2, where s is the height, v0 is the initial velocity, and t is the time. Find the time for a projectile to return to Earth if it has an initial velocity of 184 ft/s. ____________ s 
Science
The words to use are: crust, moving, lithosphere, asthenosphere, upper mantle, volcanoes, semisolid The ___1___, which includes the ___2___ and part of the ___3___, is divided into plates that carry all of Earth's lands and oceans. These plates float on a ___4___ layer of rock... 
Sunset
At noon, ship A is 50 miles north of ship B and is headed south at 16mph. Ship B is headed west at 12 mph. At what time are they closest together, and what is the minimum distance between them? 
Physics
Your car is stuck in the mud and two friends are helping you. One is pulling on your car with a force of 370 N at a 40 degree angle and the other is pulling with a force of 450 N at a 30 degree angle. A force of 725 N is required to remove the car. Is the car still stuck? ... 
Science
When two hydrogen atoms bond with one oxygen atom to form water, what happens to the electrons? A. Each hydrogen atom donates its electron to the oxygen atom. B. The oxygen atom donates an electron to ach hydrogen atom. C. A pair of electrons is shared at each of the hydrogen... 
Science
When two hydrogen atoms bond with one oxygen atom to form water, what happens to the electrons? A. Each hydrogen atom donates its electron to the oxygen atom. B. The oxygen atom donates an electron to ach hydrogen atom. C. A pair of electrons is shared at each of the hydrogen... 
please help  area of a dodecagon?
The distance between two opposite vertices of the dodecagon is 2. Find the area of the dodecagon. first, what is the area of a dodecagon and second how to find it with just the distance between two oppositve vertices. i found that a dodecagon can be divided into 24 triangles: ... 
we the people
For my homework i was given this: find an example when each of the 3 branches of the national government has checked one of the other 2. i cant find anything on the internet 
physics
Two equally long 12cm diameter pipelines have the same pressure difference between ends. One carries a ‘Type A’ oil (𝜂 = 0.091 Pa s) and the other a ‘Type B’ oil (𝜂 = 0.064 Pa s). If ‘Type A’ oil flows at 0.14 m3/s, at which rate ... 
PHYSIC
A ferryboat transports tourists among three islands. It sails from the first island to the second island, 4.38 km away, in a direction 37.0° north of east. It then sails from the second island to the third island in a direction 76.5° west of north. Finally, it returns to the... 
Physics
A ferryboat transports tourists among three islands. It sails from the first island to the second island, 4.38 km away, in a direction 37.0° north of east. It then sails from the second island to the third island in a direction 76.5° west of north. Finally, it returns to the... 
SolvedCalculusPlease check?
the equatorial radius of the earth is approximately 3960 miles. suppose a wire is wrapped tightly around the earth at the equator. how much must this wire be lengthened if it is to be strung on 10 feet poles above the ground? (1 mile=5280 feet) delta y= dy/dx (2pir) * deltax ... 
em
Answers for Two Forces Act At Angle Of 120 Degrees The Bigger Force Is 60 Degree M And Resultant Is Perpendicular To The Smaller One Find The Smaller Force 
Phsyics Waves
Earthquakes are essentially sound waves traveling through the earth. They are called seismic waves. Because the earth is solid, it can support both longitudinal and transverse seismic waves. These travel at different speeds. The speed of longitudinal waves, called P waves, is ... 
Math: i do not understand
A tractor manufacturing company machines axles to extremely small tolerances. The main power axles have a mean diameter of 3.0000 inches and a standard deviation of 0.0050 inch. What is the probability that a given axle will have a diameter between 2.9915 and 3.0004 inches? ... 
Science
[I picked d.] How many species are estimated to be living on earth? a.between 10,000 and 1,000,000 b.between 500,000 and 1 million c.between 1 and 5 million d.between 10 and 50 million http://faculty.plattsburgh.edu/thomas.wolosz/howmanysp.htm This is a political, not ... 
geography
Which statement best describes the location of south west Asia ? A. north of Australia and west of Europe B. west of the Indian Ocean and east of the Mediterranean Sea C. south of the Arctic Circle and north of Antarctica. D. east of the Americas and west of Asia According to ... 
applied math
A boat is located at a random location uniformly distributed inside of the circular pool of radius 1 mile. The boat is tied by a rope to a pole located directly at the center of the pool. A bird lands on the rope at the uniformly random location. If X is the distance between ... 
math prob
A boat is located at a random location uniformly distributed inside of the circular pool of radius 1 mile. The boat is tied by a rope to a pole located directly at the center of the pool. A bird lands on the rope at the uniformly random location. If X is the distance between ... 
Forces on Structures (Science)
What force continually changes a satellite's direction? Why doesn't a satellite need fuel to keep moving? What would be the effect on satellites now in orbit if Earth were to stop rotating? 
TO BOBPURSLEY
acceleartiononmoon= GMassmoon/radius^2 =G 7.35E22/(1.74E6)^2= G 2.43E10= = 6.67E11*2.43E10= 1.62 m/s^2 or as a gravitational field constant= 1.62 N/kg I have no idea why you used the mass of Earth. were did you get a = r^2 Gm from i thought that the equation was net force = ... 
Oceanography
I have an exam in oceanography coming up and I'm having a little trouble understanding directions. For example in my review sheet he asks question like this: In what compass direction does the coriolis force act in the following situations: An object moving west at 22 degrees ... 
classical mechanics
enturi Flow Meter (19 points possible) A Venturi flow meter is used to measure the the flow velocity of a water main. The water main has a diameter of 40.0 cm, and the constriction has a diameter of 10.0 cm. The two vertical pipes are open at the top, and the difference in ... 
physics
t(s)=0.0,1.0,2.0,3.0,4.0,5.0,6.0,7.0 v(m/s)=0.0,4.6,8.9,13.4,18.0,22.9,27.6,32.0 find the area underneath the graph between t=2.0s and t=6.0s, i know i will have to break this down into two separate shapes, a rectangle and a triangle then add them together, i just don't know ... 
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 
physics
In a tugofwar between two athletes, each pulls on the rope with a force of 270 N. What is the tension in the rope? ______ N If the rope does not move, what horizontal force does each athlete exert against the ground? ______ N is the first on 250 and is the second one 0? 
Physics
A 0.5 kg wooden block is placed on top of a 1.0 kg wooden block. The coefficient of static friction between the two blocks is 0.35. The coefficient of kinetic friction between the lower block and the level table is 0.2. What is the maximum horizontal force that can be applied ... 
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 ... 
south carolina history help me ASAP PLZZZZZ
which state voted first against independence, but eventually voted for it? new york north carolina delaware south carolina 
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... 
applied physics
two painters stand on a 10.00m scaffold. one,of mass 65.0kg, stands 2.00m from one end. the other, of mass 95.0kg, stands 4.00m from the other end. they share a paint container of mass 18.0kg located between the two and 2.50m from the larger person. what weight must be ... 
Earth Science
which two criteria must be met before scientists can use radiocarbon dating? I need serious help dudes lol 
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
A block of mass 3m is placed on a frictionless horizontal surface, and a second block of mass m is placed on top of the first block. The surfaces of the blocks are rough. A constant force of magnitude F is applied to the first block as shown in the figure. (a) Construct free... 
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 ... 
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... 
physics
Ten bags of top soil, each weighing 150 N, are placed on a L = 2.95 m long sheet of wood. They are stacked 0.50 m from one end of the sheet of wood, as shown in Figure 827. Two people lift the sheet of wood, one at each end. Ignore the weight of the wood, how much force must ... 
physics
Ten bags of top soil, each weighing 180 N, are placed on a 2.90m long sheet of wood. They are stacked 0.50 m from one end of the sheet of wood, as shown below. Two people lift the sheet of wood, one at each end. Ignore the weight of the wood, how much force must each person ... 
biomechanics
A 50 kg pole vaulter has a horizontal velocity of 8 m/s at the completion of her approach run, and her center of gravity is 1.0 m high. Estimate how high she should be able to vault if her kinetic and potential energies were all converted to potential energy. 
Science 8th Grade
What was the hiker's average velocity? Distance = 6km West Starting Time = 9:45 Ending Time = 10:45 A. 4.0 km/h south B. 0.10 km/h north C. 10 km/h south west D. 6 km/h west 
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 ... 
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... 
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 (... 
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... 
geography
Can you check my answers, please? 1. Latitude is measured north and south of what imaginary line? The Equator 2. Which of the following is not a city: Bangladesh, Tokyo, Amsterdam, New Delhi? Bangladesh 3. What is the name given to a point of land extending into a body of ... 
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? 
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 ... 
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... 
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. 
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... 
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? 
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=... 
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 ... 
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 ... 
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... 
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 ... 
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. 
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 ... 
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
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. ... 
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 ... 
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) 
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... 
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
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
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 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  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 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
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 ... 
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 ... 
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... 
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 ... 
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? 
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 ... 
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... 
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 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 
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 ... 
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 ...