physics please HELP !

74,851 results, page 66
  1. physics

    calculate the energy evolved when 8 droplets of water of radius 1/2mm each combine into one. where S=0.072N/m
  2. Physics

    Find the pressure exerted by a waterbed with dimensions of 2m x 2m which is 30 cm thick. (hint:use density of water)
  3. physics

    A stone is thrown straight up. To reach a height of 6.74 m above its release point, what must its initial speed be in m/s
  4. Physics

    Find the electric potential at the centre of the square of side 1m at the four corners of charges of q1, q2,q3,and q4 are placed having values 3×10^-8C,-3×10^-8C,-5×10^-8C and 6×10^-8C respectively.
  5. Physics

    Calculate the length of a displaced pendulum Bob which pass through its lowest point twice every second. Take g=10m/s²
  6. 11th grade Physics

    What resistance would produce a current of 120 amps from a 6-volt battery?
  7. Physics

    A 1250 kg car travelling at 60.0 km/h comes to a sudden stop in 35 m. What is the coefficient of friction acting on the brakes?
  8. Physics

    calculate pressure in each foot?elephant 3200kg covers in each its feet an area equal 0.08(ms)
  9. Physics

    What is the gravitational force between two identical 4,500 kg asteroids whose centers of mass are separated by 120 m?
  10. Physics

    Displacement is to distance as velocity is to: a. acceleration b. mass. c. speed. d. time I chose C....is this correct?
  11. 11th grade Physics

    What voltage is necessary to produce a current of 200 amperes through a resistance of 1 x 10^-3 ohms?
  12. physics

    calculate the energy evolved when 8 droplets of water of radius 1/2mm each combine into one. where s=0.072N/m.
  13. physics

    Consider two charges, where one (+1.90 nC) is at the origin and the other (-3.61 nC) is at the position x = 4.35 cm. Find the x-coordinate where a proton would experience zero net force.
  14. physics

    A car going at 30 m/s undergoes an acceleration of 2m/s squared for 4 seconds. What is it's final speed? How far did it travel while it was accelerating?
  15. physics

    Consider the motion of the tip of the minute hand of a clock. In one hour, the displacement and average velocity is .......
  16. Physics

    How much momentum does a .01 kg ping pong ball have if it is traveling at 25 miles/hour? (1.609km=1 mile)
  17. PHYSICS DUE SOON

    A 95.1-g ice cube is initially at 0.0°C. (b) What is the change in entropy of the environment in this process? ___________J/kg
  18. Physics

    A 2.73 kg particle has a velocity of vx = 6.02 m/s and vy = 0.316 m/s. Find the magnitude of its total momentum. Answer in units of kg · m/s
  19. Physics

    Suppose that you want to take a photograph of yourself as you look at your image in a flat mirror 1.6 away. For what distance should the camera lens be focused?
  20. physics

    How fast (in ) must a centrifuge rotate if a particle 8.00 from the axis of rotation is to experience an acceleration of 117000 's?
  21. physics

    It two objects are thrown off a tall building and one is three times the mass of the other, do they hit the ground at the same time?
  22. physics

    damon,reiny,steve,ms sue.plz get a solution 2 my question please itz urgent!!!
  23. physics

    What is the power delivered by a motor lifting an elevator weighing 1250kg up 89 floors at 16.8 meters per second
  24. physics

    If I threw a ball vertically at an initial speed of 34.5 m/s, how many seconds would it take to reach its maximum height?
  25. Physics

    You swing a 2.40kg stone in a circle, using the full length of a thin 60.0cm rope.
  26. physics

    if some of water in calorimeter splash out when tranfering the metal block, will it affect the experiment result?
  27. Integrated Physics and Chemistry

    What are a few of the positive things the Equal Rights Amendment would have done for women in America?
  28. Physics

    If 2.4 m3 of a gas initially at STP is compressed to 1.6 m3 and its temperature raised to 30oC, what is the final pressure?
  29. Physics

    What is the gravitational force between a proton and an electron in a hydrogen atom if they are separated by distance of 5.29x10^-9 cm.
  30. physics

    How will the weight of a 20kg object change if it was in a lift that accelerates downward at 4 meters per second squared?
  31. physics

    find the change n momentum of a 1120-kg car that increases its speed / what minimum force is need to do this?
  32. physics

    light from the sun travels 1.5x10km to reach the earth .how long does it journey take in minutes?
  33. physics

    when two lenses of focal length +10cm and -5cm are placed in contact then find the net power ?
  34. Physics/ optics

    An object is located 25cm in front of a +6.00 lens, where is the image? is it real or virtual?
  35. Physics

    Determine Centripetal Acceleration acting on the person standing at the equator? (the radius of earth is given)
  36. physics

    if a todler is moving at 15m/s and covering a distance of 1900m. how much time does it take to cover this distnace?
  37. physics

    a rolling ball covers a distance of 650m in 20 min. its speed in kilometer per hour will be what?
  38. physics

    if a todler is moving at 15m/s and covering a distance of 1900m. how much time does it take to cover this distnace?
  39. physics

    if a todler is moving at 15m/s and covering a distance of 1900m. how much time does it take to cover this distnace?
  40. physics

    How can the equation be prove:maximum height,time of flight and maximun range in projectile?
  41. Physics

    An ideal gas performs 453 of work and loses 45J of internal energy
  42. physics

    List four effects that can be observed that demonstrate light travels in straight lines. Does anybody know the answer??
  43. physics

    A 6.0 Kg object undergoes an acceleration of 2.o m/s squared. what is the magnitude of the net external force acting on it?
  44. Physics

    A Brass rod 50.0 cm long expands 0.0734 cm when heated. Find the temperature change.
  45. Physics

    a boat sails 150km N60°E, then 100km West. What is it's displacement from its starting point?
  46. Physics

    Calculate the resistance of a 900 watt toaster operating at 120 volts. Which formula do you use?
  47. Physics

    What is the gravitational force between a proton and an electron in a hydrogen atom if they are separated by a distance of 5.29x10^-9 cm
  48. physics

    What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 10.5 m/s when going down a slope for 3.18 s?
  49. Physics

    A boy sledding down a hill accelerates at 1.70 m/s2. If he started from rest, in what distance would he reach a speed of 7.40 m/s?
  50. Physics

    In the Theory of Special Relativity, the momentum of a massless particle is equal to which of the following? A. m0c^2 B. E2c^2 C. E/c D. E/c^2
  51. physics

    A car comes to rest uniform deceleration at the rate of 5.8 m/s2 for 14.3 seconds. What is distance did it travel during this time??
  52. physics

    Does the following represent a sample or a population? calories created while burning all of the coal taken from a rail car
  53. physics

    At highway speeds, a particular automobile is capable of an acceleration of about 1.6 m/s2. At this rate, how long does it take to accelerate from 81 km/h to 107 km/h?
  54. 11th grade Physics

    What happens when an insulator is wired in parallel with the bulb? is the swich open or closed?
  55. physics

    What frequency would you need to produce a sound wave in room-temperature air with a wavelength of 9 m? the answer in Hz
  56. Physics

    Two negatively-charged bodies with -5.4e-5 C are 0.20 m from each other. What force acts on each particle? F=kqq/d^2 F=(9.0e9)(q)(q)/(.20^2) Would both q's equal -5.4e-5 C?
  57. Physics

    determine the image distance for an object that is 45.0 cm from a double convex lens having a focal length of 15.0 cm
  58. physics

    A box is pushed without acceleration 9.0m along a horizontal floor against a frictional force of 100N. How much work is done?
  59. Physics

    What is the efficiency of a crane that used current of 8A at 150V to raise 450kg load at the rate of every minutes?
  60. Physics - Magnetism

    The direction of magnetic lines of force change if an iron piece is placed in its field. Why?
  61. physics

    Is the acceleration due to gravity more or less atop Mt. Everest than at sea level? Defend your answer.
  62. physics

    a car is moving at 17.7 m/s when it begins to slow down with a deceleration of 2.5 m/s2. how long does it take to travel 20 meters as it slows down
  63. physics

    What is the magnitude of the momentum of a car weighing 1,555 N when it is moving at a speed of 23 m/s? Express your answer in kg m/s.
  64. physics

    A car traveling at 70 km/h. It then accelerates at 3.6m/s^2 to 90km/h. How long does it take to reach a new speed. How far does it travel during acceleration
  65. physics

    if the direction of a magnetic field around a straight wire is counterlcockwise, which direciton is the current traveling?
  66. physics

    Resultant displacement from 12m east to5m north to9m vertically upward
  67. college physics

    Is it possible for a frictional force to increase the mechanical energy of a system? If so, give examples.
  68. Physics

    6. If your boat weighs 1200 N, how much water will it displace when it’s floating motionless at the surface of the lake?
  69. Physics

    If a man weighs 900 N on the earth, what would he weigh on jupiter, where acceleration due to gravity is 25.9 m/s^2?
  70. Physics

    In a hydrogen atom, if the radius of the orbit of the electron is doubled, then its energy will ... >> Increase by a factor of 2??
  71. Physics

    In the Theory of Special Relativity, the momentum of a massless particle is equal to which of the following? A. m0c^2 B. E2c^2 C. E/c D. E/c^2
  72. physics

    For an object in equilibrium the sum of the torques acting on it vanishes only if each torque is calculated based on your:
  73. PHYSICS ROLLING MOTION!!!

    A unicycle with a tire 44.0 cm in diameter travels 2.00 km. How many revolutions does the wheel make?
  74. applied physics

    Calculate the magnitude of the torque produced by two 25N forces that are 3m apart and in opposite directions
  75. Physics

    If a bullet was fired straight up at a speed of 30 m/s, what would be the total time for it to return to its starting point?
  76. physics

    what is the force in newtons acting on a 4.0kg package of nails that falls off a roof and is on its way to the ground
  77. Physics

    A,B,C,D are four charges placed at each corner of a square, with A= -6.00 mC , B=6.00 mC, C=-6.00 mC and D=6.00 mC.ALso AB=BC=CD=DA=0.100 m.Determine the magnitude and direction of force on each charge.
  78. physics

    How much potential energy does DeAnna with a mass 62.0 kg, gain when he climbs a gymnasium rope a distance of 3.5 m?
  79. physics

    A particle is projected with a speed of 39.2m/sec at an elevation of 30degrees.find its greatest height.
  80. physics

    You throw a ball upward from a window at a speed of 2.9 m/s. How fast will it be moving when it hits the sidewalk 2.2 m below?
  81. Physics

    A boy sledding down a hill accelerates at 1.25 m/s2. If he started from rest, in what distance would he reach a speed of 5.00 m/s?
  82. Physics

    What potential energy does a 60.0-kg gymnast acquire in climbing 5.00 m up a vertical pole? GIVEN: mg = 60 h/d = 5.00 m PE = mgh PE = (60)(5.00) PE = 300 J
  83. physics/science

    i don't understand why radioactive waste is stored underground is it because it is a harmful substance
  84. Physics

    A 2.0-kg rock falls from a height of 25 m to a point 20 m above the ground. How much potential energy does it lose? GIVEN: mg = 2.0 kg h/d = 5 m PE = mgh PE = (2)(5) PE = 10 J
  85. physics

    show the expression v=at is dimensionally correct where v represents speed an acceleration and t is instant time?
  86. physics

    what net force is needed to accelerate a 2.0kg mass from rest to a velocity of 10m/s in 5.0s
  87. Physics

    If the Kitty Hawk Flyer has 12 HP how would you express this power in the SI system and report the numerical value in kilowatts?
  88. maths lit,physics,life science n tourism

    i don't know which career to choose can you help me ?I'm doing grade 11.
  89. Physics- 8th Grade

    What force is needed to accelerate a 10 kilogram shopping cart 3 m/s^2 (squared)?
  90. physics

    How high will an object rise if it is projected upward at a 45 degree angle and an initial velocity of 50 m/s?
  91. Physics II

    find the pressure at the bottom of a vessel 76cm deep when filled with a) water b)mercury (sp.g. 13.6)
  92. physics

    How high will an object rise if it is projected upward at a 45 degree angle and an initial velocity of 50 m/s?
  93. physics

    If you cover your home thermostat with a blanket, will it make the house hotter or colder, or have some other effect?
  94. physics

    What force is necessary to keep a 2.00x10^3 car moving up a 15.0 degree incline at a constant velocity? (Mu=.200)
  95. physics

    Show that the acceleration is 7.5 m/s2 for a ball that starts from rest and rolls down a ramp and gains a speed of 30 m/s in 4 s
  96. physics

    how high a building can superman jump over if he is to leave the ground with a velocity of 60 m/s at an angle of 75 degrees
  97. Physics

    How much work is done by a girl weighing 450N while carrying a 2kg package up a 2m flight of stairs?
  98. physics

    Two stones one at equator and the other at poles are allowed to fall from same height and at same time.which one will strike the ground first?
  99. physics

    vector b has x,y, and z components of 4.0, 6.0, and 3.0 units, respectively. Calculate the magnitude of b and the angles that b makes with the coordinate axes.
  100. Physics

    An airplane lands and starts down the runway at a southwest velocity of 41 m/s. What constant acceleration allows it to come to a stop in 1.3 km?