ashley --- HELP PLEASEE!!!

Most popular questions and responses by ashley --- HELP PLEASEE!!!
  1. physics

    A 3.1-kilogram gun initially at rest is free to move. When a 0.015-kilogram bullet leaves the gun with a speed of 500. meters per second, what is the speed of the gun?

    asked on May 7, 2011
  2. physics

    A 15.0-kilogram mass is moving at 7.50 meters per second on a horizontal, frictionless surface. What is the total work that must be done on the mass to increase its speed to 11.5 meters per second?

    asked on May 8, 2011
  3. physics

    A child, starting from rest at the top of a playground slide, reaches a speed of 7.0 meters per second at the bottom of the slide. What is the vertical height of the slide? [Neglect friction.]

    asked on May 8, 2011
  4. physics ---- really dnt get this at all

    A small electric motor is used to lift a 0.50-kilogram mass at constant speed. If the mass is lifted a vertical distance of 1.5 meters in 5.0 seconds, the average power developed by the motor is

    asked on May 8, 2011
  5. physics

    Monochromatic light passes through two parallel narrow slits and forms an interference pattern on a screen. As the distance between the two slits is increased, the distance between light bands in the pattern on the screen will 1) decrease 2) increase 3)

    asked on April 10, 2011
  6. physics

    What total mass must be converted into energy to produce a gamma photon with an energy of 1.03 × 10^–13 joule

    asked on May 8, 2011
  7. physics

    Two point charges +4q and +q are placed 30 cm apart. At what point on the line joining them is the electric field zero? (a) 15 cm from charge 4q (b) 20 cm from charge 4q (c) 7.5 cm from charge q (d) 5 cm from charge q

    asked on May 11, 2011
  8. physics

    In a lightning strike, a charge of 18 coulombs is transferred between a cloud and the ground in 2.0 × 10-2 second at a potential difference of 1.5 × 106 volts. What is the average current produced by this strike? 3.6 × 10-1 A 9.0 × 102 A 3.0 × 104 A

    asked on June 6, 2011
  9. is a wall a conductor?

    is a wall a conductor?

    asked on May 10, 2011
  10. physics

    Two point charges +4q and +q are placed 30 cm apart. At what point on the line joining them is the electric field zero? (a) 15 cm from charge 4q (b) 20 cm from charge 4q (c) 7.5 cm from charge q (d) 5 cm from charge q

    asked on May 11, 2011
  11. physics

    A total charge of 25 mC passes through a cross-sectional area of a nichrome wire in 10 s. What is the current in the wire? Choose one answer. a. 2.5 A b. 2.5 mA c. 25 mA d. 2.5 µA

    asked on May 31, 2011
  12. physics

    A current-carrying conductor experiences a force upward in a magnetic field that acts perpendicularly to and out of the plane of the paper. What is direction of the current in the conductor? Choose one answer. a. The current in the conductor is toward

    asked on June 4, 2011
  13. physics

    Two electrostatic point charges of +30 μC and +25 μC exert a repulsive force of 200 N on each other. What is the distance between the two charges?

    asked on May 11, 2011
  14. physics

    Several light bulbs, each of resistance 1.5 Ω, are connected in a series across a 120 V source of emf. If the current through the circuit is 2 A, how many light bulbs are there in the circuit?

    asked on May 23, 2011
  15. physics

    Consider a situation where immediately after birth, twins are separated. One continues to live on earth, while the other is whisked away in a space ship at 90% of the speed of light. After 65 years they are reunited. Will they look the same? I know that

    asked on June 7, 2011
  16. physics

    Four charges are placed at the four corners of a square of side 15 cm. The charges on the upper left and right corners are +3 µC and -6 µC respectively. The charges on the lower left and right corners are -2.4 µC and -9 µC respectively. The net

    asked on May 11, 2011
  17. physics

    A circular loop of area 0.8 m2 is inclined at an angle 60° in a uniform magnetic field of 0.4 Tesla. What is the magnetic flux associated with the loop? Choose one answer. a. 0.32 Weber b. 0.16 Weber c. 0.28 Weber d. 0.14 Weber

    asked on June 4, 2011
  18. physics

    A train is moving with a speed of 50 miles per hour. A man standing in the rear of a train car throws a ball toward the front of the train with a speed of 10 miles per hour. If a stationary observer outside the train sees this happen, what speed is the

    asked on May 1, 2011
  19. HiSTORY ....helpppppp

    why is yellow journalism important in the Spanish American war?

    asked on March 13, 2011
  20. physics

    Which of the following is correct for the charge in a magnetic field? Choose one answer. a. A stationery charge can experience a force in a magnetic field. b. A moving charge parallel to the direction of the magnetic field can experience a force. c. A

    asked on June 4, 2011
  21. physics

    A proton and an electron in a hydrogen atom are separated by a distance of 5.3 x 10-11 m. The magnitude and direction of electric field set up by the proton at the position of the electron is: a. 5.1 x1011 N/C away from the proton b. 5.1 x1011 N/C toward

    asked on May 14, 2011
  22. physics

    A moving proton with a speed of 0.3 m/s experiences a force of 1.5*10^-20N, when it enters at a right angle to the direction of the magnetic field. What is the magnitude of the magnetic field? Choose one answer. a. 0.3 Tesla b. 0.5 Tesla c. 0.9 Tesla d.

    asked on June 4, 2011
  23. physics

    A wire of length L m has 2 ohms resistance. It is stretched twice its original length and its area becomes half of its original area. What is its new resistance?

    asked on May 29, 2011
  24. physics

    What are the first, second, and third frequencies audible from a 20 cm long organ pipe when (A) only one end is open and when (B) both ends are open. The speed of sound through the air inside the organ pipe is 343m/s.

    asked on April 13, 2011
  25. physics

    if you attach a mass to the spring from its initial equilibrium position, it vibrates forever in simple harmonic motion. Why doesn't it come to rest after stretching by a distance 'd'; proportional to the weight of the mass, when the spring's restoring

    asked on February 27, 2011
  26. physics . really need help

    An electric iron of 500 W power is used daily for 30 minutes. If the cost per kW.h is $0.10, what is the weekly expense in using the electric iron??

    asked on May 21, 2011
  27. physics ---- really dnt get this at all

    A total charge of 25 mC passes through a cross-sectional area of a nichrome wire in 10 s. How many electrons pass through the cross-sectional area in 16 s? Choose one answer. a. 2.5 x 1017 electrons b. 2.5 x 1019 electrons c. 2.5 x 1016 electrons d. 2.5 x

    asked on May 31, 2011
  28. physics

    The period of a simple pendulum is measured to be 4.0 seconds in a frame of reference. Which of the following is correct when the period of the pendulum is measured by an observer moving with half the speed of the light? Choose one answer. a. The time

    asked on May 1, 2011
  29. physics

    A square coil of side 0.5 m is placed with its plane perpendicular to the direction of the magnetic field. What is the flux change in the coil if the magnetic field changes from 0.1 Tesla to 0.5 Tesla? Choose one answer. a. 0.1 Weber b. 0.2 Weber c. 0.8

    asked on June 9, 2011
  30. physics

    What is the resistance of the coil A at 600 kelvin if its resistance at 300 kelvin is 50 ohms? (Assume the temperature coefficient of resistance of the coil is .007/ degrees C)

    asked on May 29, 2011
  31. HiSTORY ....helpppppp

    Which of the following statements about the U.S. annexation of Hawaii is true? A. It was universally popular in the United States. B. The U.S. went to war with European powers to obtain the islands. C. It made both military and economic expansion in the

    asked on March 3, 2011
  32. physics

    A capacitor has a capacitance of 3 pF. What potential difference would be required to store a charge of 21 pC? Choose one answer. a. 3 V b. 21 V c. 7 V d. 0.14 V

    asked on May 14, 2011
  33. physics

    A conductor of length 0.8 m carrying a current of 2.5 A is kept in a magnetic field of 0.6 Tesla. What is the magnitude of the force experienced by the conductor if it is inclined at an angle 30° to the direction of the magnetic field? Choose one answer.

    asked on June 4, 2011
  34. physics

    The capacitance of a capacitor is 10 μF. The distance between the plates is made half and area is doubled. The capacitance of the capacitor will now be: i think its 20 im not sure tho

    asked on May 13, 2011
  35. physics

    A hollow metal ball carrying an electric charge produces no electric field at a point: is it inside the ball?

    asked on May 11, 2011
  36. physics

    To the nearest order of magnitude, how many times greater than the speed of sound is the speed of light? 104 106 1010 1012

    asked on April 10, 2011
  37. physics

    How will changing charge change the equipotential at a distance of 2 meters?

    asked on May 12, 2011
  38. pleaseeeee help - physics

    Four charges are placed at the four corners of a square of side 15 cm. The charges on the upper left and right corners are +3 μC and -6 μC respectively. The charges on the lower left and right corners are -2.4 μC and -9 μC respectively. The net

    asked on May 14, 2011
  39. calc

    A machine lengthens a metal cylinder by rolling it under pressure. The radius of the cylinder decreases at a constant rate of 0.05 inches per second while the volume stays constant at 128π cubic inches. At what rate is the length L changing when the

    asked on December 27, 2011
  40. physics -- projectile motion

    why does a projectile of 45 degrees have the greatest range?

    asked on March 7, 2011
  41. physics

    Three resistors, each of resistance 6 Ω, are connected in such a way that that they form the three sides of a triangle. What is the equivalent resistance between any two vertices of the triangle?

    asked on May 23, 2011
  42. physics

    Will the photoelectric effect change for different targets

    asked on May 2, 2011
  43. physics

    A metal emits photoelectrons when yellow light is made to fall on it. Which of the following is correct when the metal is irradiated by a violet light? Choose one answer. a. The speed of electrons would increase. b. The speed of electrons would decrease.

    asked on May 1, 2011
  44. HiSTORY ....helpppppp

    Which of the following strategies did the NAACP employ to secure civil rights for A. Urging African Americans to vote for Democrats in return for support of civil rights legislation in Congressfrican Americans in the 1920s? B. Efforts to gain entrance to

    asked on March 22, 2011
  45. physics

    Three resistors, each of resistance 6 Ω, are connected in such a way that that they form the three sides of a triangle. What is the equivalent resistance between any two vertices of the triangle?

    asked on May 23, 2011
  46. physics ---- really dnt get this at all

    Will the photoelectric effect change for different targets

    asked on May 2, 2011
  47. physics

    Which of the following statements is true about a mass, which is attached to a spring and moves with simple harmonic motion on a frictionless horizontal surface? Choose one answer. a. The kinetic energy of the mass is maximum at the end positions. b. The

    asked on April 30, 2011
  48. HiSTORY ....helpppppp

    what did it mean to be modern in the 1920's?

    asked on March 21, 2011
  49. Eminent Domain

    how does the third amendment affect eminent domain

    asked on March 1, 2011
  50. calc

    Find dy/dx given x^2+ y^2= 2xy. Im not sure how to find dy/dx

    asked on December 28, 2011
  51. Psychology

    How are glial cells connected to stem cells?

    asked on December 20, 2011
  52. physics

    Which of the following is correct when the intensity of the light source is increased? Choose one answer. a. The number of photons emitted by the light source in unit time increases. b. The total energy of the photons emitted per unit time decreases. c.

    asked on May 1, 2011
  53. physics

    A metallic surface emits photo electrons when green light falls on it. But the metal does not emit when yellow light falls on it. Which of the following is correct when red light falls on the metallic surface? Choose one answer. a. The number of

    asked on May 1, 2011
  54. physics ---- really dnt get this at all

    Marks: 3 If the velocity of the particle is reduced by a factor of two, by what factor does the de Broglie wavelength change? Choose one answer. a. 2 b. 4 c. 1/2 d.1/4

    asked on May 1, 2011
  55. physics

    Which of the following is true for the transition of electrons from a higher energy to a lower energy state? Choose one answer. a. The greater the energy difference between the levels, the more is the wavelength of the photons emitted. b. The greater the

    asked on May 1, 2011
  56. physics

    how does the doppler effect relate to destructive interference?

    asked on April 1, 2011
  57. HiSTORY ....helpppppp

    The Ku Klux Klan of the postwar period differed from its original Reconstruction-era incarnation in all of the following ways except: A. it had a broad base of support outside the South. B. it tried to influence politics. C. it achieved most of its goals.

    asked on March 22, 2011
  58. HiSTORY ....helpppppp

    One unintended consequence of the immigration restrictions passed in the 1920s was to: A. end legal immigration from east Asia. B. decrease the number of immigrants from southern and eastern Europe. C. increase the number and proportion of immigrants from

    asked on March 22, 2011
  59. physics

    expressions for the force experienced by the charge when it enters the magnetic field at an angle?

    asked on June 4, 2011
  60. physics

    Four charges are placed at the four corners of a square of side 15 cm. The charges on the upper left and right corners are +3 μC and -6 μC respectively. The charges on the lower left and right corners are -2.4 μC and -9 μC respectively. The net

    asked on May 14, 2011
  61. physics

    Which of the following summarizes Rutherford's model of the atom? Choose one answer. a. Electrons are embedded in a positive region of spherical dimension. b. Electrons revolve around the nucleus without emitting radiation. c. Electrons revolve around the

    asked on May 1, 2011
  62. physics

    Marks: 1 In which of the following cases is the wavelength of the emitted radiation greatest? Choose one answer. a. Electron jumps from third orbit to second orbit. b. Electron jumps from third orbit to first orbit. c. Electron jumps from fourth orbit to

    asked on May 1, 2011
  63. physics

    Which of the following is correct according to Rutherford's atom model? Choose one answer. a. Atomic spectra should be line spectra. b. Electrons do not radiate while revolving in an orbit. c. Atomic spectra should be continuous spectra. d. Electrons are

    asked on May 1, 2011
  64. physics

    A 5.00 cm tall candle is placed at a distance of 50.0 cm from a double convex lens having a focal length of 15.0 cm. What is the image distance? Choose one answer. a. -21.4 cm b. 21.4 cm c. 65 cm d. 35 cm

    asked on April 30, 2011
  65. physics ---- really dnt get this at all

    if friction is set to zero and on planet Earth. Now, if you attach a mass to the spring from its initial equilibrium position, it vibrates forever in simple harmonic motion. Why doesn't it come to rest after stretching by a distance 'd'; proportional to

    asked on April 10, 2011
  66. trig

    3sin(2x)-2cos(x)=0

    asked on April 10, 2011
  67. trig

    4cos(2x)+2cos(x)+3=0

    asked on April 9, 2011
  68. math

    if you the cosine of a angle can you determine the measure of the angle

    asked on March 30, 2011
  69. science

    Is it possible that waves can be turned into a sourse for energy and/or power ?

    asked on March 25, 2011
  70. HiSTORY ....helpppppp

    The most prominent advocate of "Negro nationalism" during the early twentieth century wwas A. Claude McKay B. Alice Paul C. Zora Neale Hurston D. W.E.B. Du Bois E. Marcus Garveyas

    asked on March 22, 2011
  71. physics

    What is the units for impact?

    asked on March 5, 2011
  72. calc

    An object moves along a parabolic path defined by the equation y = 2x 2 + 1 in such a way that the y-value is decreasing at a constant rate of 2 units per second. At what rate is the x-coordinate changing when x = 3/2?

    asked on December 27, 2011
  73. Psychology

    How are glial cells connected to nanotechnology?

    asked on December 20, 2011
  74. Psychology

    How does glial cells affect parkinson's disease? How does glial cells affect neurotransmitters ?

    asked on December 18, 2011
  75. physics

    How are electric potential and electric field strength related?

    asked on May 12, 2011
  76. physics

    How will changing the charge change the electric field strength at a distance?

    asked on May 12, 2011
  77. science

    is a wall a conductor or insulator ?

    asked on May 10, 2011
  78. physics

    Under what conditions can a balloon become charged and not charged?

    asked on May 9, 2011
  79. physics

    How will the current in a wire change as the wavelength of light changes? I have no idea how to do this.

    asked on May 2, 2011
  80. physics

    How will the current in a wire change as the wavelength of light changes? I have no idea how to do this.

    asked on May 2, 2011
  81. physics

    A point source of light produces photoelectrons from a photo cell with certain velocity. Which of the following is correct for the photoelectrons if the distance between the photo cell and the source of light is increased? Choose one answer. a. Velocity

    asked on May 1, 2011
  82. physics

    A point source of light produces photoelectrons from a photo cell with certain velocity. Which of the following is correct for the photoelectrons if the distance between the photo cell and the source of light is increased? Choose one answer. a. Velocity

    asked on May 1, 2011
  83. physics

    Which of the following is correct for the energy levels in an atomic system? Choose one answer. a. The energy value increases with the distance from the nucleus. b. The energy value decreases with the distance from the nucleus. c. The energy value remains

    asked on May 1, 2011
  84. physics

    Can the charges of a material be different on a different point of a material

    asked on May 24, 2011
  85. physics

    How will changing the distance change the electric field strength for a given charge?

    asked on May 12, 2011
  86. physics -- waves

    How does rarefraction affects the frequency of waves ?

    asked on April 1, 2011
  87. physics

    how does a cardboard boat float?

    asked on March 30, 2011
  88. HiSTORY ....helpppppp

    Temperance groups in the 1910s focused on: A. boycotts of saloons and companies that sold or transported alcohol. B. convincing individuals of the evils of alcohol. C. passing local laws outlawing the sale and production of liquor. D. fighting organized

    asked on March 21, 2011
  1. calc

    thanks that helps alot

    posted on December 27, 2011
  2. pleaseeeee help - physics

    is it towards the proton?

    posted on May 14, 2011
  3. physics

    so its 40?

    posted on May 14, 2011
  4. is a wall a conductor?

    Well it was a lab and the balloon was a insulator with a negative charge it was attracted to the wall so does that mean the wall is a insulator or conductor

    posted on May 10, 2011
  5. physics ---- really dnt get this at all

    thank u so much it makes sense

    posted on April 10, 2011
  6. HiSTORY ....helpppppp

    thanks. +)

    posted on March 22, 2011
  7. HiSTORY ....helpppppp

    ok. so then a

    posted on March 22, 2011
  8. HiSTORY ....helpppppp

    I THINK ITS C

    posted on March 22, 2011
  9. HiSTORY ....helpppppp

    e . MARCUS GARVEY

    posted on March 22, 2011
  10. HiSTORY ....helpppppp

    i think its C

    posted on March 22, 2011
  11. HiSTORY ....helpppppp

    i think B

    posted on March 21, 2011
  12. physics

    thank u

    posted on March 5, 2011