Two electrons are placed; one at north pole and other at south pole of earth. Find the force between them. Given diameter of earth= 12800 km.
225,149 results, page 5

physics 231
A 84kg fireman slides down a 4m pole by applying a frictional force of 416 N against the pole with his hands. If he slides from rest, how fast is he moving once he reaches the ground? 
Physics
Paul and henry carry a sack weighing 600nt on a pole between them. If the pole is 2m long and the load is .dm from Paul, what forrce does each boy exert? 
Math
If a 6 meter pole and a 3 meter pole are connected by wires from the top to bottom, how tall is the pole touching the intersecting wires? 
physics??
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 x 106 m, determine the centripetal acceleration of a person situated (a) at ... 
physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 x 106 m, determine the centripetal acceleration of a person situated (a) at ... 
Physics
The orbital period of the moon about the earth is approximately 27.3 days. given that the average earthmoon distance is 384,000 kilometers, predict the moon's speed using the expression for centripetal force and the gravitational force, setting them equal to each other. 
Calc
A street light is at the top of a 16ft tall pole. A woman 6ft tall walks away from the pole with a speed of 6ft/sec along a straight path. How fast is the tip of her shadow moving when she is 30ft from the base of the pole? 
Physics
8. A 4.70 m long pole is balanced vertically on its tip. What will be the speed (in meters/second) of the tip of the pole just before it hits the ground? (Assume the lower end of the pole does not slip.) I did V^2=0^2+2(9.8)(4.70) and was wrong. I did remember to square root ... 
Physics
8. A 4.70 m long pole is balanced vertically on its tip. What will be the speed (in meters/second) of the tip of the pole just before it hits the ground? (Assume the lower end of the pole does not slip.) I did V^2=0^2+2(9.8)(4.70) and was wrong. I did remember to square root ... 
physics
calculate the centripetal acceleration of the earth in its orbit around the sun and the net force exerted on the earth. What exerts this force on the earth? Assume that the earth's orbit is a circle of radius 1.50x10^11m. (earth's mass= 5.98x10^29kg, Sun's mass= 1.99x10^30kg) 
physics
A box containing supplies is vertically lowered at constant speed by a rope from a hovering helicopter. Consider the following forces that arise in this situation: force 1: the force of the earth pulling on the box force 2: the tension force acting on the box force 3: the ... 
Physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration of a person situated... 
physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 x 106 m, determine the speed and centripetal acceleration of a person ... 
physics electromagnetism
Two long parallel vertical wires 0.3m apart are. ' placed eastwest of one another. The current in the westerly wire is 30A and on the other 20A. The horizontal component of the earths magnetic flux density is 2*10^5. Find the force per unit length on each wire. (The answers ... 
math
Search results for "a monky climbs 4 metres of a pole in 1 minute, but slips 2 metres in next minute.in how much time he will reach the top of a pole 15 metres long?assume that he starts from the bottom of the pole." 
chapter 14, lesson 5
max cut a pole into 4 equal pieces. then he cut 2 inches off one piece of the pole. then piece left was 4 inches long. how long was the pole to before Max started cutting? 
Science
Why doesn't the space station fall toward the earth, instead of remaining in space? a) It is beyond the earth's gravitational pull. B) The earth's gravity is balanced out by the attraction of the sun and other planets. C) Centrifugal force keeps it up. D) It does fall toward ... 
Math
It was observed that the shadow of a vertical pole of 6 meters longer when the angle of elevation of the sun was 30° than when it was 60°.By means of a sketched diagram,calculate,correct to two decimal places,the height of the pole. 
Math
For his 13th birthday Adam was allowed to travel down to Sarah's Sporting Goods store to purchase a brand new fishing pole. With great excitement and anticipation, Adam boarded the bus on his own and arrived at Sarah's store. Although the collection of fishing poles was ... 
science
does jupiter have a clockwise or counterrclockwise rotation? Both. It depends on the direction you are looking. For instance, looking at the Earth, from the South of Earth, Earth has clockwise rotation. But looking at it from the North, is is counterclockwise. 
Physics circular motion
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 x 106 m, determine the centripetal acceleration of a person situated (a) at ... 
Physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration of a person situated ... 
Physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration of a person situated ... 
physics
Suppose that the attraction between the moon and the earth were due to Coulomb forces rather than gravitational force. What would be the magnitude of the charge required if equal but opposite charges resided on both earth and moon? Mass of earth = 5.98×1024 kg; mass of moon... 
geometry
A guy wire is used to stabilize a utility pole. The wire is fastened to the pole 25 feet above the ground, and staked into the ground 4 feet from the base of the pole. (No standoffs are used, the wire goes directly from the pole to the ground stake.) Someone recommends that ... 
physics
A traffic light hangs from a pole as shown in the figure(Figure 1) . The uniform aluminum pole AB is 7.50 long and has a mass of 15.0 . The mass of the traffic light is 23.5 . Determine the tension in the horizontal massless cable CD. Determine the vertical and horizontal ... 
Science check answer quick!
I really do not understand Number 7 Which of these does Newton's law of universal gravitation imply? (Points : 1) The force of gravity between two objects is inversely proportional to the product of the two masses. < Earth's gravity acts on people inside a space station ... 
physics
An artificial satellite placed into earth's orbit has a mass of 1250kg. It travels at an average distance of 222.5km above the surface of the earth. The radius of the earth is 6370km. What acceleration due to gravity does the earth give the satellite? I know to find the ... 
Physics
Al the astronaut has a weight of 1600 N when he is standing on the surface of earth. What is the force of gravity action on him when he is in space station orbiting earth at a distance of four earth radii from the center of the earth? 
Math
At a distance of 56 feet from the base of a flag pole, the angle of elevationi to the top of a flag that is 3.1 feet tall is 25.6 degrees. the angle of elevation to the bottom of the flag is 22.9 degrees. the pole extends 1 foot above the flag. find the height of the pole. 
physics
An object in the vacuum of space orbits the earth at a fixed speed in a circular orbit several hundred miles above the earth. What can we conclude about the reaction force? a) That there is no reaction forcethe net force on the object is zero, so the reaction force is zero ... 
physics
An object in the vacuum of space orbits the earth at a fixed speed in a circular orbit several hundred miles above the earth. What can we conclude about the reaction force? a) That there is no reaction forcethe net force on the object is zero, so the reaction force is zero ... 
PRE ALGEBRA
solution to electrical poles that carry electrical wire seem to get smaller the further away you are. Find the apparent height of each pole if the tallest pole is 50 feet tall and there is 100 feet between poles. 
PHYSICS
A longstraight wire carries a current and is aligned with the NorthSouth direction. You place a compass 4 cm directly above the wire and above the North/East/South/West plane. The compass needle, which initially pointed North (far away from the wire) is now deflected by 20o ... 
physics
3) A satellite is orbiting Earth at a distance of 57 kilometers. The satellite has a mass of 96 kilograms. What is the force between the planet and the satellite? (Hint: Don't forget that the distance between them in the equation represents the distance to the center of the ... 
math
The length of the shadow of a pole on the level ground increases by 60 meter when one angle of elevation of the sun changes 54° to 32°.calaulate the height of the pole,correct to three significants figures. 
math
a pole leans away from the sun at an angle of 7 degrees to the vertical. when the elivation of the sun is 48 degrees the pole cast a shadow of 41ft long on level ground. how long is the pole? 
PreCalculusTrig
A pole tilts 12 degrees from the vertical, away from the sun, casts a 34 foot long shadow on level ground. The angle of elevation from the end of the shadow to the top of the pole is 64 degrees. How long is the pole? 
Trigonometry
A pole leans away from the sun at an angle of 7° to the vertical. When the angle of elevation of the sun is 51°, the pole cast a shadow 47ft. long on level ground. How long is the pole? 
Physics
The mass of the Moon is 7.35x10 to the 22nd Kg. At some point between the Earth and the Moon, the for of Earth's gravitational attraction on an object is cancelled by the Moon's force of gravitational attraction. If the distance between Earth and the Moon (centre to centre) is... 
Astronomy
For this question assume the moon is 110 of its diameter away from the Earth. The largest apparent size of Mercury that we ever see in the sky is 1/150 the apparent diameter of the Moon. The diameter of Mercury is about 4900 km. What is the closest that the Earth and Mercury ... 
Physics please HELP
A meteor is approaching. Assume that the meteor started very far away from the earth and just grazes the earth. You may ignore all other forces except gravitational force between earth and meteor. Assume that mass of the meteor is much smaller than mass of the earth. With ... 
science
The gravitational force of the Earth in relation to the gravitational force of everything else on Earth represents a(n) _____ that causes everything to all toward the center of the earth. Is the answer unbalanced force; balanced force; centrifugal force; or centripetal force? 
another math
At a distance of 34 feet from the base of a flag pole, the angle of elevation to the top of a flag is 48.6°. The flag itself is 5.1 feet tall. The angle of elevation to the bottom of the flag is 44.6°. The pole extends 1 foot above the flag. Find the height of the pole. 
Physics
If the flagpole has a mass of 21 kg and length 10 m and the angle the cable makes with the pole is ϕ = 20°, what are the magnitude and direction of the force exerted by the hinge on the flagpole? Assume the mass of the pole is distributed uniformly. 
Physics (please help!!!!)
Calculate the magnitudes of the gravitational forces exerted on the Moon by the Sun and by the Earth when the two forces are in direct competition, that is, when the Sun, Moon and Earth are aligned with the Moon between the Sun and the Earth. This alignment corresponds to a ... 
physics
An astronaut throws a wrench in interstellar space. How much force is required to keep the wrench moving continuously with constant velocity? Select one of the options below as your answer: A. a force equal to its weight on Earth B. a force equal to zero C. a force equal to ... 
Physics
Escape velocity from the surface of earth depends upon mass of the earth and radius of the earth. Find the realtion between these quantities dimensionely. 
Math (FST)
1. Give exact value of tan(theta) if cos(theta)=2/7 and pi/2<theta<pi. 2. Find the domain, range, period, and phase shift of y=3sin(2x4)+1 3. The city of cape town, South America, has latitude 33.92 degrees south and longitude 18.37 degrees east. The circumference of a... 
Physics
Calculate the force of gravity on a spacecraft 19200 km (3 earth radii) above the Earth's surface if its mass is 1600 kg. Hint: At three earth radii from the surface of the Earth, the gravity force (weight) of the spacecraft will be reduced to (1/4)^2 = 1/16 of the weight when... 
science(2 Qs)
PLEASE ANSWER MY 2 QUESTIONS IN SCIENCE THANKS 3.when a negatively charged object moves in the opposite direction of an electric force field,the potential energy of the object. A.becomes zero(I PICK THIS) B.increases C.decreases D.stays the same 4.the two south pole ends of ... 
Math
If an object which weighs 100 lbs on the Earth's surface were placed on a planet with 2 times the radius of the Earth and with 7 times the Earth's mass, how much would that object weigh? Enter answer to nearest 0.1 lbs. The term "void ratio" means the ratio of the volume of ... 
physics
please help i cannot figure this out A 0.27 kg ball of dough is thrown straight up into the air with an initial velocity of 12 m/s. Find the momentum of the ball of dough halfway to its maximum height on the way up. and A 61 kg polevaulter falls from rest from a height of 6.6... 
math
A tetherball is attached to the end of a 3meter rope. The rope is attached to a pole thatis 5 cm in diameter. Estimate the greatest number of timees the rope could rap around the pole. Use 3 for pi(3.14) to make your estimate. 
physics
A 2.5m long pole is balanced vertically on it's tip. If it falls over with it's bottom never slipping. Find the speed of the top end of the pole just before it hits the ground. 
physics
A 0.700kg ball is on the end of a rope that is 0.90 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 70.0° with respect to the vertical as shown. What is the... 
physics
Given that the Moon's period about the Earth is 27.32 days and the distance from the Earth to the Moon is 3.84*10^8 m estimate the mass of the Earth. Assume the orbit is circular. Why do you suppose your estimate is high? The force of attraction= centripetal force G MeMm/d^2=... 
geometry
Two poles, 60 feet tall and 20 feet tall, stand on opposite sides of a field. The poles are 80 feet apart. Support cables are placed from the top of each pole to the bottom of the opposite pole. How far above the ground is the intersection of the cables. What if the poles were... 
Physics
The average distance separating Earth and the Moon (center to center) is 384 000 km. Use the data in Table 7.3 to find the net gravitational force exerted by Earth and the Moon on a 3.00 multiplied by 104 kg spaceship located halfway between them (Earth mass kg: 5.98 x 10^24, ... 
Physics
Canadian geese migrate essentially along a northsouth direction for well over a thousand kilometers in some cases, traveling at speeds up to about 100 km/h. If one such bird is flying at 100 km/h relative to the air, but there is a 38.0km/h wind blowing from west to east. a) ... 
physics
This figure shows the force on a 0.1kilogram mass at various distances from Earth. Notice that the force decreases as the square of the distance. Now, consider satellites A and B, both circling Earth. If A has ten times the mass of B but B is 1/10 of the distance to the ... 
11th grade Physics
A long,straight currentcarrying wire runs from north to south. A) A compass needle placed above the wire points with its Npole toward the east. In what direction is the current flowing? B) If a compass is put underneath the wire, which direction will the compass neddle point? 
Maths
A satellite takes 93.8 minutes to orbit the earth. If the diameter of the earth is 12740km approximately and the satellite is at a height of 32km above the earth's surface, find the average speed of the satellite in km/h Working out please 
Math
A pole is painted 1/3 part red 1/5 part green rest 14 m yellow find total length of pole 
physics
Two meteoroids 250,000 km from Earth are moving at 2.1 km/s. Meteor one is headed in a straight path for Earth, while meteor two is on a path that will come within 8500 km from the Earth's center. (A) What is the speed of the first meteroid when it strikes Earth. (B) What is ... 
Physics
Two meteoroids 250,000 km from Earth are moving at 2.1 km/s. Meteor one is headed in a straight path for Earth, while meteor two is on a path that will come within 8500 km from the Earth's center. (A) What is the speed of the first meteroid when it strikes Earth. (B) What is ... 
physics
At a certain location on the Earth, the horizontal component of the Earth’s magnetic field is 2.5 ·10−5 T due North. A proton moves eastward with just the right speed for the magnetic force on it to balance its weight so the net force on the proton will be zero. Find ... 
Biology
Suppose that during meiosis I, the paternal chromosomes always went to one pole and the maternal chromosomes always went to the other pole. How would this affect the genetic variability of the offspring? Would children tend to look more like the parents? Why? 
Maths Algebra
The diameter of Sun is (1.4 ×10^8)m and the diameter of Earth is (1.2742×10^4)m . Show that the diameter of sun is nearly 100 times the diameter of Earth. 
Math
AB is a 6 m high pole. CD is a ladder inclined at an angle of 60 degrees to the horizontal and reaches up to a point D of the pole. If AD = 2.54 m, find the length of the ladder 
Algebra
A guy wire reaches from the top of a 24 ft. pole to a point on the ground 8 ft. from the pole. Find the length of the wire. 
math
A flagpole is supported by a wire that is 5m long. The wire is pegged 2.5m from the foot of the pole. Find the height of the pole 
PHYSICS
Nobel laureate Richard Feynman (19181988) once said that if two persons stood at arm's length from each other and each person had 1% more electrons than protons, the force of repulsion between them would be enough to lift a "weight" equal to that of the entire Earth. Carry ... 
AP Physics
A flagpole is to be installed on the front of an office building as shown below. The pole itself weighs 150 N and is 2 meters long. The support wire is attached at a 60º angle at a point 0.5 meters from the building. A. Find the value of the tension in the support cable. B. ... 
physics
Would someone check my thinking please. A solid sphere (mass, r, and moment of inertia given) is rotating at a given angular speed. Friction is constantly applied at the 'equator' of the sphere, and brings it to rest in 3s. Find the force. I worked out the torque, and then ... 
physics
can you walk me through this problem At what distance from the Earth will a spacecraft on the way to the Moon esperience zero net force due to these two bodies because the EArth and Mon pull with equal and opposite forces? mass of earth = m1 = 5.98 E 24 kg mass of moon = m2 = ... 
physics please help :)
a.the gravitational force between 2 electrons 1.00m apart is 5.42x10^71 N. Find the mass of an electron. b.2 spherical balls are placed so their centres are 2.6m apart. The force between the balls is 2.75x10^12N. What is the mass of each ball if one ball is twice the mass of... 
physics
A firefighter with a weight of 722 N slides down a vertical pole with an acceleration of 3.11 m/s2, directed downward. (a) What are the magnitude and direction of the vertical force (use up as the positive direction) exerted by the pole on the firefighter? N (b) What are the ... 
calculus
A street light is at the top of a 15.000 ft. tall pole. A man 6.300 ft tall walks away from the pole with a speed of 6.000 feet/sec along a straight path. How fast is the tip of his shadow moving when he is 45.000 feet from the pole? 
math
Find the distance btw two cities. Assume that the Earth is is a sphere of the radius 4000 miles and that the cities are the on the same longitude(one city is due north of the other). 
Astronomy
1. How did the geocentric model explain the retrograde motion of planets? A. Earth moves faster in its orbit and passes the other planets. B. The planets move backward when they get too close to earth. C. The planets travel in circles as they move around earth in a circle. D. ... 
Science
An artificial satellite circles around the earth at the height where the gravitational force is one fourth of that at earth's surface. If the earth's radius is R the height of the satellite above the surface of the earth is? 
Geometry
A six foot person is walking away from an 18 foot pole. Express the distance between the pole and the person in terms of the length of the persons shadow. 
physics
Calculate the magnitude of the gravitational force between the Earth and an m = 6.00 kg mass on the surface of the Earth. The distance to the center of the Earth from the surface is 6.37×103 km and the mass of the Earth is 5.98×1024 kg. B)Calculate the magnitude of the ... 
physics
A 512 kg satellite is in a circular orbit about the Earth at a height above the Earth equal to the Earth's mean radius. (a) Find the satellite's orbital speed. (b) Find the period of its revolution. (c) Find the gravitational force acting on it. 
Math 9
Please help me on this question. Thanks! One pole measured 1.35m and the smaller pole measured 0.83m. They needed to be tied together. They were attached by overlapping the ends and tying them together. The length of the overlap was 12cm. What is the total length of the new ... 
college physics
Nobel laureate Richard Feynman (19181988) once said that if two persons stood at arm's length from each other and each person had 1% more electrons than protons, the force of repulsion between them would be enough to lift a "weight" equal to that of the entire Earth. Carry ... 
physics
What two facts did Newton need to be able to calculate the acceleration of the Moon? A) the distance to the Moon and the diameter of the Moon B) the time it takes the Moon to make one revolution and the distance from the Earth to the sun C) the diameter of the Moon and the ... 
physics
What two facts did Newton need to be able to calculate the acceleration of the Moon? 1) the distance to the Moon and the diameter of the Moon. 2)the time it takes the Moon to make one revolution and the distance from the Earth to the sun. 3)the diameter of the Moon and the ... 
physics
What two facts did Newton need to be able to calculate the acceleration of the Moon? 1) the distance to the Moon and the diameter of the Moon. 2) the time it takes the Moon to make one revolution and the distance from the Earth to the sun. 3) the diameter of the Moon and the ... 
physics
a body is thrown vertically upward fron a certain height of pole and their velocity is 100m/s and then it returns to the ground in 6second then find the height of the pole ? 
Geometry (answer please)
1. A vertical pole 24ft. high is to be braced securely by four wires attached 8ft. from the top. If the wires are fastened to stake in the level ground at the vertices of square with its center at the foot of the pole and sides 20ft. What should be the length of each wire? 2. ... 
science(2 QUESTIONS)
PLEASE ANSWER MY 2 QUESTIONS IN SCIENCE THANKS 3.when a negatively charged object moves in the opposite direction of an electric force field,the potential energy of the object. A.becomes zero(I PICK THIS) B.increases C.decreases D.stays the same 4.the two south pole ends of ... 
PreCalculusTrig
Two surveyors, Joe and Alice, are 240 meters apart on a riverbank. Each sights a flagpole on the opposite bank. The angle from the pole to Joe (vertex) to Alice is 63 degrees. The angle from the pole to Alice(vertex)to Joe is 54 degrees. How far are Joe and Alice from the pole? 
physics
Two men are carrying a 9.00m telephone pole that has a mass of 115 kg. If the center of gravity of the pole is 3.00 m from the right end, and the men lift the poles at the ends, how much weight must each man support? 
calculus
The moment of inertia about the pole(origin) of the plane region which is inside the cardiod: r = 1 + cosO and outside the circle r =1. It's mass density is equal to it's distance from the pole..... I need someone who is way smarter than me to help with this one... please and ... 
south pole expl.
What are the accomplishments by Robert Scott in his two antarctic expeditions? 
calculus 2
Find all points of intersection of the given curves. (Assume 0 ≤ θ ≤ 2π. Order your answers from smallest to largest θ. If an intersection occurs at the pole, enter POLE in the first answer blank.) r = 1 − cos θ, r = 1 + sin θ 
physics 211
A deepsea fisherman struggles to bring in a big salmon (see figure below). Find the force each hand must exert on the pole if the tension in the line is 159 N. Neglect the weight of the pole and assume that the force exerted by the left hand is directed along the horizontal... 
physics
a pole 10m long rests slantly against a vertical wall ab making 60 degrees with the horizontal (ground). find how faris the foot of the pole from the wall