Posts by ashley --- HELP PLEASEE!!!

Total # Posts: 100

  1. calc

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

    thanks that helps alot
  4. 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 radius r is 1.8 inches...
  5. Psychology

    How are glial cells connected to nanotechnology?
  6. Psychology

    How are glial cells connected to stem cells?
  7. Psychology

    How does glial cells affect parkinson's disease? How does glial cells affect neurotransmitters ?
  8. 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 Weber d. 1.6 Weber the ...
  9. 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 the twin that was ...
  10. 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...
  11. physics

    expressions for the force experienced by the charge when it enters the magnetic field at an angle?
  12. 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
  13. 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 moving charge ...
  14. 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 right. b. The current in ...
  15. 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. 1.3 Tesla
  16. 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. a. 0.6 N b. 1.0 N ...
  17. 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 1021 electrons
  18. 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
  19. 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)
  20. 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?
  21. physics

    Can the charges of a material be different on a different point of a material
  22. 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?
  23. 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?
  24. 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?
  25. 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??
  26. 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
  27. pleaseeeee help - physics

    is it towards the proton?
  28. 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 electric ...
  29. 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 electric ...
  30. 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 the proton c. 5.1 ...
  31. physics

    so its 40?
  32. 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
  33. physics

    How are electric potential and electric field strength related?
  34. physics

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

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

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

    A hollow metal ball carrying an electric charge produces no electric field at a point: is it inside the ball?
  38. 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 electric...
  39. 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
  40. 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?
  41. 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
  42. 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
  43. is a wall a conductor?

    is a wall a conductor?
  44. science

    is a wall a conductor or insulator ?
  45. physics

    Under what conditions can a balloon become charged and not charged?
  46. 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?
  47. 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.]
  48. 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
  49. physics

    What total mass must be converted into energy to produce a gamma photon with an energy of 1.03 × 10^–13 joule
  50. 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?
  51. physics

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

    Will the photoelectric effect change for different targets
  53. physics ---- really dnt get this at all

    Will the photoelectric effect change for different targets
  54. physics

    How will the current in a wire change as the wavelength of light changes? I have no idea how to do this.
  55. 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 will increase. b. ...
  56. 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 nucleus like ...
  57. 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. Photons are emitted ...
  58. 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 photoelectrons will be more. b...
  59. 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 first orbit. d. ...
  60. 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
  61. 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 ball moving with? ...
  62. 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 period of the pendulum ...
  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 embedded in a ...
  64. 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. c. The number of ...
  65. 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 energy difference ...
  66. 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 will increase. b. ...
  67. 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 the same for all the ...
  68. 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
  69. 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 kinetic energy of the ...
  70. 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.
  71. 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
  72. 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) remain the same
  73. physics ---- really dnt get this at all

    thank u so much it makes sense
  74. 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 the weight ...
  75. trig

    3sin(2x)-2cos(x)=0
  76. trig

    4cos(2x)+2cos(x)+3=0
  77. physics -- waves

    How does rarefraction affects the frequency of waves ?
  78. physics

    how does the doppler effect relate to destructive interference?
  79. physics

    how does a cardboard boat float?
  80. math

    if you the cosine of a angle can you determine the measure of the angle
  81. science

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

    thanks. +)
  83. HiSTORY ....helpppppp

    ok. so then a
  84. 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. D. it was strongly ...
  85. HiSTORY ....helpppppp

    I THINK ITS C
  86. 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 Mexico and Latin ...
  87. HiSTORY ....helpppppp

    e . MARCUS GARVEY
  88. 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
  89. HiSTORY ....helpppppp

    i think its C
  90. 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 labor unions for ...
  91. HiSTORY ....helpppppp

    i think B
  92. 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 crime's control of ...
  93. HiSTORY ....helpppppp

    what did it mean to be modern in the 1920's?
  94. HiSTORY ....helpppppp

    why is yellow journalism important in the Spanish American war?
  95. physics -- projectile motion

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

    thank u
  97. physics

    What is the units for impact?
  98. 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 Pacific easier. D. It ...
  99. Eminent Domain

    how does the third amendment affect eminent domain
  100. 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 force ...