Physics!

74,459 results, page 92

  1. physics

    What average force is required to stop an 1900 car in 6.0 if the car is traveling at 80 ?
  2. physics

    A sound wave has a frequency of 707 Hz in air and a wavelength of 0.50 m. What is the temperature of the air?
  3. physics

    An inflated basketball has a gauge pressure of 9.0 lb/in^2. What is the actual pressure inside the ball?
  4. Physics

    A car experiences an average acceleration of 5.00 km/hr/s for 3.50 sec. What is the change in velocity of the car?
  5. physics

    A force of 1260 N is needed to accelerate a motorcycle at 4 m/s2. What is the mass f the motorcycle and its rider?
  6. physics

    A system is provided 50 J of heat and work done on the system is 10 J. What is the change in internal energy
  7. Physics

    Why do roller coasters use clothoid loops instead of circular loops?
  8. Physics

    A 110 V, 60 Hz AC line is connected to a 6.55 mH coil. Find the current through the coil.
  9. Physics

    a car travels at 20km/h for 1.5h, at 30km/h for 2.0h, and at 40kmh for 0.75 h. What is the car average velocity
  10. PHYSICS

    Evaluate the following intergal:- çMvdv , with upper limit 'v' and lower limit 'u'
  11. Physics

    A centrifuge spins a suspension at 2500 rpm in a radius of 20 cm. What is the acceleration of the suspension?
  12. Physics

    A 2.0 kg mass swinging at the end of a 0.5 m string is travelling 3.0 m/s. What is the centripetal force on the mass?
  13. Physics - Converting

    Convert each of the following measurements to its equivalent in metres. A. 1.1cm B. 76.2 pm I don't get how to convert :\
  14. Physics

    A Styrofoam ball of radius 60 cm falls with a terminal velocity of 8.65 m/s. What is the mass of the ball?
  15. physics

    The successive dis- placements are 5.7 m to the north, 6.3 m 45  north of east, and 9.3 m 50 west of south.
  16. physics

    It takes 5.50 J of work to stretch a spring 5.90 cm from its unstressed length. What is the spring constant k in N/m?
  17. physics

    It takes 9.10 J of work to stretch a spring 5.10 cm from its unstressed length. What is the spring constant k in N/m?
  18. physics

    The speed of sound in air at 20 degrees C is 343m/s. This corresponds to a speed of ____mi/hr.
  19. physics

    What happens to the size of a hole in a metal plate when the plate is heated / cooled
  20. physics

    What happens to the size of a hole in a metal plate when the plate is heated / cooled
  21. PHYSICS PLEASE HELP !!!!!

    If a mass lies on an incline, what is the reaction force to the weight of the mass?
  22. Physics

    A boy has a mass of 45 kg and is running with a velocity of 8 m/s. Find the boy's kinetic energy.
  23. physics

    Brad tosses a rock straight up at 38.4 m/s. What is the rock's velocity after 2.0 seconds?
  24. physics

    An object is located 87.6 cm from a concave mirror that has a focal length of 17.0 cm. Where is the image located?
  25. Physics

    the coefficient of friction between a 78 kg box and a warehouse floor is .21. what is the friction force?
  26. Physics

    What is the fundamental frequency for a 62 cm banjo string if the speed of waves on the string is 470 m/s?
  27. physics

    a force of 20 n is applied to a 10 kg mass on a level frictionless surface what is the acceleration of the mass?
  28. Physics

    Suppose A=3i-2j+k, B=-i-4j+3k&C is a vector lying along x-axis with the property that A.(B+C)=0. Then find vector C.
  29. Physics

    A rocket expels gases at a rate of 1.30 x 10^3 kg/s with a speed of 3.00 x 10^4 m/s. What is the force exerted on the rocket?
  30. physics

    A constant friction force of 15 N acts on a 70 kg skier for 20 s. What is the skier's change in velocity?
  31. physics

    Which of these two is faster-a plane traveling at 250km/hr and a cat running at 250km/hr
  32. physics

    a comet experiences a uniforn acceleration from 60m/s to 183m/s what is the rate of acceleration?
  33. physics

    Mr.FIsher can kick a 2 kg football upwards at 20m/s, how high does the football travel?
  34. physics

    A capacitor that is connected to a 70.0 V source contains 105.0 µC of charge. What is the capacitor's capacitance?
  35. Physics

    How much energy is need to raise 50 kg of warm water from 45 celcius to 80 celcius?
  36. Physics

    Charges of -10.8 nC and -24.2 nC are separated by 0.813 m. What is the potential midway between the two charges?
  37. Physics

    A parallel plate capacitor has a capacitance of 1.71 nF. There is a charge of 0.809 μC on each plate.
  38. Physics

    What is the acceleration of an 0.4m aluminum cube with a density of 2.72 in a beaker of methanol, which has a density of .791?
  39. physics

    e relative to the ground. The airplane’s speed relative to the air is 77.9 km/h. Answer in units of km/h
  40. physics

    The car has a mass of 1200kg Calculate the kinetic of the car when it travels at a speed of 12 m/s.
  41. Physics

    A 0.168kg hockey puck slides at 11.4m/s. what is the work needed to stop the puck?
  42. Physics - grade 11

    The speed of light of a plastic is 1.4x10^8. What is the index of refraction in the plastic?
  43. physics

    You walk 50 m to the north, then turn 60° to your right and walk another 45 m. How far are you from where you originally started?
  44. physics

    You walk 50 m to the north, then turn 60° to your right and walk another 45 m. How far are you from where you originally started?
  45. PHYSICS HELP!!!!!!!

    You walk 50 m to the north, then turn 60° to your right and walk another 45 m. How far are you from where you originally started?
  46. physics

    Suppose the water waves have a velocity of 1.2m/s and wavelength of 2.4m What is the frequency of the waves?
  47. physics

    An electromagnetic wave in a vacuum has a magnetic field with a magnitude of 1.7 x 10^-6 T. What is the intensity S of the wave?
  48. physics

    If you shout across a canyon and hear the echo 0.42 s later, how wide is the canyon?
  49. Physics

    If the two input voltages to a 2-input summing amplifier are +2 V and +5 V, what is the output voltage?
  50. Physics

    If the critical frequency of a low-pass filter is 5 kHz, what is the filter bandwidth?
  51. Physics

    If you can see the face of a friend who is underwater, can she also see you? Please explain. Thanks :)
  52. physics

    If the critical angle of a liquid is 41.4 degrees find the index of refraction for that liquid
  53. physics

    if a person is pushing a cart with a force of 40 Newtons and it accelerates at 0.5 m/s2 , what is the mass of the cart ?
  54. physics

    When an electron jumps from the 4th orbit to the 2nd orbit which series line does it get?
  55. Physics

    A car is initially traveling at 20 m/s when it accelerates to 35 m/s in a time of 5 seconds. What is the acceleration of the car in m/s^2?
  56. Physics

    What is the fundamental frequency for a 58 cm banjo string if the speed of waves on the string is 450 m/s?
  57. Physics

    A spring vibrates at 8Hz,when a mass of 0.82kg is hung from it.What is the spring constant?
  58. physics

    What is the fundamental frequency for a 60 cm banjo string if the speed of waves on the string is 480 m/s?
  59. Physics

    At a certain distance from the center of the Earth, a 4.00-kg object has a weight of 1.95 N. Calculate this distance.
  60. physics 1

    a car is being pulled out of the mud by two two ropes
  61. PHYSICS

    SILICON DENSITY 1.05G/CM3 1MTR x 1MTR x4MM HEIGHT
  62. physics

    How much work can a 22 kW car engine do in 60 seconds if It is 30% efficient It is 100% efficient
  63. physics

    An 21.0 , 12.0 , and 5.0 resistor are connected in series with an emf source. The current in the 12.0 resistor is measured to be 4.00 A.
  64. physics

    A plane traveling at 260m/s has a speed of Match 0.80. What is the speed of sound in the air
  65. physics

    Give an example of an object that moves in a direction opposite the direction of its acceleration
  66. Physics

    Give an example of an object that moves with constant acceleration and constant speed.
  67. physics

    A lead ball has a volume of 94.3 cm3 at 19.3°C. What is the change in volume when its temperature changes to 34.3°C?
  68. Physics

    A lead ball has a volume of 94.3 cm3 at 19.3°C. What is the change in volume when its temperature changes to 34.3°C?
  69. Physics Diploma Q?

    a photon drops from -22 eV to a ground state of -89.2 eV. the frequency the photon emits is? [1.62]
  70. Physics

    which do you prefer to use, an instrument which is more precise or one which is more accurate? WHY? thanks po! :)
  71. physics

    Find the tension T2 of the box hanging from the rope if 1 = 25°, 2 = 65°, T1 = 60.58 newtons, and W = 143.4 newtons
  72. Physics

    vertically up at 28m/sec, gravity 9.8 meters/sec^2 = what is max. height
  73. Physics

    Add (9.3x10^3) + (9.3x10^4) + (0.011x10^6) using correct significant figures?
  74. Physics

    An arrow is shot horizontally from a cliff at 15 m/s land 30 m away. How high is the cliff?
  75. Physics

    An arrow is shot horizontally from a cliff at 15 m/s land 30 m away. How high is the cliff?
  76. physics

    If an 8N force is applied to a wall for 2 minutes and the wall does not move, how much work is done?
  77. physics

    list the contact and non contact forces in mathematics. What is the cold welding?
  78. physics

    from equation t equal to root x+3 find velocity and acceleration t equal to 1second
  79. physics

    from equation t equal to root x+3 find velocity and acceleration t equal to 1second
  80. physics

    Why should we add a the value 273 to change a celcius value in to kelvin.?
  81. physics

    A ball is dropped from a height of 18.6 m. What is the velocity of the ball the instant it hits the ground?
  82. physics

    How do I find the acceleration on a velocity time graph when the graph has an irregular shape.
  83. physics

    A football is kicked 66.6 meters. If the ball is in the air 5.39 s, with what initial velocity was it kicked?
  84. Physics

    How many calories will take to convert 5 grams of 90C degree water to 0 C degree?
  85. physics

    If Joe weighs 100N on the moon how much will Joe weigh on earth? N & kg
  86. physics

    What is the magnitude of displacement for a person that walks 6.0-km North-East, 4.0-km East, and 6.0-km South?
  87. physics

    What is the magnitude of displacement for a person that walks 6.0-km North-East, 4.0-km East, and 6.0-km South?
  88. physics

    A soccer ball kicked with a force of 14.8 N accelerates at 6 m/s2 to the right. What is the mass of the ball?
  89. physics

    an object accelerates at 0.8m/s2 when a resultant force of 200n is acting on it what is the mass of the object
  90. physics

    what is acceleration of an object over a 4second period if its starting velocity is 8 m/s and it velocity is 20 m/s?
  91. Physics

    a spring with a spring constant k= 1340 N/m is oriented find the rate of compression
  92. physics

    The pendulum on a cuckoo clock is 5.00 cm long. (a) Determine the period of this pendulum. (b) What is its frequency?
  93. Physics

    What is the equivalent resistance of two resistors of 2 ohm and 3 ohm connected in parallel?
  94. physics

    find the magnitude of vector by scalar and vector A= ? + 4j +4k B= ? + 2j + 3k if the angle between them 15 degrees.
  95. physics

    The index of refraction of a certain type of glass is 1.58 what is the speed of light in the glass ?
  96. physics

    It takes 2.5 J of energy to stretch a helical spring by 15 cm. Determine the spring constant.
  97. physics

    Haloke does 179 J of work lifting himself 0.296 m. What is Haloke's mass?
  98. physics

    A car is moving at 37 m/s. It slams on its brakes and comes to a stop in 22 m. What was the acceleration from the brakes?
  99. Physics

    An arrow was shot vertically upward at a velocity of 50.0 m/s. What was its velocity after 2.00 seconds?
  100. Physics

    What force is needed to give a 0.25-kg arrow an acceleration of 196 m/s2? A. 0.25 N B. 49 N C. 196 N D. 748 N
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