physics please HELP !

74,851 results, page 79
  1. physics

    Charge polarization is normally produced by ____________________. A) nuclear interactions.B) contact.C) induction.D) friction.E) electrostatic means.
  2. Physics

    A typical lightning flash delivers about 27C of negative charge from cloud to ground. How many electrons are involved?
  3. Physics

    Two ants race across a table 58cm long. One travels at 4.8 cm/s and the other at 3 cm/s. When the first one crosses the finish line, how far behind is the second one? Answer in units of cm
  4. Physics

    A bullet fired target loses half of it velocity in penetrating 15cm .how much further it will penetrate before coming to rest
  5. Physics

    are water waves at the beach with a velocity of 1.75m/s and a wavelength of 3.213 and frequency of 1/1.84Hz considered fast?
  6. physics

    What force should the woman in Figure 9.45 exert on the floor with each hand to do a push-up? Assume that she moves up at a constant speed.
  7. physics

    a box of treasure with a mass of 92 kg and volume of 0.031metrecubic lies at the bottom of the much force is needed to lift it?
  8. Maths, physics, chemistry,

    The weight of H2C2O4.2H2O required to prepare 500 ml of 0.2N solution is a)126g b)12.6g c)63g d)6.3g
  9. Physics

    Show that 480 W of power is expended by a weightlifter when lifting a 60-kg barbell a vertical distance of 1.2 m in a time interval of 1.5 s.
  10. physics

    If two stones projected from the same point with the same speed but at angles pi/3 and pi/6 respectively have their ranges R₁ and R₂ then a)R1=2R2 B)R1=R2 C)R1=5R2 D)R1=25R2
  11. Physics

    If you look at yourself in a shiny Christmas tree ball with a diameter of 10.5 cm when your face is 35.0 cm away from it, (a) where is your image? (b) Is it real or virtual? (c) Is it upright or inverted?
  12. physics

    A loaded truck can accelerate at 3.2 m/s^2 It loses its load so that it is only 0.2 as massive. By what factor must the acceleration change for the same driving force?
  13. physics

    Any ideas? A bird flying at 3m/'s west is given an acceleration of 1ms after five seconds what I'd it's velocity and how far has it travelled from its starting point?
  14. Physics

    An olympic hurdler is in a race. He is running at 10 m/s and jumps over a hurdle. How high did he jump if he was moving at 1m/s as he crossed the fence?
  15. physics

    three point charges are located at the corners of a right triangle where q1=q3= 5uC,Q2= -2uC and r =10cm.(angle q1 q2q3=90 and q1q3=r)
  16. physics

    If a trapeze artist rotates once each second while sailing through the air and contracts to reduce her rotational inertia to one-third of what it was, how many rotations per second will result?
  17. Physics

    Sky divers falls out of a plane at an altitude of 11750 m. How much time in seconds will they pass before they deploy their parachutes?
  18. Physics Project

    I was wondering what would be some advantages of having a spherical shaped object travelling through air and/or water, as opposed to other shapes?
  19. Physics

    Two tuning forks are struck at the same time; one with a pitch of 410Hz one a frequency of 500Hz. How many pitches do you hear and what are the frequencies?
  20. Physics

    What is the magnitude of buoyant force acting on a 720 cm^3 toy submarine floating in fresh water? (D_water =1 g/cm^3)
  21. physics

    An aeroplane lands on the runway at velocity 180km/hour and decelerates at 0.4 m/s^2 find the time taken until it stops and the displacement.
  22. Physics

    Your swimming pool is square and 4.9 m on a side. It is 3.9 m deep in the morning. If the temperature changes by 44°C during the afternoon, how much does the depth of the water increase?
  23. Physics projectile

    If a body projected vertically upwards, give a graph showing variation in its kinetic energy
  24. Physics

    A body travels from rest with acceleration 8m/s(squared)Find its velocity when it has covered a distance of 100 meter?
  25. physics

    three point charges are located at the corners of a right triangle where q1=q3= 5uC,Q2= -2uC and r =10cm.(angle q1 q2q3=90 and q1q3=r)
  26. Physics

    Standing on a bridge, you throw a 3.0 g stone straight upward with speed of 2.5 m/s. How long does it take to return to the original position?
  27. physics

    Given x(t) = xm cos 2ðt/T for a spring with constant k and attached mass m sketch as a function of t, (a) the displacement x, (b) the velocity v, (c) the acceleration.
  28. physics

    During an Olympic bobsled run, the Jamaican team makes a turn of radius 7.6 m at a speed of 96.6 km/h. What is their acceleration in terms of g?
  29. physics

    How far should and object be from a concave sperical mirror of radius 36cm to form a real image one-ninth it's size?
  30. physics

    Determine the force of interaction between 2 electric charges q1= 1x10-6 C and q2= 2x10-6 C at the distance r = 2 m. I think the formula is F=kq1*q2/r2? How do I find k?
  31. physics

    a robot drops a camera off the rim of a 239 m high cliff on Mars, where the free-fall acceleration is 3.7 m/s
  32. physics

    With what tension must a rope with length 2.70 and mass 0.150 be stretched for transverse waves of frequency 43.0 to have a wavelength of 0.850 ?
  33. Physics

    A car is backing up at a rate of 10km/hr. If the driver looks through his rear-view mirror, how fast does a tree, which is behind him, appear to approach him?
  34. physics

    How do the pressure variations with depth affect our ability to explore the ocean? Consider the challenges of scuba diving and submarines.
  35. Physics

    Two planes approach each other head-on. Each has a speed of 765 km/h, and they spot each other when they are initially 11.0 km apart. How much time do the pilots have to take evasive action?
  36. physics

    two ropes are tied on a post and applied with forces of 8 and ion.If the amgle between them is 60degrees. Find the resultant vector
  37. physics

    How long does it take for the ball to hit the ground 7 meters below if it's thrown straight up wit intial velocity of 2 m/s squared?
  38. Physics

    A Ferris wheel has a radius of 14 m. What period of rotation would give the occupants a feeling of "weightlessness" at the top? __s
  39. Physics

    A red colored ball tossed upward reaches a maximum height of 3.0m. show that the initial speed is 7.7m/s^2.
  40. Physics

    If a space station must "provide one sixth the magnitude of the acceleration due to gravity on Earth" Can I use 9.81ms^-2/6 or is that too simple? Thanks.
  41. physics

    A car accelerates uniformly from rest to a speed of 21.2 km/h in 8.3 s. Find the distance it travels during this time. Answer in units of m
  42. Physics

    A body is projected at angle of 30 degree with the horizontal at an initial speed of 200m/ far from the point of projection will it strike
  43. Physics

    How much energy is stored in a 2.90-cm-diameter, 14.0-cm-long solenoid that has 200 turns of wire and carries a current of 0.790 ?
  44. physics (vector)

    the direction of forces 1n,2n,3nacting at a point are parallel to the sides of an equilateral triangle.the magnitude of the resultant is what? How
  45. physics

    What constant net force is required to bring a 1500 kg car to rest from a speed of 100 km/h within a distance of 55 m?
  46. physics

    If a 2000 pound train tilts of a 20 foot cliff at a 135 angle how long will it take to reach the ground?
  47. Physics

    Hi! Ijust have one question that I don't know how to do: (a)How long will it take a freely falling body to acquire a speed of 58.8 m/s^2.(b) How far will it have fallen during that time?
  48. physics

    a car traveling at 7.0 m/s accelerates uniformly at 2.5 m/s to the 2nd power to reach a speed of 12.0 m/s. how long does it take for this acceleration to occur.?
  49. physics

    Marks: 2 The emf produced in a generator is What is the frequency of rotation of the circular coil? Choose one answer. a. 100 Hz b. 60 Hz c. 50 Hz d. 25 Hz
  50. Physics

    A police cruiser is travelling at 24 m/s and slows down at a rate of 0.65 m/s2 until it stops. The distance traveled by the cop while slowing down is closest to
  51. physics

    A car is heading towards a brick wall at 80 km/hr, he starts breaking 30 feet away. What acceleration is required to avoid a collision?
  52. AP Physics<<help

    A 1.7 kg bundle starts up a 30 degree inlcine with 105 J of Kinetic Eneergy, How far will it slide up in the plane if the coefficient of friction is .3 ?
  53. Physics

    A 84.0-kg airplane pilot pulls out of a dive by following, at a constant speed of 163 km/h, the arc of a circle whose radius is 312.0 m.
  54. Physics

    Find the speed of a pendulum bob at the bottom of its swing if its initial displacement is 5.34o and its period is 2.534 s.
  55. Physics

    What angular speed (in revolutions/second) is needed for a centrifuge to produce an acceleration of 1000g at a radius arm of 15.0cm?
  56. physics

    If a cyclist traveling at 14.0m/s skids to a stop in 5.60 s, determine the skidding distance assume uniform acceleration? Answer is 39.2m
  57. Physics

    A car requires velocity of 36 km/h in 10sec just after the start . It takes 20sec to stop . Calculate the acceleration in both the cases .
  58. Physics

    The highest that George can suck water up a very long straw is 2.0 m. (This is a typical value.) What is the lowest pressure that he can maintain in his mouth?
  59. Physics

    A soccer player launches a ball at an angle of 40 degrees, with an initial velocity of 23 m/s. What are the horizantal and vertical for this problem??

  61. physics

    calculate the momentum ofa toy car weighing 200 gram and moving with a velocity of 5meter/second?
  62. physics

    A boy moves 5km eastward and then change his direction towards westward in 4km.calculate his resultant displacement
  63. Physics help!

    The range of human hearing extends from approximately 20 Hz to 20,000 Hz. Find the wavelengths of these extremes at a temperature of 2°C. 20 Hz? 20000 Hz?
  64. Physics

    Measurements can be described as accurate and/or precise. Define accuracy and precision and give examples of how those terms could be used to describe a measurement.

    A stone propelled from a catapult with a speed of 50m/s attains a height of 100m.Calculate:(a)the time of flight?
  66. physics

    A softball bat is rotating at 460 rotations per minute at contact with the ball. What is the angular velocity in radians?
  67. physics

    How much heat is needed to raise the temperature of 0.800kg ethyl alcohol from 15celsius to its boiling point at 78.3celsius?
  68. physics

    which one of the property is true for mirror 1-refraction 2-refletion 3-communication 4-measuring length 5-gravity 6-heating object
  69. Physics

    A 3kg block is resting on a table with a coefficient of friction of 0.4. It is now pushed with a force of 15n. What is the acceleration of the book?
  70. physics

    A uniform steel chain 20 m long and with a mass of 5 kg per m, hangs vertically. Compute the work required to wind it up
  71. physics

    a man holds a child on his shoulders while watching a football match. How much work has he done if the game lasts for 2 hours
  72. Physics

    a major league outfielder throws a baseball horizontally with a velocity of 22 m/s, released from a height of 1.8m. how far does it go before it hits the ground ?
  73. Physics

    George drops a stone from atop a cliff of 25m. How long does it take to hit the ocean below, what velocity is it travelling when it gets there?
  74. Physics

    please help: "george drops a stone from atop a cliff of 25m. How long does it take to hit the ocean below, what velocity is it travelling when it gets there?"
  75. physics

    i need help with this one! A 100KHz oscillator that's followed by a doubler and two triplers will produce an output of frequency.... a.) 180 kHz b.) 500 " c.) 800 " d.) 1.8 "
  76. Physics

    A copper ball 2 cm in radius is heated in a furnace to 400 degree celsius. if its emissivity is 0.3, at what rate does it radiates?
  77. physics

    what is the length of the shortest pipe closed on one end that will have a fundamental frequency of 60 hz on a day when the velocity of sound is 340 m/s?
  78. Science Physics

    You walk 30 m south and 30 m east. Find the magnitude and direction of the resultant displacement both graphically and algebraically
  79. physics

    a long jump athlete take off at 25 degree with the horizontal and achieves a jumping distance of 9.12 m. Calculate initial take off speed.
  80. physics

    a uniform plank of lenght 5m and a mass1kg support two masses of 500g and 300g . determine the centre of gravity
  81. physics

    A vector representing 170 N is oriented at 30 degrees with the horizontal. What is the magnitude of the vertical component? Answer in units of N,
  82. physics

    a toy moves on a horizontal surface with a speed of 3m/ makes 8 turns in 5 seconds,whats the diameter of the wheel?
  83. Physics B

    A car slows down from 23 m/s to rest in a distance of 85m. What is its constant acceleration? I got -6.224, but a friend was telling me it's -3.11 and that I had to divide by 2. Why is that?
  84. physics (pendulums)

    i understand the PE and KE and MKE points and how gravity effects a pendulum, but how does kenetic and potential energy effect it?
  85. Physics

    Which of the following physical properties can be used to measure temperature using a thermometer? A. volume B. pressure C. density D. viscosity I think the correct answer is D?
  86. Physics

    What is the critical angle of light traveling from benzene (n=1.501) into air? 40.05o 48.22o 41.78o 62.63o
  87. physics

    for an 84 kg person standing at the equator what is the magnitude of angular momentum about the earths center due to earth's rotation
  88. PHysics

    What is the total energy of a 15-kg mass attached to a spring oscillating horizontally with an amplitude of 20 cm and an angular frequency of 32 rad/s?
  89. physics

    A bat at rest sends out ultrasonic sound waves at 51.1 and receives them returned from an object moving directly away from it at 22.3 .
  90. physics

    A car of mass 500kg and velocity=36km/h and suddenlybreak applied 150m calculate the force and work done?

    What is the magnitude of the electric field between two large parallel plates 2.0cm apart if a potential difference of 450 V is maintained between them?
  92. physics

    Calculate the cost of operating a 65 W light bulb continuously for a 30-day month when electrical energy costs $0.23/kW·h. $ 1
  93. Physics

    A 70-kg ancient statue lies in the bottom of the sea. It’s volume is 3.0 x 10 4 cm 3 How . much force is needed to lift it? (Use g=10 m/s 2 and the density of water is 1.0 x 10 3 kg/m 3
  94. College Physics

    A 750 kg rocket accelerates straight upward from the ground at 60 m/s2. What is the force (thrust) provided by the engine?
  95. Physics

    It takes you 9.5min to walk with an average velocity of 1m/s to the north from the bus stop to the museum entrance. What is your displacement?
  96. physics

    Find the wavelength (in nm) of a photon whose energy is 5.90 x 10-19 J. I understand that I have to use this equation to figure out the problem E=nhf, I just keep getting the wrong answer. Which is 33.68 nm
  97. physics

    what is reaction product when ethene is treated with steam using phosphoric acid as catalyst at 300 degrees celcious
  98. physics

    Two freight cars, each with a mass of 3.9 105 kg, collide and stick together. One was initially moving at 3.2 m/s and the other was at rest. What is their final speed in m/s?
  99. physics

    Two freight cars, each with a mass of 3.9 105 kg, collide and stick together. One was initially moving at 3.2 m/s and the other was at rest. What is their final speed in m/s?
  100. physics

    A ball is thrown directly downward with an initial speed of 8.95 m/s, from a height of 29.0 m. After what time interval does it strike the ground?