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.
100,421 results, page 72-
science
1. describe the relationship between the mass of a planet and the number of satellites it has. 2. an observer on earth can watch venus go through phases much like earths moon does. expleain why this is so? i looked all through my text book for the answer
asked by sally on November 26, 2010 -
history
why is the study of the history of Apartheid in South Africa important in the study of world history? Apartheid in South Africa shows us what happens when a minority attempts to control the majority by extreme institutionalized discrimination. Although
asked by Varun on September 8, 2006 -
Science
Geologist believe that The crystals inside a geode probably form when... A: Lava suddenly cools on earth’s surface B: Minerals dissolved in a solution evaporate C: Minerals dissolved in a solution crystallize D: magma cools slowly inside Earth Ok so
asked by PLEASE HELP!! on February 8, 2018 -
Physics
1)The Earth exerts an 710 N gravitational force on a man. What force does the man exert on the Earth? Answer in units of N 2)If a book is sitting on a table, the force of gravity pulls it down. Why doesn’t it fall? Is it because The table is pushing up
asked by Sally on March 1, 2013 -
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.
asked by Thomas on August 24, 2010 -
Science
The following sphere is responsible for forming the solid shell of Earth that holds up life? -Hydrosphere -Lithosphere -Atmosphere -Biosphere** Explain the interaction between the four main components of Earth's physical systems. Be sure to include the
asked by PoPo on March 13, 2017 -
Chemistry
Does the conversion of hydrogen peroxide to oxygen involve oxidation or reduction? What substance is acting as the oxidizer or reducer? and Does the conversion of hydrogen peroxide to water involve oxidation or reduction? What substance is acting as the
asked by Raj on March 10, 2007 -
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)
asked by Dallas on September 27, 2014 -
Physics
Astrotrain, a Decepicon triple changer, is traveling at a speed of .77c towards Earth, as seen by Blaster, who is on Earth inside Fortress Maximus. Astrotrain's computers tell him the icon rocket was fired at .35c. Determine the length of the ion rocket as
asked by Anonymous on May 6, 2009 -
Physics
A person walks 13.9◦ north of east for 2.51 km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? How far due east would this person walk?
asked by Shay on September 16, 2012 -
Physics
A person walks 13.9◦ north of east for 2.51 km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? How far due east would this person walk?
asked by Shay on September 16, 2012 -
Physics.. please help!!!!!
A person walks 28.2◦ north of east for 3.33 km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? How far would this person walk due east?
asked by Elle on October 9, 2011 -
Physics
Electrons are ejected from a surface with speeds ranging up to 6.0 x 10^5 m/s when light with a wavelength of 400 nm shines on it. a.) What is the work function of this surface? b.) What is the threshold frequency for this surface? c.) What is the
asked by Nathaniel on June 12, 2006 -
chemistry
Find the potential energy, V(r), and the magnitude of the force, | F |, associated with: (a) the interaction between a proton and an electron separated by a distance of 0.529 Å (b) the interaction between the nucleus of Neon (Ne) and an electron separated
asked by Taylor on September 14, 2012 -
Physics
An ice skater skates 16.9 m southwest, then 33.8 m east, and finally 50.7 m in a direction 50.9◦ north of east. Find the magnitude of the displacement re- quired to bring the skater back to her starting point. Answer in units of m
asked by NADIA on January 19, 2014 -
AP Physics
An ice skater skates 28 m southwest, then 56 m east, and finally 84 m in a direction 50.3 ◦ north of east.Find the magnitude of the displacement required to bring the skater back to her starting point. Answer in units of m
asked by josselin on September 25, 2014 -
Physics
An ice skater skates 13.3 m southwest, then 26.6 m east, and finally 39.9 m in a direction 51.5◦ north of east. Find the magnitude of the displacement required to bring the skater back to her starting point. Answer in units of m
asked by Bob on September 22, 2014 -
Astronomy
Light travels at a constant speed of 3.0 x 105km/s. The distance between the Sun and the Earth is about 1.5 x 108km. Use the distance = speed x time formula (d = v t) to calculate the time it takes light to travel from the Sun to the Earth. Show your work.
asked by Lilly on March 15, 2014 -
Astronomy
Light travels at a constant speed of 3.0 x 105km/s. The distance between the Sun and the Earth is about 1.5 x 108km. Use the distance = speed x time formula (d = v t) to calculate the time it takes light to travel from the Sun to the Earth. Show your work.
asked by Lilly on March 15, 2014 -
computer science
A GPS satellite develops a fault whereby it moves into an orbit 19 500 km above the Earth’s surface and also emits a weak signal whose power is only 24 W. What will be the power per square metre of the signal received on the Earth’s surface? Choose the
asked by yomi on November 21, 2016 -
physics
questoins asked in a physics lesson which i find hard to answer: 1) do all objects have the same acceleration when they fall to earth? explain the answer. 2) what is the difference between weight and mass? any help would be greatly appreciated :)
asked by Candice on March 10, 2009 -
Physics
A satellite orbits the Earth with a radius of 7000km. The acceleration of gravity at this distance=8.17m/s/s. How do I find the velocity of the satellite? I'm really struggling with finding the correct formula. I know the answer but can't figure out how to
asked by Leslie on June 29, 2016 -
Physical science
the space shuttle typically orbits 400 km above the earth's surface.the earth hass a mass of 5.98*10 to the 24 squared kg and a raduis of 6,380 km.A)how much would a 2000 kg part form the space station weight when it has been lifted to that orbit in the
asked by Chad on December 7, 2015 -
Astronomy
The Universe is filled with a frozen in Higgs condensate. If this were to suddenly disappear/evaporate, what would happen? (a) All bound matter—nucleons (made of quarks), nuclei (made of nucleons), atoms (made of nuclei and electrons), people (made of
asked by qwerty on October 1, 2013 -
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
asked by jade on March 13, 2010 -
Math
A satellite will be released into an orbit of more than 400 miles above the earth. the rocket is carrying it is currently 255 miles above earth write and solve an inequality to show how much higher the rocket must climb before it releases the satellite
asked by Coleson on September 23, 2014 -
Physics
A 2115 kg car moving east at 10.61 m/s col- lides with a 3169 kg car moving north. The cars stick together and move as a unit after the collision, at an angle of 32.4◦ north of east and at a speed of 5.03 m/s. What was the speed of the 3169 kg car before
asked by Sarah on April 1, 2014 -
physics
The eye of a hurricane passes over Grand Bahama Island in a direction 60.0° north of west with a speed of 36.1 km/h. Three hours later, the course of the hurricane suddenly shifts due north, and its speed slows to 26.9 km/h. How far (in km) from Grand
asked by nate on September 9, 2012 -
Physics
If there was a way to accelerate a spaceship close to the speed of light to go visit some neighboring star system, one would still face the problem that every particle the spaceship finds on its way will be a projectile hitting it with almost the speed of
asked by Ryan on October 14, 2015 -
Physics please check
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 = 0.125 m). The charges on the circle are -4.60 µC at the position due north and +5.00 µC at the position due east. What is
asked by Mary on December 14, 2007 -
Math
Could someone please check my work on these word problems? My solutions just don't seem right, could you please let me know where I may have messed up. Many people know that the weight of an object varies on different planets, but did you know that the
asked by ASD on September 19, 2010 -
World Religions
Many people see life on earth as constant worry, physical poverty, spiritual alienation, sickness, hatred, mindless toil, and death. The ultimate goal of nirvana or being one with the Atman seems infinitely better than suffering on earth. For more
asked by Ms. Sue on July 22, 2007 -
chem-balancing acidic equation
the reaction: Cr2O7^-2(aq) + Cl- -> Cr^3+(aq) + Cl2(g) My balancing. Cr2O7^-2(aq)-> Cr^3+(aq) +Cr +7H2O +14H+ +6e- Cr2O7^-2(aq)+14H+ +6e- -> 2Cr^3+(aq)+7H2O Cl- -> Cl2(g) +Cl- +2e- 2Cl- -> Cl2 +2e- Cr2O7^-2(aq)+14H+ +6e- +2Cl- -> 2Cr^3+(aq)+7H2O +Cl2 +2e-
asked by alexa on May 17, 2007 -
all the above
Dancers from the movie Rize continue to spread their inspirational message of hope to Los Angeles’ South Central youth. How should the sentence above be rewritten to correct the subject-verb agreement error? The sentence is correct as written. Dancers
asked by Lisa on September 1, 2015 -
Physics
How would a physics expert respond to the following suggestions made by three airline executives? Write a script of the expert's response for performance in front of the class. Airline Exectutive A: Since the earth rotates from west to east, we could
asked by Becca on December 20, 2006 -
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
asked by joy on December 8, 2010 -
Trig
This problem is stumping me, can anyone help me? The Earth rotates every 24 hours (actually 23 hours, 56 minutes and 4 seconds) and has a diameter of 7926 miles. If you're standing on the equator, how fast are you traveling (how fast is the Earth
asked by jake on October 4, 2009 -
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
asked by Lena on August 25, 2007 -
Science
Give some examples of artifacts that are used to determine the geological history of the Earth, as well as how its life forms have changed over time. Is the question given and I don't really know any artifacts that are used for the geological history of
asked by Sam on January 30, 2018 -
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
asked by Anonymous on December 8, 2009 -
Physics
Any help is appreciated! A grandfather clock is based on the period of oscillation of a pendulum. The clock keeps perfect time on the first floor of the Sears tower but when carefully moved to the top floor h=436 m above the surface of the earth, the clock
asked by Jamie on November 30, 2016 -
S.S
I'm Having Trouble With These, Help If You Want. If You Do Know The Full Answer List, That Would Be Nice Too! 1. What significant affect did the Treaty of pairs, signed after the french and Indian War, have on France? a.France had to Withdraw to its empire
asked by Jassie on September 28, 2017 -
physics
I neeeeeeeeeed helppp pronto, Measurements show that a honeybee in active flight can acquire an electrostatic charge as great as 93.0 pC a. how many electrons must be transferred to produce this charge? b.suppose 2 bees, each with a charge of 93.0pC, are
asked by natash on September 10, 2007 -
physics
A bird wants to rech its nest that is located 53 meters (35 degrees south of west) from where it is perched. If the maximum speed that the bird can fly with respect to the air is 12m/s and there is a wind blowing from a direction of east 35 degrees south
asked by Kate on March 24, 2013 -
science
India : Duck Australia : Duck South Africa : Duck, Goose Africa : Duck Cat Antarctica: Duck Goose If scientist wanted to argue that South Africa, Africa, and Antarctica was once connected, which animals would they use to determine that? Would it be just
asked by Chopsticks on April 1, 2009 -
Social Studies
PLZ HELP IM FAILING THIS CLASS AND IF I DONT GET MOST OF THE QUESTIONS RIGHT I'LL HAVE TO RETAKE THE CASS! PLZ HELP “The state of monarchy is the supremest thing upon earth; for kings are not only God's lieutenants upon earth, and sit upon God's throne,
asked by name:unknown on November 13, 2018 -
chemistry
"Suppose you had a mole of gold atoms (radius=144pm) and could link the atoms together like a string of pearls. How many of these gold necklaces could you make using 1 mole of gold atoms so that each necklace would stretch from the earth to the sun?
asked by Nicole on September 24, 2008 -
Math
Earth orbits the sun in an elliptical pattern. the equation of earths path is (x+2.5)^2/22350.25 + y^2/22344=1 where the measurements represent millions of kilometers. The sun is located at the focus (0,0). In january, earth id located at one vertices
asked by Milo on October 31, 2018 -
Maths
the speed of light is 3 * 10^ 8m/s. Jupiter is 778 million km from the sun. Calculate the number of minutes it takes for sunlight to reach Jupiter ? A star is 300 lights away from Earth. If the speed of light is 3 * 10^5 km/s. calculate the disatance from
asked by YOYO on November 26, 2007 -
Physics
A satellite of mass 220 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? 5310 s (b) What is the satellite's speed in its orbit?
asked by Ana on March 13, 2010 -
msth
the mass of earth is 5.97*10^24 kilograms the mass of the moon is 7.34 *^22 kilograms what is the combines mass of earth ad the moon. express your answer in scientific notation
asked by s on April 5, 2018 -
science help PLS
An astronomer see a star that is very far away but still very bright. What can she conclude about the star? The star must be very large. The star must be very small. The star must be moving away from Earth. The star must be moving closer to Earth.
asked by Oscar on February 4, 2016 -
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?
asked by Apple on September 25, 2011 -
math
An object that weighs about 2.1 pounds on the moon weighed 12.56 pounds on Earth. About how much would an astronaut who weighs 174 pounds on Earth weigh on the moon?
asked by sharday on December 17, 2015 -
Science
What are the building blocks of minerals? A. Rocks B. Elements C. Isotopes D. Electrons I believe the answer is A.
asked by Anonymous on August 27, 2018 -
physics
At what distance would the repulsive force between two electrons have a magnitude of 8.50 N? I have no idea how to do this problem... can someone help me please... 3x10^-4/8.50?
asked by kate on March 9, 2009 -
chemisrty
how can you calculate the net charge of an ion if you know the number of protons, neutrons, and electrons it contains?
asked by rica on November 4, 2009 -
science
Draw and label a diagram of a nitrogen atom. It should have 7 protons,7 neutrons, and 7 electrons
asked by Jack on September 27, 2016 -
Chemistry
What is the kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency 1.7×10^{15} Hz?
asked by Caitlin on September 27, 2011 -
chemistry
What is the kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency 1.5*10^{15}Hz?
asked by Anonymous on January 30, 2010 -
chemistry
how many unpaired electrons are in this configuration 1s2 2s2 2p6 3s2 3p3
asked by Emmanuel on January 18, 2017 -
chemistry
how many unpeeled electrons are in this configuration 1s2 2s2 2p6 3s2 3p3
asked by Emmanuel on January 18, 2017 -
Physics
How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.8 µC?
asked by rick on January 24, 2008 -
Chemistry
What are transferred in an oxidation-reduction reaction? atoms*** electrons ions protons
asked by Holly on May 19, 2016 -
biology
an atom that gains for loses electrons has an electrical charge and is called an _____.
asked by greg on September 13, 2010 -
PHYSICAL SCIENCES
Which of the following elements has eight valence electrons? A. argon B. beryllium C. chromium D. oxygen . CAN SOMEONE HELP ME, PLEASEEE :D
asked by lalt on May 23, 2012 -
Electronic
A metal plate infused with excess electrons will attract a proton placed nearby?
asked by Ruby on July 16, 2018 -
physics
What is the charge of a bare Magnesium nucleus (no electrons, just the protons and neutrons) in Coulombs?
asked by Anonymous on November 10, 2013 -
Atoms- Science
Elements having 3 or fewer electrons in the outer energy level are classified as ____________________.
asked by Twilight lover on February 8, 2009 -
chemistry
What is composed of atoms in fixed proportions? A. mixtures B. compounds C. electrons D. elements
asked by junior on September 14, 2010 -
College Chemistry
What is the molecular shape of ethylene (C2H4)? And what is the number of electrons that the carbons share between them?
asked by Anonymous on January 21, 2012 -
Physics
The discreteness of the energy levels of electrons about the atomic nucleus is best understood by considering the electron to be a .....?
asked by Beth on April 4, 2008 -
Chemistry
Determine the maximum number of electrons that can have each of the following designations. 2f,1Py,2Pz,5dyz,6f
asked by Farha on October 28, 2012 -
Chemistry
Give the maximum number of electrons in an atom that can have the following set of quantum numbers. (a) n=4 (b) n = 5, ml = 1, (c) n = 5, ms = 1/2
asked by Mahnoor on November 19, 2014 -
chemistry
State the number of valence electrons for an iron(II) ion in an ionic bond.
asked by blank on November 25, 2014 -
chemistry
how many protons, electrons, and neutrons are in the following isotopes. uranium-235 hydrogen-3 silicon-29
asked by monique n on December 2, 2010 -
chemistry
State the number of valence electrons for a chloride ion in an ionic bond.
asked by blank on November 25, 2014 -
Physics
How much work must be done to bring three electrons from a great distance apart to 1.0 * 10^(-10)m from one another (at the corners of an equilateral triangle)?
asked by Jenish on February 1, 2008 -
chem
1. Why can't you have 3 electrons in one orbital? 2. Why does Indium break the left to right trend for ionization energy?
asked by Jared on January 22, 2008 -
chem
How can the energy levels of electrons be determined by measuring the light emitted from the atom?
asked by Amanda on November 8, 2007 -
Science
state the number of electrons either lost or gained in forming each ion. Br- As3-
asked by Kelly on April 25, 2007 -
Chemistry
Given the following three electron configurations: 1s2 2s2 2p5 How many core electrons does this element have? A. 4 B. 5 C. 9 D. 2
asked by Megan on July 10, 2016 -
physics
a small pith ball carries a charge of -1.3 uc. how many excess electrons does this represent?
asked by ann on May 17, 2012 -
chemistry
State the number of valence electrons for an iron(II) ion in an ionic bond.
asked by McKenzie on November 26, 2014 -
Chemisty
Write the symbols of the family of elements that have seven electrons in their outermost energy level.
asked by M on January 16, 2008 -
science atoms
Elements having 3 or fewer electrons in the outer energy level are classified as ____________________.
asked by Twilight lover on February 8, 2009 -
physics
Calculate the net charge on a substance consisting of a combination of 6.7 ✕ 10^13 protons and 3.0 ✕ 10^13 electrons.
asked by Makenzie on March 28, 2015 -
Physics
How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.0 ìC?
asked by Arnold Manguy on April 19, 2010 -
Chemistry
How do valence electrons play a part in the physical or chemical charactersitics of an element?
asked by Lauren on November 11, 2011 -
science
If 2.7 moles of copper metal was deposited from a solution of Cu(NO3)2, how many electrons were involved?
asked by Andrea on April 18, 2013 -
math
Calculate the missing values for Protons, Neutron, and Electrons for the following element Germanium - Ge
asked by jennifer on December 3, 2018 -
Bio
why does pH of the matrix increase when electrons flow along the electron transport chains of mitochondria?
asked by Jin on February 13, 2008 -
Physics
Can someone explain why electrons cannot exist in orbitals and why we need to describe their location in terms of probabilities.
asked by Anonymous on June 6, 2013 -
science
What is all matter made up of? Are you searching for atoms, electrons and/or protons? I hope this helps. Thanks for asking.
asked by Jenna on March 28, 2007 -
Biology
What role do high-energy electrons play in the electron transport chain?
asked by Jim on January 11, 2011 -
chemistry
if 4.4 moles of copper metal was deposited from a solution of Cu(NO3)2, how many electrons were involved?
asked by scott on November 21, 2011 -
physics
how many electrons must be removed from an electrically neutral silver dollar to give a charge of +2.8 uc
asked by Anonymous on November 18, 2009 -
College Electric Physics
(a) What is the electric potential energy in joules of two electrons separated by 1.98 nm? (b) What would be it be if the separation was doubled?
asked by Bob on February 11, 2011 -
physics
How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.1 µC?
asked by Anonymous on February 7, 2011 -
chemistry
calculate the velocities of electrons with de Broglie wavelengths of 1.0x10^2nm and 1.0nm
asked by joanne on September 23, 2010