physics please HELP !

74,641 results, page 81

  1. 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?
  2. Physics

    I have a rubber ball. Its diameter is 5.16 cm. Its density is 1.5 Mg/m^3. I need to find its weight in US units. I know to use w=pVg I am coming out with the wrong answer though. Can someone help?
  3. physics

    what r the 4 forces on a plane whilst in flight?, im confused, i don't no whether it means like air resistance....or thrust.maybe u cud help me out :S
  4. 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)
  5. Physics

    What is the upper tripper point (UTP) of a comparator with hysteresis if R1 = 47 kÙ, R2 = 68 kÙ and the maximum positive output voltage is 10V?
  6. 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.
  7. Physics

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

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

    All, Please just help me in this, I will need you to please give me the clue-thanks. a flashlamp bulb is marked '2.5V,0.30A' and has to be operated from a dry battery of e.m.f 3.0V for the current p.d. of 2.5V to be produced across it. Why?
  10. physics

    Find the distance by which a 42cm diameter, 9.4m tall concrete column is compressed when it supports a 12900kg load
  11. 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
  12. Physics

    About how much pressure do the feet of a 6000-kg elephant exert on the ground? Assume each foot has area of 0.10 square meters.
  13. 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.
  14. physics

    A pendulum has a mass of 3-kg, a length of 2 meters and swings through a (half)arc of 27.3 degrees. What is its Amplitude to the nearest centimeter ?
  15. Physics

    Ivan rides his motorcycle 4.5 times around a circular track that has a radius of 100 m a)what is the distance traveled and b)what is the displacement?
  16. 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?
  17. Physics

    If you were to jump from an airplane at an altitude of 15000 ft. and fall toward the Earth at 100 mph how long would it take to reach the surface?
  18. Physics for Life science

    1.Since action and reaction are exactly equal and oppositely directed, how is ever possible for a net force to be acting on the body?
  19. physics for life sciences

    since action and reaction are exactly equal and oppositely directed how is it ever possible for a net force to be acting on a body?
  20. 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)
  21. Physics

    Touching a Van de graff generator and slowly moves away from the dome why he touches it again he recives a stron shock why ?
  22. Physics

    What force is required to accelerate an object of 1.484x10^0 kg over a frictionless surface at -2.3580x10^0 m/s2 expressed to three significant figures.
  23. physics

    A quarterback threw a football at 27 m/s at a certain angle above the horizontal. If it took the ball 3.3 s to reach the top of its path, how long was it in the air? s
  24. 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?
  25. physics

    The pendulum swings past the pole 14 times in 21 seconds. The weight of the bob is 10g. Calculate the period?
  26. Physics

    What is the max speed a car can go on a race track with a radius of 80 meters, the coefficient of friction between the tires and the road is .30
  27. Physics

    An airplane is flying horizontally 100m above the ground at 50.0 m/s. Ignoring air resistance, how far before the target should an object be dropped?
  28. Physics 1

    A 1400 kg car traveling at a speed of 34 m/s skids to a halt on wet concrete where μk = 0.50. How long are the skid marks?
  29. Physics

    Calculate the skid_to_stop distance of a car traveling on a road at 100 kilometers per hour with a coefficient of friction of 0.68...
  30. physics

    If we wanted a block of iron of mass 3.25 kg to acquire a positive charge of 0.100 C, what fraction of the electrons would we have to remove?
  31. physics

    what is the magnitude kinetic frictional force between a 1500 kg car decelerating at a rate of 5.0m/s^2 skidding across a horizontal road.
  32. 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,

    How much does it cost to operate a 100 W lamp continuously for 1 week if the power utility rate is 8/kWh? answer in $
  34. physics

    A woman with a mass of 65kg climbs a set of stairs that are 3m high. How much gravitational potential energy does she gain? Thank you.
  35. Physics

    A projectile is fired straight up at a speed of 13 m/s. How long does it take to reach the top of its motion? The acceleration due to gravity is 9.8 m/s2 .

    If a trapeze artist rotates twice each second while sailing through the air, and contracts to reduce her rotational inertia to one-third, how many rotations per second will result?
  37. 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?
  38. physics

    A moto of a crane is lifting a 100 kg load 20m high using 25 kj of electrical energy. calculate the efficiency
  39. 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?
  40. Physics

    A person weighing 900 Newtons is standing on snowshoes. Each snowshoe has an area of 2500cm^2. What is the pressure on the snow?
  41. 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

    The weight of a hollow sphere is 100N.If it floats in water just fully submerged,what is the exterrnal diameter of the shere ?
  43. physics

    a circuit consist of an inductance of 0.05H, a resistance of 20ohms , a capacitor of 100uF and an angle of 100cos200t. find (i) and (q) given that q=0,and i=0 at t=0.
  44. physics

    The pulley in Figure P8.59 has a moment of inertia of 7.0 kg·m2 and a radius of 0.50 m. The cord supporting the masses m1 and m2 does not slip, and the axle is frictionless.
  45. physics

    Calculate the density of an object with a mass of 109 grams and a volume of 123 ml. (Round your answer to 3 digits.)
  46. 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.
  47. 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..??
  48. physics

    the work function of zinc is 3.6ev what is maximum enegy photoelectron by ultraviolet wave of light 3000angstrome
  49. 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?
  50. physics

    Calculate the pressure exerted on the floor by the heel if it has an area of 1.45 cm2 and the woman's mass is 58.0 kg. Express the force in N/m2 and lb/in
  51. 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?
  52. 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 ?
  53. physics

    016 (part 1 of 2) 10.0 points A speedboat increases in speed from 17.9 m/s to 31.8 m/s in a distance 188 m. Find the magnitude of its acceleration.
  54. physics repost

    A 1.00-kg ball is attached to a string of 0.50 m and swung in a horizontal circle with a velocity of 2.00 m/s. Find the centripetal acceleration. ac=v^2/r = 2.00^2/.50 = 8.0 m/s^2
  55. physics

    Find the time it would have taken a horse to run: displacement: +1609 m average acceleration: +0.0105 m/s^2 initial velocity: +16.58 m/s
  56. Physics

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

    How fast must a cetrifuge rotate in order for a particle 9cm from the axis of rotation to experience an acceleration of 115000g's
  58. 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?
  59. Physics

    An electric filament can heat 200 cm^3 of water from 5°C to 95°C in 6 minutes. If the voltage source is a 12 V battery, how much current does it draw?
  60. Physics

    A 60-kg person begins to accelerate upwards on an elevator at a rate of 3 m/s^2. What does the scale read at this time? My answer: 768 N
  61. 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?
  62. physics

    A stretched string of length 168 cm vibrates in its nth mode. The separation distance from node to antinode is 21 cm . What is the value of n?
  63. 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?
  64. physics

    During an Olympic bobsled run, the Jamaican team makes a turn of radius 7.9 m at a speed of 97.4 km/h. What is their accelaration in g-units?
  65. Physics

    Two bowling balls each have a mass of 6.8kg. the speres are located nest to one another with their centers 21.8 cm apart. what gravitational force do they exert on each other?
  66. Physics

    What would be the appearance of the speed-time curve if the fallng body where so light that the effect of air friction could not be neglected?
  67. college physics

    How fast (in rpm) must a centrifuge rotate if a particle 9.50 cm from the axis of rotation is to experience an acceleration of 113000 g's? Need help please.
  68. physics

    A wooden cube of side 10cm has mass 700g.What part of it remains above the water surface while floating?
  69. physics

    A transverse wave, frequency 15.0 Hz, travels along a string. Distance between a crest and an adjacent trough is 3.50m. What is its wavelength?
  70. 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?
  71. physics

    If Vx= 8.00 units and Vy= -6.40 unis, determine (a)the magnitude and (b)direction of ->V(vector) b) theta= ______ degrees below the positive x-axis.
  72. Physics

    An object is thrown directly up (positive direction) with a velocity (vo) of 20.0 m/s and do= 0. Determine how long it takes to get to the maximum height of 24.0 m.
  73. Physics

    What is the minimum work in joules needed to push a 1840 kg car 14.0 m up a 12.5 degree incline? (Ignore friction.)
  74. physics

    a car traveling in a straight line has a velcoity of 2.43 m/s at some instant. After 6.73 s, its velocity is 9.81 m/s. what is its average acceleration in this time interval?
  75. Physics

    What should the theoretical maximum value of the uniform acceleration of a object freely rolling down an inclined plane and what would the angle of elevation be?
  76. physics

    a car traveling in a straight line has a velcoity of 2.43 m/s at some instant. After 6.73 s, its velocity is 9.81 m/s. what is its average acceleration in this time interval?
  77. physics

    Simpson drives his car with an average velocity of 48.0 km/ to the east. How long will it take him to drive 144 km on a straight highway?
  78. Physics

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

    a uniform rod is 1m caring a weight of 100N calculate its tension of the string holding it an the reaction at the hinge
  80. physics

    A 4.3kg object moves across a floor with a velocity of + 8.2 m/s and slides to rest in 5.8 s. The net force producing this acceleration is:
  81. physics

    A car accelerates uniformly from rest to a speed of 24.3 km/h in 5.8 s. Find the distance it travels during this time. Answer in units of m
  82. Grade 11 Physics - Light Unit

    Why must rays be shone in the centre of a flat surface? Describe the difficulty that's results if this is not done.
  83. Physics

    A 0.5 kg air-hockey puck is initially at rest. What will its kinetic energy be after a net force of 0.8 N acts on it for a distance of 0.5 m?
  84. Colle physics

    For an object in uniform circular motion, on what parameters does the experimental determination of the centripetal force depend when using F = ma
  85. Physics

    A 185kg refrigerator is loaded into a van by moving it up a 10.0m long frictionless ramp that is at an angle of 11.0 degrees. How much work is done?
  86. Physics

    A 26-lb. force vector that makes an angle of 101° counterclockwise from the -y direction. Determine the x and y components of the following three vectors in the xy plane.
  87. Advanced Physics

    one kilogram is poured into a cylandrical vase and fills it to a depth of 8 cm. find the cross section of the cylander. how do i do this?
  88. physics

    If you push a box a distance of 2,000 meters with a force of 1 newton, how many Calories have you used? 1 Calorie= 4,187 Joules
  89. Physics

    the 8kg mass of an object moves in a distance of radius 10cm at 15m^2.calculate the angular velocity
  90. physics

    what change in velocity would be produced on a body of mass 4kg, if a contact force of 16N act on it for 2sec.
  91. physics

    A 0.2 kg sponge is dropped from rest , pulled down by gravity. How fast will it be traveling in 6.0s , if a 0.5 N force of air resistance acts on it
  92. physics

    A sharp image is located 83.0 mm behind a 62.0 mm focal-length converging lens. Find the object distance by calculation.
  93. Physics

    An object is thrown with speed of 17 m/s at an angle of 550. find the time it takes to reach its maximum height.
  94. physics

    explain the scientific method for dropping a penny from the empire state building to see if it will penetrate someones head below
  95. Physics

    calculate the following, expressing the answer in scientific notation with the correct number of significan figures: (8.86 + 1.0 * 10^-3) / 3.610 *10^-3 2454.57?
  96. Physics

    an object is pushed horizontally by a 0.0840-kiloN force over a frictionless table. find the resulting acceleration
  97. physics

    a car acclerate uniformly from rest andattains a speed of 40m/sin 10second itcoversa distanceof
  98. 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?
  99. 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?
  100. physics

    A stone of mass 5kg is thrown vertically upwards with velocity 10ms final calculate the height.
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