Physics!

74,459 results, page 84

  1. Physics Help

    What is the energy stored in the inductor shown in the figure after the switch has been closed for a very long time? Take V = 15 V, R = 600 §Ù and L = 10 mH.
  2. physics

    A diver with a mass of 70.0 kg stands motionless at the top of a 3.0 m high diving platform. Calculate his speed when he enters the pool. Thanks so much for helping!
  3. physics

    the current to an LC circuit is being supplied according to the function I(t)=2*sin(7t). what is the smallest value of t for which the inductor and capacitor each contain half of the energy?
  4. physics

    A ray of light in air strikes a glass plate (n = 1.50) at an incidence angle of 50 degrees. Determine the angles of the reflected and transmitted rays.
  5. physics

    What will be the equilibrium temperature when a 245-g block of copper at 285„aC is placed in a 145-g aluminum calorimeter cup containing 825g of water at 12.0„aC?
  6. principles of physics

    For which of these will the buoyant force be the same as its weight when placed in water? A) A match stick.B) All of these.C) A small rock.D) None of these.E) A nail.
  7. Physics

    You throw a plate off your roof with a speed of 10.0 m/s. 4.00 seconds later it hits the ground? How far? What equation do i use? Variables explain!
  8. Physics

    You throw a plate off your roof with a speed of 10.0 m/s. 4.00 seconds later it hits the ground? How far? What equation do i use? Variables explain!
  9. Physics

    How large must the coefficient of static friction be between the tires and the road if a car is to round a level curve of radius 85 m at a speed of 95 km/h?
  10. physics

    a boy weighing 350N runs up a flight of stairs consisting of 20 steps each 10cm high in 10 seconds. What is his power? show your workings
  11. 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.
  12. 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?
  13. 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
  14. Physics

    Where must an object be placed to have a magnification of 3.74 in front of a converging lens of focal length 14.1 cm? Answer in units of cm
  15. physics

    A 2 kg metal plate slides down a 14-meter high slope. At the bottom its speed is 11.1 m/s. To the nearest Joule, what was the magnitude of the work done by friction?
  16. physics

    A car weighing 1200kg was moving at a speed of 15m/s.breaks were applied and it stopped 6s latter.draw a graph showing the results
  17. physics

    Calculate the current that moves through your fingers (resistance 1000 \Omega) when you touch them to the terminals of a 6.4- V battery. please include the units
  18. physics

    a bar is pushed so that it slides across the floor. how far will it go, given the coefficient of kinetic friction is 0.25, and the push imparts an initial speed of 2.5m/s?
  19. Physics

    A uniform rectangular sign of width 51.6 cm, height 25.2 cm, and negligible thickness hangs vertically from supporting hinges attached at its upper edge.
  20. physics

    A ball its thrown straight up into the air at 50 m/s find the balls velocity after 8 seconds show all work please
  21. physics

    A person with a mass of 60kg climbs up to a diving board 4 meters above a swimming pool. what is the divers speed when entering the water? A 8.9m/s b 6.2m/s c 4.4m/s d 3.3m/s e 2.1 m/s
  22. physics

    A color television has a power rating of 325 W. How much current does this set draw from a potential difference of 120 V? 1 . A i got 2.42 but its wrong?
  23. physics

    A color television has a power rating of 325 W. How much current does this set draw from a potential difference of 120 V? 1 . A i got 2.92 but its wrong?
  24. physics

    A color television has a power rating of 325 W. How much current does this set draw from a potential difference of 120 V? 1 . A i got 2.92 but its wrong?
  25. physics

    question # 1 :Estimate the work you do to mow a lawn 13m by 23m with a 60cm wide mower. Assume you push with a force of about 15 N .
  26. physics

    an object is placed 10 cm from a concave spherical mirror whose radius of curvature is 12 cm. What is the distance of image a) 5cm b) 10 cm c)15cm d)20cm e)24cm
  27. physics

    a motorisrt accelerates their car to 36m/s before realising they are over the speed limit and decelerates to 32m/s. calculate the distance traveled
  28. Physics

    Why "weighing" individual atoms is a particular challenge? Using A small beam arranged as a cantilever, can be utilized as part of a sensing device.
  29. physics

    What will be the equilibrium temperature when a 273 g block of copper at 298°C is placed in a 132 g aluminum calorimeter cup containing 815 g of water at 11.4°C?
  30. physics

    pipe to know how the inner diameter changes. Rank in order from largest to smallest the gas speeds va, vb, and vc at points a, b, and c. Explain in complete sentences.
  31. 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]
  32. 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?
  33. physics

    Watching Old Faithful erupt, you notice that it takes a time for water to emerge from the base of the geyser and reach its maximum height.
  34. physics

    apositive cgarge Q is uniformly distributed around asemicircile of radius R.find the electric field (magneitud and direction)at the center of curvature P.
  35. Physics

    A racing car with mass (including the driver) of 900 kg accelerates from rest to a speed of 200 km/hr in 6 seconds. what is the power output of the engine?
  36. 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?
  37. 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
  38. 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?
  39. 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?
  40. Physics

    A ball thrown into the air lands on the same horizontal level, 31 m away, and 2.65 s later. Find the magnitude of the initial velocity.
  41. physics

    With an average acceleration of −0.96 m/s2, how long will it take a cyclist to bring a bicycle with an initial speed of 14.8 m/s to a complete stop? Answer in units of s
  42. physics

    A football player is running at a speed of 9m/s hits the goalpost and comes to a stop in 0.050 sec. Calculate his acceleration and compare it with that of gravity.
  43. Scinece, Physics

    A boy is throwing a stone from the top of a building. It takes projectile motion and returns to the ground. How to calculate the height of buiding?
  44. 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.
  45. physics

    An outfielder throws to the second baseman, a distance of 120ft at a 20degree angle. Whats the min velocity he has to throw the ball to get it to the base?
  46. physics

    what average force is needed to accelerate a 7.00-gram pellet from rest to 125m/s over distance of a .800m along the barrel of a rifle.
  47. 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?
  48. physics

    A 4.1-m-diameter merry-go-round is initially turning with a 4.2 period. It slows down and stops in 24 . Before slowing, what is the speed of a child on the rim?
  49. 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?
  50. 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?
  51. 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?
  52. Intergated chemistry/physics

    What is the momentum of a 100 kilogram football player moving with a speed of 3.5 meters/second. The units should be written as kg m/s.
  53. 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 .
  54. physics

    A loaded truck can accelerate at 4.8 m/s2. It loses its load so that it is only 0.4 as massive. By what factor must the acceleration change for the same driving force?
  55. Physics

    How much work did the movers do horizontally pushing a 160-kg crate 10.3m across a rough floor without acceleration, if the coefficient of friction was 0.50?
  56. physics college

    A lamp has a mass of 10kg and is supported by two wires that make an angle of 35 degrees between them. Find the tension in each wire?
  57. Physics

    A 69 kg skier speeds down a trail, as shown in the figure. The surface is smooth and inclined at an angle of θ = 17° with the horizontal. Help me with an equation to solve. thanks!
  58. Physics

    Determine the stopping distance for a skier moving down a slope with friction with an initial speed of 20.6m/s. Assume μk=0.178 and θ=5.27.
  59. Physics

    If a disk and hoop are released simutaneously 1.0m above the ground at a 30 degree incline which one will reach the bottom faster? Show mathematically.
  60. 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.
  61. physics

    A solid disk of radius 0.20 m and a mass of 1.0 kg starts at rest and then speeds up to 100 rad/s in 10s. What is the torque that produces this rotational acceleration?
  62. physics

    A solid disk of radius 0.20 m and a mass of 1.0 kg starts at rest and then speeds up to 100 rad/s in 10s. What is the torque that produces this rotational acceleration?
  63. physics

    Determine the moment of inertia for three children weighing 57.0 lb, 42.0 lb and 78 lb sitting at different points on the edge of a rotating merry-go-round, which has a radius of 12 ft.
  64. Physics

    A small but measurable current of 3.20 E-10 A. exists in a copper wire whose diameter is 0.03 cm. Calculate the electron drift speed (in meters/second).
  65. physics

    What is the angular momentum of a figure skater spinning at 4.4 with arms in close to her body, assuming her to be a uniform cylinder with a height of 1.6 , a radius of 15 , and a mass of 53 ?
  66. physics PLEASE HELP!

    The pilot of an airplane traveling 250km/h wants to drop supplies to flood victims isolated on a patch of land 190m below.
  67. Physics

    two equal charges exert an elecrtric force on each other of 0.0385 when positioned 0.15 apart determine the magnitude of the charge on each point.
  68. 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?
  69. physics

    A loaded truck can accelerate at 4.1 m/s 2 . It loses its load so that it is only 0.8 as massive. By what factor must the acceleration change for the same driving force?
  70. Physics

    Some neodymiun-glass lasers can provide 100 TW of power in 1.0 ns pulses at a wavelength of 0.26 um. How much energy is contained in a single pulse?
  71. physics

    A laboratory ultracentrifuge is designed to produce a centripetal acceleration of 4.0 106 g at a distance of 5.00 cm from the axis. What angular velocity in rev/min is required?
  72. Physics

    a particular jet aircraft must reach a speed of 80 m/s in order to take off. If the runway is 1500 m long, determine the acceleration
  73. Physics

    A model airplane has a mass of .90 kg and moves at a constant speed on a circle that is parallel to the ground. Find the tension in the guideline (length = 17 m) for speeds of 19 and 38 m/s.
  74. 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.
  75. physics

    an aluminium rod has a breaking strain 0.2%.The minimum cross section area of he rd in m^2 in order to support a load of 10^4N is if young's modulus is 7*10^9 N/m^2 ans: 1.) 7.1*10^-4
  76. physics

    calculate the acceleration of 2kg block on a horizontial friction-free air table when you exert a horizontal net force of 20N.
  77. Physics Help

    An electron with velocity v = 2.4 × 106 m/s i encounters an electric field E = 1250 N/C i. How long will it take for the speed to be one fourth its original value?
  78. Physics

    How would you use a concave mirror of radius of convatrue 18cm to give a four time magnified erect image of an object?
  79. Physics

    How would you use a concave mirror of radius of convatrue 18cm to give a four time magnified erect image of an object?
  80. physics

    a small conducted sphere is attached to the end of an insulating rod .it carries a charge of +5.0*10-9 C. the plates ,which are 4.0 cm apart, are connected to a 50 000 V supply.
  81. physics

    If 4.5 kg object is sitting at rest on a 30 degree incline that has a coefficient of static friction of .19, what is the net force down the plane? Does it start sliding?
  82. physics

    Sam tosses a ball horizontally off a footbridge at 4.8 m/s. How much time passes after he releases it until its speed doubles?
  83. Physics

    A 3.0 kg block slides down a 4.5 m ramp of angle 30 degrees and collides inelastically with a 4.5 kg bolck at rest. Calculate the velocity after the collision.
  84. physics

    How many revolutions per minute would a 15 -diameter Ferris wheel need to make for the passengers to feel "weightless" at the topmost point?
  85. physics

    A 445 g sample of ice at -58CENTIGRADE iS HEated until its temparature reaches -29 centigrade.find the change in heat contend of the system.
  86. Physics

    an airplane is flying in a horizontal of radius 1.0 km what must be the speed of the plane if the pilot is to experience a centripetal acceleration three times that of gravity.
  87. Physics

    A construction worker exerts 209N to move a load of bricks a distance of 10m across the parking lot,how much work does he do?
  88. Physics

    A construction worker exerts 209N to move a load of bricks a distance of 10m across the parking lot,how much work does he do?
  89. physics

    Two masses of 8 kg and 12 kg are tied to each end f a string passing over a massless and frictionless pulley. find the resulting accelration of each mass.
  90. Physics

    A small block of mass m slides along the frictionless loop track,if it starts from rest at point p,what us the resultant force acting on it at q?
  91. Physics

    Joe stands 150 m from the edge of a canyon wall. How long will it take him to hear his echo if the air temperature is 250 degree C?
  92. Physics

    A magnetic field increases from 0 to 0.09 T in 3.0 s. How many turns of wire are needed in a circular coil 20 cm in diameter to produce an induced emf of 7.5 V? Please help soon.
  93. Physics

    In grandpa’s time automobiles were previously manufactured to be as rigid as possible, whereas autos are now designed to crumple upon impact. Why?
  94. physics

    a cyclist moving with constant speed 10m/s develop a power of 400 watt. Calculate the average force exerting on the bicycle
  95. Physics

    a particle moving with a acceleration travels 24m and 64m in the first two consecutive intervals of 4 seconds each.find its initial velocity
  96. physics

    A uniform sheet of surface current density Ks=Ky ay in z=0 plane. find the magnetic field strength H everywhere using ampere's law.
  97. 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!!!
  98. 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?
  99. physics

    How long does it take a plane, traveling at a constant speed of 166 m/s, to fly once around a circle whose radius is 4000 m?
  100. physics

    find the equilibrium of two is N forces acting upon a body,when the angle betweenthem is a)90degrees b)120degrees c)180degrees d)10degrees e)45degrees
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