Physics!

74,459 results, page 100

  1. physics

    Why we use square root of density in Grahms law instead of simpl density?
  2. physics

    an airplane rolls down the runaway. compared to which reference point is the airplane in motion?
  3. physics

    Forces of 8.85 N and 2.21 N act at right angles on a stack. What is the mass of the stack if it accelerates at a rate of 4.4 m/s^2?
  4. Physics

    A circular ring of radius 10 cm has a continuous charge distribution of 4C/m . How many total electrons are on the ring?
  5. Physics

    Use the equation for acceleration to determine the acceleration for the following motion. Time(s) 0 1 2 3 4 Velocity(m/s) 0 2 4 6 8
  6. physics

    n object is dropped from rest. What is the acceleration after 6 s? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m/
  7. physics

    An electron floats at rest above a sheet of charge with uniform charge density x. What is x in C/m^2
  8. physics

    If my kinetic coefficient and static coefficient are both 1.02, how can I explain why they are the same???? (For a horizontal surface)
  9. Physics

    At 1:00 p.m. a car, traveling at a constant velocity of 80 km/h toward the west, is 31 km to the west of our school.
  10. Physics

    A 0.40 g fruit in a tree has a gravitational potential energy of 200 J. How high from the ground is the fruit?
  11. physics

    A 2.0 kg rock is dropped from the top of a building. I lands 14.0 seconds later. How tall was the building?
  12. Physics 221

    What is the magnitude and direction of the electric field at a point 0.75 m away from a point charge of +2.0 pC?
  13. physics

    two forces 5N and 7N act on an object respectively.When will the resultant of the two vectors be at a maximum?
  14. Physics

    What affect does changing the mass of an object on a ramp have on the efficiency of the ramp? Explain.
  15. physics

    A man walks 10km due south. The displacement of the man from the initial position is
  16. Physics

    A penny is dropped from a 50 m high bridge, how fast was the penny moving when it hit the water?
  17. Physics

    A penny is dropped from a 50 m high bridge, how fast was the penny moving when it hit the water?
  18. Physics

    A car experiences a constant acceleration of 2.3 m/s2. How long does it take (in s) for the car's speed to increase from 6.6 m/s to 17.9 m/s?
  19. Physics

    On an unknown planet, a pendulum of length 1.5 m swings with a period of 3.3 s. What is the acceleration of gravity on this planet?
  20. physics

    he x-component of a velocity vector that has an angle of 44∘ to the +x-axis has a magnitude of 4.3m/s . What is the magnetude velocity?
  21. Physics

    A boat takes 2.0hr {\rm hr} to travel 26km {\rm km} down a river, then 6.0hr {\rm hr} to return.
  22. Physics

    A boat takes 2.0hr {\rm hr} to travel 26km {\rm km} down a river, then 6.0hr {\rm hr} to return.
  23. Physics 2

    An antenna is connected to a car battery. Will the antenna emit electromagnetic radiation? Why or why not? Explain
  24. physics

    The charge carried by one electron is e = -1.6 × 10-19 C. The number of electrons necessary to produce a charge of -1.0 C is:
  25. physics

    A coin is dropped from a height of 40 meters. How fast is the coin traveling after 3 seconds?
  26. physics

    what is the magnetic flux of a magnetic field of 3.5 x 10 T lassing a given circular surface with radius 30 cm
  27. physics

    a ball is dropped from the top on an 80-m high building. what speed does the ball have in falling 3.5 s?
  28. Physics

    What element results if two protons and two neutrons are ejected from a radium nucleus?
  29. Physics

    what will be the final temp of 500g of 21c waterbullets are dropped in? when 500g of 324c lead
  30. physics

    When heat transfers into a system, is the energy stored as heat? Explain briefly.
  31. physics

    In a typical electron microscope, the momentum of each electron is about 1.4 10-22 kg-m/s. What is the de Broglie wavelength of the electrons?
  32. Physics

    A certain planet is located 3.54 x 10^11 m from its sun. If its orbital period is 4.9 x 10^7 s, find the mass of its sun.
  33. Physics

    A certain planet is located 3.54 x 10^11 m from its sun. If its orbital period is 4.9 x 10^7 s, find the mass of its sun.
  34. Physics

    A certain planet is located 3.54 x 10^11 m from its sun. If its orbital period is 4.9 x 10^7 s, find the mass of its sun.
  35. physics

    A steel sphere of radius 6.5 mm is dropped into a lake. What is the terminal speed of the sphere?
  36. Physics

    A steel sphere of radius 6.5 mm is dropped into a lake. What is the terminal speed of the sphere?
  37. physics

    A steel sphere of radius 6.5 mm is dropped into a lake. What is the terminal speed of the sphere?
  38. PHYSICS PLEASE HELP QUICKLY

    Multiple choice please help :) Which of the following is equivalent to one ampere? 10 s/10 C 10 C/10 m 1.5 C/1.5 s 15 C/10 s
  39. Physics

    What is the centre of mass if the mass of the earth is 81 times that of the moon and the distance between them is 384 Mm=60 rj ?
  40. physics

    A car with a mass of 2,000 kg has a kinetic energy of 900,000 J. How fast is it traveling?
  41. physics

    An astronaut on Triton throws a 0.142 kg baseball straight up with a velocity of 24 m/s. How high does the baseball go?
  42. Physics

    3) What is the emf of a battery with an internal resistance of 0.15 if the battery delivers 1.5 A to an externally connected 5.0 resistors?
  43. Physics

    why does the temperature of boiling water remain the same as long as the heating and boiling continue?
  44. Physics 2

    State Lenz’s law and explain Briefly explain the operation of an electric generator
  45. physics

    A snail moved 0.14 m between two cabbages in 3.0 minutes. The average speed of the snail is
  46. physics

    how many litres of 15%(mass/volume)sugar solution would it take to get 75g of sugar?
  47. Sociology

    Which of the following was a topic of study in early sociology? a. Astrology b. Economics c. Physics d. History
  48. Physics

    A car slows from 23 m/s to 3.4 m/s at a constant rate of 2.1 m/s2. How many seconds are required before the car is traveling at 3.4 m/s?
  49. physics

    The position of a particle as it moves along the x axis is given by x = 15eƒ{2t m, where t is in s. What is the acceleration of the particle at t = 1.0 s? 4.
  50. physics

    A certain circuit breaker trips when the rms current is 50.0 A. What is the corresponding peak current?
  51. Physics

    An electron has an initial speed of 2.24 × 10^5 m/s. If it undergoes an acceleration of 2.2 × 10^14 m/s^2, how long will it take to reach a speed of 5.37 × 10^5 m/s
  52. physics

    The resistivity of copper is 1.3×10^-9 ohms. What is the length of a wire whose resistance is 0.25 ohms, diameter 10^-8 m.
  53. physics

    If a ball hits a wall going 10 m/s, and bounces off going 7 m/s. What is the coefficient of restitution?
  54. Physics

    Two light bulbs of resistance R1 and R2 (>R1) are connected in a series. Which is brighter? What if they are connected in parallel?
  55. physics

    In 10 seconds a car accelerates 3m/s^2 to 90m/s. How fast was the car going before it accelerated?
  56. physics

    Forces of 8.85 N and 2.21 N act at right angles on a stack. What is the mass of the stack if it accelerates at a rate of 4.4 m/s^2?
  57. physics

    A bicycle tire rotates at 30 radians/s. If the bicyclist travels at 10m/s, what is the diameter of the tire?
  58. physics

    a net force of 72 n is applied to a 48 kg box starting from rest for 8 s. what is the final velocity of the box?
  59. Physics

    Does potential energy equal to kinetic energy within the limits of experimental error?
  60. Physics

    The initial speed of a body is 3.01 m/s. What is its speed after 3.89 s if it accelerates uniformly at 3.63 m/s 2 ? Answer in units of m/s
  61. physics

    a 0.12 kg is sitting on a record with a diameter of 0.30 meters. the record completes one turn on 0.40 seconds
  62. physics

    a 0.12 kg is sitting on a record with a diameter of 0.30 meters. the record completes one turn on 0.40 seconds
  63. Physics

    What is the horizontal component of the force of an object sloped at a 45° angle. pulling with a force of 110N.
  64. physics

    Calculate the potential energy of a 9.00 g bullet traveling 4.00 m above the ground at 50.0 m/s with respect to the ground
  65. physics

    The initial speed of a body is 6.64 m/s. What is its speed after 1.38 s if it accelerates uniformly at 4.7 m/s 2 ? Answer in units of m/s
  66. physics

    a force of 10n cause a spring to extened by 20 mm find? the extension of the spring when 25n is applied
  67. physics

    if the radius from the discus to the axis of rotation is 1.4m, what is the linear velocity of the discus at the time of release?
  68. Physics~

    The moon's gravity is one-sixth that of the earth. What is the period of a 0.25 m long pendulum on the moon?
  69. physics

    5000J of heat is supplied to 10kg of water at 30degrees. What will be the water's final temperature
  70. Physics

    Why do citizens have a responsibility to have some basic understanding of nature's rules?
  71. mathematics,science,physics,agriculture and geograph.

    which work i surpose to do?caus geograph confuse me!
  72. physics

    the brakes of a car provide an acceleration of -5.0 m/s^2 . how long will it take for a car traveling at 20.0 m/s to stop ?
  73. physics

    Suppose that you balance a 5 kg ball on the tip of your finger that has an area of 1 cm2. What is the pressure on your finger?
  74. physics

    A canoe has a velocity of 0.31m/s southeast relative to the earth. The canoe is on a river that is flowing
  75. Physics

    Two forces of 5N and 7N respectively act on an object,When will the resultand of the two vectors be at max?
  76. physics

    A 200-kg rock is being pulled upward with an acceleration of 3 m/s2. The net force on the rock is
  77. physics

    A 2011 kg elevator moves with an upward acceleration of 1.9 m/s2. What is the tension in the cable that supports the elevator?
  78. physics

    what is the electric force exerted on a test charge of 3.86 x 10^-5 C if it is placed in an electric field of magnitude 1.75 x 10^4 N/C ?
  79. physics

    What average force is required to stop a 920kg car in 7.7s if the car is traveling at 83km/h ?
  80. physics

    a pendulum is 0.75 meters long and has a period of 4.17seconds is this pendulum on the earth moon or mars?
  81. Physics

    A car that slows down uniformly from 20 m/s to 5 m/s has an impulse of 30,000 kg m/s. Determine the mass of the car
  82. Physics

    Carl hits a 0.05 kg golf ball giving it a speed of 65 m/s. What impulse does he impact to the ball?
  83. physics

    At what force would a 16k object travelling at 25mph hit a stationery object
  84. Physics

    Carl hits a 0.05 kg golf ball giving it a speed of 65 m/s. What impulse does he impact to the ball?
  85. Physics

    A 65 kg sprinter completes a 100 m race in 9.83 s. Calculate the average kinetic energy of the sprinter.
  86. Physics

    an object falls from a 3m height what is the speed of the object just before it touches the ground?
  87. Physics

    What is the focal length of a lens that has a center of curvature of 18 meters from one of the curves of the lens?
  88. PHYSICS

    Find the mass of water that vaporizes when 4.04 kg of mercury at 210 °C is added to 0.498 kg of water at 81.6 °C.
  89. PHYSICS

    Find the mass of water that vaporizes when 4.04 kg of mercury at 210 °C is added to 0.498 kg of water at 81.6 °C.
  90. Physics

    Vectors A and B are added to produce C, that is A+B=C. If B=-5x+5y and C=2x-3y. Find the unit vector of A, that is find A (in component form).
  91. physics

    a man goes 10m towards north,then 20m towards east then displacement is what
  92. physics

    what acceleration is imported to a football when the player kicked it with a force of 25 N mass of football 0.40kg
  93. Physics

    if the distance and height of a track increase, does the car's accepted velocity and acceleration increase?
  94. experiment physics

    experiment vector and addition. is it necessary to label the first load ? explain
  95. Physics

    A 100 kg load is lowered by means of a cable with a downward acceleration of 5.0 m/s^2. What is the tension in the cable?
  96. Physics

    Leila walks south for 20m and then west for 20m. What is her resultant displacement graphically?
  97. Physics

    A body falls freely from rest for a 6sec find the distance traveled in the last 6sec.
  98. Physics

    A ball is dropped from rest and takes 0.43 s to fall to the floor. At what height was the ball released?
  99. physics

    When a car moves up an incline, does the kinetic energy and potential energy decrease or increase?
  100. Physics

    A ball is tossed straight up into the air with a velocity of 37 m/s. What is its velocity at the top of its flight?
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