215,206 results, page 81

  1. physics

    a bullet initially moving with a velocity 20m/s strikes a target and comes to rest after penetrating a distance 10cm in
  2. physics

    If the breakers at a beach are separated by 5m and hit shore with frequency of 0.3Hz, at what speed are they travelling? Please show all work, Thank you
  3. physics

    How does the presence of an atmosphere affect the length of day and night? I am thinking by the rising and setting of the moon and sun. Is this right? Thank You.
  4. physics

    a 1200-kg automobile travels at a speed of 90-km/h (a)what is the kinetic energy? (b) what is the net work that would be required to bring it to a stop?
  5. Physics

    Sunlight strikes a fused quartz surface. At what angle of incidence is the reflected light completely polarized?
  6. 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.
  7. 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
  8. physics

    what is the force required to start moving a 25kg box across a concrete floor with a coefficient of static friction of .65?
  9. physics

    How long will it take a 1879W motor to lift a 309kg piano to a window 15.4m above? what is the equation? here are my givens P= 1879 w m= 309 kg h= 15.4 m t= ? s
  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

    a toy moves on a horizontal surface with a speed of 3m/ makes 8 turns in 5 seconds,whats the diameter of the wheel?
  12. 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
  13. Physics

    The work done in rubbing your hands together s equivalent to the amoun of heat produced. What principle does this demonstrate? I am not sure, is it kinetic energy?
  14. 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?
  15. physics

    A skateboarder, with an initial speed of 4.2m/s , rolls virtually friction free down a straight incline of length 16m in 3.3 s.
  16. physics

    In the following list of periodic waves, which one is independent of the others: frequency, wavelength,speed,amplitude? Plese show all work Thank you

    A 60.0 kg rocket accelerates upward from rest reaching a height of 23.4 m in 3.0 seconds. what is the thrust force produced by the engine?
  18. physics

    the frequency of middle C on a piano is 261.6hz. What is the wavelength of sound as it travels @room air and in water?
  19. 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*2
  20. Physics

    a proton moves in a circle in a uniform magnetic field of 1T, pointing into the page. Its speed is 1.5 x 10 ^5 m/s. What is the radius of its path?
  21. science physics

    Two locomotives approach each other on parallel tracks. Each has a speed of v = 95 km/h with respect to the ground. If they are initially d = 7.5 km apart, how long will it be before they reach each other?
  22. Physics

    A 0.2 kg glass cup at 20 C is filled with 0.4 kg of hot water at 70 C. Neglecting any heat losses to the environment, what is the equilibrium temperature?
  23. Physics

    If it takes a particle in SHM 0.20 s to travel from the equilibrium position to the maximum displacement (amplitude), what is the period of oscillation?
  24. 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?
  25. physics

    The car is travelling along the road with a speed of v  (300 / s) m/s, where s is in meters. Determine the magnitude of its acceleration when t = 3 s if t = 0 at s = 0. ( ans: a = 1.28 m/s2).
  26. Physics

    A baseball has a mass of 0.15 kg. A pitcher throws a 40 m/sec fastball which is caught by the catcher. What is the change in momentum of the ball?
  27. physics

    A car traveling initially at 9.52 m/s acceler- ates at the rate of 0.609 m/s2 for 3.62 s. What is its velocity at the end of the accel- eration?
  28. 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?
  29. physics

    Is this true or a trick question? In order to get a piano to start moving, you must push against it with a larger force than it pushes on you?
  30. Physics

    A skier is gliding along at 5.0{\rm m/s} on horizontal, frictionless snow. He suddenly starts down a 15{\rm ^{\circ}} incline. His speed at the bottom is 15{\rm m/s} .
  31. physics

    Geostationary satellites are placed on orbits of radius 4.2×10^4m use this information to deduce g, the acceleration of freely falling body, at this height.
  32. 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?

    What is the acceleration (in meters/second^2) of a freely falling 73.0 kg sky-diver, if air resistance exerts a force of 273 N?
  34. Physics

    A bean jumps vertically off of a table. It has a speed of 10 m/s when it reaches half of its maximum height. How high does it rise?
  35. Physics

    A myopic student is shaving without his glasses. If his eyes have a far point of 1.5, what is the greatest distance he can stand from the mirror and still see his image clearly?
  36. Physics

    What is the average braking force required of a 1200kg car in order for it to come to rest from 60km/h in a distance of 25m
  37. Physics

    Which object has a greater momentum, a stationary tractor-trailer or a tossed tennis ball? Explain your answer please.
  38. Physics

    Explain why the mass of the vehicle does not affect the calculated maximum or minimum velocities for cars on banked curves.
  39. physics

    Hi, We have taken the Poiseuille's Equation yesterday, and I need some simple exercises about it to be familiar with it, because it is hard to memories . Please if you know any useful website tell me or give me its URL. Thank you.
  40. Honors Physics Question

    Two objects are near a bar magnet. One is about 1 cm away, while the other is 6 cm away. Compare and contrast the magnetic force that affects each object. What do they want me to do?
  41. physics

    Calculate the Coriolis acceleration of an aeroplane flying along the equator due east at a speed of 300m s−1.
  42. Physics

    A bomb explores in mid air into two equal fragments.what is the angle between their direction of motion? Ans:- 180°
  43. physics

    a bullet fired into a target loses half its velocity after penetrating 25cm.How much further will it penetrate before coming to rest ?
  44. physics

    An object slides down a frictionless 33 degree incline whose vertical height is 37.0 cm. How fast is it going in meters/second when it reaches the bottom?
  45. physics

    the constant velocity of a ball is (3x+2y)m/sec. find the distance traveled in the y direction in 2 seconds (x and y are unit vectors)?
  46. 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?
  47. physics

    An airplane flies north at a constant speed for 6h and covers a distance of 2400km. What is the plane's velocity? The acceleration?
  48. physics

    what is the formula for finding the magnitude of average acceleration simplified into length, velocity, time, and delta units?
  49. physics

    a jogger does 2.5 *10^5 of work during an exercise routine. her internal energy decreases by 6.8*x10^5. how much heat did she absorb or give off?
  50. physics

    what force is needed to accelerate at child on a sled at 1.4 meters per second square (total mass 55 kilo gram)
  51. Physics

    A block of mass 0.585 kg is placed on the end of a spring which has a stiffness of 294 N/m. It is pulled down 2.80 cm and released. What is the frequency of oscillation?
  52. physics

    What is the minimum work function for a metal for visible light (wavelengths between 400 and 700 ) to eject photoelectrons?
  53. 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?
  54. physics

    what is the coefficient of kinetic friction between a 2kg brick and concrete if it takes 9.0N of force to move it at a constant rate?
  55. physics

    A satellites are placed in a circular orbit that is 2.44 × 107 m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance?
  56. 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?
  57. Physics

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

    A bug completes one lap along the edge of a circular planter of radius 22.4 cm in 16.45 s. How fast was it traveling? Answer in units of cm/s.
  59. Physics

    The displacement of a harmonic oscillator is given by y = 8.4 sin(14t), where the units of y are meters and t is measured in seconds. What is its maximum velocity?
  60. physics

    to view full image of an object 160 cm high, the minimum size of the plane mirror required is?
  61. 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?
  62. 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?
  63. Physics

    How does Rutherford's model of the atom account for the back-scattering of alpha particles directed at the gold foil?
  64. physics

    A vector points 34.8 degrees to the Northeast with magnitude 15. What are the north and east components that make up the remainder of the triangle?
  65. Physics

    A car traveling initially at 7.49 m/s acceler- ates at the rate of 0.743 m/s2 for 5.41 s. What is its velocity at the end of the accel- eration?
  66. physics

    If a ball is kicked at 35 degrees above the horizontal, what is the speed to barely clear the 3m tall goal post 60m away?
  67. Physics

    If a ball is kicked at 35 degrees above the horizontal, what is the speed to barely clear the 3m tall goal post 60m away?
  68. physics

    A motorboat traveling on a straight course slows down uniformly from 75km/h to 40km/h in a distance of 50m. What is the boat’s acceleration?
  69. physics

    A motorboat traveling on a straight course slows down uniformly from 75km/h to 40km/h in a distance of 50m. What is the boat’s acceleration?
  70. physics

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

    By how much shoould a pair of light rays from a common source differ in length to produce destructive interference?
  72. College Physics II

    If a capacitor has 3.84 μC of charge on it and an electric field of 2.22 kV/mm is desired if they are separated by 3.80 mm of air, what must each plate's area be?
  73. physics

    A duck waddles 2.3m east and 7.0m north. what are the magnitude and direction of the ducks displacement with respect to its original position?
  74. Physics

    If 500 grams of a metal requires 70 calories of energy to raise its temperature by 10 Kelvin, what is its specific heat?
  75. physics:energy

    How much power is needed to push a box (mass 27 kg) over a surface (coefficient of friction μk=0.5) with a velocity of 1.1 m/s?
  76. physics

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

    Find the electric field at P in the figure shown below. (Take r = 1.5 m and θ = 41°. Measure the angle counterclockwise from the positive x-axis.)
  78. Physics

    Neglecting air resistance, how high could a 0.15kg baseball be thrown if it is throw straight up at a speed of 25m/s?
  79. physics

    Measure of two quantities along with the precision of respective measuring instrument is A = 2.5 m s–1 ± 0.5 m s–1 B = 0.10 s ± 0.01 s The value of A B will be (a) (0.25 ± 0.08) m (b) (0.25 ± 0.5) m (c) (0.25 ± 0.05) m (d) (0.25 ± 0.135) m please tell me the correct ...
  80. 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)
  81. Physics

    How fast must a 138 g baseball travel in order to have a de Broglie wavelength that is equal to that of an x-ray photon with A = 100. pm?
  82. physics

    A person has a mass of 50.0 kg. What is the pressure they exert on the blades of their ice skates if each skate blade is 15.0 cm long and 5.00 mm wide?
  83. 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?
  84. Physics

    A golf ball is struck with a five iron on level ground. It lands 85.0 m away 4.60 s later. What was the magnitude and direction of the initial velocity
  85. Physics

    A loaded truck can accelerate at 4 m/s 2. It loses its load so that it is only 0.1 as massive. By what factor must the acceleration change for the same driving force?
  86. AP physics

    suppose that the surface (radius=r) of the space station is rotating at 35.8 m/s. what must be the value of r for the astronauts to weigh one-half their earth weight?
  87. Physics

    A loaded truck can accelerate at 4 m/s 2. It loses its load so that it is only 0.1 as massive. By what factor must the acceleration change for the same driving force?
  88. physics

    A baseball is thrown from the roof of a 24.0-m-tall building with an initial velocity of magnitude 10.0 m/s and directed at an angle of 53.1° above the horizontal.
  89. physics relativity

    An observer on Earth sees you travel 1000 m at half the speed of light. What distance do you think that you travelled?
  90. physics

    Describe briefly how the volume of a given mass of water changes when it is cooled from 7 ^0 C to 1^0 C use the terms increase, decrease and maximum or minimum
  91. physics

    A 2.284 km car is moving down a road with a slope of 13% at a constant speed of 11 m/s. What is the direction and magnitude of the frictional force?
  92. Quantum Physics

    What is the maximum value of the wavelength of light that will ionize the hydrogen atom? Express your answer in units of nanometers.
  93. Physics

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

    A satellite orbits at an average altitude of h = 441 km. What is its orbital speed? Use REarth = 6370 km and mEarth = 5.98 x 1024 kg.
  95. 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 :)
  96. Physics

    at what distance would a convex magnifing lens that has a focal length of 10 cm have to be held for an image to appear upright and 3 cm tall? [6.67cm]
  97. physics

    Five forces act on an object. (1) 57 N at 90° (2) 40 N at 0° (3) 77 N at 270° (4) 40 N at 180° (5) 50 N at 60° What are the magnitude and direction of a sixth force that would produce equilibrium?
  98. Physics

    A satellites are placed in a circular orbit that is 1.62 × 108 m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance?
  99. Physics

    A proton moving at 500000m/s enters a series of charged parallel plates. What is the impact speed on the last plate.
  100. physics help please

    An airplane that can fly at 300 km/hr is flying at 210 when it is hit by a wind of 125 km/hr at 110. What is the new velocity of the plan?
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