1. Physics

    If 0.01% of electrons are removed from 18 gm water, then calculate the charge produced in the water.
  2. physics

    How many electrons pass through a wire in 5 minutes, if the current through a wire is 400 mA
  3. chemistry

    A certain element forms an ion with 54 electrons and a charge of +2. Identify the element.
  4. chemistry

    in an element on the periodic table, which number tells you the how many electrons are in that element??
  5. chemistry

    When you touch an object, does the electrons from your hand exchange photons with the object?
  6. CHEMISTRY

    How many electrons are there in the p-orbital of a CH3 RADICAL (CH3.) I don't understand how it is 3.
  7. science

    A hydrogen atom has one proton, two neutrons, and no electrons. Is this atom an ion?
  8. Chemistry

    How many electrons are there in the p-orbital of a CH3 RADICAL (CH3.) I don't understand how it is 3.
  9. chemistry

    The number of protons in an anion must always be ________ the number of electrons. the same as We can’t tell. less than greater than
  10. Physics

    2.0x10^13 electrons flow through a transistor in 1.0ms. What is the current through the transistor?
  11. physics

    A metal sphere has a charge of +6.4 C. What is the net charge after 4.1 x 1013 electrons have been placed on it?
  12. please ..chem

    When you touch an object, does the electrons from your hand exchange photons with the object?
  13. 5th grade

    The gravitational force on the moon is one -sixth of what it is on Earth. This means that on the Moon you would weigh one-sixth of what you weigh on Earth. How much would you weigh on the moon.
  14. History

    What Demographic Transition Model stage is Belize, Cuba, GReece, Swaziland, Switzerland, Vietnam, South Korea, Niger, Uruguay,and Haiti in? Is there a website to get accurate answers? I think Belize is stage 2, Cuba is stage 3, Greece is 4, Swaziland 3,
  15. Physics

    If the moon were twice as massive, would the attractive force of Earth on the moon be twice as large? Yes No What about the attractive force of the moon on Earth? Yes No
  16. math

    I have a math problem. A Mars year is 1.88 Earth years. If you are 13 years old in Earth years, about how would you be in Mars in Mars years? Thanks
  17. Physics

    In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 2.20 104-m length of wire was let out by the space shuttle Atlantis to generate a motional emf. The shuttle had an orbital speed of 7.50 103 m/s, and the
  18. Algebra 1 Scientific Notation

    Isaac newtons theory of universal gravitation states that the equation F=G m^1m^2/r^2 can be used to calculate the amount of gravitational forces in newtons between 2 point masses (m^1) and (m^2) separated by a distance (r). G is a constant equal to
  19. Physics

    In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 2.20 104-m length of wire was let out by the space shuttle Atlantis to generate a motional emf. The shuttle had an orbital speed of 7.50 103 m/s, and the
  20. Physics

    The mass of a star in a galaxy far, far away, is 2.13 × 105 Earth masses, and the mean distance from the center of this star to the center of a planet with the same mass as our Earth is 7.87 × 108 km. Treating this planet and star as particles, with each
  21. Ap physics 1

    The mass of a star in a galaxy far, far away, is 3.12 × 105 Earth masses, and the mean distance from the center of this star to the center of a planet with the same mass as our Earth is 2.46 × 108 km. Treating this planet and star as particles,with each
  22. Environmental Science

    29. A common feature of thermal pollution and artificial eutrophication is that they both a. have sources that are difficult to identify and control b. cause large mats of algae to bloom in fresh water c. are a result of power plants and other industrial
  23. calculus

    newtons law of gravitation says that the magnitude F of the force exerted by a body of mass m on a bod of mass M is F=GmM/r^2 where G is the gravitational constant and r is the distance between the bodies. a)find dF/dr and explain its meaning. What does te
  24. physics

    As part of a sinister plot, I connect a piece of high-purity GaAs 1 cm long to a 9 V battery, at room temperature. What is the resulting drift velocity of the electrons? Your answer should be in cm/s
  25. chemistry

    how many protons and nuetrons are contained in the nucleus of each of the following atoms? assuming each atom is uncharged, how many electrons are present? a. 235/92U b. 13/6C c. 57/26Fe d. 208/82Pb e. 86/37Rb f. 41/20Ca
  26. Physics

    An electron in a television CRT moves toward the front of the tube with a speed of 7.5x10^6 m/s. A magnetic field of 0.04T (on a 50 degrees angle) causes the electrons to accelerate. Determine the acceleration
  27. Chemistry

    In a closed container 1L of chlorine reacts with 1L of nitrogen and 1L of hydrogen. I need to give lewis structure, vsepr, box notation for valence electrons etc. (i know how to do this) But I'm doubting on what the reaction equation would be.
  28. science

    I am studying science at GCSE. I a working through a revision book and have come across a question which i am unsure of the answer. The question is, "state the number of different elements present in C6H5CO2Na." The answer i have is 14 but still i am
  29. math

    Sam and markus are standing on level ground 100m apart. A large tree is due north of markus and on a bearing of 65degrees from sam. The top of the tree appears at an angle of elevation of 25degrees to sam and 15degrees to markus. Find the height of the
  30. Chem

    Hello What is the wavelength (in nm) of the line in the spectrum of the hydrogen atom that arises from the transition of the electron from the orbital with n =5 to the orbital with n = 2? Note, the line corresponds to the energy of the photon that is
  31. physics

    Relative to the ground, a car has a velocity of 14.4 m/s, directed due north. Relative to this car, a truck has a velocity of 24.8 m/s, directed 52.0° north of east. What is the magnitude of the truck's velocity relative to the ground?
  32. Trig/Physics

    Joe walks 5 miles in the direction degrees North of East, and then 10 miles in the direction 20 degrees West of North. (a) How far is Joe from his starting position? (b) In what direction is Joe from his starting position?
  33. Physics

    Relative to the ground, a car has a velocity of 14.8 m/s, directed due north. Relative to this car, a truck has a velocity of 24.0 m/s, directed 52.0° north of east. What is the magnitude of the truck's velocity relative to the ground?
  34. physical science

    A kg ball of lead rests next to a 10 kg rock. which statement below is true:a:the lead ball and rock have the same amount of inertia,b:if the lead ball and the rock fell from the same height in a vacuum, the rock would hit the ground first because it is
  35. physics

    A satellite orbits a planet at a distance of 3.80 108 m. Assume that this distance is between the centers of the planet and the satellite and that the mass of the planet is 3.90 1024 kg. Find the period for the moon's motion around the earth. Express the
  36. Social Studies

    1. How has South Carolina changed politically since the 1970s? (1 point) ~County governments were eliminated. ~Race has become the most important political issue.***** ~The Democratic Party has gained more power in the state. ~The Republican Party has
  37. Organic Chemistry

    What is the mechanism of action between between benzoic acid (C6H5COOH) and sodium bicarbonate (NaHCO3)? I need to know where the electrons go in the acid-base reaction.
  38. chemistry

    what is the binding energy of an electron in a photosensitive metal (in kj/mol) if the minimum frequency of light that can eject electrons from the metal is 6.3 x 20^14 Hz?
  39. Pre-AP Science

    an atom consists of 10 neutrons ,10 electrons,and 9 protons. The atom has gained an electron resulting in a charge of -1. What is its mass number?
  40. science

    i have a work sheet to do it gives me the atomic number and the mass number of elements i have to fill in the missing electrons protons neutrons
  41. Physics

    At what distance from a carbon nucleus is the electric potential 1.8 V? Carbon atoms have 6 electrons in the atomic shell ...im very confused with this question, please help!
  42. physics

    Problem 22.2 2 *10^13 electrons flow through a transistor in 1.0ms . Part A - What is the current through the transistor? Express your answer using two significant figures. in mA
  43. SCIENCE HELP ASAP

    1. in an atom, electrons_____ 2. dot diagrams are used to represent_______ 3. the maximum number of electrons in the second energy level of an atom is________
  44. physics

    at what distance would repulisve force between two electrons have a magnitude of 2.00 n between two protons ? 2=kq1q2/r^2 r^2 = 9.0 x10^9 x (1.6 x 10^-19)^2 So, what is the R, on my answer from, this is 1.07 x10^-14m, however, I cannot get this, can you
  45. Science

    A 6.0 volt battery is hooked up to a light bulb, whose resistance is 3.1 ohms. How many electrons would leave the battery per second? (Hint: 1 electron = 1.6E-19 C)
  46. Chemistry

    A metal foil has a threshold frequency of 5.45× 1014 Hz. Which of the colors of visible light have enough energy to eject electrons from this metal.
  47. chemistry

    Please explain this to me 2I- --> I2 + 2e Cr2O72- ==> Cr3+ 6e + 14H + Cr2O72- ==> 2Cr3+ + 7H20 I don't understand how the left side gets 6 electrons.
  48. physics

    two identical copper spheres are separated by 1m in vacuum. how many electrons would have to be removed from one sphere and added to other sphere so that they attract each other with force of 0.9N
  49. physics

    Calculate the net charge on a substance consisting of a combination of 8.9 × 10 13 protons and 2.6×10 13 electrons. The elemental charge is 1.6 × 10 −19 C. Answer in units of C
  50. Chemistry

    Examine the redox reaction. As2O3(s) + Cl2(g) + H2O(l) → H3AsO4(aq) + HCl(aq) How many electrons are lost by each As atom during the reaction? A)4 B)3 C)2 D)1
  51. Write the shorthand notation

    Write the shorthand notation and the orbital diagram electron configuration representation for each of the following elements and indicate the orbital(s) which contain valence electrons: (a) N, (b) K, (c) Cu, (d) Al.
  52. Chemistry

    What is the electron configuration called that has 18 electrons in the outer energy level and all of the orbitals filled? Noble gas configuration
  53. Marianne

    Fill in the blank: The electrons follow a ________ path when they are deflected in a magnetic field due to the magnetic force.
  54. Physics

    When two identical ions are separated by a distance of 5.9 multiplied by 10-10 m, the electrostatic force each exerts on the other is 6.0 multiplied by 10-9 N. How many electrons are missing from each ion?
  55. Physics E&M

    Three electrons form an equilateral triangle 1.00 nm on each side. A proton is at the center of the triangle.What is the potential energy of this group of charges?
  56. Physics

    In a computer monitor, an electron beam with a current of 4x10^-6 A is directed at the screen. How many electrons are transferred to the monitor in 2 minutes.
  57. Astrophysics

    The Earth formed at a redshift of z∼0.53. That means that when our world was young, the universe was quite a bit smaller than it is today. The nearest galaxies to our own are around 10 kpc (kilo-parsecs) in size, lie at a distance of around 1 Mpc from us
  58. english fixed-3

    here's what i did for number 4. The world is deserting because we are taking water for granted. If people continue to waste water, the earth’s structure will change and it will be the main cause of earthquake and potentially a tsunami. and for number 5.
  59. Physics

    At what rate will a pendulum clock run on the Moon, where the acceleration due to gravity is 1.63 m/s2 , if it keeps time accurately on Earth? That is, find the time (in hours) it takes the clock’s hour hand to make one revolution on the Moon. provide
  60. Language

    People have been making maps for hundreds of years. Christopher Columbus used maps when he sailed to the "New World." At that time, most people thought Earth was flat, and all of the maps they used were flat, too. Of course, Columbus's maps were not
  61. Earth

    1. If the Earth were the size of B-B (with a radius of about 0.2 centimete), how big would the Sun be? How big would the Milky Way be? 2. Imagine building a model of the Solar System on your campus. Work out the diameter and spacings of the planets in
  62. Calc

    Recent studies indicate that the average surface temp. of the earth has been rising steadily. Some scientists have modeled the temp. by the linear function T= 0.02t + 8.50, where T is temp. in degrees Celsius and t represents years since 1900. What do the
  63. history

    Please verify: the workers that were generally better off in America than Europe before 1860 would have been the skilled workers? The most important iron manufacturing center in the South was the Atlanta Iron Foundry? Utopian societies emerged in the
  64. Physics

    1) Find the magnitude of the gravitational force a 68.6 kg person would experience while standing on the surface of Earth with a mass of 5.98 × 10 24 kg and a radius of 6.37 × 10 6 m. The universal gravitational constant is 6.673 × 10 −11 N · m2 /kg
  65. History

    4. South Carolina responded to the Intolerable Acts by __________. (1 point) holding small “tea parties” in Charles Town and Georgetown sending representatives to the First Continental Congress drafting a state constitution and setting up a new
  66. Maths

    A straight river flows at a speed of 20km/h. A boater starts at the south shore and heads in ths direction of 70degrees from the shore. The boat has a speed of 20km/h in still water. Find the true speed and direction of the boat.
  67. Pre calculus, vectors

    A straight river flows at a speed of 20km/h. A boater starts at the south shore and heads in ths direction of 70degrees from the shore. The boat has a speed of 20km/h in still water. Find the true speed and direction of the boat.
  68. history

    What would be a good thesis statement for my intro paragraph? Effect and Evolution of African Americans in Minnesota Intro The first Great Migration occurred after the Civil War and after the 13th amendment was passed. With the passing of the 13th
  69. physics

    What is mean by 28degree east of north
  70. Social Studies

    How many states are in North America?
  71. science

    where does energy come from in north carolina
  72. history

    what was napolean like in the north america?
  73. physics

    750km towards North West?
  74. 6th grade

    most of the islands in north belong to
  75. physics

    It has been suggested, and not facetiously, that life might have originated on Mars and been carried to Earth when a meteor hit Mars and blasted pieces of rock (perhaps containing primitive life) free of the surface. Astronomers know that many Martian
  76. Science

    Does the Earth and moon have large molten core or only 1 of them does? I think the Earth only has large molten core
  77. chem

    What is the wavelength (in nm) of the line in the spectrum of the hydrogen atom that arises from the transition of the electron from the orbital with n =5 to the orbital with n = 2? Note, the line corresponds to the energy of the photon that is emitted in
  78. Geology

    Can someone please look this over and let me know if I described the Plate Tectonic Theory? Thanks. Write a 200-300-word summary about two historical figures and the process of mantle convection and plate movement. Two historical figures that contributed
  79. geology

    How old are the oldest meteorites yet studied and what is the minimum age of Earth since Earth is at least as old as the meteorites. We know the oldest meteorites contain equal amounts of uranium 238 and lead 206. Uranium 238 has a half life of 4.5 billion
  80. Physics

    A 7410-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the
  81. Physics

    A 7410-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the
  82. science

    1. Scientists hypothesize that the sun formed ____. (1 point) less than a billion years ago from a cloud of gas and dust less than a million years ago from a chunk of Jupiter 2. Two of the inner planets are ____. (1 point) Venus and Saturn Mars and Venus
  83. physics

    An aircraft is flying at the speed of 354km/hr relative to the air is observed from the ground to have a velocity of 300km/hr in the north east direction. The wind is blowing from east. Find the speed of the wind and the direction to which the aircraft is
  84. Physics

    Two movers push horizontally on a refrigerator. One pushes due north with a force of 150 N and the other pushes due east with a force of 200 N. (a) Find the direction and magnitude of the resultant force on the refrigerator. (b)Show that the result of the
  85. math

    Two helicopters leave Springfield, IL at the same time. One travles north at 27 miles per hour and the other travels west at 120 miles per hour. How far apart are they after 3 hrs? (Hint: Use d=rt to find the distance traveled by each helicopter.) I know
  86. Environmental Problems

    Where in the US and Canada is deforestation, air pollution, water pollution, and climate change happening? San Francisco Aereas near all population centers would be the most acute, as you get further North the polution is less and, the deforestation is
  87. Geometry

    Eratosthenes knew that in Aswan the sun was directly overhead at noon on the summer solstice. At the same time, he measured the angle of the sun to a vertical line in Alexandria. He found this angle to be one(1/50) fiftieth of a circle a. What was
  88. 7th grade Science help

    1. _______ is energy that flows from an object with a higher temperature to an object with a lower temperature. (1 point) Heat Radiation Potential Chemical 2. The transfer of energy that occurs when molecules bump into one another is called _____. (1
  89. physics

    A cyclist starts from point X and rides 3 km due west to point Y. At Y he changes direction and rides 5km north-west to point Z. (a) hw far is he from the starting point, correct to the nearest km? Find the bearing of the Z frm X to the nearest degree?
  90. trig

    two trains leave Kansas City at the same time. Train A is traveling due north at 55 mph, train B is traveling west at the rate of 65 mph. Find the distance between the two trains two hours later and the bearing of train B from train A.
  91. astronomy

    Calculate the tidal force experienced by Io. How does it compare to the tidal force experienced by the Moon due to the Earth? What would the Earth-Moon distance (i.e., distance between their centres) need to be in order for the Moon to experience similar
  92. physics

    Calculate the tidal force experienced by Io. How does it compare to the tidal force experienced by the Moon due to the Earth? What would the Earth-Moon distance (i.e., distance between their centres) need to be in order for the Moon to experience similar
  93. physics

    An unsuspecting bird is coasting along in an easterly direction at 4.00 mph when a strong wind from the south imparts a constant acceleration of 0.300 m/s2. If the acceleration from the wind lasts for 2.70 s, find the magnitude, r, and direction, θ, of
  94. Physics

    Calculate the net charge on a substance con- sisting of a combination of 7.2 × 1013 protons and 4.8 × 1013 electrons. Answer in units of C
  95. E& M physics

    Three electrons form an equilateral triangle 0.600 nm on each side. A proton is at the center of the triangle. What is the potential energy of this group of charges?
  96. chem

    CF4 how would you determine the molecular shape using vsepr? i got that it has 32 electrons and four bonds. im stuck on how to get the non bonding domains and shape and bond angle! thanks!
  97. physics

    Calculate the net charge on a substance con- sisting of a combination of 6.5 × 1013 protons and 2.0 × 1013 electrons. Answer in units of C.
  98. Math

    The avearage velocity of the electrons in a conductor carrying a current of 65.5 ampere is 0.0153 inches per second. What is the cross sectional area of the conductor?
  99. physics

    2.4 ampere current is flowing in a wire .how many electrons pass a given point in the wire in one second if the charge on an electron is 1.6x10 power -19 couloms.
  100. Science

    4. 3 elements are listed by atomic number, #19, 20, and 21. Which property do all of these elements have in common? They are all brittle. They all have 4 valence electrons. They are all malleable. ***** They shatter easily.