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 72

physics2
A Gaussian surface encloses two charges. The total electric flux through the Gaussian surface is 8.3 x 106 N m2/C. If one of the charges is 14.9 microCoulombs and the magnitude of the electric force between them is 2.76 Newtons, what is the distance between the charges in ... 
math
A turtle starts moving north at 4 feet per minute from a point P. Five minutes later, a snail starts moving south at 2 feet per minute from a point 50 feet due east of P. What is the distance (in feet) between the two animals five minutes after the snail starts moving? 
alegebra
A turtle starts moving north at 4 feet per minute from a point P. Five minutes later, a snail starts moving south at 2 feet per minute from a point 50 feet due east of P. What is the distance (in feet) between the two animals five minutes after the snail starts moving? 
physics
Find the magnitude of the resultant of a 40 N force and a 70 N force acting concurrently when the angle between them is: a) 0.0 b) 30.0 c) 60.0 d) 90.0 e) 180.0 
economics
Each week, Bill, Mary and Jane select the quantity of two goods, x1 and x2, that they will consume in order to maximize their respective utilities. They each spent their entire weekly income on these two goods. Suppose you are given the following information about the choices ... 
3rd grade  Solor System
How many years does it take Jupiter to orbit the sun? One year on the this planet would actually be how many earth years long? 
Earth Science
As a star ages, its internal composition changes as nuclear reactions in the star's core convert one element into another. True or false? 
geography
How many miles does Argentina extend from east to west? "" north to south? 
History
How did the North, South, and West contributed to the Civil War outcome? 
physics
a bee flies 12m north, 8m west, and then 4m south, what is the displacement 
GEOMETRY
Is it true that vertical angles must be oriented northsouth? 
History
How did the Civil War affect the home front in the north and south? 
world history
what did the north and south believe about the compromise of 1850? 
Math
The ratio of North American butterflies to South American butterflies at a butterfly park is 5:3. There are 30 North American butterflies at the butterfly park. How many South American butterflies are there? 
Social studies
How are the western expansion and contrast in the north and south related? 
physics
if a body moves 3m north,then 4m East and finally 6m South.what will be the displacement? 
Science
How do you find the density of a cyclinder if you are only given the diameter, height and mass? 
Geometry
Given circle E with diameter AC and m<DAC=62 degrees, find mAD(arc). 
maths
please help A circular opaque disk, 25 cm in diameter, is set up 30 cm from a circular source of light of diameter 40 cm. A screen is placed 30 cm beyond the opaque disk. Describe, giving dimensions, the nature of the shadow on the screen 
Advance Algebra
The concentration (in milligrams per liter) of an antibiotic in the blood is given by the geometric series: A + Aekt + Ae2kt + + Ae(n − 1)kt where A is the number of milligrams in one dose of the antibiotic, n is the number of doses, t is the time between doses, and k is... 
Chem
I was asked to fraw the energy level diagram for carbon. Carbon has 6 electrons so would the 2s and 2p orbitals both be half full? 1s = 2 electrons 2s= 1 electron 2p = 3 electrons 
Physical Science
A certain metal surface emits electrons when light is shone on it. (a)How can the number of electrons per second be increased? (b) How can the energies of the electrons be increased? 
Ap physics 1
The mass of a star in a galaxy far, far away, is 3.12 × 105 Earth masses, and the mean distance from the center of this star to the center of a planet with the same mass as our Earth is 2.46 × 108 km. Treating this planet and star as particles,with each mass concentrated at ... 
Physics
The mass of a star in a galaxy far, far away, is 2.13 × 105 Earth masses, and the mean distance from the center of this star to the center of a planet with the same mass as our Earth is 7.87 × 108 km. Treating this planet and star as particles, with each mass concentrated at... 
Science
When hair is combed with a hard rubber comb, the hair becomes positively charged because the comb A. Transfers protons to the hair B. Remove electrons from the hair C. Transfers electrons to the hair D. Remove both times from the hair I could be removed electrons from hair . ... 
maths
Can someone help please? A circular opaque disk, 25 cm in diameter, is set up 30 cm from a circular source of light of diameter 40 cm. A screen is placed 30 cm beyond the opaque disk. Describe, giving dimensions, the nature of the shadow on the screen 
maths/physics
Need help..... A circular opaque disk, 25 cm in diameter, is set up 30 cm from a circular source of light of diameter 40 cm. A screen is placed 30 cm beyond the opaque disk. Describe, giving dimensions, the nature of the shadow on the screen 
SCIENCE check answers please :)
1) Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA). What was this particular time period called, and why is this time period not really considered a part of Earth’s ... 
south al
For a hypothetical normal distribution of test scores, approximately 95% fall between 38 and 62, 2.5% are below 38, and 2.5% are above 62. Given this information, (a) the mode=_____ and (b) the standard deviation=_____. 
math
a rectangular field is 750 m long and 450 m broad has two roads in middle of it,which are 5 m wide, running at right angles to each other. one is along the breadth and the other along the length .find the area 
math
the serface of our earth is 20'c for every km, k below the surface the tempature increses by 10'c. let t represent the tempature in 'c 1a write an equation that represent the relationship between disatnce k and t tempature 1b. what is the slope and and yintercept 
chem
A NASA satellite showed that in 2003 the ozone hole was much larger than it was in 2002. The 2003 hole measured 1.04 x ¡¼10¡½^7 ¡¼mi¡½^2 in diameter, while the diameter of the 2002 hole was 6.9 x ¡¼10¡½^6 ¡¼mi¡½^2 Calculate the difference in size between the ... 
math
A NASA satellite showed that in 2003 the ozone hole was much larger than it was in 2002. The 2003 hole measured 1.04 x ¡¼10¡½^7 ¡¼mi¡½^2 in diameter, while the diameter of the 2002 hole was 6.9 x ¡¼10¡½^6 ¡¼mi¡½^2 Calculate the difference in size between the ... 
Physics
A block is connected between two springs on a frictionless horizontally level track. The other end of each spring is respectively anchored to a vertical pin set at opposite ends of the track. The spring constant for one spring is k = 100N/m and the mass of the block is 0.300 ... 
physic
A steel rod of length 1.0000 m and crosssectional area 3.63·104m2 is placed snugly against two immobile end points. The rod is initially placed when the temperature is 0°C. Find the stress in the rod when the temperature rises to 38.9°C. 
memphis school
Two boats leave a dock at the same time, one goes eastward at 10miles per hour and the other goes north at 24miles per hour how miles apart are both boats after 3hours 
Math
1) A television tower is 160 feet high and an observer is 120 feet from the base of the tower. Find, to the nearest degree, the angle of elevation of the top of the tower from the point of observation. 2) A vertical pole 22 meters tall casts a shadow 16 meters long on level ... 
physics
1. what happens to the force required for an object to maintain circular motion if the period is halved (goes twice as fast around the circle)? a) force doubles b) force quadruples c) force is halved d) force is quartered 2. In a pulley problem involving an inclined plane: a) ... 
college earth science and astronomy
This isn't homework as much as I am trying to learn this on my own. I am trying to perform an experiment on solar power. I measured and recorded the volume (V= 250 mL) and mass (M= 250 g) of water in a cup. I then recorded the initial temperature(32 degrees celcius) of the ... 
Physics
You are hanging onto the end of a long rope, the other end of which is attached to a Coast Guard helicopter. Model yourself as a particle of mass M = 52.8 kg with a diameter equal to 0.540 m. The density of the air is ρ = 1.29 kg/m3. Assume the drag coefficient between you ... 
physics
Two pellets, each with a charge of 0.80 microcoulomb (8.0×10−7 C), are located 4.0 cm (4.0×10−2 m) apart. Find the electric force between them. 
chem
Please help me with these two problems: 1)How many electrons would it take to equal the mass of a proton? 2)What mass of electrons would be required to just neutralize the charge of 1.0g of protons? 
PHY 131
three forces act on a moving force object. one cforce has a magnitude of 80.O N and is directed due north. another has a magnitude of 60.0N and is due west. What must the magnitude and direction of the 3rd force, such that the object continues to move at a constant velocity. 
Phys
Three blocks on a frictionless horizontal surface are in contact with each other. A force F is applied to block A (mass mA). (a) Draw a free body diagram for each block. I've drawn it and it looks like this, but I'm not sure if I'm including everything. ^normal force F>... 
solid mensuration
a certain city block is in the form off parallelogram. two of it's side are each 225 meters long, the other two sides are each 145 meters long. if the distance between the first two pair is 80 meters. find the area of the land in the block and the length of the diagonals. 
p i s j
The mass of fan astronaut is 100kg 1)find its weight on earth. 2)find its weight on moon. When the gravitational acceleration on moon is 1.6 ms 
Physics
A 5.00kg block is placed on top of a 10.0kg block which rests on a horizontal surface. The 5.00kg block is tied to a wall with a horizontal string. A 45.0N horizontal force directed away from the wall is then exerted on the 10.0kg block. The coefficient of kinetic ... 
science
Oblique rays are different from vertical rays because they a) contain more solar energy b) strike the earth at an angle greater than 90 degrees c)spread their energy over a larger surface area d) a and b e) b and c i think between d and e 
science
Oblique rays are different from vertical rays because they a) contain more solar energy b) strike the earth at an angle greater than 90 degrees c)spread their energy over a larger surface area d) a and b e) b and c i think between d and e 
science
Oblique rays are different from vertical rays because they a) contain more solar energy b) strike the earth at an angle greater than 90 degrees c)spread their energy over a larger surface area d) a and b e) b and c i think between d and e 
Sociology
Soot plays an important role in climate change, but ______ is still the leading cause of Earth's changing climate. A. acid rain B. nitrous oxide C. carbon monoxide D. carbon dioxide I can't decide between B and D 
math
Given one side of a golden rectangle is 3.7 inches, find the possible lengths of the other side. Notice that the other side can be either longer or shorter than 3.7 inches. Round your answers to the nearest tenth and use Greek Phi symbol=1.618. 
Orbital Dynamics
The zerovelocity value of the Jacobi integral at the L2 point of the EarthMoon system is C= 1.59411. Suppose a spacecraft is newar Earth (r2=1/60 in our descriptions). Approximately waht speed must the craft have realtive to the rotating system if it is able to reach the L2... 
Orbital Dynamics
The zerovelocity value of the Jacobi integral at the L2 point of the EarthMoon system is C= 1.59411. Suppose a spacecraft is newar Earth (r2=1/60 in our descriptions). Approximately waht speed must the craft have realtive to the rotating system if it is able to reach the L2... 
Physics
Two ropes exert forces holding a suspended box having a mass of 100 N at rest. If one rope is at an angle of 30o to the horizontal and exerts a force of 40 N along the rope, what is the tension on the other rope and what is the angle between the rope and the horizontal? I was ... 
science
how is the equator similar to the prime meridian A. both the prime meridian and equator are lines that divide earth into norther and southern hemispheres B. both the prime meridian and equator are imaginary base lines from which locations of earth can be measured D. both the ... 
trig
A river is 2000 ft wide and flowing at 6 mph from north to south. A woman in a canoe starts on the eastern shore and heads west at her normal paddling speed of 2 mph. In what direction (measured clockwise from north) must she aim her canoe? How long will it take her to go ... 
trigonometry
A river is 2000 ft wide and flowing at 6 mph from north to south. A woman in a canoe starts on the eastern shore and heads west at her normal paddling speed of 2 mph. In what direction (measured clockwise from north) must she aim her canoe? How long will it take her to go ... 
trigonometry
A river is 2000 ft wide and flowing at 6 mph from north to south. A woman in a canoe starts on the eastern shore and heads west at her normal paddling speed of 2 mph. In what direction (measured clockwise from north) must she aim her canoe? How long will it take her to go ... 
Grammar
Underline the noun clause in each of the following sentences. Then identify the function by the clause. 9. Nguyen Thi Vinh's hope is (that life in her hometown has not changed too much). predicate noun. 10. I fear (that one day I'll be with the MarchNorth Army meeting you ... 
Physics
A hiker follows a route that consists of three displacement vectors A, B, and C. Vector A is along a measured trail and is 1550 meters in a direction 25 degrees north of east. The direction of Vector B is 41 degrees east of south, and the direction of vector C is 35 degrees ... 
physics
A block of mass m1 = 4.50 kg sits on top of a second block of mass m2 = 13.9 kg, which in turn is on a horizontal table. The coefficients of friction between the two blocks are µs = 0.300 and µk = 0.100. The coefficients of friction between the lower block and the rough ... 
Physics
Two forces are applied to a box on a frictionless surface. One force is 40 N [S]. The second force is 70 N [N30ºW]. What is the overall net force? a) 40.6 N [S59.5ºE] b) 110 N c) 40.6 N [N59.5ºW] d) 40.6 N [S30.5ºW] 
physics
Two bicyclists, starting at the same place, are riding toward the same campground by two different routes. One cyclist rides 1500 m due east and then turns due north and travels another 1430 m before reaching the campground. The second cyclist starts out by heading due north ... 
chemistry
Can someone please help me with this problem? An iron nail placed in a beaker with a solution of silver nitrate will cause pure silver to collect on the bottom of the beaker. Write a balanced equation for the reaction that occurs. This is what I have so far: Fe + AgNO3 >... 
algebra1
Find the product: (x + 5)2 12 Answer: Referring to the figure, find an expression for the area. 13 Answer: Use the zeroproduct property to solve the equation: (x + 4)(x  2) = 0 *NOTE: Applicable to this and all other questions For any solution that involves two answers, ... 
Physics
Some spacecraft design uses a solar sail made of aluminized plastic. As sunlight reflects off the sail, radiation pressure drives the spacecraft outward away from the sun. a. If the sail material has a density of 700.0 kg/m3, what is the maximum thickness of the sail for which... 
physics
An electric power line carries a current of 1600 A in a location where the earth's magnetic field is 4.0*105 T. The line makes an angle of 75° with respect to the field. Determine the magnitude of the magnetic force on a 130 m length of line. 
True or False?
Sounds like an easy question but I just wanna be sure! :P Tides are caused by the force of inertia from the sun and moon acting on Earth. True or False? I think its false because its gravity not inertia. 
physics
A bomber drops a bomb from an aircraft flying at 2000Km/h with an altitude of 7 Km. The speed at which the bomb will strike the earth would be. a) Greater than 2000Km/h b) Less than 2000 Km/h c) Equal to 2000 Km/h d) Can not compare with the given data 
Astronomy
Saturn’s Moon Janus is observed to orbit the planet with period 0.695 days, grazing the planet with an orbital radius only 2.64 times the radius of the planet itself. Use this information to find the mass of Saturn. Express your answer as a multiple of the mass of Earth M&#... 
Physics
Three blocks on a frictionless horizontal surface are in contact with each other A force F is applied to block 1 (m1) Draw a free body diagram for each block ok for the diagram is the force F applied horizontal to mass one does this force act on m2 all the blocks are lines up ... 
Spherical Trigonometery
I am trying to apply the formula cos c = cos a x cos b + sin a x sin b x cos C to find the length of c in my spherical triangle. I am working with 2 examples in a book in which the answers are given. In the first example all the sines & cosines calculated are positive and I ... 
physics
explain the law of motion needed to slove this problem. On Planet Zorg, a 30kg barbell can be lifted by only exerting a force of 180N. what is the acceleration of gravity on Planet Zorg? Predict how the motion of this object would change on earth. 
physics
Two spacecraft in outer space attract each other with a force of 45 N. What would the attractive force be if they were \frac{1}{5} as far apart? F_{attractive} = _____________N (no rounding up) 
Algebra
Consider the points (3, –1) and (9, 2). (a) State the midpoint of the line segment with the given endpoints. (b) Find the distance between the points. Show some work. Give the exact answer (involving a radical), and also an approximation to three decimal places. (c) Find the... 
L.A.
2.the most likely reason the author includes lines 1725 is to A:Show how the main one another. B:provide an explanation of the values and rules that existed during the time in which the play is set. C:inform the audience of Jack's secret identity before other characters fine ... 
science
The same astronaut visited Pluto. His weight on Earth was still 170 pounds, and his weight on Pluto was only 10 pounds. He removed an ice core with a weight of 25 pounds on Pluto. What is the weight of the ice core on Earth? A. 1.5 pounds B. 15 pounds C. 42.5 pounds D. 425 pounds 
Physics
The location of a car at times t1 and t2 is given by the position vectors r1= 15km due east + 20km due north (time t1) and r2= 13km due west + 25km due north (time t2) The units of distance are kilometers a. What is the magnitude l^rl of the displacement? b. What angle does ... 
Math
A Ferris wheel has a diameter of 140 feet. There are 40 cars for riders, and they are placed at even intervals around the Ferris wheel. What is the best approximation of how many feet apart the cars are placed? 
Physics
I got two questions Three blocks on a fricitonless horizontal surface are in contact with each other a force F is applied to block 1 mass m1 Draw a free body diagram for each block ok done the accelration of the system (in terms of m1, m2, and m3) ok done I got a = (m1 + m2 + ... 
science
Objects take up space and move through space different ways. Scientists use these differences to make models. For example, how a rubber band stretches helps you "see" the force acting on it. How could you use space relationships to model Earth and its moon? 
Physics
A) Gravity pulls an area of wet soil and rock downward in a landslide B) An ... Many people know that the weight of an object varies on different planets, but did ... If the Earth's gravitational force causes a falling 74 kg student to accelerate .... the acceleration of ... 
Physics
To move a large crate across a rough floor, you push on it with a force (F) at an angle of 21 degrees below the horizontal. Find the force necessary to start the crate moving, given the mass of the crate is 32 kg and the coefficient of static friction between the crate and the... 
AP Physics C
An earth satellite, the mass of which is 1000 kg, is in a circular orbit 1000 km above the surface of the earth. It is desired to transfer it to a circular orbit 1500 km above the surface. The amount of work that must be done to accomplish this is A. 3.43 * 109 J B. 1.71 * 109... 
Physics help!!
A crate is pulled to the right with a force of 80 N, to the left with a force of 125.8 N, upward with a force of 615.4 N, and downward with a force of 248 N. Net external force in the x direction: 45.8 Net external force in the y direction: 367.4 N how do i find the magnitude... 
Arithmetic
The Gardiner dam located 100 km south of Saskatoon is largest earth filled dam in the world. Upon it's opening in 1967, engineers discovered that the pressure from lake deifenbaker had moved the clay based structure 200 cm downstream. Since then, then the dam has been moving ... 
physics
At a certain undisclosed place (probably not on Earth) an Atwood's like experiment gives the graph of 1/t2 vs Δm the slope is 3.8 (in 1/(kg s2). One also knows that h=1.3m, total mass =0.8kg and I/r2 = 0.08kg. what is the gravitational acceleration is (in m/s2)? 
maths
a hiker walk due east at 4km per hour and a second hiker starting from the same point walks 55 degree northeast at the rate of 6km per hour. H ow far apart will they be after 2 hours. this is my ques but .i am having problem that if the hiker walks 55 degree north east so if ... 
physics
2.4 ampere current is flowing in a wire .how many electrons pass a given point in the wire in one second if the charge on an electron is 1.6x10 power 19 couloms. 
physics
Sonia walks due east with a speed of two m/s. Bryan walks north with a speed of two m/s. Which statement best describes the relationship between their velocities? A. Their velocities are different because their speeds are not the same. B. Their velocities are the same because ... 
Geometry
Can the following quadrilateral be proven to be a parallelogram based on the given information? No. It is not a parallelogram because the angles of the quadrilateral do not add up to 360 degrees360°. B. No. It is not a parallelogram because one pair of opposite sides is ... 
science
A cricket ball of mass 0.4 kg moving with a velocity of 72 km/h is brought to rest by a player. Find the magnitude of the average force exerted by the player? we have, F= m x a to find acceleration we want either dist(s) or time(t) it is not given how to find they have given ... 
science
a boat heading due north crosses a wide river with speed of 12km/h relative to the water the water in the river has a uniform speed of 5 km/h due east relative to the earth.determine the velocity of the boat relative to an observer standing on either bank and the direction of ... 
SS plz help me plzzzzzzz
What are the two major forces that reshape earth? Describe how itworks. plz plz plz help me there are no answer choices hope u can still help 
Honors Physics Question
Two objects are near a bar magnet. One is about 1 cm away, while the other is 6 cm away. Compare and contrast the magnetic force that affects each object. What do they want me to do? 
physics
find the drift velocity of the electrons in the copper wire (there are 8.5*10^28 free electrons per m^3 in copper) 
physics
Im trying to study for my physics exam by doing some extra problems, however im stuck with this one. any help is much appreciated Two tiny spheres have the same mass and carry charges of the same magnitude. The mass of each sphere is 4.62 x 106 kg. The gravitational force ... 
physics
Two charges, qA and qB, are separated by a distance, d, and exert a force, F, on each other. Analyze Coulomb's law and answer the following questions. (a) What new force will exist if qA is doubled? (b) What new force will exist if qA and qB are cut in half? (c) What new force... 
Science
What can scientists learn from the rate at which radioactive elements decay? A. a rock's absolute age* B. the relative age of rock layers C. where one soil horizon ends and the next begins D. the difference between molds and casts. The relative age of a rock is A, its age ...