Physics!

74,730 results, page 57
  1. physics

    What is the volume of a metal which weighs 28g less in kerosene and the densty is 800 kgm3 than it does in air
  2. Physics

    what is the correct equation to use to find the velocity of the center of mass of a cylinder after it rolls down a hill
  3. 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?
  4. Physics

    If a bullet was fired straight up at a speed of 30 m/s, what would be the total time for it to return to its starting point?
  5. physics

    what is the momentum of a free falling object that has a mass of 85 lbs. and falls for 20 seconds before it hits
  6. Physics

    Four 50-\mu {\rm{C}} charges are brought from far apart onto a line where they're spaced at 2.0-{\rm cm} intervals. How much work does it take to assemble this charge distribution?
  7. physics

    show that the acceleration is 7.5 m/s² for a ball that starts from rest and rolls down a ramp and gains a speed of 30 m/s in 4s
  8. Physics

    If a bullet was fired straight up at a speed of 30 m/s, what would be the total time for it to return to its starting point?
  9. physics

    An equipotential surface that surrounds a point charge q has a potential of 516 V and an area of 1.01 m2. Determine q
  10. physics

    What magnitude point charge creates a 13000 N/C electric field at a distance of 0.220 m?
  11. physics

    How much charge passes through a cross-sectional area of a copper wire in 0.8 s if I = 3.5 A? 1 C -Work equation?
  12. physics

    Compute the electric field about a uniformly charged plane sheet using gauss law.
  13. Physics

    An experimenter finds that no photo-electrons are emitted from tungsten unless the wavelength of light is less than 270nm.
  14. Physics

    What coefficient of friction is required to stop a hockey puck sliding at 12.8 m/s initially over a distance of 66.5 m?
  15. physics

    A ball tossed upward reaches a maximum height of 3.0m. Show that its initial speed was 7.7m/s.
  16. physics

    if a car moving 180km/h reduces to 72km, what is the percentage change in kinetic energy?
  17. Physics

    "At what point between two masses of 20kg and 15kg located 1.0m apart, will the gravitational field strength equal zero?"
  18. physics

    if a todler is moving at 15m/s and covering a distance of 1900m. how much time does it take to cover this distnace?
  19. physics

    Calculate the work done if a force of 300N Is applied at 30° to the horinzontal and body moves 20m
  20. Physics

    torque to move a block of m=200kg for 10m at an angle of 25 degree with a speed of 20m/s.
  21. Physics

    What is the direction of the displacement of a person who walks 10 km at 37 degrees south of east, then 14 km due west?
  22. physics

    a particle starts moving from rest with uniform acceleration . it travels a distance y in the next 2 sec
  23. Physics 202

    Find the period of a satellite with a circular orbit 350 above Earth's surface.
  24. physics

    An argon atom has a mass of 6.64 x 10 kg has 5.5x108 joules of kinetic energy. At What velocity is it moving?
  25. Physics

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

    How fast (in ) must a centrifuge rotate if a particle 8.00 from the axis of rotation is to experience an acceleration of 117000 's?
  27. Physics

    When you swim across a river does the time it takes to get to the other side depend on the rate of flow of the water?
  28. physics

    At what rate is a 60.0-kg boy using energy when he sprints up a flight of stairs 10.0 m high in 8.00 s? A. 75.0 W B. 48.0 W C. 735 W D. 480 W E. 4.80 kW
  29. Physics (Waves)

    Determine the intensity of light passing through a polarizer-analyzer combination with an angle of 45° between them.
  30. physics

    How long does it take a plane, traveling at a speed of 170 m/s, to fly once around a circle whose radius is 2900 m?
  31. physics

    If acoin roll at 1.5m/s and later rolls at 4.5m/s with an acceleration of 2 meters per squared second how long will it take to come to a stop, how far will it travel?
  32. physics

    A cars starts from rest and after 20 seconds its velocity becomes 108 km-1 find the acceleration of the car
  33. Physics (Waves)

    Determine the angle between a polarizer-analyzer combination that allows 33% of the incident light to pass through.
  34. 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?
  35. Physics

    What is the formula to find magnetic field at the centre of the solenoid of hollow iron core??
  36. Physics

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

    How many Joules of thermal energy must be added to 5 kg of water at 20 C to bring it to the boiling point (at 100 C)?
  38. physics

    explain why microwaves are better carriers of signals for long range transmission of radio waves?
  39. physics

    a 60kg sprinter accelerates from rest at 2.5m/s east for 4s. what force is acting and what is his final speed?
  40. Physics

    Two objects are near a bar magnet. One is about 1 cm away, while the other is 6 cm away. Compare and contrast the magnetic force that affects each object. What do they want me to do?
  41. physics

    How much heat is required to convert 3kg of ice at -5 degees C into steam at 125 degrees C?
  42. Physics

    A downward force of 5.1 N is exerted on a -7.3 mcirco C charge. What is the magnitude of the electric field at this point?
  43. physics

    calculate the friction force of an object? if weight=19600,vi=30ms-1,vf=0ms-1 and S=100m.
  44. physics

    Find the total force necessary to give a rocket of mass 25,000 slugs an acceleration of 28.0 ft/s2.
  45. AP Physics

    What is the potential energy of an electron and proton in a hydrogen atom if the distance between them is 5.3*10^-11? ANSWER k=9*10^9 Q=1.6*10^-19 q=1.6*10^19 Ue=? Ue=KQq/r Ue=-4.4*10^-18 j
  46. physics

    if a race car's velocity increases from 4 m/s to 36 m/s over a 4 s time interval, its average acceleration would be 10 m/s 2 ? IS THIS TRUE ?
  47. physics

    What force is necessary to keep a 2.00x10^3 car moving up a 15.0 degree incline at a constant velocity? (Mu=.200)
  48. physics

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

    Find the pressure exerted by a waterbed with dimensions of 2 m x 2 m which is 30 cm thick. (hint: use density of water)
  50. physics

    find the altitude change of a 10000-kg fighter which clims and in so doing, loses 100 m/s of airspeed
  51. Physics

    The position of some object moving along the x-axis is observed to be x(t)=9cos(pi*t/3+pi/4) meters. Find the frequency.
  52. Physics

    An airplane is flying at an altitude of 2,000 m with a speed of 216 m/s. What is the pressure of air outside the plane?
  53. physics

    If your boat weighs 1600 N, how much water will it displace when it’s floating motionless at the surface of a lake?
  54. physics

    suppose you apply 3 newtons of force to slide a box 2 meters in 6 seconds, how much work did you do?
  55. Physics

    A car travels in a straight line for 5.4 h at a constant speed of 79 km/h . What is its acceleration? Answer in units of m/s2.
  56. physics

    Describe how the energy from a rotating flywheel can be transferred to moving parts of a child's toy.
  57. Physics

    the teacher said something about doing the correct sig figs..im not sure if it applies to this, im so confused! 10.2* 7.5 =76.5? 27.1/5.31 =5.103578154425612?? 2.712 + 10.8= 13.512?
  58. physics

    a ball of mass m is thrown vertically upwards with Vo= 10j m/s. Study nature of motion
  59. physics

    The position of a particle moving along the x axis is given by x = (21 + 22t − 6t^2)m, where t is in s. What is the average velocity during the time interval t = 1s to t = 3s?
  60. physics

    Show that the acceleration is 7.5 m/s2 for a ball that starts from rest and rolls down a ramp and gains a speed of 30 m/s in 4 s
  61. Physics

    What is the tension in the string in (Figure 1) ? The volume of plastic ball is 95 cm3 and the density is 840 kg/m3.
  62. Physics

    A car travells 20 km due north and then on a bearing of 90 degrees for 12km. Use a scale drawing.
  63. physics

    sketch a postion time graph for a student walking east with a constant velocity how would that look
  64. physics

    "If you have an inductor that has an inductive reactance of 125 ohms, on a 60Hz frequency, what would be the inductance in henry's?"
  65. physics

    A train is travelling 20metres per second, accelerates at 0,5 cubic metres per second for 30 seconds.How far will it travel in this time?
  66. physics

    if a todler is moving at 15m/s and covering a distance of 1900m. how much time does it take to cover this distnace?
  67. physics

    how long do waves of frequency 7 hz and wavelength 5cm take to travel across a pool breadth 3.5 metres
  68. physics

    A positive and a negative charge, each with a magnitude of 1.41 x 10^-5 C, are separated by a distance of 0.44 m. Find the force on each of the particles.
  69. Physics

    An airplane lands and starts down the runway at a southwest velocity of 41 m/s. What constant acceleration allows it to come to a stop in 1.3 km?
  70. Physics help please

    Calculate the allowed wavelengths for the emission of a photon initially in the n=3 state in a hydrogen atom
  71. physics

    A 8.2 kg object undergoes an acceleration of 2.5 m/s2. What is the magnitude of the resultant force acting on it? Answer in units of N
  72. physics

    Mechanical energy is the difference between the kinetic and potential energies of an object. true or false?
  73. Physics

    An object that starts from rest completes 7 revs in 3 seconds. What is angular accel. in rad/s2?
  74. physics

    what is the kinetic energy of a 3 kg 20 cm diameter bowling ball with a linear velocity of 4m/s? (rolling and spinning)
  75. physics

    A stone of mass m kg is held h metres above the floor 50s.The workdone in joules over this period is
  76. Physics

    how fast would you have to be traveling at in a spaceship in order to appear to age 20% slower than your classmate left behind on earth
  77. Physics

    If the Kitty Hawk Flyer has 12 HP how would you express this power in the SI system and report the numerical value in kilowatts?
  78. physics

    what is meant by the change go temperature of 1 degree celcius on the scale of a plantinum resistance thermometer
  79. Physics, Help!! URGENT!!!

    A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s. What is his wavelength at this speed if his mass is 84.5 kg?
  80. Physics

    a truck is traveling in a straight line goes 60km in 83minutes. what is its average speed in km per hour?
  81. physics

    A ball is thrown off a 30 m high cliff at 2 m/s, 50 degrees above the horizontal. How long does it take to hit the ground?
  82. Another physics question...

    Deduce the electric field strenght at a point midway between charges of 7.2*10^-6 C and -3.4*10^-6 C that are 2.0m apart from air. Thank you!
  83. physics

    What is the frequency of the EM wave emitted most strongly by a glowing element on a stove with temperature 1,500 K
  84. Physics

    How much work is required to bring a 1000 kg racing car traveling at a speed of 60 km/hr to rest?
  85. Physics

    Forces of 9.5 N and 5.12 N act at right angles on a reddish-green block of mass 3.19 kg. How much acceleration occurs?
  86. physics

    Two equal point charges of +3.00 * 10^ -6 C are placed 0.200 m apart. What are the magnitude and direction of the force each charge exerts on the other?
  87. Physics

    Describe the acceleration time graph of a car traveling forward and applying its brakes.
  88. math in physics

    find the force if f between charges of 100mc -50mc located 50cm a part?
  89. physics

    How will the weight of a 20kg object change if it was in a lift that accelerates downward at 4 meters per second squared?
  90. physics

    A body is executing s.h.m. of amplitude 1m .Its velocity while passing through the mean position is 10m/s.Find its frequency.
  91. physics

    A boy sledding down a hill accelerates at 1.20 m/s2. If he started from rest, in what distance would he reach a speed of 6.10 m/s?
  92. Physics

    find the altitude change of a 10,000 kg fighter which climbs and in doing so loses 100 m/s of airspeed
  93. Physics

    What coefficient of friction is required to stop a hockey puck sliding at 12.8 m/s initially over a distance of 66.5 m?
  94. Physics

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

    the speed of a train increases from 15 mi/h in a distance of 500 ft. calculate the average acceleration in ft/s squared
  96. Physics

    At its peak, a tornado is 60.0 m in diameter and carries 500 km/h winds. What is its angular velocity in revolutions per second?
  97. Physics

    a boy whose weight is 600 N runs up a flight of stairs 10 m high in 12 second .What is his average power?
  98. physics

    What is the magnification of a 4 cm tall object placed 40 cm from a concave mirror having a focal length of 10 cm? Choose one answer. a. 0.33 b. -0.33 c. 1.33 d. -1.33
  99. Physics

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

    You throw a ball upward from a window at a speed of 2.9 m/s. How fast will it be moving when it hits the sidewalk 2.2 m below?