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.
117,802 results, page 80

Calculus 1
Related Rates I am having trouble finding the equation to use to fit this all together. At noon, ship A is 100km west of ship B. Ship A is sailing south at 35 km/s and ship B is sailing north at 25 km/s. How fast is the distance between the ships changing at 4:00pm. 
Calculus 1
Related Rates I am having trouble finding the equation to use to fit this all together. At noon, ship A is 100km west of ship B. Ship A is sailing south at 35 km/s and ship B is sailing north at 25 km/s. How fast is the distance between the ships changing at 4:00pm. 
Math
A pilot of a single engine airplane flies at a constant speed of 200 km/h at a bearing of 25 degree north east there is 40 km/h crosswind blowing south east 45 degree what are plane's actual speed and direction ? 
Calculus 1
Related Rates I am having trouble finding the equation to use to fit this all together. At noon, ship A is 100km west of ship B. Ship A is sailing south at 35 km/s and ship B is sailing north at 25 km/s. How fast is the distance between the ships changing at 4:00pm. 
Calculus
"At 9am ship A is 50 km east of ship B. Ship A is sailing north at 40km/h and ship B is sailing south at 30km/h. How fast is the distance between them changing at noon?" I can never get these type of questions where two ships are heading in different directions and one is ... 
chemistry
why is the molecule of Li2^2 a nonexistent? this is my reasoning: in the molecule, there is 5 bonding electrons and 3 antibonding electrons. (53)/2 gives a bond order of 1, which means the molecule should be diamagentic. please help! 
Physics
tammy leaves the office drives 50 km due north, then turns onto a second highway and continues in a direction of 32 degrees north of east for 93 km. At what angle is her displacement? (consider east to be 0 degrees and north 90 degrees) 
Physics
You have arranged that the magnetic field in a particular region of space is due North with a value of 0.009 T. An electron enters the field traveling to the west with a speed of 0.09 of the speed of light. As a result, the electron experiences a magnetic force, which is ... 
Chemistry
Why does losing two electrons to form a +2 Cation cause the greatest shrinkage in atomic radius of the following? People are telling me that's the answer but I don't understand. a. Gaining one electron to form a 1+ cation b. Losing two electrons to form a 2+ cation c. Gaining ... 
physics
While on the moon, the apollo astronauts enjoyed the effects on gravity so much smaller then that ont he earth. If neil armstrong jumped up on the moon with the initial speed 
physics
a projectile is fired from the surface of the earth with a speed of 200 m/s at an angle of 30 degrees above the horizontal. If the ground is level, what is the maximum height reached by the projectile 
Physics
Calculate the acceleration of a car that is travelling at a constant speed of 100 km per hour on a straight road. The radius R of the Earth is 6370 km. Why do we not feel this acceleration? 
history.
My name is Kashaf and i am 10 years old please!!! i need someone to answer my question. Compare the imagination of Earth's beginning and the appearance of first ape like man? I'll be very thankful to the one who will answer it in just a few minutes! Thank's alot! 
Science
Because the tilt of Earth's axis always points in the same direction, the seasons in the Northern and Southern Hemispheres are always _______ Options: A : Same B : Opposite C : three months apart. D : six months apart. PLEASE HELP ME ASAP 
Earth CRYience
Assume a parcel of air on the surface with a temperature of 29 degrees Celsius with a relative humidity of 50%. If the parcel rises at what altitude should clouds form? 
Earth/Space Science
In many ways, the floor of oceans is no better explored than space. Why could discoveries such as life around deepsea hotspots not be investigated until the past few decades? 
Physics
If the 50.0 kg boy were in a spacecraft 5R from the center of the earth, what would his weight be? (Use the 50.0 kg boy for significant figures) i got 20N again not sure.. it dosnt tell me if i got them wrong or right online classes are horrible and very confusing 
Physics/Astronomy
Predict the size of the image of Jupiter if photographed at opposition with a lens having a focal length of 9600 mm ( Assume Jupiter is a disk of 1.43 x 10^5 km and is 6.29 x 10^8 km from the earth). 
Optics/Physics
Predict the size of the image of Jupiter if photographed at opposition with a lens having a focal length of 9600 mm. (Assume Jupiter is a disk of 1.43 x 10^5 km and is 6.29 x 10^8 km from the Earth.) 
Geography
1. When geographers group locations on Earth together because they all have at least o characteristic in common, which theme of geography are they applying? A.location****B.region C.humanenvironment interaction D.movement 
astronomy
Astronauts on the Moon look back at Earth, a distance of about 400,000 km away. If the cities of Washington, D.C. and New York are separated by 300 km, what will be the angle between them when viewed from the Moon? 
earth
classify each of the folowing layers as liquid,rigid,or solid but able to flow slowly:lithosphere,asthenosphere,lower mantle,outer core,inner core. 
Physics(Please help)
A satellite of mass 500kg orbits the Earth in a circular path with radius 1.0e^7 m . 1) What is the period of the satellite? I know that the equation is T= 2(pi)r^3/2 / sqrt GmE mE = 5.98e^24 does G = 6.67e^11 ?? 
physics
A helicopter is ascending vertically with a speed of 5.60m/s. At a hight of 115m above the earth, a package is dropped from a window. How much time does it take for the package to reach the ground. 
Physics
The international space station ISS travels now with a speed of 7352 m/s. Calculate a) the radius of its orbit; b) the height of the orbit; c) the period of its motion around Earth. 
earth science
Which of the following is a true of passive continental margins A. They generally have a deep trench B. They have a continental rise C. Crust is destroyed at their boundary D. They always have a subduction zone 
Physical Science
A rocket moves through outer space at 11,000 m/s. At this rate, how much time would be required to travel the distance from Earth to the Moon, which is 380,000 km? 
College Physics
Suppose a planet is discovered that has the same total mass as the Earth, but half its radius. Calculate the acceleration due to gravity on the surface of this planet. 
Physical Science
a rocket moves through outer space at 11,000 m/s. At this rate, how much time would be required to travel the distance from Earth to the Moon, which is 381,000 km? 
chemistry
how much heat would be required to warm the earth's oceans by 1 degree celcius if the volume of the earths oceans is 137x100000000km3 and the density of the seawater is 1.03g/cm3 
physics
Two cars, A and B, travel in the same direction on a straight section of highway. A has a speed of 69.5 km/h, and B a speed of 84.3 km/h (both relative to the earth). (b) If A is initially 394 m in front of B, how long will it take for B to reach A? 
Math
Erica was searching for her sunglasses . She walked 2 blocks north, 3 blocks south, 4 blocks east, and 3 blocks west . How many blocks did she walk? How far Erica from where she began her search? 
math
Erica was searching for her sunglasses.she walked 2 blocks north,3 blocks south,4 blocks east, and 3 blocks west.How many blocks did she walk?How far is Erica from where she began her search? 
physics
A 34.1 kg child rides a Ferris wheel whose diameter is 18.3 m. When the ride is turning at a constant rate, the child’s speed has a constant value of 4.23 m/s. Find the normal force the seat exerts on the child at: a) The top of the ride b) The bottom of the ride 
Science (weather & climate) 
I just wanted to post this question once more. I have to go offline soon. Please go over my answers. Thanks True or false: 7.Eruptions fom volcanoes decrease global temperatures. I answered false because volcanes spew out CO2 into the atmophere. The 16._________sphere affects... 
PHYSICS
3 FORCES ACT ON MOVING OBJECT.FIRST FORCE HAS MAGNITUDE OF 80.0N AND DIRECTED DUE NORTH.ANOTHER HAS MAGNITUDE 60.0N AND DIRECTED DUE WEST.WHAT IS THE MAGNITUDE AND DIRECTION OF THIRD FORCE,SUCH THAT THE OBJECT MOVE IN CONSTANT VELOCITY? 
physics
A 3.00 102 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 18.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 8.00 m a) Find the work done by the pulling force (... 
physics
A 280 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 18.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 6.00 m. (a) Find the work done by the pulling force. (b... 
Physics
A 2.30 102 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 21.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 7.00 m. (a) Find the work done by the pulling force... 
physics
A 280 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 18.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 8.00 m. (a) Find the work done by the pulling force. (b... 
physics
A 3.00 102 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 18.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 8.00 m. a) Find the work done by the pulling force... 
Science
The maximum number of electrons in the second energy level of an atom is ____. two four eight ten The number of _____ is equal to the atomic number. protons neutrons electrons both a and c 
Chemistry
Write the chemical symbol for the atomic species with 35 electrons and a charge of +34 on the nucleus. Does the +34 charge just mean the number of protons? And then 35 electrons would give it a  charge so it would be Se? Or am I looking at this question wrong? Thanks! 
Help Science!!! :( need help
Is earth an inner planet or outer planet??? 
science
what are the four major fields of earth science? please help and thank you 
science
how far a science satellite should be from the earth's surface. 
earth
the blank is located between the island? what is in the blank? 
earth and space
the grams on the moon is different then space ? 
earth
how does the water cycle ensure that we have water. 
Math, Algebra (fast help would be nice)
So I did this whole math test and before I could hit "finish", my computer died and nothing saved. I have no memory of how I figured them out. Could you guys help please? Find the lateral area of the square pyramid. Show all steps. Base: 8m Length(height): 22m Find the surface... 
Physics please clarify
A charge of 3.00 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.135 m). The charges on the circle are 3.20 µC at the position due north and +5.00 µC at the position due east. What is the magnitude and ... 
Science
A student weighs 36.4kg suppose his entire body is made of electrons. How many electrons are present in his body. What would be charge in his body. 
Physics
An ocean liner leaves New York City and travels 26.9 ° north of east for 217 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship's displacement vector in the directions (a) due east and (b) due north? 
Physics
The captain of a plane wishes to proceed due west. The cruising speed of the plane is 245 m/s relative to the air. A weather report indicates that a 38.0 m/s wind is blowing from south to north. In what direction should the pilot head the plane relative to the ground? 
physics
1. A ship has a top speed of 3.0 m/s in calm water. The current of the ocean tends to push the boat at 2.0 m/s on a bearing of due South. What will be the net velocity of the ship if the captain points his ship on a bearing of 55 North or West and applies full power? 
Astronomy
The luminosity of the Sun is 4*10^33 erg/s, and its radius is 7*10^10 cm. What is the Sun's effective temperature? Please enter your answer in units of Kelvin. What is the Sun's effective temperature? Please enter your answer in units of Kelvin.  unanswered What is the flux ... 
Physics
1) A box m1 = 9.30 kg is stacked on top of another box m2 = 20.0 kg, placed on the floor inside an elevator. When the elevator is accelerating downward with a magnitude of 3.72 m/s2, what is the normal force that box m1 exerts on box m2? What is the normal force that the ... 
Math
A plane flies 150km due south and then 150km on a bearing of 45 degrees Celsius. With repeat to it initial position, find a. How far south the plane is b. how far east the plane is is c. It bearing d. How far way it is 
Physics
You are stranded in the middle of a frozen pond, 825 m in diameter which is so slippery that your feet slide freely and don't move you. In desperation you write an S.O.S. on your hat, mass 0.6 kg, and fling it towards the north with a velocity of 13 m/s at 54o with the ... 
college physics
(a) Two protons in a molecule are 3.80 multiplied by 1010 m apart. Find the electrical force exerted by one proton on the other. Magnitude N (b) State how the magnitude of this force compares with the magnitude of the gravitational force exerted by one proton on the other. (... 
college physics
(a) Two protons in a molecule are 3.80 multiplied by 1010 m apart. Find the electrical force exerted by one proton on the other. Magnitude N (b) State how the magnitude of this force compares with the magnitude of the gravitational force exerted by one proton on the other. (... 
college physics
Two protons in a molecule are 3.80 multiplied by 1010 m apart. Find the electrical force exerted by one proton on the other. Magnitude N (b) State how the magnitude of this force compares with the magnitude of the gravitational force exerted by one proton on the other. (... 
college physics
a) Two protons in a molecule are 3.80 multiplied by 1010 m apart. Find the electrical force exerted by one proton on the other. Magnitude N (b) State how the magnitude of this force compares with the magnitude of the gravitational force exerted by one proton on the other. (... 
Physics check
So I have an experiment and we have to find the mechanical advantage. 1. What is the MA when the load force is 7N and the effort force is 3N? 2. What is the MA when the load force is 7N and the effort force is 6N? My answer for 1. is 2.34 and 2. is 1.17. Are these correct? ... 
science
The movement of the earth around the sun____. a) is one of the reasons for seasons b) results in the formation of day and night c) makes the sun rise in the east d) causes earthquakes e) cause the ice ages to reoccur Just need to know if my answer or right or wrong. Thanks! :) a 
Earth Space Science
What type of motion would have to occur to move or displace the fixed color lines produced by a gas like helium or hydrogen toward the 400 nanometer mark on the spectrum scale? 
physics
Explain why should torques, not forces, play essential roles in the following actions. (a) open or close a door (b) tighten or loosen a screw using a wrench c) "Give me a place to stand, and I shall move the Earth with it" 
Language Arts
Which word best describes the tone of the following lines from "New World"? First Man, behold; the earth glitters with leaves; the sky glistens with rain. A. Appreciative B. Disgusted C. Puzzled D. Surprised Is the answer A? Thank you 
Science2 questions! asap!
During the processes of erosion and deposition, sediments that are the_____ in size will be carried the greatest distances before being deposited. Most___rocks form under conditions found a few kilometers under Earth's surface. 
Calculus
So I have a math problem that says that a freefalling body near the surface of the earth accelerates downward at a constant of 32 ft/sec^2. so for the graph a(t) it would just be a straight line across 32 no matter what time, or in other words a(t)=32. since v'(t)=a(t) ... 
enviromental science
what is in a region of longterm atmospheric conditions Sulfur dioxide in the upper atomsphere cand lead to the formation of what that reduce the amount of sunlight reaching the surface of Earth 
physics
A 33300 lb (earth weight) rocket in outer space has two constant forces acting upon it, F1 = (166i + 392j) lb and F2 = (50i + 54j) lb. Its initial velocity is (39i + 64j) ft/s. How far is it from where it started after 33 seconds? 
physics
A 33300 lb (earth weight) rocket in outer space has two constant forces acting upon it, F1 = (166i + 392j) lb and F2 = (50i + 54j) lb. Its initial velocity is (39i + 64j) ft/s. How far is it from where it started after 33 seconds? 
Physics
Consider a situation where immediately after birth, twins are separated. One continues to live on earth, while the other is whisked away in a space ship at 90% of the speed of light. After 65 years they are reunited. Will they look the same? Show proof of your answer through ... 
Earth Science
Considering the amount of energy required to produce animalbased foods and goods, should humans change their habits so they consume products closer to the bottom of the food chain because it is more efficient? PLEASE HELP. 
Physics
An ocean liner leaves New York City and travels 25.1 degrees north of east for 110km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ships displacement vector in the directions, a) due east and b) due north 
math
The runway of an airfield faces west. An airplane, flying in the direction of northeast at a height of 2km and at a speed of 400km/h, on a path which passes over a point 3km west of the runway end, is spotted sqrt(29)km horizontally(southwestern quadrant) from the runway end... 
Physics
Halley’s comet orbits the Sun with a period of 76.2 years. a) Find the semimajor axis of the orbit of Halley’s comet in astronomical units (1 AU is equal to the semimajor axis of the Earth’s orbit). 
Physics
Halley’s comet orbits the Sun with a period of 76.2 years. a) Find the semimajor axis of the orbit of Halley’s comet in astronomical units (1 AU is equal to the semimajor axis of the Earth’s orbit 
College Physics
A truck moving north at a speed of 70 km/h. The exhaust pipe on top sends out a trail of smoke that makes a 20 degree angle east of south. If the wind is blowing toward the east. What is the wind speed at that location? 
U.S.History
i know i've asked this question before but i never get a clear response.. i don't want the answer, but pleeeaes give me some information or some sites that have GOOD information. Discuss how both the North and South defended their position on the question of secession by ... 
Chemistry
Check answers? 1) Why did J.J. Thomson reason that electrons must be a part of the atoms of all elements? A) Cathode rays are negatively charged particles**** B) Cathode rays can be deflected by magnets C) An electron is 2000 times lighter than a hydrogen atom D) Chargeto... 
Calc
A spherical snowball is placed in the sun. The snowball melts so that it's surface area decreases at a rate of 2 cm2 /min. Find the rate at which the diameter decreases when the diameter is 8 cm. I'm not sure what formulas to use, SA and/or Volume. And im not sure how to ... 
physics
A circular plate of uniform thickness has a diameter of 56cm.A circular portion of diameter 42cm is removed from one edge of the plate .find the position of the center of mass of the remaining portion. 
Plane Trigonometry
A compact disk is 12 cm in diameter & rotates at 100 rpm when being played. The hole in the center is 1.5 cm in diameter. Find the speed in cm/min of a point on the disk & the speed of a point on the inner edge. 
Physics
Please someone help me I'm desperate!!!! Two steel guitar strings have the same length. String A has a diameter of 0.59 mm and is under 420.0 N of tension. String B has a diameter of 1.3 mm and is under a tension of 840.0N . Find the ratio of the wave speeds,VA/VB , in these ... 
Geology/Glaciers
Why do north facing slopes on mountains support glaciers today while south facing slopes do not? 
CHEMISTRY
As you may well know, placing metal objects inside a microwave oven can generate sparks. Two of your friends are arguing over the cause of the sparking, with one stating that the microwaves "herd" electrons into "pointy" areas of the metal object, from which the electrons jump... 
Physics..help please
A 715 N man stands in the middle of a frozen pond of radius 10.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 1.2 kg physics textbook horizontally toward the north shore at a ... 
History
3. What was the effect of the Nat Turner's Rebellion? A. It became illegal to teach slaves to read and write B. Laws came into effect to prevent of the freeing of slaves C. The Fugitive Slave Act was repealed in the south D. White people in the North developed the Underground ... 
physics
A 705 N man stands in the middle of a frozen pond of radius 4.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 1.2 kg physics textbook horizontally toward the north shore at a ... 
physics
A 740 N student stands in the middle of a frozen pond having a radius of 4.8 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 2.8 kg physics textbook horizontally toward the north ... 
physics
A 770 N man stands in the middle of a frozen pond of radius 9.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 1.2 kg physics textbook horizontally toward the north shore at a ... 
physics
A 748 N student stands in the middle of a frozen pond having a radius of 5.3 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 2.1 kg physics textbook horizontally toward the north ... 
Physics
A 750 N student stands in the middle of a frozen pond having a radius of 5.4 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 2.0 kg physics textbook horizontally toward the north ... 
Physics
A tow truck pulls a car from rest onto a level road. The tow truck exerts a horizontal force of 1500 N on the car. The frictional force on the car is 810 N. Calculate the work done by each of the following forces on the car as the car moves forward 12 m: (a) the force of the ... 
chemistry
In looking at the trend for electronegativity moving from left to right on the perioidic table, which reason below is the correct explanation of the trend? The nucleus is getting stronger and pulling harder on the electrons. The nucleus is getting weaker and pulling less on ... 
physics
A 3.00 10^2 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 18.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 8.00 m a) Find the work done by the pulling force... 
Help, Physics
A 3.00*10^2 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 18.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 8.00 m. (a) Find the work done by the pulling ... 
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...