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 54

physics
the diameter of the moon is 3480 km. A.)what is the surface area of the moon? B.)how many times larger is the surface area of earth? 
physics
A 190 kg object and a 490 kg object are separated by 0.400 m. At what position (other than an infinitely remote one) can the 35.0 kg object be placed so as to experience a net force of zero?  m from the 490 kg mass I do not understand how to attack this problem. ... 
Physics
A plane leaves Seattle, flies 79.0 at 22.0 north of east, and then changes direction to 48.0 south of east. After flying at 123 in this new direction, the pilot must make an emergency landing on a field. The Seattle airport facility dispatches a rescue crew. In what direction ... 
math (solid mensuration)
A light is placed 5 ft. from the center of a globe 3 ft. in diameter. Find the area of the illuminated portion. thank you! 
Physics
Wrote the name and subject bad in the other post, sry:: Hello, this is the last question that I can't seem to be able to solve: 1. Jenny (75 kg) goes on a ski trip. She goes down a slope that's inclined at 15*. The drag coefficient of Jenny is 0.300, the surface of contact ... 
AP English
Plato, Symposium ’He who has been instructed thus far in the things of love, and who has learned to see the beautiful in due order and succession, when he comes toward the end will suddenly perceive a nature of wondrous beauty (and this, Socrates, is the final cause of all ... 
college physics
There are four charges, each with a magnitude of 2.0uC. Two are postive and two are negative. The charges are fixed to the corners of a 3.0m square, one to each corner, in such a way that the net force on any charge is directed toward the center of the square. Find the ... 
Astronomy
How can I tell a north circumpolar star from a south circumpolar one based on its declination and my location? 
physics
calculate the escape velocity for the following; assume a launch from the surface. A space probe leaving the moon to come back to Earth. A moon mission lander leaving the moon to come back to Earth. A spaceship leaving the solar system. 
Thomas Malthus
Thomas Malthus was a clergyman so is it safe to say that he did not believe in anything opposing the bible? Is it safe to say that as a firm believer in faith, he was certain that God created the Earth and the life on it? What can i say about Malthus's views on the Earth's ... 
physics
Four ropes are tied to a stake, and each is pulled toward a compass direction, N, S, E, or W. A force of 13 N is applied to the rope pulled toward the east. Forces of 23, 25, and 38 N are applied toward the south, west, and north, respectively. What is the direction of the net... 
English
Why does Squeaky not know at first who had won the race in "Raymond's Run". A. Raymond has climbed a fence.* B. The May Pole gets in the way. C. The finish is very close. D. Mr. Pearson talks too softly. I think it's either A or C 
physics
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 ... 
college physics
An object thrown vertically upward with initial velocity from the surface of the Earth reaches a height H before falling back toward the Earth. If initial velocity is doubled, the object reaches a maximum height equal to ________. Ignore air resistance. 
earth
#16 the inner core of the earth is solid because of increased__________ a> density and composition b> density and temperature c> temperature and pressure d> pressure and density 
math
Earth weight is 5.9736 x 10^24 Kg and Venus is 4.8685 x 10^24 Kg. What is the combined weight of Earth and Venus ? a)10.8421 X 10^26 Kg b)10.8421 x 10^23 Kg c)10.8421 x 10^25 Kg d)1.08421 x 10^25 Kg 
Math
Earth weight is 5.9736 x 10^24 Kg and Venus is 4.8685 x 10^24 Kg. What is the combined weight of Earth and Venus ? a)10.8421 X 10^26 Kg b)10.8421 x 10^23 Kg c)10.8421 x 10^25 Kg d)1.08421 x 10^25 Kg 
Precalc Math
The path of a satellite orbiting the earth causes the satellite to pass directly over two tracking stations A and B, which are 95 mi apart. When the satellite is on one side of the two stations, the angles of elevation at A and B are measured to be 87.0° and 84.2°, ... 
Math
The distance to the nearest 100000 km from Earth to the moon is given as 400000 km.The average speed to the nearest 500 km/h of a rocket to the moon is given as 3500 km/h.Calculate the greatest and least time it could take the rocket to reach the moon. 
Chem
How do you figure out the Noble Gas Configuration? Also, why do you not put in the "p" level and when do you( if you even do) put it in? You need to be more specific about your question. Elements that lose electrons (Na, Ca, Al, etc) gain the noble gas structure of the noble ... 
Planets
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 ... 
Math Poster Project
I have do complete a poster for math but I have some confusing instructions at first. Please help me understand and provide an example using the directions below that were given to me: Choose four rational numbers. At least two of your numbers should be between 1 and 1, one ... 
physics
The small piston has a diameter of 2cm and the large piston has a diameter of 6cm. How much more force can the larger piston exert compared with the force applied to the smaller piston? 
physics
for the hydrulic lift shown,what must be the radio of the diameter of the vessel at the car to the diameter of the vessel where the force F,is applied so that a 1.52x10^3 gr car can be lifted with a force F,of just 0.125kN? 
Physics
What is the repulsive electrical force between two protons in a nucleus that are 5 x 10^ 15 m apart from each other? Could you help me with this problem? I can't figure out how to do this. Use Coulomb's equation F= kQQ/r^2 
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 
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.) 
physics
The gravitatioinal force between two metal sphere in outer space is 2000 N. How large would the force be if the two spheres were four times farter apart? 
Physics
An air traffic controller observes two airplanes approaching the airport. The displacement from the control tower to plane 1 is given by the vector A , which has a magnitude of 220 km and points in a direction 32 degrees north of west. The displacement from the control tower ... 
trig
how high is a tree that casts a 30 ft shadow at the same time a 10 ft pole casts a shadow which is 10 ft long? 
Math
If a 6foot man has a shadow of 9 feet, how long a shadow would a 20foot pole have? 
physics
Vector has a magnitude of 122 units and points 37.0 ° north of west. Vector points 64.0 ° east of north. Vector points 17.0 ° west of south. These three vectors add to give a resultant vector that is zero. Using components, find the magnitudes of (a) vector and (b) vector . 
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
What is the total charge on all of the electrons in two liters, 2 kg, of water? One mole of water has a mass of 18 g and each molecule of water contains 10 electrons. Way I worked problem: (2kg)(1000g/1kg)(1mol/18g)(10e/1mol)(1.60e19/1e) What I did do wrong? 
Math
Given two spinners one with four equal parts labeled 1,1,3,4. And one with six regions labeled 1,2,3,4,5,6. Given one spin on each spinner what is the probability of spinning two numbers with the sum of 7? 
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 ... 
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 ... 
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 ... 
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 ... 
geography
where is the continental boundary between North and South America? Isthmus of Panama? Is this considered a continental boundary? Thanks 
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
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 ... 
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... 
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 ... 
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 
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? ... 
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 ... 
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... 
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
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... 
math
A swimmer is swimming across a river that is exactly one mile wide, and the river current is 1.5 mph directly south. If the swimmer can swim through still water at 2.5 mph, and he swims east, perpendicular to the northsouth bank, how far downstream will he be carried by the ... 
physics
calculate the electrostatic force between charges of 2.4 µC and +5.3 µC, placed 58cm apart in a vaccum. 
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... 
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? 
geometry
The measures of two supplementary angles are 6y + 3 and 4y  13. Find the measures of the angles. Select one: a. 117 and 63 b. 19 c. 63 and 27 d. 10 Two angles are complementary. One angle measures 26 degrees more than the other. Find the measure of the two angles. Select one... 
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 ... 
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. 
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)? 
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
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 ... 
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 ... 
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? 
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? 
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? 
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 
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.) 
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
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 ... 
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 ... 
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? 
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? 5 m west 1 m north 3 m west 7 m A? 
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 ... 
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... 
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 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. 
Science
Please help me with these questions from the Science 6: Forces and Motions Unit Test. My answer****** 1. Which of the following best describes the movement of an object at rest if no outside forces act on it? (1 point) It will move due to inertia. Gravity will eventually ... 
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 ... 
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
what is the difference in shape on a graph between 70 degrees north of east and 70 degrees east of south 
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 ... 
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
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
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 ...