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 54

Physics
A metallic surface emits electrons when it is irradiated with a yellow light source of power 25 Watts. What happens to the emission of the electrons if one yellow light source is replaced by two violet light sources of same power? The number of emission of electrons will ... 
science
does anybody know where i can find info. about the earth's crust? 
earth science
what instument is used to find mass 
earth
in the layer ofsedimentary rocs the oldest can be find in where 
classical mechanics
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 20.0 cm. The two vertical pipes are open at the top, and the difference in water level between them is 2.0 m. Find ... 
physics (Urgent)!!!!!!!!!!!!!!!!!!!!!!
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 water level between them is 4.0 m. Find ... 
Phizzics....
How does the weight of a Mars lander change as it travels from Earth to Mars? Does the weight ever equal zero? Does the mass of the lander change? Explain your answer. (Hint: restrict your analysis to a system consisting of Earth, Mars and lander.) 
Science
Can someone tell me if this is correct: How many forces act on an upwardly tossed coin when it gets to the top of its path? A. one the force due to gravity B. two gravity & the force in the coin itself C. three gravity the coins internal force & a turnaround force D. none of ... 
physics please someone help
Peggy drives from Cornwall to Atkins Glen in 52 min. Cornwall is 75 km from Illium in a direction 26° west of south. Atkins Glen is 27.1 km from Illium in a direction 16° south of west. Use Illium as your origin. (a) Draw the initial and final position vectors. (Do this on ... 
Physics
If the polevaulter were to land on concrete rather than on a cushion, the impulse that stops the fall would be what? A) Greater because of the rigidity of the concrete. B) Greater because of the force of impact is greater. C) The same because impulse is the change in momentum... 
english: critical thinking
From the thirteenth to the sixteenth century, the Inca empire flourished in the Andes Mountains. It maintained an eleventhousandmile network of stonepaved roads. 1) Which of the following, if true, provides the strongest support for an archaeologist’s conclusion that a ... 
PHYSICS
The fishing pole below (F = 94 N , = 1.90 m) makes an angle of 20.0° with the horizontal. What is the torque exerted by the fish about an axis perpendicular to the page and passing through the fisher's hand? i TRIED doing fdsinthetha=(1.90*94*sin20) this was not the right ... 
physics
Hi can someone please explain to me how to get the answers to the following questions. It would be greatly appreciated A pair of horizontal parallel plates are placed a small distance, 4.00 mm, apart in air. Each plate is rectangular with a width of 20.0 cm, and length of 37.0... 
Math
I am confused with this problem could someone please explain? Taxicab Distances Problem. Imagine that the grid lines on a coordinate grid are streets and that the distance between two points must be measured by the number of "blocks" a taxicab would have to travel horizontally... 
Calculus
A University of Rochester student decided to depart from Earth after his graduation to find work on Mars. Before building a shuttle, he conducted careful calculations. A model for the velocity of the shuttle, from liftoff at t = 0 s until the solid rocket boosters were ... 
Physic
How does doubling the mass of one object and tripling the distance between another object change the gravitational force betweem them? FG = G M1 M2 / r2 a. Force changes by 2/3 b. Force changes by 2/9 c. Force increases by 9 d. Force decreases by 3 e. No change in force 
HELP
How do you find acceleration and Fnet for a diagram containing only one object with a mass, like say 10kg, and two arrows going in the opposite directions(horizontally) with thier tips touching each side of the object. **NOTE: there are no other numbers other than the mass. If... 
Physics
A spy satellite is in circular orbit around Earth. It makes one revolution in 6.01 hours. (a) How high above Earth's surface is the satellite? [Answer in Km] (b) What is the satellite's acceleration? [Answer in m/s^2] I see this posted over and over again and I have about 4 ... 
algebra
the diameter of a small pizza is 16cm. this is 2 cm more than two fifths of the diameter of a large pizza. find the diameter of the large pizza? 
Earth science
what is the amount of force required to keep a 10kg ball moving in a constant direction at a constant velocity of 1 m/s ( ignore the effects of fricton 
phys
While spinning in a centrifuge, a 70.0 kg astronaut experiences an acceleration of 5.00 g, or five times the acceleration due to gravity on the earth. What is the centripetal force acting on her? 
AP physics
The sun is below us at a magnitude of nearly a line with the earth center. Are we then Heavier at midnight due to the sun's gravitational force on us, than we are at noon? Explain 
physics
calculate the electrostatic force between charges of 2.4 µC and +5.3 µC, placed 58cm apart in a vaccum. 
math
An ant starts at position (0, 0) and walks north, east, south or west, one unit at a time. How many dierent paths of length 8 units finish at (0, 0)? 
social studies
what is one of the earth's seven large bodies of land is called what? 
science
At which elevation would you be above one half of the mass of Earth's atmosphere? 
science
One kg weighs 9.8 N on Earth. Would it weigh more or less on the Moon? 
physics
at what attitude the value of g would become one forth than on the surface of the earth? 
Math
the mass of earth is 5.97 x 10^24 kilograms. The mass of the moon is 7.34 x 10^22 kilograms. Part A: What is the combined mass of earth and the moon? express your answer in scientific notation. Part B: How many times greater is the mass of earth than the mass of the moon? ... 
Physics Classical Mechanics
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 water level between them is 2.0 m. Find ... 
Science
Jupiter, Saturn, Uranus, and Neptune: what is one reason why life probably does not exist on these four planets? A) They have no gravity. B) They are the gas planets. C) They are the giant planets. **** D) They are the rocky planets. Earth seems to be the only planet in our ... 
history
Which of the following caused a rapid increase in the demand for coal and other fossil fuels in the late 1800s? HOME HEATING IN THE NORTH NEW SHIPS USING STEAM POWER COTTON PRODUCTION IN THE SOUTH MANUFACTURING IN THE NORTHEAST 
physics
if the angular speed of earth becomes 17times its present value what will be the 1.effect on a body on the equator of earth? it will be A. Heavier than present value B.lighter than present value C.weightless And also what is the reason? 2.a girl sitting on a swing stands up. ... 
physics
if the angular speed of earth becomes 17times its present value what will be the 1.effect on a body on the equator of earth? it will be A. Heavier than present value B.lighter than present value C.weightless And also what is the reason? 2.a girl sitting on a swing stands up. ... 
Math
Mercury's average distance from the sun is 57,910,000 km. The Earth is approximately 93,000,000 miles from the sun What would be the distance of a trip from Mercury to Earth, via the Sun. Look out for the units!!! (1 km =(0.62mi) Use Scientific Notation to solve this question. 
science
Examine the scenario. A child starts at a position of 2 m east of his house. He moves 1 m south, 5 m west, and then 1 m north. What is his displacement for this trip? 3 m west 5 m west 1 m north 7 m A? 
physics111
a river flows due south with a speed of 2.0m/s. a man steers a motorboat across the river;his velosity is 4.2m/s due east.the river is 800m wide. (A) what is his velocity(magnitude and direction)relative to the earth? (B)how much time is required to cross the river? 
maths
Compass bearings of a carin are taken from two points A and B, 400 m apart, along a strsight northsouth path, A being due north of B. the bearings of the carin from A and B are 110 degrees and 80 degrees, respectively. choose the two options which give the distances from A ... 
Biology
These are true and false questions and I want to make sure that I got them right. 1. A water molecule is held together by two single polar covalent bonds. False 2. Because oxygen has a greater electronegativity than hydrogen, water molecules are polar with two partial negative... 
Biology
These are true and false questions and I want to make sure that I got them right. 1. A water molecule is held together by two single polar covalent bonds. False 2. Because oxygen has a greater electronegativity than hydrogen, water molecules are polar with two partial negative... 
physics
A satellite of mass 205 kg is launched from a site on Earth's equator into an orbit at 200 km above the surface of Earth. (a) Assuming a circular orbit, what is the orbital period of this satellite? s (b) What is the satellite's speed in its orbit? m/s (c) What is the minimum ... 
science
why do we celebrate earth day? is it important to celebrate earth day? 
Math
A satellite moving in a circular orbit with respect to the earth's center experiences a gravitational force. If the satellite is put into a new circular orbit of smaller radius, how will the gravitational force and the speed of the satellite change ,if at all? 
chemistry
give the total number of protons and electrons in each atom Cr2+ 24 protons 22 electrons Cr3+ 24 protons 21 electrons Ni3+ 28 protons 25 electrons Ni4+ 28 protons 24 electrons 
physics
Two 10 meter long wires are parallel to each other and 5 cm apart.They carry currents of 6.0 A in opposite directions. What is the magnitude and direction of the magnetic field at a point P,halfway between the wires? Calculate the force exerted by the left wire on the right ... 
College Algebra
The population of the Earth is approximately 6 billion people and is growing at an annual rate of 1.9%. Assuming a Malthusian growth model, find the world population in 45 years. (Round your answer to one decimal place.) 
science
the freefall acceleration on the surface of the moon is appromimately 1/6 of the freefall acceleration on the surface of earth. compare the period of a pendumlum on earth with that of an identical pendulum set in motion on the moon 
science
The atmospheres of Mars and Venus are mostly carbon dioxide. Earth’s atmosphere contains only a fraction of a percent of carbon dioxide. Why is Earth’s atmosphere so different from those of Mars and Venus? 
maths
16. A pole of length 10 m casts a shadow 2 m long on the ground. At the same time a tower casts a shadow of length 50 m on the ground, then find the height of the tower. 
Trigonometry
The shadow of an electric pole is 5 m. long when thr angle of elevation of the seen is 60 degrees. Find the length of the shadow when the angle of elevation of the seen is 45 degrees 
math
The shadow of an electric pole is 5 m. long when thr angle of elevation of the seen is 60 degrees. Find the length of the shadow when the angle of elevation of the seen is 45 degrees 
physics
what is the difference in shape on a graph between 70 degrees north of east and 70 degrees east of south 
math,algebra
How do I even write an equation for this problem all i need someone to show me how to get an equation so i can solve it. It is estimated that the Earth is losing 4000 species of plants and animals every year. If S represents the number of species living last year, how many ... 
Physics
two dogs pull horizontally on ropes attached to a post; the angle between the rope is 70deg. dog A exerts a force of 268N and dog B exerts a force of 310N. find the magnitude of the resultant force. and the angle the resultant force makes with dog A`s rope. 
Physics
two dogs pull horizontally on ropes attached to a post; the angle between the rope is 70deg. dog A exerts a force of 268N and dog B exerts a force of 310N. find the magnitude of the resultant force. and the angle the resultant force makes with dog A`s rope. 
Physics
Two ropes attached to a young tree are pulled by two landscapers. Rope 1 is pulled with 267 N of force at an angle of 23 degrees north of east and Rope 2 is pulled with 377 N of force due west. a) Determine the magnitude and direction of the resultant force acting on the tree ... 
Physics
Two ropes attached to a young tree are pulled by two landscapers. Rope 1 is pulled with 267 N of force at an angle of 23 degrees north of east and Rope 2 is pulled with 377 N of force due west. a) Determine the magnitude and direction of the resultant force acting on the tree ... 
Math (Algebra 2)
Source: At the end of 1993, scientists tracked 1550 nonfunctional components in orbit and projected 42 such objects are added each year. Suppose that an average of 15 of these are brought back to Earth each year. Question: Write the function "R" that models the total number of... 
Microeconomics
Cant find equations for solving for MP and AP. Suppose firms A and B each make Tshirts. Firm A's production function is q = L0.5 K0.5. Firm B's production function is q = 1.2 L0.5 K0.5. a.If the two firms each hire the same amounts of capital and labor, compare the two firms ... 
math
Taxicab Distances Problem. Imagine that the grid lines on a coordinate grid are streets and that the distance between two points must be measured by the number of “blocks” a taxicab would have to travel horizontally and vertically to get from one point to the other. The ... 
physics please help
In a physics laboratory experiment, a coil with 170 turns enclosing an area of 10cm^2 is rotated from a position where its plane is perpendicular to the earth's magnetic field to one where its plane is parallel to the field. The rotation takes 5.0×10^2 s . The earth's ... 
Physics
In a city grid, each block o the eastwest streets is 180 meters long. Each block on the northsouth streets is also 180 meters long. A walker walks 4 blocks north and then 3 blocks east. How much father did the walker travel than the actual distance between the start and end ... 
physics
In a city grid, each block on the eastwest streets is 180 meters long. Each block on the northsouth streets is also 180 meters long. A walker walks 4 blocks north and then 3 blocks east. How much farther did the walker travel than the actual distance between the start and ... 
Physics
I have to find the eccentricity of an elliptical orbit with one focus, earth's center, E. I know the formula to find eccentricity is sqrt(1)(b^2/a^2), but I don't know where to use the radius or if I need it. Do I just need to use the eccentricity formula to find it? 0<E<1 
Physics
Two boys of the same mass, 45 kg, are on a playground merrygoround that has a diameter of 4.0 meters. Both boys are at the very edge of the ride. One boy stands with the coefficient of friction between his shoes and eh ride being .45 whereas the other is on his knees with a ... 
Physics
A satellite with an orbital period of exactly 24.0 h is always positioned over the same spot on Earth. This is known as a geosynchronous orbit. Television, communication, and weather satellites use geosynchronous orbits. At what distance would a satellite have to orbit Earth ... 
Physics
A disk with a mass of 18 kg, a diameter of 50 cm, and a thickness of 8 cm is mounted on a rough horizontal axle as shown on the left in the figure. (There is a friction force between the axle and the disk.) The disk is initially at rest. A constant force, F = 70 N,is applied ... 
History
Which of the following statements is true regarding the Korean War? A. The Chinese armed and trained the North Korean army. B. Stalin was outraged by the North Korean attack on South Korea. C. Stalin approved the North Korean attack in advance. D. Both Stalin and Mao expected ... 
Fluid Mechanics
A circular disc having a diameter of 125cm is immersed in water so that the distance of its perimeter measured vertically below the water surface varies between 60cm and 150cm. Find the total force due to the water acting on one side of the lamina, and the vertical distance of... 
Geometry
Two forces are pushing on an object, one at 12 lbs of Force and one at 5.66 lbs of Force. The angle between them is 35° (each is 72.5 from horizontal, such that the forces make a v with the object in the center). 17. What is the total Force on the object? 18. What is the ... 
physics
You're in an auto traveling at 25.0m/s toward a pole mounted warning siren. If the siren's frequency is 365 Hz, what frequency do you hear? Use 343m/s as the speed of sound. 
Chemistry
A hypothetical covalent molecule, X–Y, has a dipole moment of 1.62 D and a bond length of 179 pm. Calculate the partial charge on a pole of this molecule in terms of e (where e is the charge on an electron). 
Math: Angles of Elevation and Depression
the angle of elevation to the top of a flagpole is 40° from a point 30m away from The base of the pole.How high is the flagpole to the nearest meter? 
Physics
The power radiated by the sun is 3.90 1026 W. The earth orbits the sun in a nearly circular orbit of radius 1.50 1011 m. The earth's axis of rotation is tilted by 27° relative to the plane of the orbit (see the drawing), so sunlight does not strike the equator perpendicularly... 
Chemistry
11. Semiconductors (metalloids) have properties of both metals and nonmetals.T? 13. Covalent bonding occurs when electrons are transferred from one atom to another. F? 17. Bonding involves all the electrons in an atom. T? 20. Nonpolar bonds form when electrons are shared ... 
History
After the First Seminole War, the Seminole tribe was __________. A.forced to move south to avoid settlement and the US government B.given old lands to the north to encourage assimilation C.forced to leave its lands and be removed to the West D.given lands lost by the Creek ... 
Calculus
An air ambulance is travelling from Barrie to Toronto. Toronto is located 90 km [S5°E] of Barrie. If the wind is blowing from the South with a velocity of 62 km/h, and the plane’s air speed is 375 km/h, what direction must the pilot fly to make it to Toronto? What on earth ... 
Physics
The captain of a boat wants to travel directly across a river that flows due east with a speed of 1.09 m/s. He starts from the south bank of the river and wants to reach the north bank by travelling straight across the river. The boat has a speed of 6.44 m/s with respect to ... 
Environmental Science
On Earth in the extreme northern and southern latitudes, how does the relationship between GPP and NPP change during an entire year’s time? 
Environmental Science
On Earth in the extreme northern and southern latitudes, how does the relationship between GPP and NPP change during an entire year’s time? 
Physics
At what distance above the surface of the earth is the acceleration due to the earth's gravity 0.790 m/s^2 if the acceleration due to gravity at the surface has magnitude . 
Algebra
The mass of Earth is about 3 × 103 times the mass of Jupiter. The mass of Earth is about 6 × 10 24 kg. What is the mass of Jupiter? Give your answer in scientific notation. 
physics
If the sun is 372 times farther from the Earth than the Moon, and the Moon is falling around the earth at 1.4 mm/s, what is the rate that the Sun is "falling?" Is it 1/(372^2) or 7.22*10^6 mm/s? 
Maths
the speed of light is 3 * 10^ 8m/s. Jupiter is 778 million km from the sun. Calculate the number of minutes it takes for sunlight to reach Jupiter ? A star is 300 lights away from Earth. If the speed of light is 3 * 10^5 km/s. calculate the disatance from the star to Earth. ... 
Science
Geologist believe that The crystals inside a geode probably form when... A: Lava suddenly cools on earth’s surface B: Minerals dissolved in a solution evaporate C: Minerals dissolved in a solution crystallize D: magma cools slowly inside Earth Ok so I’m Almost positive ... 
physics
If a more complicated atom has two energy levels for its electrons at (15) eV and (30.1) eV, what is the wavelength of the photon (in nm) that is emitted when an electron transitions between these two levels? 
Language Arts
Which sentence contains a proper noun? A.We danced around the May Pole B.We went to a dance last weekend C.They ran in a special race every year D.Her mother came to watch the race Is the answer A? 
Physics
For two identical satellites in circular motion around the Earth, which statement is true? a. The one in the higher orbit has more kinetic energy b. The one in the lower orbit has more total energy c. The one in the lower orbit has less total energy d. Both have the same total... 
Physics
For two identical satellites in circular motion around the Earth, which statement is true? a. The one in the higher orbit has more kinetic energy b. The one in the lower orbit has more total energy c. The one in the lower orbit has less total energy d. Both have the same total... 
Physics
For two identical satellites in circular motion around the Earth, which statement is true? a. The one in the higher orbit has more kinetic energy b. The one in the lower orbit has more total energy c. The one in the lower orbit has less total energy d. Both have the same total... 
Social Studies
Why were Northern states in favor of Hamilton's protective traffic? The traffic protected the North from paying any additional fees when exporting their goods. The traffic allowed manufacturers in the North less expensive than imported goods. The traffic made goods produced in... 
Physics
Two 0.20 g metal spheres are hung from a common point by nonconducting threads that are 30 cm long. Both are given identical charges, and the electrostatic repulsion forces them apart until the angle between the threads is 20 degrees. How much charge was placed on each sphere? 
Math
Three circular pipes with 30cm diamters are strapped together. Find the length of the strap to the nearest centimeter. I got the circumference of the circle which is 94.25cm but that's where i got stuck. Can you please help? you are wrong sorry to tell ya. the circumfrence of ... 
science
I'm stuck on the following questions 1)The geocentric model of the universe states that the Earth is the center of the universe. This is an example of a A)scientific conclusion B)pseudoscience C)scientific law*** D)Scientific method Through process of elimination i know its ... 
physics
It takes you 7.6 min to walk with an average velocity of 2.5 m/s to the north from the bus stop to the museum entrance. How far did you walk? Answer in units of m What is your direction? (multiple choice) 1. West 2. North 3. South 4. East 
Please CHECK thanks
Please check and tell me what I got wrong and let me know the correct answer for the problem. Thanks. 1. Diarrhea can be caused by a change in diet and different minerals in the water. True (yes) False 2. Fusion produces less radioactivity than fission. True False (yes) 3. ... 
physics
I am not sure how to setup this problem. I posted it earlier and "BOB PURSELY" responded we are happy to critique your thinking. I have know idea how to solve this problem or even where to start. Please help!!! A tetherball leans against the smooth, frictionless post to which ... 
Physics
I am not sure how to setup this problem. I posted it earlier and "BOB PURSELY" responded we are happy to critique your thinking. I have know idea how to solve this problem or even where to start. Please help!!! A tetherball leans against the smooth, frictionless post to which ... 
r n
if two forces acting on a body at angle ¤ to each other and exerts a force of 20N,their resultant is 30N.what is the angle between them? 
Help w/this one again(Math!!)
Write one or two equations to represent the situation below. Solve the equation(s). Show all your work. Two cars leave town going in opposite directions. The car heading north travels at 55 mph. The car heading south travels at 75 mph. How long will it take them to get 715 ...