1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. 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
  34. 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
  35. 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
  36. 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
  37. 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
  38. 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
  39. 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
  40. 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
  41. 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
  42. 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
  43. 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
  44. 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
  45. 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
  46. 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
  47. 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
  48. 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
  49. 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
  50. 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
  51. 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
  52. 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
  53. 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
  54. 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
  55. 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
  56. 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
  57. 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
  58. 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
  59. 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
  60. 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
  61. chemistry

    how many unpaired electrons are in this configuration 1s2 2s2 2p6 3s2 3p3

    asked by Emmanuel on January 18, 2017
  62. chemistry

    how many unpeeled electrons are in this configuration 1s2 2s2 2p6 3s2 3p3

    asked by Emmanuel on January 18, 2017
  63. 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
  64. Chemistry

    What are transferred in an oxidation-reduction reaction? atoms*** electrons ions protons

    asked by Holly on May 19, 2016
  65. biology

    an atom that gains for loses electrons has an electrical charge and is called an _____.

    asked by greg on September 13, 2010
  66. 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
  67. Electronic

    A metal plate infused with excess electrons will attract a proton placed nearby?

    asked by Ruby on July 16, 2018
  68. 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
  69. Atoms- Science

    Elements having 3 or fewer electrons in the outer energy level are classified as ____________________.

    asked by Twilight lover on February 8, 2009
  70. chemistry

    What is composed of atoms in fixed proportions? A. mixtures B. compounds C. electrons D. elements

    asked by junior on September 14, 2010
  71. 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
  72. 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
  73. 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
  74. 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
  75. chemistry

    State the number of valence electrons for an iron(II) ion in an ionic bond.

    asked by blank on November 25, 2014
  76. 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
  77. chemistry

    State the number of valence electrons for a chloride ion in an ionic bond.

    asked by blank on November 25, 2014
  78. 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
  79. 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
  80. 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
  81. Science

    state the number of electrons either lost or gained in forming each ion. Br- As3-

    asked by Kelly on April 25, 2007
  82. 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
  83. 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
  84. chemistry

    State the number of valence electrons for an iron(II) ion in an ionic bond.

    asked by McKenzie on November 26, 2014
  85. 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
  86. science atoms

    Elements having 3 or fewer electrons in the outer energy level are classified as ____________________.

    asked by Twilight lover on February 8, 2009
  87. 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
  88. 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
  89. Chemistry

    How do valence electrons play a part in the physical or chemical charactersitics of an element?

    asked by Lauren on November 11, 2011
  90. 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
  91. math

    Calculate the missing values for Protons, Neutron, and Electrons for the following element Germanium - Ge

    asked by jennifer on December 3, 2018
  92. 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
  93. 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
  94. 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
  95. Biology

    What role do high-energy electrons play in the electron transport chain?

    asked by Jim on January 11, 2011
  96. 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
  97. 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
  98. 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
  99. 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
  100. chemistry

    calculate the velocities of electrons with de Broglie wavelengths of 1.0x10^2nm and 1.0nm

    asked by joanne on September 23, 2010