Physics!

74,730 results, page 92
  1. Physics

    A plane flies at 800km/h in stationary air. The distance to be traveled is 3000km. What was the wind speed if the journey actually takes 4.0 hours?
  2. Physics

    A sled is initially given a shove up a frictionless 24.0° incline. It reaches a maximum vertical height 1.10 m higher than where it started. What was its initial speed?
  3. physics

    in ydse, two parallel slits are made 1mm apart and a screen is placed 1m away. what is the fringe seperation when blue green light of wavelength 500 nm is used?
  4. Physics

    An object is dropped from a platform 100 feet high. Ignoring wind resistance, what will its speed be when it reaches the ground? _____ ft/s Please help me!!!
  5. physics

    the 3 lb block A rests on a surface for which the coefficient of kinetic is Mk=.30 determine the distance the 8-lb cylinder B must descend so that A has a speed of Va = 5ft/s starting from rest.
  6. Physics

    A rocket moves upward, starting from rest with an acceleration of 35.0 m/s2 for 5.63 s. It runs out of fuel at the end of the 5.63 s but does not stop. How high does it rise above the ground?
  7. Physics

    Calculate the magnetic flux density in air at a point 15mm from a long straight wire carrying a current of 100A
  8. physics

    The Sun radiates about 4 × 1026 J of energy into space each second. How much mass is released as radiation each second? The speed of light is 3 × 108 m/s. Answer in units of kg
  9. Physics

    How does the cochlea sense sound? •Snail shaped tube lined with receptor cells which transmits signals to the brain. Correct?
  10. Physics

    A Martian rover is moving up a hill sloped at 30.0° with the horizontal. If it has a constant velocity of 1.50 meters/second, calculate its vertical displacement after 21.0 seconds.
  11. physics

    two particles perform linear simple harmonic motionalongthe same path of length 2A and period T as shown in the graph below. the phase differe3nce between them is -------------
  12. physics

    if you wished to warm 100 kg of water by 15 degrees celsius for your bath, how much heat would be required? (give your answer in calories and joules)
  13. Physics

    An arrow of mass 1000kg was fired from rest with a velocity of 15m/secs for a period of 0.5secs.calculate the applied force.
  14. Physics

    A rocket moves upward, starting from rest with an acceleration of 35.0 m/s2 for 5.63 s. It runs out of fuel at the end of the 5.63 s but does not stop. How high does it rise above the ground?
  15. Physics

    A rocket moves upward, starting from rest with an acceleration of 35.0 m/s2 for 5.63 s. It runs out of fuel at the end of the 5.63 s but does not stop. How high does it rise above the ground?
  16. physics

    A roller coaster car is moving at 20.0m/s along a straight horizontal track. what is the speed after climbing a 15.0m hill? neglect the effects of friction
  17. physics

    Two equals negatives charges (-1.75x10^(-19) Coulb) are separated by an insulator at a distance of 0.230 mm. Find the electrostatic force between these electrons?
  18. Physics

    An advertisment claims that a certain 1200 kg car can accelerate from rest to a speed of 25 m/s in 8.0 s. what average power must the motor supply in order to cause this acceleration?
  19. Physics

    A man pulls a 50 kg box with an acceleration of 2m/s^2 across the floor. He applies a 200 N force at an angle of 30 degrees what is the coefficient of the kinetic friction?
  20. Physics

    a hoop of radius .5 m & mass .2 kg is released from rest & rolls down an inclined plane. how fast is it moving when it has dropped a vertical distance of 3 m?
  21. Physics

    in a wire AB of uniform cross section in which a potential gradient of 0.1 V/m exist.If the balancing point is foung to be 180 cm from A then what is the Emf of the cell?
  22. physics

    Bob heads out into a lake at an angle of 34 with respect to the shore. If his boat is capable of a speed of 2.5 m/s, how far from land will he be in 7 min and 31 s ? Answer in units of m
  23. physics

    at what inclination should the object be released from rest if it is to reach a maximum horizontal distance of 2m as shown. coeff of friction is 0.37 for all surfaces of contact.
  24. physics

    A rocket moves upward, starting from rest with an acceleration of 32.0 m/s2 for 3.27 s. It runs out of fuel at the end of the 3.27 s but does not stop. How high does it rise above the ground?
  25. Physics

    A rocket moves upward, starting from rest with an acceleration of 35.0 m/s2 for 5.63 s. It runs out of fuel at the end of the 5.63 s but does not stop. How high does it rise above the ground?
  26. Physics

    William Tell fired an arrow with a velocity of 100 m/s at an angle of 30˚. How long will it take to reach its highest point? Please show work
  27. physics

    what is curie temperature?what is a fermi energy level?what is its position in case of an intrinsic semi conductor?what is a thermal neutron?what is its importance?
  28. physics

    a 10 kg mass is attached to one end of a string with a lenght of 5m and whirled in a horizontal circle overheadd at a rate of 1 revolution per second what is tension in the sring
  29. Physics

    1a. Two converging lenses, each of focal length 14.4 cm, are placed 60.6 cm apart, and an object is placed 26.9 cm in front of the first. Where is the final image relative to the second lens formed? b. What is the magnification of the system?
  30. physics

    an thelet completes one round of circular track of diameter 200m in 40 secomds. wht will be the distance covered t the end of 2min & 20 s.
  31. Physics

    An oscillator with a mass of 520 g and a period of1.2 s has an amplitude that decreases by 2.20% during each complete oscillation. At what time will the energy be reduced to 15.0% of its initial value?
  32. physics

    An engine provides a 10kw of power to lift a heavy load at a constant velocity a distance 20m in 5s. what is the mass of the object being lifted?
  33. PHYSICS

    Suppose a moose jumps straight up with an initial upward velocity of 95 m/s. How long until the ungulate lands back on the ground, where it belongs?
  34. physics

    If a loaded truck that can accelerate at 1 m/s2 loses its load and has four-fifths of its original mass, what acceleration can it attain if the same driving force acts on it?
  35. Physics

    A 0.55 kg block slides across a tabletop with initial velocity of 3 m/s and it comes to rest in a distance of 0.53 m. Find the average friction force that retarded its motion.
  36. Physics

    A novice skier, starting from rest, slides down a frictionless 24.0 incline whose vertical height is 215. How fast is she going when she reaches the bottom?
  37. physics

    how do u find the horizontal force needed to push a wheel that weighs 300N and has a radius of 30m.it also lies on the stairs of 10m
  38. physics

    Qualitatively explain how you would expect the potential energy to change as a glider slides down an inclined air track, where friction is negligible.
  39. physics

    Qualitatively explain how you would expect the kinetic energy to change as a glider slides down an inclined air track, where friction is negligible.
  40. physics

    a picture frame 25 kg hung over a nail by a string attatched to two hookes in the upper bar . find tension using parallelogram law
  41. Physics

    A 120-V rms voltage at 1000 Hz is applied to a resistor and an inductor in series. If the impedance of this circuit is 110 Ù, what is the maximum value of the current?
  42. physics

    If a burning log is a black object with a surface area of 0.35 m2 and a temperature of 800 ˚C, how much power does it emit as thermal radiation?
  43. physics

    How much force is the air exerting on the front surface of the book with dimensions 19 x 27 cm. Assume atmospheric pressure equal to 100,000 Pa.
  44. physics 2

    calculate the mass of air inside a 500 liter container at a pressure of 200 kpaa and temperature is 30 degree celsuis
  45. physics

    electricity is measured in kilowatts-hours, kW*h. this quantity can be converted to which other unit that measures energy? a.Pascals b.Joules c.Newtons d. Watts
  46. physics

    Suppose a moose jumps straight up with an initial upward velocity of 95 m/s. How long until the ungulate lands back on the ground, where it belongs?
  47. Physics

    A 200-Ù resistor, 40.0-mH inductor and a 2.00-ìF capacitor are connected in series with a 120-V rms source at 1000 Hz. What is the phase angle of this circuit?
  48. Physics!

    Suppose that you are standing on a train accelerating at 0.39g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?
  49. Physics

    A stone popelled from a catalpult with the speed of 50m/s attained a height of 100m. Calculate the time of flight and angle of projection.
  50. Physics

    A weightlifter raises a 90k-g barbell from the floor to a height of 2/2 m in 0.6 s. What was his average power output during his lift? Sorry I wrote it wrong the first time!
  51. physics

    how do we find the interpolation from a graph to determin the number of images which should be observer with a mirror angle of 90 degree and how do we calculate the line equation.
  52. physics

    activity to demonstrate the fact that for a metallic wire of uniform material density and thickness, the resistance increases directly with its length.
  53. PHYSICS

    What is the angular momentum of a 2.7 kg uniform cylindrical grinding wheel of radius 12 cm when rotating at 1600 rpm? How much torque is required to stop it in 4.4 s?
  54. Physics

    A pulley system has an efficiency of 78.0 per- cent. The acceleration of gravity is 9.81 m/s2 . How much of the rope must be pulled in if a force of 469 N is needed to lift a 52 kg desk 2.78 m?
  55. physics

    Frosty the Snowman was a jolly happy soul of mass 85 kg. If his initial temperature was -19C , how much heat did he absorb till he was at 25C ?
  56. Physics

    Rotating initially at 1800 rpm, a wheel with a diameter of 74.0 cm is brought to rest in 11.0 s. Calculate the magnitude of its angular acceleration in radians/second^2
  57. physics

    A toboggan of mass 8.4 is moving horizontally at 18 . As it passes under a tree, 18 of snow drop onto it. We're covering Momentum and collisions, and I have no idea where to start here.
  58. Physics

    Find the approximate gravitational red shift in 500 nm light emitted by a compact star whose mass is that of sun but whose radius is 10 km.
  59. Physics

    Find the approximate gravitational red shift in 500 nm light emitted by a compact star whose mass is that of sun but whose radius is 10 km.
  60. Physics

    Find the approximate gravitational red shift in 500 nm light emitted by a compact star whose mass is that of sun but whose radius is 10 km.
  61. physics

    An old-fashioned single-play vinyl record rotates on a turntable at 46.0 rpm. What are (a) the angular velocity in rad/s and (b) the period of the motion?
  62. physics

    at what altitude should a satellite be placed into circular orbit so that its orbital period is 48 hours? the mass of the earth is 5.976x10^24 kg and the radius of the eatrh is 6.378x10^6 m.
  63. physics

    Find the approximate gravitational red shift in 500 nm light emitted by a compact star whose mass is that of sun but whose radius is 10 km.
  64. Physics

    A monochromatic wavelength 600nm passed through a singlde slit which has a width of 0.8mm. A,calculate the distance between six and nineth bright frings.
  65. physics, math, science

    a soccer ball is kicked on the ground at 8m/s. another player is standing 30 m away. if she needs to intercept it at 20m - how much time does she have and how fast must she run?
  66. Physics

    A monoatomic gas expands isobarically.What will be the percentage of heat supplied that increases the thermal energy and that involved in doing work for expansion?
  67. physics

    top-fuel drag racers are able to uniformly accelerate at 12.9 m/s from rest 97 m/s before crossing the finish line . How much time elapses during the run ?
  68. physics

    An outfielder throws a 0.150-kg baseball at a speed of 50.0 m/s and an initial angle of 30.0°. What is the kinetic energy of the ball at the highest point of its motion?
  69. physics

    two perfect elastic balls of same mass m are moving with velocities u1 and u2 . they collide elastically n times. the kinetic energy of the system finally is?
  70. Science - Physics

    Some helium at 20.0psi gauge pressure occupies 40.0ft^3. find its volume at 32.4 psi if the temperature remains constant.
  71. physics

    Calculate the individual torques produced by the weights of the girl and boy on the see-saw in the figure above, given that Wgirl = 310 N and Wboy = 620 N and the length of the see-saw being 6m.
  72. physics

    A production line inspector wants a mirror that produces an image that is upright with a magnification of 7.1 when it is located 10.0 mm from a machine part. What is its radius of curvature?
  73. Physics

    Calculate the force exerted on a rocket, given that the propelling gases are expelled at a rate of 1800 kg/s with a speed of 3.8×104 m/s (at the moment of takeoff).
  74. physics

    A toboggan of mass 8.4 is moving horizontally at 18 . As it passes under a tree, 18 of snow drop onto it. We're covering Momentum and collisions, and I have no idea where to start here.
  75. Physics

    Suppose that you are standing on a train accelerating at 0.33g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?
  76. physics

    the sound from a mosquito is produced when its wings vibrates at an average rate of 500 vibrations/sec.What is the tine period of the vibration?
  77. physics

    A typical color television draws about 2.8 A when connected to a 145 V source. What is the effective resistance of the T.V. set? Answer in units of Ω.
  78. physics

    a converging lens has a focal length of 15cm. Find two positions where a real object can produce images four times its size.
  79. physics

    a converging lens has a focal length of 15cm. Find two positions where a real object can produce images four times its size.
  80. physics

    a car accelerates uniformly from rest to a speed of 21.8 km/h in 5.9 seconds.find the distance it travels during this time. answer in units of meters
  81. College Physics

    Two 72.0-kg hockey players skating at 7.00 m/s collide and stick together. If the angle between their initial directions was 130 degrees , what is their speed after the collision?
  82. physics

    A typical jogger burns up food energy at the rate of about 43 kJ per minute. How long would it take to run off a piece of cake if it contains 435 Calories?
  83. general physics

    What is the smallest number of whole logs (ñ = 725 kg/m3, radius = 0.0556 m, length = 3.80 m) that can be used to build a raft that will carry four people, each of whom has a mass of 73.0 kg?
  84. physics

    A sphere is fired downwards into a medium with an initial speed of 40 . Part A If it experiences a deceleration of , where is in seconds, determine the distance traveled before it stops.
  85. physics

    Driving home from school one day, you spot a ball rolling out into the street (see the figure ). You brake for 1.40 , slowing your 950- car from 16.0 to 9.50 .
  86. physics

    A body of mass 2 kg is dropped from the top of a tower of height 100m. If the acceleration due to gravity is 10 m/s2 calculate the K.E at the end of 5 seconds
  87. physics

    A rocket moves upward, starting from rest with an acceleration of 28.8 m/s2 for 4.13 s. It runs out of fuel at the end of the 4.13 s but does not stop. How high does it rise above the ground?
  88. Physics

    A bullet is fired straight up from a gun with a muzzle velocity of 148 m/s. Neglecting air resistance, what will be its displacement after 6.3 s? The acceleration of gravity is 9.8 m/s2 .
  89. Physics to Elena

    Ex=0 ; Ez=0 Ey = 10   sin(3.14x - 6.08e8 t) what is the time-averaged Poynting vector (magnitude and direction) for the position x=y=z=−3 ?
  90. physics

    for starting from rest and moving in a straight line,runner achieves a velocity of 7m/s in a time of 2 seconds .what is the average acceleration of the runer.
  91. Physics

    You drive your car 2 km to the gas station, 4 km to the shopping mall to let your mother off, and 4.5 km back home. The trip takes 20 min. What is your velocity in m/s?
  92. physics

    A merry go round has a radius of 3.5 meters. How far does a child standing at the edge travel (path length) if the wheel is rotated 13.0 radians?
  93. physics

    a body is dropped from the roof of a builindgs 10 m high .calculate the time of fall and the speed with which it hits the ground .take g=10m/second sqare
  94. physics

    a body is dropped from the roof of a builindgs 10 m high .calculate the time of fall and the speed with which it hits the ground .take g=10m/second sqare
  95. physics

    What is the magnitude of the apparent weight of a 79 astronaut 5200 from the center of the Earth's Moon in a space vehicle moving at constant velocity?
  96. physics

    With an average acceleration of −1.6 m/s^2, how long will it take a cyclist to bring a bicycle with an initial speed of 13.3 m/s to a complete stop? Answer in units of s
  97. Physics

    The fastest helicopter, the Westland Lynx, has a mass of 3.343 x 103 kg and a maximum momentum of 3.723 x 105 kg.m/s. What is its top speed?
  98. Physics

    You throw a baseball straight up at 40 m/s and it reaches its peak after 4.00 seconds. What is its speed when it falls back into your hand? What is its displacement? What distance has it traveled?
  99. physics

    What net force would actually be necessary to stop an automobile of mass 880 traveling initially at a speed of 52.0 in a distance equal to the diameter of a dime, which is 1.8 ?
  100. physics (fluids)

    If a object of radius 3 cm is attached to the ground in a 3 m deep sea, what is the vertical force in N with which the water (density = 1000 kg/m^3) presses on it?