1. Physics

    What is the reaction of the earth pulling down on a pen that is lying on a table
  2. Physics HW Plz help

    What is the frequency of a blue light with a wavelength of 487nm?
  3. Physics

    What is the peak wavelength and observed color of a 50,000 K star?
  4. physics

    what is thw momentum of an object of mass 10Kg at rest?
  5. Physics

    During the pre-industrial era, what were the Carbon Dioxide levels like?
  6. physics

    claculate the force of gravity between two identical balls 8kg each, if they are 5m apart?
  7. Physics

    How does the length, thickness, and temperature of a wire effect the resistance?
  8. Physics

    17. Explain how water can transfer energy by conduction and by convection.
  9. physics

    Does the kinetic energy of a car change more when it speeds up from 10 to 15 m/s or from 15 to 20 m/s? Explain.
  10. physics

    how much work is being done if a 100 N box is lifted 3 meters off the ground???
  11. Physics

    Problem2-AFor A=-I+2j +5k and B=2j-3k,find: a) The dot productA.B b) The angle between the A and B
  12. Physics

    What is the minimum uncertainty in the velocity of an electron that is known to be somewhere between 0.050 nm and 0.10 nm from a proton
  13. physics

    why does the total mechanical energy on a roller coaster stay the same?
  14. physics

    describe how the values of resisitivity determine the uses of material in industry ???
  15. Physics

    how does the MA and the IMA of the inclined plane vary with the inclination angle?
  16. physics

    density of silves is 10.5 X 10^3 kg/m^3. find the volume occupied by 2 kg of silver.
  17. physics

    What is the temperature of 0.54{\rm mol} of gas at a pressure of 1.3{\rm atm} and a volume of 10.9{\rm L} ?
  18. physics

    Why the mesaure of the sphere doesn't play a part at the pendulum???
  19. Physics

    how does the MA and the IMA of the inclined plane vary with the inclination angle?
  20. Physics

    Two identical charges are 36 mm apart. The electrostatic force between them is 1.3 N. What is the size of each charge?
  21. Physics (easy level)

    What would a Potential energy to velocity^2 graph be?
  22. Physics

    A force of 0.20N acts on a mass of 100g. What is the acceleration?
  23. physics

    what happens to the force of frictionif the coefficient of friction was reduced by one thrid
  24. Physics

    Calculate the resultant force of 5N and 5N ac ting at an angle 90 degree
  25. PHYSICS

    Why do objects gain mass while approaching the speed of light
  26. physics

    if the initial velocity is .05 m/s and its final is 1.3 m/s then how much energy is lost to friction
  27. Physics

    How much energy is required to ionize hydrogen when it is in the state with n = 6? (answer in eV)
  28. physics

    Does the kinetic energy of a car change more when it speeds up from 10 to 15 m/s or from 15 to 20 m/s? Explain.
  29. physics

    what happens when a resistor is used to heat a brass rod and allowed to cool?
  30. Physics

    Find the density of a 5.8- solid cylinder that is 15 cm tall with a radius of 5.0 .
  31. physics

    Explain the difference between a GET and MOSFET on the basis of their construction and working
  32. Physics

    Can anyone write a mathematical equation to represent Charles law?
  33. Physics

    What are the components of a vector with a magnitude of 4.00 and a direction of -122 degrees?
  34. sonogram physics

    How much time is required to image a structure at 5cm.?
  35. physics

    What kind of motion makes the pendulum when the amplitudes are small ????
  36. physics

    Distance travelled by a ball dropped from a cliff in the 10th second.
  37. Fallacy

    My assignment is to find fallacies in a newspaper editorial and a opinion magazine. I am having trouble understanding what a fallacy is. I know that it is a false or misleading argument. I am not understanding how to detect fallacy. Everything I read doesn't have any ...
  38. PHYSICS

    ADDITIONAL INO ADDED AT BOTTOM a spectator at a hockey game is sitting in a seat situated 10.4m above ground leve. if the spectator has a mass of 52.6 kg, calculate her gravitational potential energy relative to: a)ground level Eg=mgh =52.6X9.8X10.4 =5360.99J b)the ice surface...
  39. bobpursley

    ok im doing my physics homework and we have to submit the answers online. i keep getting these questions wrong and i only have one more try can someone please tell me how to work it? a 2.5 kg otter starts from rest at the top of a muddy incline 94.6 cm long and slides down to ...
  40. Physics Newton law

    A 10O0Kg elevator is hoisted upward from rest by a cable. In the first two seconds there is an 1100N tension force in the cable hoisting the elevator. What is the speed after two seconds and how far has it travelled ? Get the acceleration first. Tension=mg + m*acceleration. ...
  41. English

    English - Writeacher, Thursday, September 1, 2011 at 11:35pm 1, 2, and 2-1 -- correct 3. The eighth square on the second row needed 256 spoons of rice, and they amounted to a bowl. incorrect I said this was incorrect because it's not clear what the antecedent for "they" is. Is...
  42. chemistry

    Q: I just did an online chemisty lab for Oxidation States of Manganese and I'm stuck. I have three test tubes that have been prepared as follows: Tube 1- Starting PH 13.82 2 mL of KMnO4 1 mL of NaOH Tube 2- Starting PH 7 2 mL of KMnO4 Tube 3- Starting PH 0 2 mL of KMnO4 1 mL ...
  43. English

    1.Read the following paragraphs from "behind the veil." The street, although why was inconveniently full of strollers passing to and fro. The situation was not helped by the sleek swift cars, which sped by from time to time. They carried wealthy occupants, young women, and ...
  44. language help !

    In all of recent American history, there has been no worse river flooding than what occurred on the Mississippi River between late June and the middle of August in 1993. Record flooding affected communities from Minnesota to Missouri. Iowa and Illinois joined those states as ...
  45. Physics

    I have no idea!!! A river flows due south with a speed of 2.30 m/s. A man steers a motorboat across the river; his velocity relative to the water is 4.50 m/s due east. The river is 900 m wide. In which direction should the motorboat head in order to reach a point on the ...
  46. history

    You're a famous movie producer. Large historical epics have become very popular, and you want to get in on the action. You need to develop a proposal to "pitch" to a movie studio. But what hasn't been done? Ben-Hur and Spartacus were big hits in the 1950s, and now seems the ...
  47. Physics help

    Are you sure that's how you do #4 because they have 2 different directions. I need physics help. I don't understand how to do these questions. Can someone show me what I should use? and explain. I'll do calculations by myself. A stationary curling stone is struck in a glancing...
  48. U.S. History (Check) (Reed)

    1. When the Vietnam War ended... a) Many Americans wanted to return and win b) Many Vietnamese wanted to leave the county for the safety of America c) Many people still trusted the government and its decisions A: b? 2. Roughly how many soldiers were killed in the Vietnam War? ...
  49. physics multiple choice

    A 3.00 lb. physics book rests on an ordinary scale that is placed on a horizontal table. The reaction force to the downward 3.00 lb force on the book is A. an upward 3.00 lb force on the scale due to the table. B.an upward 3.00 lb force on the book due to the scale. C.an ...
  50. physics multiple choice

    A 3.00 lb. physics book rests on an ordinary scale that is placed on a horizontal table. The reaction force to the downward 3.00 lb force on the book is A. an upward 3.00 lb force on the scale due to the table. B.an upward 3.00 lb force on the book due to the scale. C.an ...
  51. English essay

    Hi everybody, I have to write an essay in English(which is not my mother tongue) on the subject: Are you personnally in favor of legalising gay marriage? I've written a short essay about it. Can anyone correct my mistakes and my ideas(if you find that the arguments are not ...
  52. Health (Ms. Sue)

    1. Summarize the steps to designing a fitness program. A: The steps to designing a fitness program. First, you must determine your resting heart rate. Once you have determined your resting heart rate, you need to calculate your target heart rate zone. Calculating this will ...
  53. Physics repost

    Posted by Mary on Saturday, October 6, 2007 at 5:13pm. Suppose you wish to make a solenoid whose self-inductance is 1.2 mH. The inductor is to have a cross-sectional area of 1.2 10-3 m2 and a length of 0.048 m. How many turns of wire are needed? For Further Reading Physics ...
  54. Physics

    Two 0.09g pith balls are suspended from the same point by threads 40cm long. (Pith is a light insulating material once used to make helmets worn in tropical climates.) When the balls are given equal charges, they come to rest 19 cm apart What is the magnitude of the charge on ...
  55. psych 210 appendix c

    Axia College Material Appendix C Match the psychological theories with the appropriate statement(s): __Psychodynamic Theory __Trait Theory __Learning Theory __Sociocultural __Humanistic Theory A. Individualism versus collectivism B. Popular theorist Eysenck initiated the five-...
  56. Physics

    A planet has two satellite moons. Moon X has an orbital period of 2.13 days. Moon Y has an orbital period of about 3.53 days. Both moons have nearly circular orbits. Use Kepler's third law to find the distance of each satellite from the planet's center. The planet's mass is 2....
  57. Chemistry PLEASE HELP!!

    Questions: 1. In each test tube, a precipitate formed upon DROPWISE addition of the second reagent (steps 5 and 6). What are these precipitates? (a) First test tube with HgCl©ü : (b) Second test tube with SnCl©ü : 2. In each test tube, which reagent was limiting and which ...
  58. Chemistry

    Questions: 1. In each test tube, a precipitate formed upon DROPWISE addition of the second reagent (steps 5 and 6). What are these precipitates? (a) First test tube with HgCl©ü : (b) Second test tube with SnCl©ü : 2. In each test tube, which reagent was limiting and which ...
  59. languge arts reading help

    You are driving down a road o the main highway near Deming, New Mexico. Suddenly, in the midst of a mesa of tall yellow grass, you see amazing columns of stones. Some stones are forty feet tall. As you get closer, you see that other stones form arches, and still others appear ...
  60. Grammar (Writeacher)

    On your paper, rewrite the following sentences that contain errors in the use of modifiers. Write "correct" if a sentence contains no errors. 1. Winter visits only one hemisphere, northern and southern, at a time. 2. In December, January, February, and March, the Northern ...
  61. physics

    An inquisitive physics student, wishing to combine pleasure with scientific inquiry, rides on a rollercoaster sitting on a bathroom scale. (Do not try this yourself on a rollercoaster that forbids loose heavy packages.) The bottom of the seat in the rollercoaster car is in a ...
  62. physics

    Show that the magnitude of the charge on a capacitor is given by Q = (Qo(1-e^-(t/T))) and Q = Qoe^-(t/T) for charging and discharging, respectively.
  63. Physics

    I am not getting the difference between distance and displacement.... without using the words scalar and vector quantity, of course, i know what they mean but still i need help with this... so please help!!!
  64. physics

    how much energy is gain by an electron accelerated through a potential differenc of 30000v?
  65. Physics

    Charges q1 and q2 lie on the x-axis at points x= -a and x= +a respectively a) how must must q1 and q2 be related for the net force +Q placed at x= +a/2 to be zero?
  66. physics

    what are the methods of computing the veolicty of a particle in one- dimensona motion from a graph ?
  67. physics

    A piece of metal has a density of 0.20g/cm^3.what is the volume in cm^3 of a 1g sample of a substance?
  68. Physics

    If a 75-kg skater starts his skate at 8.0m, at his lowest point (height = 0), what is his velocity?
  69. physics

    What is the momentum of an automobile (weight = 9800 N) when it is moving at 36 m/s to the south? magnitude
  70. physics

    a 8.0 kg object undergoes an acceleration of 2.2 m/s squared.what is the resulting force acting on it?
  71. Physics

    Two resistors 3 Ù and 6 Ù are connected in parallel across a 6 V battery. What is the current flow through the 3 Ù resistor?
  72. physics

    Calulate the amount of substance io 120g of trioxocarbonate (iv)ion,co2
  73. physics

    how much energy was released by a 60 kg cannon shooting an 8 kg projectile horizontally at 50m/s?
  74. Physics

    A photon a. is a quantum of light b. is a wave c. means bundle of energy(I think it's this one)
  75. Physics

    In what part of the electromagnetic spectrum does the wavelength 0.0141 nanometers belong in?
  76. Physics

    Question: When a balloon is rubbed with fur, it becomes negatively charged. Explain why?
  77. Physics

    if the mass of two balls is 0.300 kg each then what is the gravitational force between them if the distance is 0.3000 m
  78. physics

    What capacitance is required to store an energy of 13 kW·h at a potential difference of 940 V?
  79. physics

    Calulate the amount of substance in 120g of trioxocarbonate (iv)ion,co2
  80. Physics

    How long is Mayra, a ballerina, in the air when she leaps straight up with a speed of 1.23 m/s?
  81. Physics check

    The spectral lines for elements are sometimes called atomic..... spectra?
  82. physics

    What's the speed of the Hubble telescope when it is in orbit 598 km above the earths surface?
  83. Physics

    If a racehorse starts from rest and accelerates at a rate of 4.7 m/s2, how long does it take the horse to go 20 m?
  84. physics

    A rotating cylinder about 16 long and 6.2 in diameter what angular speed must it rotate?
  85. physics

    The escape velocity on the moon is: a) 5.64x10^6 m/s b) 1.68x10^3 c) 160 m/s d) 2.38x10^3 m/s
  86. physics

    A 0.355-kg object undergoing SHM has ax = 2.30 m/s2 when x = 0.235 m. What is the time for one oscillation?
  87. physics

    A body of mass 20kg dropped from a height of 2m calculate the workdone?
  88. physics

    With V = Voe^-(t/T), how many time constants does it take for a capacitor to discharge less than 1% of its initial voltage?
  89. physics

    How many 160ohms resistors must be connected in parallel to draw a current of 6.0A from a 120V
  90. Physics(light)

    why the ray reflected by the prism is brighter than that by the plane mirror?
  91. physics

    A projectile is given an initial velocity of (i + 2j) m/s, where i is along the ground and j is along the vertical. If g = 10 m/s2, the equation of its trajectory is:
  92. physics

    If a nuclide has a decay constant of 10^-6 s-1 what is its half life ??? I think it is 0.693 / 10^-6 = 693000 or 6.93 x 10^5 Is this right ...
  93. Physics

    How long is Mayra, a ballerina, in the air when she leaps striaght up with a speed of 1.23 m/s?
  94. physics

    is the force exerted by the wall on the person’s hand passive or active?
  95. physics

    A 3 kg book is lifted 5 meters above the floor for 250 seconds. What is the work done?
  96. mathematical physics

    Solve the following ODE using the power series method (1-x^2)y"-2xy'+2y=0
  97. Physics

    How much work does a person do to lift 60000 a distance of 7.8 ft in 10s? How much power? Hp?
  98. physics

    5. What is the acceleration of a 20 N object that is pulled up a 30° incline by a 25 N force? The coefficient of friction is 0.30
  99. physics

    a cannon fire a .453 kg shell with initial velocity vi=9m/s in the direction 50
  100. physics

    5. What is the acceleration of a 20 N object that is pulled up a 30° incline by a 25 N force? The coefficient of friction is 0.30.
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