physics please HELP !

74,760 results, page 83
  1. PHYSICS

    IT TAKES YOU 9.5 MIN TO WALK AN AVREAGE VELOCITY OF 1.2 M/S TO THE NORTH FROM THE BUS STOP TO THE MUSEUM ENTRANCE. WHAT IS YOUR DISPLACEMENT?
  2. Physics

    Calculate the net charge on a substance con- sisting of a combination of 1.9 × 10^13 protons and 3.9 × 10^13 electrons. Answer in units of C.
  3. science (physics)

    a skaterboarder is moving 5.25 m/s when he starts to roll up a frictionless hill. how much higher is he when he comes to a stop? (energy problem)
  4. Physics

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

    what frequency and period would be required for sally and her hard-working partner to produce a standing wave with three nodes?
  6. physics

    an american bald eagle heads south at 3.2 m/s, but encounters a wind blowing from the east at.97 m/s by how many degrees will she be blown off course?
  7. Physics

    Sunlight strikes a fused quartz surface. At what angle of incidence is the reflected light completely polarized?
  8. physics PLEASE HELP ME

    A ball rolling down a hill was displaced at 19.6m while uniformly accelerating from rest. If the final velocity was 5.00 m/s what was the rate of acceptation?
  9. physics

    A 326 g object is attached to a spring and oscillates with a period of 0.25 s. The total energy in this system is 5.83 J. What is the amplitude of the motion?
  10. Physics

    1. What is happening to that air between the instruments and your ears? 2. How can you produce the change in the frequency? 3. Describe how the notes are produced in a violin?
  11. physics

    find the change in momentum of a car weighing 1500kg when its speed increases from 36km/h to 72km/h uniformly
  12. Physics

    A wagon was used to move a 90 lb rock 120 yds. It took 40 sec and 70 lbs of force. Can someone help me solve for efficiency and horsepower????? PLEASE :)
  13. 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
  14. physics

    A quantity of steam (750 g) at 122°C is condensed, and the resulting water is frozen into ice at 0°C. How much heat was removed?
  15. Science - PHYSICS

    im having problem understanding what motion equation to use. " A motercycle moving 12 m/s [W] accelerates at 6.0 m/s [W]. How long will it take to experience a displacement of 63 m [w] ? "
  16. PHYSICS

    The velocity of a diver just before hitting the water is -8.7 m/s, where the minus sign indicates that her motion is directly downward. What is her displacement during the last 0.89 s of the dive?
  17. physics

    A 1.0kg ball initially at rest rolls down a plane at 35 degrees. Find the net force. pls i really need help
  18. Physics

    Suppose a cube that measures 0.020 m on each side were made of water. Find its volume, mass, and weight.
  19. physics

    formulation of hypothesis for the prepation of a standard solution of oxalic acid with a concentration of 0.05mol.dm3. very desperate
  20. physics

    If a flea can jump straight up to a height of 0.310 m, what is its initial speed as it leaves the ground? How long is it in the air?
  21. physics

    Write a multiple-choice question that requires the reader to apply conservation of momentum to a system of two objects.
  22. 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?
  23. physics

    what sould be the angular speed with which the earth have to rotate on its axis so that a person on the equator would weight 3/5th as much as present..??
  24. PHYSICS

    (a) how long it took King Kong to fall straight down from the top of a 210 m high building s (b) his velocity just before "landing"
  25. physics

    Calculate the time required for an astronaut to free-fall 50 m on the Moon. Please show and explain steps answer is 7.9s
  26. Physics

    conical pendulum is formed by attaching a 0.200 ball to a 1.00 -long. It has a radius of 40.0cm . What is the tension in the string?
  27. physics

    Thirty microcoulombs of NEGATIVE charge experiences an electrostatic force of 27. mN. What is the magnitude and direction of the electric field?
  28. 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?
  29. Physics

    If a car is travelling with a constant speed of 5.53 m/s in the Westward direction, what is the resultant force acting on it? Ignore friction
  30. Physics

    consider a cart being pulled up an inclined plane by a student during a Physics lab. The applied force on the cart is 18 N is directed parallel to the incline to cause the cart to be displaced parallel to the incline for a given displacement of 0.7 m. The
  31. Physics

    consider a cart being pulled up an inclined plane by a student during a Physics lab. The applied force on the cart is 18 N is directed parallel to the incline to cause the cart to be displaced parallel to the incline for a given displacement of 0.7 m. The
  32. Physics repost please check

    Posted by Mary on Monday, November 5, 2007 at 8:19pm. A charged particle, passing through a certain region of space, has a velocity whose magnitude and direction remain constant. (a) If it is known that the external magnetic field is zero everywhere in
  33. Physics please check repost

    The pressure and volume of a gas are changed along a path ABCA in the figure. The vertical divisions on the graph represent 4.0 x 10^5 Pa, and the horizontal divisions represent 4.5 x 10^-3 m3. The diagram is a upright rectangle divided into small squares
  34. physics

    Biophysics strikes back The Biophysics students are having their usual Saturday night biophysics party performing physics experiments at a classmate’s home. This Saturday it is in an apartment building and you notice a managemnt student (MS) passed out
  35. Physics please clarify

    A charge of -3.00 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.135 m). The charges on the circle are -3.20 µC at the position due north and +5.00 µC at the position due east. What is
  36. physics

    A physics student pulls a block of mass m = 23 kg up an incline at a slow constant velocity for a distance of d = 4 m. The incline makes an angle q = 25° with the horizontal. The coefficient of kinetic friction between the block and the inclined plane is
  37. Physics

    A certain number of identical resistors are connected in series and their total resistance is measured. When the resistors are disconnected and re-connected in parallel, their total resistance drops to one-percent of the value measured when they were
  38. physics

    A physics student pulls a block of mass m = 20 kg up an incline at a slow constant velocity for a distance of d = 4.5 m. The incline makes an angle Δ = 30° with the horizontal. The coefficient of kinetic friction between the block and the inclined
  39. physics

    Tony£¬a 110kg football player£¬has a fever of 39celcius. What mass of water must evaporate from his body to cool him to 37celcius£¿
  40. physics

    A piano tuner hears one beat every 2.8 s when trying to adjust two strings, one of which is sounding 440 Hz, so that they sound the same tone. How far off in frequency is the other string?
  41. physics

    How far to the nearest tenth of a meter can a runner running at 10 m/s run in the time it takes a rock to fall from rest 99 meters?
  42. physics

    How far to the nearest tenth of a meter can a runner running at 11 m/s run in the time it takes a rock to fall from rest 78 meters?
  43. Physics

    The coefficient of kinetic friction for a 22 kg bobsled on a track is 0.15. What force is required to push it down a 6.0° incline and achieve a speed of 64 km/h at the end of 75 m?
  44. Physics!

    How many joules of potential energy does a 1.2-kg book gain when it is elevated 4.0 ? Express your answer to two significant figures and include the appropriate units.
  45. physics

    Calculate the magnitude of the electric field at one corner of a square 1.48m on a side if the other three corners are occupied by 1.92×10−6 Ccharges.
  46. physics

    1. During storm roof of house is blown off 2.It is dangerous to stand near the railway track when a train is moving with high speed
  47. physics

    If a professional jumper jumps in a running trainn and remains in air (say,4 ~5 sec),does he returns back his original position?
  48. Physics

    a horizontal force Pushes a 80 N box up a frictionless 37 degree incline at a constant velocity as shown.? What is the magnitude of P in newtons?
  49. Physics

    how far to the nearest tenth of a meter can a runner running at 7.9 m/s run in the time it takes a rock to fall from rest 65 meters?
  50. physics 1

    a helicopter is flying at an altitude of 1000 m above the ground, with a horizontal velocity of 50 m/s, how far from the rally point should the relief package be dropped?
  51. physics

    Analyze the radial distribution of the H-atom at the 2s state. How are the maxima situated with respect to the minimum? Is the “golden ratio” involved?
  52. Physics

    A stone thrown upward to just reach the top of a palm tree that is 8.2m tall. Calculate the initial speed that is require
  53. physics

    Find the pottential energy of a boy of mass 10kg standing on a building floor 10 meters above the ground level p.e?
  54. physics

    A person walks 25m west and then 45m at an angle of 60 degrees north of east. What is the magnitude of the total displacement?
  55. physics

    A particle is drop from a vertical height (h) and falls freely for a time(t) with the aid of a sketch explain how (h) varies with (I) t (ii) t square
  56. physics

    A ball is thrown upward from a platform 4.6 m high with a speed of 23 m/s at an angle of 40 o from the horizontal. What is the magnitude of its velocity when it hits the ground?
  57. physics

    A 1.2 lead ball is launched off a cliff top at 16 m/s Determine the balls kinetic energy at position P. Ignore friction
  58. physics

    one car moving on a straight road covers 1/3 of the distance with 20kmph and the rest with 60kmph find th average speed
  59. physics

    If you drop an object, it will accelerate down- ward at a rate of g = 9.8 m/s2. If you throw it downward instead, its accel- eration (in the absence of air resistance) will be
  60. Physics

    An Object moves along x-axis such that its position varies with time according to the relation x=50t-5t^2.Here x is in meters and t in seconds.Average Speed between t=0 to t=6s.
  61. physics

    Use the fact that the speed of light in a vacuum is about 3.00 108 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 4.9 hour(s)
  62. physics

    A 912 kg drag race car accelerates from rest to 108 km/h in 0.795 s. What change in momentum does the force produce?
  63. Physics check

    According to Bohr, an electron in an excited state could give off ..... a continuous cascade of photons for a high-level transition.
  64. physics

    a monatomic gas initially at 19 degree celsius is suddenly compressed to 1/10th its original volume .what is temperature after compression?
  65. Physics

    A racing car has a mass of 1530 kg. The acceleration of gravity is 9.8 m/s^2. What is its kinetic energy if it has a speed of 136 km/h? Answer in units of J.
  66. physics

    at a local country fair, the merry-go-round rotates at a rate of one circuit every 7.5 seconds. what is the angular velocity in radians per second
  67. physics

    Use the fact that the speed of light in a vacuum is about 3.00 108 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 4.9 hour(s)
  68. Physics

    For adults, the RDA of the amino acid lysine is 12 mg per kg of body weight. How many grams per day should a 73.0kg adult receive?
  69. physics

    Two particles with Q1 = 40 µC and Q2 = 87 µC are initially separated by a distance of 2.6 m and then brought closer together so that the final separation is 1.7 m. What is the change in the electric potential energy?
  70. physics

    a projectile is fired at 30 degree above the horizontal with an initial speed of 600 m/s. find the direction and magnitude of the velocity after 2 seconds?
  71. Physics

    Two people pushing a stalled car from rest generate a net force of +840N for 5.0s. What is the cars final velocity?
  72. physics

    the Ferris wheel has a diameter of 150m and takes 30min to make a full circle. Determine the speed of ride in m/s
  73. Physics

    A player kicks a football from ground level with a velocity of magnitude 31.0 m/s at an angle of 30.0 degrees above the horizontal. What is its maximum height?
  74. physics 101

    a converging lens has a focal length of 10.0 cm. find the location of the image for object distances of a) 40.0cm b) the magnification
  75. Physics

    You are testing a car on the Nevada salt flats traveling 85 m/s. Your parachute deploys and you decelerate at 13 m/s^2. How long does it take to come to a complete stop?
  76. physics

    A 750 kg rocket accelerates straight upward from the ground at 60 m/s2. What is the force (thrust) provided by the engine? with a gravitational pull of 10 m/s2 down
  77. physics urgent please

    Give an example of projectile motion;include in your explantion the term "velocity" , "accleration" and "displacement", orginality in your example will be appreciated?
  78. Physics

    An object of mass 20kg slides down an inclined plane at an angle of 30 degree to the horizontal. The coefficient of static friction is?
  79. physics

    What is the acceleration (in meters/second^2) of free falling 74kg sky diver, if the air resistance exerts a force of 233n?
  80. Physics

    A material that remains highly magnetized after a magnetization cycle has a large hysteresis area. Answer True False
  81. physics

    Time() 0 2 4 6 8 10 12 14 16 Velocity() 0 0 2 5 10 15 20 22 22 By measuring the slope of your curve, find the magnitude of the instantaneous acceleration at times = 9s i don't know how to solve it
  82. physics

    A 2.0 m wire segment carrying a current of 0.60 A oriented parallel to a uniform magnetic field of 0.50 T experiences a force of what magnitude
  83. Physics

    A block weighing 6.2 N requires a force of 2.2 N to push it along at constant velocity. What is the cooefficient of friction for the surface? Plsssss help asap..
  84. Physics

    Calculate the vertical distance an object dropped from rest would cover in 12s if it fell freely without air resistance.
  85. Physics

    How fast (in rpm) must a centrifuge rotate if a particle 69-cm from the axis of rotation is to experience an acceleration of 200438 g's? (can you show me how you get the answer) be thorough
  86. physics

    A 2.0 kg mass is sliding on a flat surface, with an initial speed of 20 m/s, and a coefficient of friction of 0.2. what is the magnitude of its acceleration? I know the answer is 2.0 m/s^2, but can someone show me how ?
  87. Physics

    two equal charges exert an elecrtric force on each other of 0.0385N when positioned 0.15m apart determine the magnitude of the charge on each point.
  88. Physics 141

    A car is on a circular track of radius r = 100 m. It's tangential speed is 30 m/s. How many lateral gravities does the driver feel?
  89. Physics

    In a 100 m linear accelerator, an electron is accelerated to 1.40% the speed of light in 35.0 m before it coasts 65.0 m to a target. (b) How long does the total flight take?
  90. physics

    You want to design a curve, with a radius of curvature of 35.0 m, so that a car can turn at a velocity of 15 m/s on it without depending on friction. At what angle must the road be banked?
  91. physics

    Explain why it would not make sense to use a full-size glass thermometer to measure the temperature of a thimbleful of hot water?
  92. physics

    What is the centripetal force of an object undergoing uniform circular motion when its radius is doubled and its speed remains constant?
  93. physics

    a d'arsonval meter movement deflects to 0.8mA. what is the peak value of the alternating current if the instrument uses full-wave rectification?
  94. Physics

    Yes - if it is the same person answering it - it is me again! My question has STILL not been answered... How would I solve for upwards acceleration with this kind of image, assuming mass and force are given.
  95. Physics

    If m1 = 4.72kg, what mass m2 is required to balance the system? (two masses are connected by a rope. m1 is sitting on an incline and m2 is hanging from a pulley)
  96. physics

    At what displacement from the equilibrium is the total energy of a simple harmonic oscillator one - sixths KE and five - sixth PE? Answer should be in terms of the amplitude A.
  97. physics

    an object weighs 10N on earth .what is the objects weight on a planet one tenth the earths mass and one half its radius?
  98. Physics

    A sample of charcoal from an archaeological site contains 55 g of carbon and decays at a rate of .877 Bq. How old is it? ok I am totally lost, I don't know where to start
  99. physics

    How far to the nearest tenth of a meter can a runner running at 15 m/s run in the time it takes a rock to fall from rest 68 meters?
  100. physics

    a watermelon has a mass of 8kg and 600 g . how mich force of gravity of the earthwill it experience ?what will be its weight on the earth and the moo