physics please HELP !

74,755 results, page 59
  1. Physics

    A car travels in a straight line for 4.8 h at a constant speed of 63 km/h . What is its acceleration? Answer in units of m/s 2
  2. physics

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

    How long will it take a 1920 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
  4. physics

    At 7.15 cents per kilowatt-hour, what does it cost to leave a 75.0W light burning 24.0 hours a day?
  5. Physics Please

    You want to show that V^2 - Vo^2 = 2 a (X - Xo) first rewrite that as: (V-Vo)(V+Vo) = 2a (X-Xo) now your average velocity during the interval = (V+Vo)/2 so X = Xo + t(V+Vo)/2 but V = Vo + a t so t = (V-Vo)/a so X = Xo +(V-Vo)(V+Vo)/2a we are there.
  6. Physics

    Inside a metal conductor, why is it not possible to have a static charge configuration if there is a net electric field?
  7. Physics

    To what potential a sphere of radius 10cm be charged so that the surface density of charge is equal to 1
  8. physics

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

    what is the central acceleration of an automobile driving at 40 kph on a circular tracks having radius of 30m?
  10. Physics

    A 150 kg body is at rest and covers the constant force needed to impart a velocity of 8m/s to it in 5s.
  11. physics

    A mass of 1kg is placed at 1m,2m,0.Another mere of 2kg is placed at 3m,4m,0.Find moment of inertia of both the ladder about z-axis
  12. 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?
  13. physics

    a body is moving with uniform acceleration of 10m/s2.if it starts from rest calculate its displacement after 5s
  14. Physics

    What equations should I use to calculate the effective value of g, the acceleration of gravity (in meters/second^2), at 5800 km above the earth's surface?
  15. physics

    what is meant by liquefaction of gases? can hydrogen be liquefied by compression at the temperature of liquid air?
  16. Physics

    What is the strength of the magnetic field a distance of 1 meter from a wire carrying a current of 1 A? B=MoI ------ 2(pi)r Mo=4(pi)x 10^-7 I=1 A How do I know what r is?
  17. 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?
  18. physics

    A boy sledding down a hill accelerates at 1.30 m/s2. If he started from rest, in what distance would he reach a speed of 8.00 m/s?
  19. Physics

    I am curious how the earth work as an omnipresent conductive surface in an electrical distribution system?
  20. Physics

    From the position vs time graph of an object moving with constant acceleration, how could you find the velocity
  21. Physics

    How much potential energy is required to lift a 50 gram arrow to a height of 100 meters?
  22. Physics

    A 3.0 cmm high object is placed 10 cm from a concave mirror whose radius of curvature is 10 cm. Where is the image located?
  23. PREAP Physics

    From what height would a compact car have to be dropped to have the same kinetic energy that it has when being driven at 100 km/hr?
  24. physics

    Why does the pitch of the sound produce by blowing over an open end of a bottle change when you have more water in it?
  25. Physics

    a canon fires shell at 300m/s. at what angle must it aim to hit a target 5.0km away?
  26. Physics

    A golf ball struck with an initial speed of 41.8m/s. What is the range of the shot if the launch angle is 30.0º?
  27. Physics

    Two charges q1= -25 C and q3= 4.0 C are placed 0.012 m apart. A third negative charge, q2 is placed a distance L from q1 as shown. If the net electric force on q2 is 0N what is the value of L?
  28. Physics

    Calculate the velocity of a 6kg riffle that shoots a 0.025kg bullet at a speed of 615m/s.
  29. physics

    A 60 kg stunt person runs off a cliff at 5.3 m/s and lands safely in the river 11.8 m below. What was the splashdown speed?
  30. Physics

    A bowling bowl has a mass of 25 KG. What is the acceleration of the ball if an upward force of 110 N is applied?
  31. physics

    what is the heat required to convert 0.1 kg of melting ice into steam at 100 degree celcius
  32. physics

    A family drives 400 milles in 8 hours. Explain how the acceleration of their car changed?
  33. AP Physics

    What minimum speed does a 130 g puck need to make it to the top of a 3.8 m -long, 23 ∘ frictionless ramp?
  34. physics

    an elevator weighing400kg is to be lifted up at a constant velocity of 3cms-1 what would be the minimum power of motor to be used
  35. physics

    A 15 kg box slides across the floor with an initial velocity of +7.6 m/s. It comes to a stop after sliding +14.8 m. How much friction was present?
  36. physics

    if the shortest lenght of the tube for resonance is 0.1m and next resonanc length is 0.35m what is the frequency of the vibration.
  37. physics

    What is the free-fall acceleration in a location where the period of a 2.87 m long pendulum is 3.4 s? Answer in units of m/s 2
  38. physics

    What is the radius of an automobile tire that makes a complete turn in 0.1 sec and has a linear speed of 24.0 m/s?
  39. Science - Physics

    how much power is in my bicep if i can lift 50kg a height of 50cm 40 times in one minute?
  40. Physics

    What is the frequency of an EM wave emitted most strongly by a glowing element on a stove with temperature 1500 K?
  41. PHYSICS

    two forces of magnitude 8N making an angle of 30 and 120 with xaxis . the y component of resultant A/ O B/ 4N C/ 8N D/ 16N
  42. Physics

    If a force of 15.0 N directed east acts on a stationary 5.00 kg mass, what are its acceleration, displacement, and velocity after 10.0 s?
  43. physics

    two forces of magnitude 8N making an angle of 30 and 120 with +xaxis . FInd the y component of reultant
  44. Physics

    If a force of 15.0 N directed east acts on a stationary 5.00 kg mass, what are its acceleration, displacement, and velocity after 10.0 s?
  45. physics

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

    Calculate the time elapsed if the speed of a truck going south is reduced from 80 km/h to 44 km/h in a distance of 250 m.
  47. physics

    A cara accelerates uniformly from rest to a speed of 21.9 km/h in 8.5 s. Find the distance it travels during this time.
  48. 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?
  49. Physics

    What is the final velocity of a hoop that rolls without slipping down a 5.00-m-high hill, starting from rest?
  50. 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?
  51. physics-non calc

    a hammer was released from rest vi=0m/s taking 1.12 seconds to fall 1 meter. How do you solve that
  52. physics

    a rolling ball covers a distance of 650m in 20 min. its speed in kilometer per hour will be what?
  53. Physics

    What is the centripetal acceleration of a skater moving with a tangential speed of 2.0 m/s in a circular path with radius 2.0 m?
  54. Physics

    A 1200 kg sports car accelerates from 0m/s to 27m/s in 10s. What is the average power of the engine?
  55. 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?
  56. 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?
  57. physics

    vector b has x,y, and z components of 4.0, 6.0, and 3.0 units, respectively. Calculate the magnitude of b and the angles that b makes with the coordinate axes.
  58. physics

    George takes off for a long jump at an angle of 28 degrees, and lands 6.9 m away. How fast was he when he jumped?
  59. 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
  60. 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?
  61. physics

    4. What force is needed to push a 15 N object up a 20° incline at constant speed when the coefficient of friction is 0.30?
  62. physics

    4. What force is needed to push a 15 N object up a 20° incline at constant speed when the coefficient of friction is 0.30
  63. Intro to Physics

    With scanning probe microscopy technology, we see not actual atoms but rather images of them. Explain.
  64. physics

    A commuter backs her car out of her garage with an acceleration of 1.6 m/s2. How long does it take her to reach a speed of 2.3 m/s in seconds
  65. Physics

    A stone is thrown vertically upward with a speed of 19.0m/s How fast is it moving when it reaches a height of 10.0m
  66. physics

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

    An airplane from rest accelerates on a runway at 5.50 m/s² for 20:25 seconds until it finally takes off the ground. What is the acceleration before the take off?
  68. Physics

    Two violin players tuning their instruments together hear 8 beats in 2 s. What is the frequency difference between the two violins
  69. physics

    if 20g of steam at 100 c is mixed into 80 g of water at 20 c what is the final temperature if no heat lost
  70. Physics

    If a car engine has a power,P. Write an expression for the time it will take to accelerate from w to 4w. Note that P=wt where t is torque.
  71. physics

    a car of mass(m)800kg initially at rest is accelerated at rate of 4m/s calculate the k.e @ 5seconds
  72. PHYSICS

    TWO WEIGHTS ARE ATTACHED TO BOTH ENDS OF A WIRE AND SLIDED ON A BLOCK OF ICE.INVESTIGATE THIS PHENOMENON?
  73. Physics

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

    Consider a pair of planets for which the distance between them decreases by a factor of 5. Demonstrate that the force between them becomes 25 times greater
  75. Physics

    A 1300 sports car accelerates from rest to 90 in 6.5 . What is the average power delivered by the engine?
  76. Physics

    What is the partial pressure of water on a day when the temperature is 25C and the relative humidity is 33% P=___Pa
  77. Physics - Magnetism

    The direction of magnetic lines of force change if an iron piece is placed in its field. Why?
  78. physics

    How many times a minute does a boat bob up and down on ocean waves that have a wavelength of 43.0 m and a propagation speed of 5.25 m/s?
  79. physics-magnetism

    The direction of magnetic lines of force change if an iron piece is placed in its field. Why?
  80. physics

    What is the quantum particle of the electric field? Answer a. The proton. b. The electron. c. The photon. d. The neutron.
  81. PHYSICS

    A point source of a wave emits 195 watts. What is the intensity at a distance of 4.56 meters? I =
  82. physics

    a bus decreases its speed from 80kmh-1to 60kmh-1 in 5 sec find the acceleration
  83. Physics

    What effort is exerted to lift a load of 150N with a machine having a velocity ratio of 3 and efficiency of 20%
  84. physics

    x-rays produced in an x ray machine can have a frequency of 1.4*10^14 what is the wave length of these electromagnetic waves in nm?
  85. physics

    a body is moving with uniform acceleration of 10m/s2.if it starts from rest calculate its displacement after 5s
  86. physics

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

    how high a building can superman jump over if he is to leave the ground with a velocity of 60 m/s at an angle of 75 degrees
  88. PHYSICS

    AN OBJECT MASS OF 10KG IS PLACED ON AN INCLINED PLANE AT 30 degree at the horizontal calculate recreation between two su
  89. AP Physics B

    What is the force of Friction as a 12 kg object slides down for 30 meters down a 30 degrees incline at a constant velocity?
  90. physics

    Find the voltage increase when 12 J of work is done to push a 0.0013 C charge into an electric field.
  91. physics

    Why does a conductor carrying current experiences force when held in a magnetic field at right angles to it?
  92. physics

    A women walks 2m in the direction 60degrees north of east. find her final displacement.
  93. physics

    A women walks 2m in the direction 60degrees north of east. find her final displacement.
  94. physics

    How much centripetal force is needed to keep a 0.20 kg ball on a 1.50 m string moving in a circular path with a speed of 3.0 m/s?
  95. physics

    an airplane taking off from a landing field has a run of 500m. Calculate the average acceleration in ft/s2.
  96. physics

    Write the equation for fill factor in terms of V_max, V_oc, J_max, and J_sc. FF =
  97. physics

    How much centripetal force is needed to keep a 0.20 kg ball on a 1.50 m string moving in a circular path with a speed of 3.0 m/s?
  98. Physics

    What is the maximum total force exerted on a 78 kg astronaut by her seat during the launch of the Space Shuttle?
  99. PHYSICS

    a 3000 N car is moving at 12.0m/s comes to a stop while skidding a distance of 25.0m. what is the coefficient of kinetic friction?
  100. Physics

    all electric field lines start on positive charges. explain why this makes sense.