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 73

physics
a ferry is crossing a river. If the ferry is headed due north with a speed of 2.5 meters per second relative to the water and the river's velocity is 3 meters per second to the east, what will the boat's velocity be relative to earth? 
Physics Energy & Acceleration
A light spring with force constant 3.45 N/m is compressed by 7.92 cm as it is held between a 0.241 kg block on the left and a 0.482 kg block on the right, both resting on a horizontal surface. The spring exerts a force on each block, tending to push them apart. The blocks are ... 
Prealgebra
A pole that is 3.1m tall casts a shadow that is 1.64m long. At the same time, a nearby building casts a shadow that is 50.25m long. How tall is the building? Round your answer to the nearest meter. 
algebra 2
A flagpole at a right angle to the horizontal is located on a slope that makes an angle of 12 degrees with the horizontal. The pole's shadow is 16 meters long and points directly up to the slope. The angle of elevation of the sun is 20 degrees. Draw the triangle. Write an ... 
algebra
A flagpole at a right angle to the horizontal is located on a slope that makes an angle of 12 degrees with the horizontal. The pole's shadow is 16 meters long and points directly up to the slope. The angle of elevation of the sun is 20 degrees. Draw the triangle. Write an ... 
History
Which describes a military strategy in which two forces simultaneously attack both flanks, or sides, of an enemy formation? a.Fabian strategy b.war of attrition c.scorched earth d.pincer movement d? 
Mathematics
What metric unit would you use to measure the length of 1.a cell phone 2.a basketball court 3.a telephone pole What metric unit would you use to measure the mass of 1.a kitten 2.an orange 3.a bee 4.a horse 
Mathematics
What metric unit would you use to measure the length of 1.a cell phone 2.a basketball court 3.a telephone pole What metric unit would you use to measure the mass of 1.a kitten 2.an orange 3.a bee 4.a horse 
History PLZ HELP ASAP!!!
What is the leading theory about how early humans arrived on the American continents? (1 point)They walked from Africa to South America when those two continents were part of the same landmass. They walked from Asia to North America over a strip of land that has since been ... 
Social studies
What is the leading theory about how early humans arrived on the American continents? (1 point) They walked from Africa to South America when those two continents were part of the same landmass. They walked from Asia to North America over a strip of land that has since been ... 
physics
two objects attract each other gravitationally with a force of 2.5^10N.when they are 0.25m apart. Their total mass is 4.00kg. Find the individual mass? 
Physics  Electricity
Can you please check my answers. 1) What carries energy through wire? electrons 2) What happens to some of the energy when it moves through the wire? becomes lost due to the movement of energy requiring some kinetic energy 3) If a resistance is large, why does the wire heat up... 
ScienceHELP!!
Can you please check my answers: 1. Dalton's idea that atoms cannot be divided into smaller parts was disproved by the discovery of _________ (electrons?) 2. The description of the structure of the atom is called ______ (atomic model?) 3. In a water molecule, two atoms of ... 
science
list three differences between ions and isotopes? An ion is an atom that has at least one fewer electrons than it has protons. Thus, an ion always has positive charge. Hydrogen usually has one proton and one electron and has neutral charge. The hydrogen ion H+ has one proton ... 
help !
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 28.0 in a direction 60.0 west of north. Jane walks 10.0 in a direction 30.0 south of west. They then stop and turn to face each ... 
trig
h t t p : / / i m g 4 0 . i m a g e s h a c k . u s / c o n t e n t . p h p ? p a g e = d o n e& l = i m g 4 0 / 1 4 8 / a s d a s d y e . j p g & v i a = m u p l o a d (def of tan theta = a^1 o)a = o opposite = adjacent tan theta written with respect to the first angle ... 
Physics
Forces of 11.3N north, 19.1N east, and 14.5N south are simultaneously applied to a 4.12kg mass as it rests on an air table. What is the magnitude of its acceleration? What is the direction of the acceleration in degrees? (Take east to be 0 degrees and counterclockwise to be ... 
physics
TWO BOXES A AND B ARE LYING ON THE TABLE AND ARE CONNECTED BY A PIECE OF STRING. THE MASS OF BOX A IS 3KG AND B IS 2KG. A 10N PULLING FORCE, POINTING TO THE RIGHT IS APPLIED TO BOX X CAUSING THE TWO BOXES TO MOVE TOGETHER AT CONSTA SPEED. a) determine the net force on A & B b... 
intermediate algebra
Two supplementary angles are such that one is 14 times larger than the other. Find the two angles. (Enter solutions from smallest to largest.) 
intermediate algebra
Two supplementary angles are such that one is 14 times larger than the other. Find the two angles. (Enter solutions from smallest to largest.) 
geometry
"Two angles are complemantary.one angle measures 14 degrees lesa than twice the other.Find the measure of the two angles". I need help please... 
Physics
A hemisphere of radius r is placed on a horizontal plane and a small mass of "m" is placed on the top of the hemisphere. Find the height from the ground to the mass m,at the moment it loses it's contact with the hemisphere.And the contact is frictionless. If we take the speed ... 
Physics!
Two identical isolated particles, each of mass 1.55 kg, are separated by a distance of 30.6 cm. What is the magnitude of the gravitational force exerted by one particle on the other?  I solved it as: Fg = G(m^2/r2) = G(m/r)2 = 6.673x10^−11 Nm2/kg2 (1.55 kg... 
physics
Find the rotational kinetic energy and angular momentum about its axis of the earth due to its daily rotation. Let ME = 6 x 1024 kg, RE = 6.4 x 106 m and ùE = 1.157 x 105 rev/sec. 
physics
Find the rotational kinetic energy and angular momentum about its axis of the earth due to its daily rotation. Let ME = 6 x 1024 kg, RE = 6.4 x 106 m and We = 1.157 x 105 rev/sec. 
math
A40m deep well with radius 3.5m is dug and the earth taken out is evenly spread to form aplateform of dimension 28m by 22m.find the height of the platform. 
Physics
an earth satellite has an elliptical orbit with an eccentricity value, e=0.40 and on orbital period of 10 hours and 54.0 minutes. Find the height above the surface at its closest approach point. 
Science
4)Explain why,when a soccer ball is kicked, the action and reaction forces don't cancel each other. a)The force of the player's foot on the ball greater than the force on the ball on the player's foot. b)They act on two different objects. c)The reaction force happens after the... 
physic
What does "seven earths" as mentioned in surah alTalaq acctually mean? It means that, according to the Quran, Allah created seven heavens, each contining one earth. 
physics
Two straight conductors are 15 cm apart. If one conductor has a current of 12 A and the other has a current of 18 A, calculate the magnetic field at a point midway between the two conductors. The current in both conductors is flowing in the same direction. 
physics
Assume that if the shear stress in steel exceeds about 4.00 108 N/m2, the steel ruptures. (a) Determine the shearing force necessary to shear a steel bolt 1.40 cm in diameter. (b) Determine the shearing force necessary to punch a 1.75cmdiameter hole in a steel plate 0.690 cm... 
vocbulary studies
i have choosen korea is this a good introduction for my brief history of korean language. what is a korean language? korean is one of the worlds oldest living languages.there are about 78 million korean speakers worldwide.korean is spoken by the korean people in north korea ... 
math
A Japanese beetle has a length between 0.3 and 0.5 inch. Find two lengths that are within the given span. Write them as fractions in simplest form. 
english
Which one of the following statements is true regarding paragraphs? A. A paragraph with two main topics is called a complex paragraph B. A paragraph should have one main topic. C. A topic sentence should not be placed in the middle of a paragraph. D. The topic of a paragraph ... 
Physics
I came here earlier with this question: "A force of 20 N acts toward the west. Another force acts at the same point so that the resultant of the two forces is zero. What is the magnitude and direction of the second force?" I was wondering if someone could explain to me how to ... 
Physics (please help)
A planet is in circular orbit about a remote star, far from any other object in the universe. Which of the following statements is true? a. None of the other statements are true. b. There is only one force acting on the planet. c. There are two forces acting on the planet and ... 
Physics newton
A rocket weighs 1 x10^7 N while on the surface of the earth. The ignition of its engines results in a lift off force of 1.5 X 10^7 N a) what is the mass of the rocket. b) what is its acceleration at lift off c)How fast will it be moving if it acceleartion at this rates for 10... 
Fluid Mechanics
An ideal mixing (total volume inlet = total volume outlet) of two incompressible fluids which is between water and methanol (SG =0.85) is coming from two inlets. At inlet 1, water enter at 9 m/s and at inlet 2, methanol enter at 7 m/s. The diameter of inlet 1 and 2 is 4 cm and... 
Physics question
1.) If the curling stone was initially sliding at 2.97 m/s and stopped precisely 10.8 meters from its launch point, then the coefficient of friction (the ratio between the magnitude of the frictional force and the magnitude of the normal force) was? 3.) Two curling contestants... 
social studies
what are the advances of early culture groups in north america This question is FAR too broad. There were many, many groups of people (and therefore civilizations) that developed in what we now call North America. You'll need to decide on one or two groups to concentrate on or... 
Physics Classical Mechanics
Three smooth balls of iron of mass m and radius R are placed inside a tube of diameter 3R (see Figure). Find the magnitude of the forces (A, B, C and D) exerted by the sides of the container on each ball. Write your answers in terms of m, g and R. A= B= C= D= 
Physics
A star the size of our Sun runs out of nuclear fuel and, without losing mass, collapses to a white dwarf star the size of our Earth. The radius of our Sun is 6.96×108m , the radius of Earth is 6.37×106m . If the star initially rotates at the same rate as our Sun, which is ... 
ap physics
A star the size of our Sun runs out of nuclear fuel and, without losing mass, collapses to a white dwarf star the size of our Earth. The radius of our Sun is 6.96×108m , the radius of Earth is 6.37×106m . If the star initially rotates at the same rate as our Sun, which is ... 
physics
A star the size of our Sun runs out of nuclear fuel and, without losing mass, collapses to a white dwarf star the size of our Earth. The radius of our Sun is 6.96×108m , the radius of Earth is 6.37×106m If the star initially rotates at the same rate as our Sun, which is once... 
physics
Suppose that on earth you can throw a ball vertically upward a distance of 2.39 m. Given that the acceleration of gravity on Mars is 3.80 m/s2, how high could you throw a ball on Mars? (Take the yaxis in the vertical direction, and assume that the location of your hand is at ... 
Math 10
A trundle wheel can be used to measure the walking distance between two locations. a) If the diameter of a trundle wheel is 45 cm, how far will a person have walked when the wheel makes one full rotation? b) If a person walks for 0.7 km, how many times has the wheel rotated? ... 
History!!! Help me!! Thank you!!
1. Find a line that shows that Mr. Covey did not care that Douglass was too sick to work. (Chapter 10) 2. Find a line that shows that Master Thomas did not believe Douglass’ complaint against Mr. Covey. (Chapter 10) 3. Find a line that shows that Mr. Covey was scared of ... 
maths
three spheres of diameter 2,3 & 4cms formed into a single sphere.Find the diameter of the new sphere assuming that the volume of a sphere is proportional to the cube of diameter. 
math/algebra
solve each of the following systems by substitution. 16) 5x 2y = 5 y  5x = 3 20) 8x 4y = 16 y = 2x  4 28) 4x 12y = 5 x + 3y = 1 Step one: Solve on of the equations for one of the variables. y=2x4 Step two:Substitute the expression for the variable found in step one ... 
English
Thank you for suggesting me a website on audiobooks. Here are some sentences I'm not sure of. 1) Dr. Frankenstein can be seen as Rousseau's primitive man, detached from society and unspoilt by civilization. 2)He can also be seen as the dark side of Victor's personality, that ... 
Algebra
A 52 in. board is cut into two pieces. One piece is three times the length of the other. Find the length of the other piece. 
chemistry
1. Given that 50 grams of ice is heated at 20.0 °C to steam at 135.0 °C. i. Show the graph of the changes from ice to steam ii. Calculate the energy needed to change the ice to steam Please use these values: Heat of fusion = 334.16 J g¯1 Heat of vaporization = 2259 J g¯1 ... 
PHYSICS
AN OBJECT MASS OF 10KG IS PLACED ON AN INCLINED PLANE AT 30 degree at the horizontal calculate recreation between two su 
physics
A certain muon detector counts 600 muouns/h at an altitude of 1900m and 380/h at sea level. Given that the muon halflife at rest is 1.5×(10^6)s, determine the speed of the muons relative to Earth, assuming they all have the same speed. 
PHYSICS
the gravitational force between two masses is 500 N. What is the gravitational force if the masses are doubled and distance between them is likewise doubled? 
Social Studies
Which of the following is a serious economic problem in North Africa? A. lack of oil resources B. a decline in tourism C. unemployment** D. poor agricultural performance What language unifies much of North Africa? A. English B. French C. Moroccan D. Arabic** In which North ... 
SS helpppp plz
Which of the following is a serious economic problem in North Africa? A. lack of oil resources B. a decline in tourism C. unemployment** D. poor agricultural performance What language unifies much of North Africa? A. English B. French C. Moroccan D. Arabic** In which North ... 
physics
A 33300 lb (earth weight) rocket in outer space has two constant forces acting upon it, F1 = (166i + 392j) lb and F2 = (50i + 54j) lb. Its initial velocity is (39i + 64j) ft/s. How far is it from where it started after 33 seconds? 
physics
A 33300 lb (earth weight) rocket in outer space has two constant forces acting upon it, F1 = (166i + 392j) lb and F2 = (50i + 54j) lb. Its initial velocity is (39i + 64j) ft/s. How far is it from where it started after 33 seconds? 
Maths
Two cars travel towards each other on a 400 km stretch of road. One car travels 90 km/h and the other at 70 km/h. How long does it take before they pass each other 
physics
Here is a problem: If i have a wire that is 75.0cm long and 0.550 mm in diameter and it has a 25 kg weight attached. I am trying to find stress and i have the area but I do not know how to find the force? 
Calc
An oil refinery is located on the north bank of a straight river that is 2 km wide. A pipeline is to be constructed from the refinery to storage tanks located on the south bank of the river 3 km east of the refinery. The cost of laying pipe is $300,000 per km over land to a ... 
Math Help Please
An oil refinery is located on the north bank of a straight river that is 2 km wide. A pipeline is to be constructed from the refinery to storage tanks located on the south bank of the river 6 km east of the refinery. The cost of laying pipe is $400,000 per km over land to a ... 
Chemistry
An atom contains a total of 25 electrons. When the atom is in the ground state, how many different principal energy levels will contain electrons? a. 1 b. 2 c. 3 d. 4 I really don't get this because I thought energy levels went like 2, 8, 18, 32, and 50, but 25 is between 18 ... 
physics
One gram of nickel has 1.026 × 1022 atoms, and each nickel atom has 28 electrons. How many electrons are contained in 9.00 g of nickel? 
physics
A screen is placed exactly one meter away from an illuminated test pattern. A lens placed between them forms a clear (focused) image of the pattern on the screen when the center of the lens is 200 mm from the test pattern. What is the focal length of the lens? ( cm) 
physics
A novice golfer on the green takes three strokes to sink the ball. The successive displacements are 3.6 m to the north, 2.8 m 45◦ north of east, and 2.2 m 59◦ west of south. Starting at the same initial point, an expert (lucky) golfer could make the hole in a ... 
physics
Suppose an airplane is flying in air with a speed of u=100m/s . The wind is from the south west with a velocity of v= 70m/s what direction should the airplane head in order to fly directly north ( with respect to the ground)? Give the angle in degrees of west of north what is ... 
3D Coordinates Polar coordinates Precalculus Trig
The U.S.S. Lollipop is on assignment in the Atlantic Ocean. It travels from a longitude of 70 degrees west to 20 degrees west, along the latitude of 40 degrees north. How far does it travel? (Assume that the radius of the Earth is 6,400 km.) Erm I don't know how to solve this... 
physics
two movers have to lift a refrigerator into a truck. one of the movers wants to life 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 1.5m, the length of the ramp is 5.0m, ... 
physics
a spring is stretched 5*10^2m by a force of 5*10^4N.a mass of 0.001kg is placed on the lower end of the spring.after equilibrium has been reached, the upper end of the spring is moved up and down so that the external force acting on the mass is given by F(t)=20coswt.calculate... 
physics
In the figure below, two point particles are fixed on an x axis separated by a distance d. Particle A has mass mA and particle B has mass 4.00mA. A third particle C, of mass 96.0mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at what x ... 
chemistry
THe thiocyanate ion acts as a Lewis base, donating a pair of electrons to the Fe ^ 3+ ion. Both sulfur and nitrogen atoms have lone pair electrons that can potentially be donated. Therefore, ther are two different structures (linkage isomers) that can be created when Fe(H2O)6... 
phys
A plane takes off at St. Louis, flies straight to Denver, and then returns the same way. The plan flies at the same speed with respect to the ground during the flight, and there are no head winds or tail winds. Since the earth revolves around its axis once a day, you might ... 
MagnetsPhysics
I have a few questions that I am not too sure of. why is it inadvisable to make a horseshoe magnet from a flexible material? is it because it would have enough magnetism Do the poles of a horseshoe magnet attact each other? If you bend the magnet so that the poles get closer ... 
Chem 1
Given the bond energy data below, which is the best prediction for the bond energy of the bond between the nitrogen and the oxygen atom in N2O? bond energy (kJ/mol) NO single bond 201 NO double bond 607 Indicate if it will be the single bond, double bond or an intermediate ... 
earth
#33 When conducting an experiment that deals with boiling chemicals, which of the following pieces of equipment would be most important to protect you from being injured? a. fire blanket b. eye wash c. tongs d. goggles I cant decide between c and d because your eyes do need to... 
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 22.0 in a direction 60.0 west of north. Jane walks 10.0 in a direction 30.0 south of west. They then stop and turn to face each ... 
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 28.0 in a direction 60.0 west of north. Jane walks 11.0 in a direction 30.0 south of west. They then stop and turn to face each ... 
physical
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 28.0 in a direction 60.0 west of north. Jane walks 16.0 in a direction 30.0 south of west. They then stop and turn to face each ... 
math
List the ages of two people in your life, one older than you and one younger than you. It would be best if the younger person was 15 years of age or younger. Find the prime factorizations of your age and the other two persons’ ages. Show your work listed by name and age. ... 
math question
Problem Find an approximate value for the rate at which the moon orbits the earth. Assume that the moon’s orbit is circular. 
Physics
Observing electron interference through an ordinary macroscopic twoslit experiment would be extremely difficult and would require very slowly moving electrons. (Slow for an electron means < 10^3 m/s.) How slowly would electrons have to move through slits spaced 6.53... 
physics
a 1500kg car travelling east with a speed of 20m/s collides at an intesection with a 2500kg van travelling south at a speed of 15m/s.The vehicle undergoes a perfectly inelastic collision, and the wreckage slides 6m before coming to rest.Find the magnitude and direction of the ... 
math
I have 14 questions and I was wondering if someone could check my answers. This is a do or die situation. If I don't get an A, I may not get to graduate. I really appreciate you taking your time to double check theses for me. Thanks if you do. I know its a lot. They are all ... 
statistics
If Z is a standard normal variable, find the probability that Z lies between 1.10 and 0.36 Use the table of the area under the normal distribution in the back of your statistics textbook to find the area between these Z values and the mean. Since they are both on the ... 
physics
A 64.0 kg person stands on a lightweight diving board supported by two pillars, one at the end of the board, the other 1.20 m away from the end. The pillar at the end of the board exerts a downward force of 829 N. How far from the pillar at the end of the board is the person ... 
Chemistry (Electrons in Atoms)
True or False. 1)Electrons give off light as they drop to lower energy levels. 2)Electrons travel around the nucleus as waves. 3)A photon of low frequency light has more energy than a photon of high frequency light. 4)Orbitals with equal energy levels each contain one electron... 
Physics
A 2kg mass, m1 and a 10 kg mass, m2 are in contact on a horizontal frictionless surface. a constant horizontal force 13.7 N in the positive X direction is applied to m1 and a constant horizontal force 10.7 N in the negative X direction is applied to m2. the masses stay in ... 
precalculus
one solution of x^35x^2+5x1=0 is 1. find the other two solutions. 
maths
the product of two integers is 160.if one of them is 8,find the ?other 
maths
The sum of two numbers one of which is 3/4 of the other is 84 . Find the number 
Physics
I have no idea!!! A river flows due south with a speed of 2.30 m/s. A man steers a motorboat across the river; his velocity relative to the water is 4.50 m/s due east. The river is 900 m wide. In which direction should the motorboat head in order to reach a point on the ... 
Physics
What are differences and similarities of the electric charges (+ and ) and the magnetic forces (North and South)? 
geography
Latitude lines measure distance in degrees north and south of this? is it equator? 
English 3
Believed in the importance of education The NorthPuritanism The SouthGentlemen Planters 
8th grade
the distance of a region north or south of the equater in degrees is called? 
7th grade
do monsoons affect the climates of both north and south korea? 
physics
If you move 10 km North, 10 km East, and 10 km South, a) What is your displacement? b) What is the total distance you traveled? 
Someone good is History!!!!!!
What effect did the Emancipation Proclamation have on the North and South?