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 57

physics
At what distance is the electrostatic force between two protons equal to the weight of one proton? 
physics
At the surface of Mars, the acceleration due to gravity is 3.72 m/s^2. A watermelon has a mass of 4.5 kg here on Earth. a) What is its weight here on earth? b) What is its mass in Mars? c)What is its weight in Mars? 
Math
The weight of an object on the planet Mercury is about 2/5 the weight of that object on the Earth. An object that weighs 30 pounds on Earth would weigh how many pounds on Mercury? 
physiscs
if the largest mass that you could lift on earth is 150 Kg. What is the largest mass you could lift on the moon. My work 150kg/10NKg x/1.6Nkg on earth on the moon =24 kg on the moon 
Physics
A ferry is crossing a river. The ferry is headed due north with a speed of 2.8 m/s relative to the water and the river’s velocity is 4.9 m/s to the east. a) What is magnitude of the boat’s velocity relative to Earth 
Physics
A ferry is crossing a river. The ferry is headed due north with a speed of 2.8 m/s relative to the water and the river’s velocity is 4.9 m/s to the east. a) What is magnitude of the boat’s velocity relative to Earth 
calculus
Two cars, one traveling north and one traveling west, collide at an intersection.The resulting momentum of the two cars together after the collision is 32 000 kg . m/s N30degreesW. Find the momentum of each car before the collision. 
Physics
Four identical 12µC charges are placed at the corners of a square of sides 44 cm, with one additional 12µC charge placed at the center. Find the electric potential at the midpoint of one of the sides. 
Scienceplease help
The gravitational force of the Earth acting on an object with more mass is stronger than the force on a smaller mass object of the same size, yet they both fall at the same rate of increasing speed (i.e. balls of different masses but with similar sizes fall to the ground at ... 
Reiny! Reiny! Reiny! Answer Check and HW Help!
Translate to a system of equations and solve: 1) The sum of two numbers is 36. One number is 2 more than the other. Find the numbers. Answer: (17,19) 2) Find two numbers whose sum is 66 and whose difference is 18. Answer: (37,29) These ones I am not sure of: 3) The difference ... 
physics
A strip of rubber originally 75 mm long is stretched until it is 100 mm long. a.What is the tensile strain b.Why has the answer no units? c.The greatest tensile stress which steel of a particular sort of a particular sort can withstand without breaking is about 10>9 N m>... 
physics
Three horizontal forces (the only horizontal one) act on a box sitting on a floor. One force (F1) acts due east and has a magnitude of 150 lb. A second force (F2) has an easterly component at 30.0 lb and a southerly component at 40.0 lb. The box remains at rest. Sketch the two... 
math
A 1000·kg car traveling with a velocity of 13·m/s north collides headon with a 2000·kg truck traveling with a velocity of 17·m/s south. Immediately after the collision, the velocity of the car is 11·m/s south. Taking north as the positive direction, what is the velocity ... 
physics
Earthquakes are essentially sound waves—called seismic waves—traveling through the earth. Because the earth is solid, it can support both longitudinal and transverse seismic waves. The speed of longitudinal waves, called P waves, is 7800m/s . Transverse waves, called S ... 
college 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 2.00mA. A third particle C, of mass 90.0mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at what x ... 
physics
A ferry is crossing a river. If the ferry is headed due North with speed of 2.5m/s relative to the water and the river's velocity is 3 m/s to the east, what will the boat's velocity be relative to Earth? 
Check my answers?
A. 75 % B. 12.5% C. 25% D. 3.13% E. 9.38% 3. what percentage of land on the earths surface is inhospital lands?  B 4. what percentage of earths surface is covered by land?  C 5. what percentage of land on earth is usable, for living on, but not for agriculture/farming?D 6. ... 
math
Two taps of various or different diameter can fill a tank in 9 and 3/8 hours. The tap of larger diameter takes 10 hrs less than the smaller one to fill the tank separately.Find the time in which each tap can separately fill the tank. 
physics
A puck on a horizontal, frictionless surface is attached to a string that wraps around a pole of finite radius, as shown in the figure . As the puck moves along the spiral path, does its speed increase, decrease, or stay the same? 
Physics
On June 9, 1988, Sergei Bubka broke the world polevaulting record for the 8th time in four years by attaining a height of 6.14 m. How long did it take Bubka to return to the ground from the highest part of his vault? 
Science
Find your mass if a scale on Earth reads 650N when you stand on it. 
Science
where can i find a good site that will show me the change's of the earth's atmosphere? 
science
churvas mass is 66kg. find his weight on earth and on the moon. 
science
churvas mass is 66kg. find his weight on earth and on the moon. 
physics
find the moment of inertia of the earth. Radius is 6,000 km and mass is 6 x 10^24 kg 
physics
Find the density of the earth if its mass is 6×10^3kg and radius is 6.4×10^3km 
physics
Two charges q1 = 2e and q2 =  4e are placed on the xaxis at points (0; 0) and (a; 0) respectively. (a) What is the magnitude and direction of the electrostatic force on q2 due to q1? (b) Suppose a third charge q3 = e is introduced at the location (b; 0) such that b > a. ... 
trig
two trains leave Kansas City at the same time. Train A is traveling due north at 55 mph, train B is traveling west at the rate of 65 mph. Find the distance between the two trains two hours later and the bearing of train B from train A. 
Physics
Can you explain the solutions steps by steps? Because i really don't understand when i revise it now. Thanks. The lines CA & CB are lines of greatest slope of two smooth fixed planes that intersect in a horizontal line through C. AB is horizontal & 5 m long. BC=3m & CA=4m. ... 
physics
A block of mass 4.0 kg is put on top of a block of mass M = 6.0 kg. To cause the top block to slip on the bottom one, while the bottom one is held fixed, a horizontal force of at least 19 N must be applied to the top block. The assembly of blocks is now placed on a horizontal... 
physics
A 2 μC charge is placed at × = 1 m while a second 2 μC Charge is placed at x=1. Find (a) the electric field at y = 0.5 m, and (b) the electric force a 3 μC charge placed at y=0.5 m. 
Chemistry
I did a back titration with an unknown carbonate and using the average % carbonate (by mass) which I found to be 27.40% and appropriate calculation decided where the unknown is an alkali metal carbonate or an alkaline earth metal carbonate. I have no idea how to tell the ... 
physics
THe steering wheel of a car has a diameter of 60cm and turns a shaft 4cm in diameter (a) If a 90nt force is needed to turn the wheel, what torque is exerted on the wheel? (b) What force is applied tangentially to the surface of the shaft? 
Chemistry (Orbital help needed)
I just want to make sure I'm doing this right... (Numbers in brackets are the square roots or electrons) "How many orbitals are completely filled in an atom that has 12 electrons? The electron configuration is 1s[2]2s[2]2p[6]3s[2]?" It would be 2 right? I'm thinking it takes 1... 
Pre Calc!
Two ships, one sailing at 30 km/hr and the other at 45 km/hr, left port at the same time. Three hours later they were 120 km apart. If you had to find the angle between their courses an equation that could be used to solve this problem is: 
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... 
geology (science)
how does the earth's four subsystems (lithosphere, hydrosphere, biospehere, atmosphere) interact with one another? 
Geography.
How does the tilt of the earth's axis explain changes in temperature from one season to another in the temperate zone? 
geology
True or False: Sand dunes are one of the most stable features on the Earth's surface. 
earth
the blank is located between the island? what is in the blank? 
Physics
In a television picture tube, electrons are accelerated by thousands of volts through a vacuum. If a television set were laid on its back, would electrons be able to move upward against the force of gravity? What potential diffrence , acting over a distance of 3.0 cm, would be... 
Physics
A rope is wound round a fixed cylinder of radius r so as to make n complete turns . Show that if one end of the rope is held by a force f, a force f e^2(pi)nu must be applied to the other end to produce slipping,where u is the coeff. of friction between rope and cylinder. 
physics
how many electrons drift past a point on for 10 minutes current is 0.2 A.the charge on one electrons 1.6*10^1 
Physics
[Young & Freedman, 312] A military airplane on a routine training mission is flying horizontally (in the positive xdirection) at a speed of 120. m/s and accidently drops a bomb (fortunately not armed) at an elevation of 2090 m. Air resistance may be ignored and answer with ... 
Reading
in which hemisphere do you find both north america and south america 
Physics
Four identical masses of 800kg each are placed at the corners of a square whose side length is 10.0cm. What is the net gravitational force (magnitude and direction) on one of the masses, due to the other three? I think I have to separate the four masses but I'm not sure how to... 
Physics
two lenses,one converging with focal length 20.0 cm and one diverging with focal length 10.0 cm , are placed 25.0 cm apart. An object is placed 60.0 cm in front of the converging lens. Determine A) The position and B) the magnification of the final image formed.C)Sketch a ray... 
Physics
Can you please provide me a starting point for these two questions Question One: Three charges are located on the +x axis as follows: q1 = +26 µC at x = 0 m, q2 = +13 µC at x = +2.0 m, and q3 = +42 µC at x = +3.5 m. (a) Find the electrostatic force (magnitude and direction... 
science
In experiments involving a pithball electroscope, what causes the pithball to move? I believe the answer is B A. The pith material always holds a natural positive charge, and it is attracted to other charged objects. B. Electrons jump onto or off the neutral ball when a ... 
trig
A man is between two tall buildings 8m away from the taller building. If the angle of the top of the building from where he stans bears N 8degrees W for the taller one and N 12degrees E for other. How far is he from the other building if the taller building is 6/5 as to the other 
Statistics
cant tell if i am on right track for this prababilitly hw assigment help would good! I was recently given a hw assigment dealing with the price is right's "money game". The contestant is shown nine cards on a board. Each card has one pair of numbers. One card has the first two... 
Conversions!
1. The price of gold is 200 dollars/oz. How much did 1 g of gold cost that day? (1 oz = 28.4 g)Use dimensional analysis. 2. How many minutes does it take light from the sun to reach Earth? (Distance from sun to Earth is 93 million mi, speed of light= 3 x 10^8 m/s) Use ... 
physics
A space station is shaped like a ring and rotates to simulate gravity. If the radius of the space station is 150 m, at what frequency must it rotate so that it simulates Earth's gravity? [Hint: The apparent weight of the astronauts must be the same as their weight on Earth.] ... 
biology
What regulary hit the earth for the first 600 million years of existence? What do scientists call this period of time?  Aseroids, and meteors hit the earth.What do scientists called this period of time ? I need help answer this question please. If the first question is right ? 
AP Physics
An object has a mass of 80 kg on earth. the acceleration of gravity on Mars is about 1/4 of the acceleration of gravity on Earth. What is the weight of the object on Mars? 
PHYSICS
assume you have a mass of 100 kg on earth. on the moon, where the gravitation of the moon is 1/6 gravitation of the earth, what is your mass on the moon and what is your weight on the moon 
Science
A day on Pluto lasts 6.39 times longer than a day in earth.If an Earth day lasts 24 hour how many hours is a day in Pluto? 
Physics
The gravitational constant for Earth is gE = 9.8m/s2. The gravitational constant for the planet Mongo is 20 m/s2. If an object has a weight of 10 lbs on earth, what is its weight on Mongo? 
Science
Does the Earth and moon have large molten core or only 1 of them does? I think the Earth only has large molten core 
math
An ant weights about 2*10 to the fifth power pounds. There are about 1*10 to the 15 power ants on Earth. How many pounds of ants are on Earth 
Physics
In a sporting goods store you see what appears to be two identical life preservers of the same size. One is filled with Styrofoam and the other one is filled with lead pellets. If you submerge these life preservers in the water, upon which is the buoyant force greater? Upon ... 
physics
A railroad car containing explosive material is initially traveling south at a speed of 4.5 m/s on level ground. The total mass of the car plus explosives is 2.9 104 kg. An accidental spark ignites the explosive, and the car breaks into two pieces, which then roll away along ... 
PHYSICS!!!
Hooke's law describes a certain light spring of unstressed length 36.0 cm. When one end is attached to the top of a door frame and a 6.40 kg object is hung from the other end, the length of the spring is 44.00 cm. (a) Find its spring constant I found the correct answer to be k... 
math
so if a car goes east 30mph and th other car was going 60mph south for one hour how far will they be from each other 
science
two uniform rods of same mass M and same length L are separated by a distance d.Find the gravitational force between the two 
Geography
Q. The Great Lakes border 2 regions and 2 countries, name them.  Regions: Pacfic Rocky Mountains Southwest North central South east North east  A. I don't exactly get it, 
physics
An oil drop is stationary within an electric field of 490 V/m that is set up between two parallel plates. If the volume of the oil drop is 4 X 10 (19) m3, how many excess electrons does it carry? (I'll give ya'll just one hint: the fundamental unit of charge e = 1.6 X 10 (19... 
physics
Noah wants to swim across a river 10 m wide, flowing from north to south. He swims so his velocity with respect to the river is 2 m/s due east, and the river moves at 4 m/s. How far downstream in m from his starting point will he reach the other side? 
physics
Noah wants to swim across a river 10 m wide, flowing from north to south. He swims so his velocity with respect to the river is 2 m/s due east, and the river moves at 4 m/s. How far downstream in m from his starting point will he reach the other side? 
math
have a question in math (( distance between two points )) the coordinate of the diameter of a circle are (6,4) and (2,0) find the length of the radius of the crcle. please in detales .. thank u 
math
have a question in math (( distance between two points )) the coordinate of the diameter of a circle are (6,4) and (2,0) find the length of the radius of the crcle. please in detales .. thank u 
physics
On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a golf club improvised from a tool. The freefall acceleration on the moon is 1/6 of its value on earth. Suppose he hits the ball with a speed of 25 m/s at an angle of 28° above the horizontal... 
Math
The difference between two polynomials is (5x+3).One of the two polynomials is (4x+13x^2). What is the other polynomial? Please help! Thank you 
Physics
A tennis ball on Mars, where the acceleration due to gravity is 0.379 of a and air resistance is negligible, is hit directly upward and returns to the same level 9.50 later. How fast was it moving just after being hit? The formula is the same as we use on earth, but the ... 
Physics 1
In recent years, scientists have discovered hundreds of planets orbiting other stars. Some of these planets are in orbits that are similar to that of earth, which orbits the sun (Msun = 1.99 × 10^(30) kg) at a distance of 1.50 × 10^(11) m, called 1 astronomical unit (1 au). ... 
Physics please help?????
Two small spaceships, each with mass m = 2000 kg, are in the circular Earth orbit of the figure, at an altitude h of 450 km. Igor, the commander of one of the ships, arrives at any fixed point in the orbit 90.0 s ahead of Picard, the commander of the other ship. At point P in ... 
Physics
A relay race is run along a straight line track 300.0 m long running south to north. 1st runner  starts at the South end of the track and passes the baton to a teammate at the north end of the track. 2nd runner  races back to the start line and passes the baton to a 3rd ... 
physics
Proponents of astrology claim that the positions of the planets at the time of a baby's birth will affect the life of that person in important ways. Some assert that this effect is due to gravity. Examine this claim with Newton's law of gravity. Calculate the maximum force ... 
phys
The proper length of one spaceship is 5 times that of another. The two spaceships are travelling in the same direction and, while both are passing overhead, an Earth observer measures the two spaceships to be the same length. If the slower spaceship is moving with a speed of 0... 
Physics
I have an exam in oceanography coming up and I'm having a little trouble understanding directions. For example in my review sheet he asks question like this: In what compass direction does the coriolis force act in the following situations: An object moving west at 22 degrees ... 
chem 101
. In an electron microscope the electrons generate the image. For one of the scanning electron microscopes in our Central Analytical Facility, the electrons are accelerated to have a kinetic energy of 200,000 eV. Electrons with this kinetic energy have a velocity of 2.67 x 10^... 
Physics
A +5.0 µC charge is placed at the origin and a 3.3 µC charge is placed at x = 25 cm. At what coordinates can a third charge be placed so that it experiences no net force? (x=? m) 
physics
A +5.0 µC charge is placed at the origin and a 3.9 µC charge is placed at x = 25 cm. At what coordinates can a third charge be placed so that it experiences no net force? 
algebra
Guy wire. How long is a guy wire reaching from the top of a 24ft ploe to a point on the ground 16 feet from the pole What is the exact length? what is the lenght approximated to three decimal palces? 
Physics
A satellite of mass 210 kg is launched from a site on Earth's equator into an orbit at 210 km above the surface of Earth. (a) Assuming a circular orbit, what is the orbital period of this satellite? (b) What is the satellite's speed in its orbit? (c) What is the minimum energy... 
chemistry
Electrons are one of the most important components in atoms. Compare and contrast how the electrons are organized in K (potassium), Al (aluminum), C (carbon), Cl (chlorine) and Ne (neon). Then explain how that electron structure leads these atoms to form or not form bonds with... 
Physics
A person walks the path shown below. The total trip consists of four straightline paths. Path 1 is 30.0 m due east. Path 2 is 200.0 m due south. Path 3 is 140.0 m 30.0° south of west. Path 4 is 170.0 m 60.0° north of west. At the end of the walk, what is the person's ... 
math
a vertical pole 5 feet long casts a shadow of 2 feet if at the same time a nearby shadow of 10 feet how tall is the tree 
Math 8R  HELP!!!!!
Mr. Martanarie bought a new lamp and lamppost for his home. The pole was 6 5/8 ft tall and the lamp was 1 1/4 ft in height. How tall were the lamp and post together? 
Mathsw
A man 6 feet tall is standing 9 feet from a 18 feet tall light pole. His shadow cast 15 degree. What is the angle formed from this equation? 
science
In electrolysis, electrons move between two metal strips called ________________. Please help!!! 
Chemistry
In which of the following substances does sharing of electrons between two atoms occur? He Nal PO43– Ag 
Physics
Near the surface of the Earth there is an electric field of about V=150 V/m which points downward. Two identical balls with mass m= 0.550 kg are dropped from a height of 2.30 m, but one of the balls is positively charged with q1= 800 microCoulombs , and the second is ... 
Physics
Near the surface of the Earth there is an electric field of about V=150 V/m which points downward. Two identical balls with mass m= 0.550 kg are dropped from a height of 2.30 m, but one of the balls is positively charged with q1= 800 microCoulombs , and the second is ... 
Earth Science
Which one of the following landforms would be created by outwash? 1) Moraines 2) Eskers 3) Drumlins 4) Erractics I have read all I can, but can not get this one. I am sure it is not #4  Erractics. 
Physics
I just need to know how to start this equation because it makes no sense The position of a particle is given by r = (6.0 cos 3.0 t i + 6.0 sin 3.0 t j) meters. Determine (a) the velocity vector, v, and (b) the acceleartion vector, a. (c) What is the parth of this particle? [... 
PreCalculus
A 15N force acting at 15 degrees north of east and a 18N force acting at 79 degrees north of west act concurrently on an object. What is the magnitude and direction of a third force that produces equilibrium on the object? Show sketch and work.  xcomponent:: 15*cos(15 ... 
Math  Calculus
Directions (or bearings) on Earth are measured in degrees, running from zero to 360 degrees, clockwise, starting with 0 degrees being due North. So due East for example, is 90 degrees, due South 180 degrees, and Northwest is 315 degrees. You are swinging a rock clockwise (... 
trigonometry
Find the magnitude of the resultant force and the angle between the resultant and each force: Forces of 2 lbs and 12 lbs at an angle of 60 degrees to each other. 
AP Physics
While exploring a cave, a spelunker starts at the entrance and moves the following distances: 75.0 m north, 250 m east, 210 m at an angle 30.0° north of east, and 150 m south. Find the resultant displacement from the cave entrance. I know I have to use the formulas Ax = A cos...