Physics!

74,459 results, page 44

  1. physics

    Pls what is the specific of water? Is think is 4200 but my mates are saying it's 4180
  2. Physics(Please respond)

    1) A roller coaster (398 kg) moves from A (3.82 m above the ground) to B (29.4 m above the ground). Two non-conservative forces are present: friction does -1.82 x 104 J of work on the car, and a chain mechanism does +5.49 x 10^4 J of work to help the car up a long climb. What ...
  3. Physics check

    A speeder traveling at 41 m/s passes a motorcycle policeman at rest at the side of the road. The policeman accelerates at 3.3 m/s2. To the nearest tenth of a second how long does it take the policeman to catch the speeder? Im sorry I am new to physics this is my first year and...
  4. Physics/Math

    A can of sardines is made to move along an x axis from x1 = 0.2 m to x2 = 1.2 m by a force given by F = iF0exp(-0.4x), with x in meters and F0 = 4.5 N. (Here exp is the exponential function.) How much work is done on the can by the force? For Further Reading * Physics/Math - ...
  5. physics

    gravational force deimos, a satellite of amrs, has an average radius of 6.3 km. If the gravational force between deimos and a 3.0 kg rock at its surface is 2.5x10(-2)N..what is the mass of deimos ? Use the Universal Law of gravitation: Force= G Mm/distance^2 Solve for M. i did...
  6. physics please help

    In a physics laboratory experiment, a coil with 170 turns enclosing an area of 10cm^2 is rotated from a position where its plane is perpendicular to the earth's magnetic field to one where its plane is parallel to the field. The rotation takes 5.0×10^2 s . The earth's ...
  7. Physics. Please help!!

    Distruive interference? Unless you put C in the line between A and B, this the asnwer is at infinity. Now on the line between A and B, the distance from A to C has to be an odd multiple of halfwavelength greater than C to B. Now, the distance between the speakers is two ...
  8. PHYSICS

    Long, long ago, on a planet far, far away, a physics experiment was carried out. First, a 0.250 kg ball with zero net charge was dropped from rest at a height of 1.00 m. The ball landed 0.350 s later. Next, the ball was given a net charge of 7.60 muC and dropped in the same ...
  9. Physics(Please help)

    A person is riding a bicycle, and its wheels have an angular velocity of 26.0 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop. During braking, the angular displacement of each wheel is 17.6 revolutions. (a) How much time does it take for the bike ...
  10. PHYSICS

    Could u help with physics hw! i keep trying but i keep getting the wrong answer? a 71g autographed baseball slides off of a 1.3 m high table and strikes the floor a horizontal distance of .83m away from the table. 1.how fast was it rolling on the table before it fell off? ok ...
  11. physics

    Hi, I am confused about physics, more specifically force. I know that the formula for force is: f=ma So what if an object traveling at constant speed (acc equals zero) collides with a wall? How would you calculate the force, since there is no acceleration? There IS force upon ...
  12. senior courses

    this is a reply to Ms.Sue's question yesterday. my college and career goals are to do with Foods. cooking, culinary arts .. but i don't think that i can chose my next year (12th grade) courses according to that, can i? those are my plans for college right now i'm having ...
  13. Physics

    An airliner is at point A and is trying to fly to point B, which is 1000 km due North of point A. The pilot of the airliner wishes to reach point B in 2.5 hr. A wind is blowing from the Northwest (45 degrees) at 100 km/hr. In what direction and at what speed must the pilot fly...
  14. physics

    Answer the following question:Be sure to show all work. Include formulae and units.Be sure to include relavant, meaningful diagram and a complete circuit diagram with circuit related problem. take enough space, don't try to squeeze everything on a small space!(problems are ...
  15. AP Physics

    Using what's only in chapter one The Nature of Science Models, Theories, and Laws Measurement and Uncertainty; Significant Figuers Units, Standards, and SI System Converting Units Order of Magnitude: Rapid Estimating Dimensions and Dimensional Analysis How am I suppose to ...
  16. active physics

    a 25 mewton force pushes against a 5 kg. mass. what is the acceleration??? what formula do i use?? F=ma
  17. Physics II

    How much work (in joules) is done in moving a charge of 2.5μC a distance of 35 cm along an equipotential at 12~V?
  18. physics

    does the voltage output increase when a generator is made to spin faster? Defend your answer
  19. physics

    If a car travels westward with a constant velocity of 20 m/s, what is the net external force acting on it?
  20. Physics

    2.A 4430 kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?
  21. Physics

    2.A 4430 kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?
  22. AP PHYSICS >>>please help

    HOW WOULD YOU integrate this equation between zero and pi/2 1/(1+(tan^2008)xdx
  23. Physics

    How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?
  24. Physics

    How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?
  25. Physics

    What is the number of the highest harmonic that could be heard by a person who is capable of hearing frequencies up to 1.00×104 Hz?
  26. Physics

    i cant get this right. what is the measured resistance of a 1000ohm, 500ohm and a 100 ohm resistor. and there % error
  27. Physics

    A 4610 kg helicopter accelerated upwards at 2 m/s^2. What lift force is exerted by the air on the propellers?
  28. Physics

    Displacement is to distance as velocity is to: a. acceleration b. mass. c. speed. d. time I chose C....is this correct?
  29. Science-- Physics

    Does an object need to have a velocity of 0 meters per second to be in equilibrium and why/why not?
  30. Physics

    How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.8 µC?
  31. Physics

    How do the mainsail and the jib of a sailboat help the boat sail? What do these two sails have to do with force?
  32. Physics

    Aircraft with acceration of magnitude of 42.5 m/s. If starting from rest how long will it take to travel a 2.6 km runway?
  33. Physics

    Why are the armature and field windings of an electric motor usually wound on an iron core?
  34. Physics

    Does the voltage output increase when a generator is made to spin faster? Defend your answer.
  35. physics

    does a ball moving at a constant speed around a circular track produce acceleration?
  36. physics

    In a red glass filter, of the colors that make up white light, which if any are reflected or absorbed?
  37. Physics

    what is the purpose of the double bell jars that surround the international prototype of the kilogram in Paris?
  38. Physics

    If you are viewing a hologram and you close one eye, will you still perceive depth? Explain.
  39. physics

    lenses that always diverge light rays that strike them is that convex or concave? I am not sure.
  40. Physics

    Explain how the photoelectric effect is used to open automatic dooes when someone approaches.
  41. physics

    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
  42. Physics check

    In 1923, Robert Millikan won the Nobel Prize for discovering the mass of the .... electron?
  43. Physics check

    The two quantities conserved in all nuclear equations are....... mass and number?
  44. Physics

    If the third harmonic of a standing wave in a vibrating string is 600 Hz, what is the fundamental frequency?
  45. physics

    Does an object need a net force acing on it in order to move at constant velocity?
  46. Physics

    A student photographs a 18cm flower so it fills half of a 24mm slide. What is the magnification?
  47. Physics

    Two identical charges are 36 mm apart. The electrostatic force between them is 1.3 N. What is the size of each charge?
  48. college physics

    the speed of light is about 3.00 x 10^8 m/s. convert this figure to miles per hour
  49. 11th grade physics

    im not procrastinating i really don't understand it. im not asking for the answers im just asking for a little more help??
  50. physics

    can anyone give me a site that "best explains" about Rotational motion/Angular. thanks a lot.. :)
  51. Physics

    can anyone give a site that have problems about pressure with solution.. urgently needed.. thanks :)
  52. physics

    What is the evidence for the claim that iron exists in a relatively cool outer layer of the sun?
  53. physics (emergency!)

    How much work is required to stop an electron (m = 9.11 10-31 kg) which is moving with a speed of 1.99 106 m/s?
  54. Physics- 8th Grade

    What force is needed to accelerate a 10 kilogram shopping cart 3 m/s^2 (squared)?
  55. PHYSICS

    lIST THE PARTICLES THAT MAKE UP AN ATOM. wHAT ARE THEIR CHARGES? hOW ARE THEY ARANGED? wHAT IS THE APPROXIMATE AMU OF EACH PARTICLE?
  56. Physics

    List the particles that make up an atom. What are their charges? How are they arranged? wHat is the approximate amu of each particle?
  57. physics

    An object experiences an impulse, moves and attains a momentum of 200 kg m/s. If its mass is 50 kg, what is its velocity?
  58. physics

    Why can't you put your heels firmly against a wall and then bend over without falling?
  59. Physics

    What are some possible uses for gelled methanol and why was it never used as a fuel in transportation?
  60. Physics

    If 2.4 m3 of a gas initially at STP is compressed to 1.6 m3 and its temperature raised to 30oC, what is the final pressure?
  61. physics

    If an 80kg sprinter can accelerate from a standing start to a speed of 10 m/s in 3 s, what average power is generated?
  62. Physics

    What is the work required for a 1000kg truck to increase in speed from 30 m/s to 40m/s? Is the answer 350 kJ?
  63. Physics

    What Net Force is necessary to give a 2.0 kg mass initially at rest an acceleration of 5.0 m/s^2? Is the answer 10. N?
  64. physics

    how much work can a 50.0kg wreckin ball traveling at 5.00m/s do when striking a building
  65. Physics

    How does mass affect the motion of objects falling freely under the influence of gravity?
  66. Physics

    How can you easily increase the magnetic field strength inside a current carrying coil?
  67. Physics

    What is the de Brogile wavelength of an electon that strikes the back of the face of a TV screen at 1/10 the speed of light?
  68. Physics

    A cube of ice weighing 18 grams sublimes into vapor. How many liters of gas will you get?
  69. Physics

    What does shifting the phase between the sources in a double slit experiment do to the interference pattern?
  70. Physics

    An object is thrown upwards with a speed of 14.0 m/s. How long does it take to reach its maximum height
  71. Physics

    Could someone tell me the formula for finding distance when time is given and the acceleration is constant?
  72. Physics

    What is the value of a if the object is moving with constant velocity? What does this equation reduce to in such a case?
  73. physics

    The acceleration of a certain rocket is given by a=bt where b is positive cnstant, find the position function Xo and Vo at t=o?
  74. Physics

    The acceleration of a certain rocket is given by ax=bt where b is positive constant, find the position and velocity at t=5.0s if Xo=0 and Vo=0 and b=3.0m/s^3?
  75. physics

    Is it possible to calculate the torque acting on a rigid body without specifying the origin?
  76. physics

    A 1100 kg sports car accelerates from 0m/s to 33m/s in 13s What is the average power of the engine?
  77. physics

    A 4430-kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?
  78. Physics

    Runners in the 100-m dash use starting blocks. Explain what this device does. PLEASE HELP.
  79. physics

    A 1.5 volt battery will increase the potential energy of ________________ coulombs of charge by 0.18 joules.
  80. physics

    What happens when you walk across a carpet and receive a shock when you touch a metal object.
  81. physics

    A particle at rest undergoes an acceleration of 2.1 m/s2 to the right and 5 m/s2 up. a) What is its speed after 7.9 s? Answer in units of m/s.
  82. physics

    If a car is traveling westward with a constant velocity of 20 m/s, what is the net external force acting on it?
  83. Physics

    If the change in position Dx is related to velocity v (with units of m/s) in the equation Dx = Av, the constant A has which dimension? a. m/s^2 b. m c. s d. m^2 I chose b?
  84. physics

    How can you easily increase the magnetic field strength inside a current-carrying coil?
  85. Physics

    How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?
  86. physcal science/physics

    what is the kinetic energy in joules of a 1000 kg car travelling at 90km/h
  87. Physics

    What is the de Broglie wavelength of an electron that strikes the back of the face of a TV screen at 1/9 the speed of light?
  88. Physics

    Thanx DRWLS! Worked like a charm and I checked behind myself with the same formula!!!
  89. Physics

    Another one, sorry! =P This stuff is really confusing.. Why doesn't friction depend on surface area?
  90. physics

    how many electrons must be removed from an electrically neutral silver dollar to give a charge of +2.8 uc
  91. Physics

    At what temperature is the rms speed of helium molecules half its value at STP (0 C}, 1.0 atm)?
  92. physics

    if a block of wood dropped from a building has attained a velocity of 78 m/s how long has it been falling?
  93. Physics

    what is the mass of hydrogen peroixide, H2O2, in 350 grams ofa 20% by weight solution?
  94. Physics

    A mass of gas has a volume of 380 cm3 at a pressure of 560 mm Hg and a temperature of 7C. What is its bolume at s.t.p.?
  95. physics

    how much energy is gain by an electron accelerated through a potential differenc of 30000v?
  96. grade 11 physics

    what is the index of refraction of a medium in which the speed of this radiation is 2.54X10^8 m/s? I don't even know where to start...
  97. physics

    Determine the percent error in this approximate value. (There are 365.24 days in one year.)
  98. physics

    What is the number of the highest harmonic that could be heard by a person who is capable of hearing frequencies up to 1.00×104 ?
  99. Physics

    What experiment can be used to prove that the value of gravity near the earths surface is constant ie. 9,8m.s
  100. physics

    A crane lifts 1 tonne of concrete through a height of 25 m. How much work does it do? (1 kg has a weight of 9.81 N.)
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