214,364 results, page 57

  1. Academic 4-year plan: Zoology

    I want to work in the field of zoology when I get older, and I'm filling out an "academic 4-year plan" our counselors gave to my class to complete and turn in on Monday. The science and math I'm taking this year are physics and geometry. Can you take Calculus (a high school ...

    VERY IMPORTANT FOR A PHYSICS PRESENTATION.. PLEASE HELP & EXPLAIN CLEARLY??? THANKS SO MUCH! (a) why is the centripetal force neede to keep a body moving in a circular path? (b) In what direction does a centripetal force accelerate the body on whic it acts?? (c) Upon what ...
  3. physics

    A large crate filled with physics laboratory equipment must be moved up an incline onto a truck. 1. The crate is at rest on the incline. What can you say about the force of friction acting on the crate? 2.A physicist attempts to push the crate up the incline. The physicist ...
  4. Physics

    Explain what happens to the charge carriers in a semiconductor light dependant resistor when it is illuminated. Suggest why shining light onto an LED might be expected to generate a small voltage between its terminals. Thx A semiconducting light-dependent resistor excites more...
  5. Physics

    I had this question last night for Dr. Bob-A fox sees a piece of carrion thrown from a nest 14 m high and goes to get it. Carrion is thrown 1.5 horizontal velocity. Fox is 7. m from base of tree. What is mgnitude of fox's average velocity if it grabscarrion just as it touches ...
  6. Social studies?

    Please ignore my previous post. I prematurely hit the enter key. I've been watching this board all day, waiting for someone to answer my physics question (no one has yet. sigh.) I just have to say Ms. Sue is my hero. She consistently answers almost every student's questions, ...

    "Relative" is an important word. Block L of mass mL = 1.90 kg and block R of mass mR = 0.500 kg are held in place with a compressed spring between them. When the blocks are released, the spring sends them sliding across a frictionless floor. (The spring has negligible mass and...
  8. physics

    Assistance required as to why visible light is not emitted when infrared radiation falls on fluorescent materials.
  9. Physics

    A ball rolls off the edge of a balcony at 8.0 m/s. Find its speed after 3.8 s in the air. Use g = 10. m/s2
  10. physics

    Which Law of Motion explains the action-reaction pair of forces. The first, second or third?
  11. Physics

    Calculate the Magnitude of the resultant of a pair of 100-km/h velocity vectors that are at right angles to each other.
  12. physics

    Find the the force the person must exert on the 14.5 kg lawn mower to accelerate it from rest to 1.5m/s in 2.5 seconds?
  13. physics

    a car traveling at 7.0 m/s accelerates uniformly at 2.5 m/s TO REACH A SPEED OF 12.0 M/S HOW LONG DOES IT TAKE FOR THIS ACCELERATION TO OCCUR?
  14. Physics

    Can anyone help? the resistance of the side lights on an automobile are 10 ohms. How much current flows in them when connected to 12 volts
  15. Physics

    How can you easily increase the magnetic field strength inside a current-carrying coil? Could someone help?
  16. physics

    true or false: according to einstein, a gravitational field is equivalent to an accelerating frame of reference.
  17. physics

    a dragster starting from rest accer;ates at 49m/s how fast is it going when it has raveled 325m?
  18. physics

    object kicked at 45 degree and travels 82 m b4 hitting the ground. what was its vo? how long was it in the air? how high did it go? please and thanks
  19. physics

    2.A plank is tilted slowly to an angle of 30 degrees with a 12 pound block on it Find FN, FF and the static friction?
  20. physics

    A 2.8 kg air mattress is 2 m long, .5 m wide, & .1 m thick. What mass can it support in water before sinking?
  21. Physics

    On a dt graph if there is a curve from 1 decreasing to 1.2 in an interval does is the velocity and acceleration + or 9? And is it slowing down or speeding up or neither?
  22. Physics

    An object moves with acceleration given by a = -6t^3 m/s^2. Its initial velocity at t = 0 is 5 m/s. How far will it move before stopping?
  23. Physics

    An object moves with acceleration given by a = -6t^3 m/s^2. Its initial velocity at t = 0 is 5 m/s. How far will it move before stopping?
  24. physics.

    Describe constructive and destructive interference in terms of the combining of crests and troughs and the reesulting amplitude.
  25. Physics

    8. Fire engines used to be red. Yellow-green is now the preferred color. Why the change?
  26. Physics

    How could you use the spotlights at a play to make the yellow clothes of the performers suddenly change to black?
  27. Physics

    Suppose you walk toward a mmirror at 2 m/s. How fact do you and your image approach each other? Explain your reasoning.
  28. Physics

    Your friend says that the wavelength of light waves is less in water than in air. Do you agree or disagree, and why?
  29. Physics

    What are the restrictions on the orbit of a communications satellite if it is to appear motionless in the sky as viewed from any location on earth?
  30. Physics

    Is getting shot considered to be an elastic or inelastic collision if blood shoots out everywhere?
  31. physics

    A 1.00-kg ball is attached to a string of 0.50 m and swung in a horizontal circle with a velocity of 2.00 m/s. Find the centripetal acceleration. ac=v^2/r = 2.00^2/.50 = 8.0 m/s^2
  32. physics repost

    Calculate the force of gravatational attraction between two spheres of mass 10.1 kg and 45.4 kg that are 38.5 m apart. F = G(m1)(m2)/r^2 = 6.67 x 10^-11(10.1)(45.4)/38.5^2 = 2.06 x 10 ^-11 N
  33. physics 2

    If you see a flash of lightnng and it is 3 sec. before you hear the clap, how far away is the storm?
  34. Physics

    Does the de Broglie model assert that an electron must be moving in order to have wave properties?
  35. physics

    the making of polymers is an example of the category of work done by chemists caledd _______ fill in the answeerrr
  36. applied physics

    if a DC motor uses a775 coulombs of charge in 15 seconds,how much current is produced
  37. physics

    a 0.03 mol sample of helium is taken through a cycle. the temperature of state A is 400K. calculate V.
  38. physics

    An electron and a proton that are placed in an electrical field both accelerate equally. True or False?
  39. Physics

    You throw a ball downward from a window at a speed of 1.8 m/s. How fast will it be moving when it hits the sidewalk 2.8 m below?
  40. Physics

    How do you find the moment of inertia of an actual bicycle about an axis through the pedal crank?
  41. Physics

    What is the gravitational force vetween 2 15-kg packages that are 35cm apart? What fraction is this of the weight of one package?
  42. Physics

    How much potential energy does Tim, with mass 60.0 kg, gain when he climbs a gymnasium rope a distance of 3.5m?
  43. physics

    Three balls A, B, and C, with masses of 3 kg, 1 kg, and 1 kg, respectively, are connected by massless rods. What are the coordinates of the center of mass?
  44. Physics

    If you had to straighten out a refracted ray that went through a lens with a focal length of +15 cm, what could you do?
  45. astronomy/physics

    determine the mass of the earth from the known period (365.25 days) and the distance of the moon (3.84X10^3 km)
  46. physics

    A force of 291.0 N is used to push a 140 kg mass 30.0 m horizontally in 3.00 s. Calculate the power developed in kW.
  47. Physics

    A yo-yo has a string length of 0.200 m What is the slowest speed at which you can spin it to keep it in a fixed path? What is this, and how do you find it? Thanks
  48. physics

    determine the velocity and kinetic energy of neutrons having de broglie wave length 1 angstrom
  49. physics

    List four effects that can be observed that demonstrate light travels in straight lines. Does anybody know the answer??

    How is it possible to have an instrument like a bugle that has a fixed-air column play a melody?
  51. college physics

    an automobile traveling at 25.0 km/h along straight,level road accelerates to 65.0 km/h in 6.00s what is the acceleration
  52. Physics

    Which force acts opposite of the direction of displacement of the object? I think it would be friction...but could it be spring?
  53. physics

    What is the longest wavelength of light that will emit electrons from a metal whose work function is 3.10eV?
  54. physics

    using ideas of torque and center of gravity explain why a ball rolls down a hill
  55. Physics

    What are some of the safety considerations and technologies used in designing a safe roller coaster ride?
  56. physics

    What initial mass of 235U is required to operate a 650-MW reactor for 1 year? Assume 40% efficiency.
  57. Physics

    Who was Isaac Newton? Write a brief paragraph about his life and work (include a bibliography)
  58. Physics

    If a tern travels 3.20 x 10^4 km south in 122 days, what is its average velocity in kilometers per day?
  59. Physics

    If a tern travels 3.20 x 10^4 km south in 122 days, what is its average velocity in kilometers per day?
  60. Physics

    How do you know when to use cos or sin or tan when they give you angles in the question to find tension or force?
  61. physics

    Who does more work if your friends pushes a something four times further than you with half the force?
  62. Physics

    A 5 N force directed to the west acts on an object for 2.0 seconds. What is the change in momentum of the oject? Would it be 5 X 2?
  63. physics

    Rubidium forms the postive Rb+ Is this ion larger or smaller then the neutral atom? Explain PLEASE
  64. physics

    How do the acceleration vectors differ on opposite sides of the path for un iform circular motion? How are they the same?
  65. physics

    How much time will elapse between seeing lightening and hearing the thunder happening 8000 m from you?
  66. physics

    How much time will elapse between seeing lightening and hearing the thunder happening 8000 m from you?
  67. physics

    An airplane travels at 144 km/h toward the northeast. What is the northern component of its ve- locity? Answer in units of km/h.
  68. physics

    A _____________ volt battery will increase the potential energy of 0.005 coulombs of charge by 29.5 joules.
  69. physics

    A light bulb with resistance of _____________ Omega draws 900 mA from a 110 V household circuit.
  70. Physics

    a projectile is launched with an initial velocity of 60 m/s at an angle of 30 degrees above the horizontal. how far does it travel?
  71. physics

    calculate the force of a 300,00 kg jumbo jet that is accelerating 0.4m/square just before takeoff

    Two long, parallel wires separated by 90 each carry currents of 2.0 in a horizontal direction.
  73. physics

    If wind blows at 44 m/s over a house, what is the net force on the roof if its area is 180 m^2 and is flat?
  74. physics

    A spring has k = 88 N/m. Use a graph to determine the work needed to stretch it from x = 3.6 cm to x = 5.6 cm, where x is the displacement from its unstretched length.
  75. physics

    an ant walk 1 meter west and then 3 meters north whats is the ants direction in degrees
  76. physics

    an ant walk 1 meter west and then 3 meters north whats is the ants direction in degrees
  77. physics

    An object falls a distance h from rest. If it travels 0.43h in the last 1.00 s, find (a) the time and (b) the height of its fall.
  78. physics

    estimate the rotational kinetic energy of earth, assuming it to be a solid sphere of uniform density
  79. physics

    Calculate the force of gravity on a spacecraft 12800 km above the earth's surface if its mass is 700 kg.
  80. physics

    The vertical leap of a professional NBA athlete is reported to be 47.3 inches. What is his takeoff speed? in m/s? is this kinematics??
  81. physics

    A bike travels at a constant speed of 4.0 m/s for 5.0 s. How far does it go? GIVEN: V = 4.0 m/s t = 5.0 s Would you use this equation? D= Vit + 1/2 at^2
  82. Physics

    How far does a plane fly in 15 s while its velocity is changing from 145 m/s to 75 m/s at a uniform rate of acceleration?
  83. Physics

    What potential energy does a 60.0-kg gymnast acquire in climbing 5.00 m up a vertical pole? GIVEN: mg = 60 h/d = 5.00 m PE = mgh PE = (60)(5.00) PE = 300 J
  84. physics

    What vector represents the displacement of a person who walks 15 km at 45 degrees south of east, then 30 km due west?
  85. physics

    Correct the following statement: The racing car rounds the turn at a constant velocity of 145 km/hr.
  86. Physics

    As one exhales, what change in energy takes place between the diaphragm and the air in the lungs?
  87. college physics

    A delivery truck travels 10 km north, 18 km east, and 29 km south. What is its final displacement (in km) from the origin?
  88. College Physics

    To move 5.0 C of charge from one electrode to the other, a 12-V battery must do how much work? 60 J 5.0 C 12 J 12 V 60 W
  89. physics

    for some reason, choice 6 was incorrect when i tried it sorry to keep bothering you about it drwls
  90. physics

    how to calcula distance of a object in free fall if only the time it reaches the ground is given
  91. physics

    1) At what speed must a 75 kg basketball player leave the ground if he is to jump a vertical distance of 1.2 m? (ans: 4.8 m/s)
  92. physics

    How much work must be done to bring three electrons from a great distance apart to 5.5×10−10 m
  93. Physics

    A 1.15 kg block slides down a 19.0 m long 29.0° incline at constant velocity. How much work is done by friction?
  94. physics

    need help decomposing theses vectors to x and y 52.9 meters at 19 degrees rectangular cor-ordinate system
  95. physics

    two charged objects carry a negative charge of 2*10c. calculate their distance apart
  96. Physics

    If two resistors are connected in parallel, I know that they share the same voltage but how would you determine their current?
  97. Physics

    On a bright sunny day, the irradiance on the surface of the ocean is 1.6*10^17 photons cm^-2 s^-1. If k=0.02 m^-1 a)How much light is left at 15 m? b)at 75 m?
  98. physics

    Find the voltage increase when 12 J of work is done to push a 0.0013 C charge into an electric field.
  99. 11th grade Physics

    What happens when a conductor is wired in parallel with the bulb? Is the swich open or closed?
  100. 11th grade Physics

    What happens when an insulator is wired in parallel with the bulb? is the swich open or closed?
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