Physics!

74,730 results, page 48
  1. Physics

    If a 70g swimmer pushes off a pool wall with a force of250n, what is her acceleration?
  2. physics

    A drag racer accelerated from 0 to 475km/h in 4.88 s. Assuming a constant acceleration, how far did it travel?
  3. physics

    two point charge q1=50c , q2=10c are lactated at (-1,1,-3)m, and (3,1,0)m, respectivly. Find the force on q1.?
  4. physics

    A 32 kg girl runs up a flight of stairs that is 30 m high. How much work does this require? Not sure how to even start
  5. physics engg.

    A deutron is moving with a speed of 2*10^8m/s. Find the wavelength of the matter wave associated with it?
  6. Physics

    A fuel has heat of combustion equal to 30 kJ / g. How much energy is released when 5 kilograms are oxidized?
  7. PHYSICS

    How could you repair an electric fan that is not working properly? Apply scientific method.
  8. physics(measurement)

    What accurate method can be used to determine the thickness of a coin. Explain pls..
  9. physics

    a bullet is fired horizontally with a velocity of 40 m/s from a height if 50m. how far it will fall to the ground
  10. physics

    A force of 2 kg weight acts on a body of mass 4.9 kg .Find the acceleration produced.
  11. physics

    A force of 2 kg weight acts on a body of mass 4.9 kg .Find the acceleration produced.
  12. Physics

    If one used a stiff vertical spring rather than a regular one what would be the results? The gravitational PE and the Elastic PE would decrease. Am i right?
  13. Physics

    Why is parallel circuit brighter compared to series? ( Only one bulb is present in both circuits) Thanks :)
  14. physics

    What is the rotational speed of the minute hand on a clock? Convert from rad/s to rev/s
  15. Physics (HELP)

    The index of refraction of diamond is 2.42. What would be the speed of a light wave passing through a this medium? 8.1 x 10 ^-9 m/s 1.2 x 10^8 m/s 7.3 x 10^8 m/s 9 x 10^-9 m/s
  16. physics

    what force is necessary to stop a 20 g bullet moving at 200 m/s as it penetrates a wood at a distance of 4 m?
  17. physics

    What airspeed would a plane have to travel to have a groundspeed of 320 km/h [S] if there is a 50.0 km/h wind coming from the northwest?
  18. Physics

    At what speed must a 950 kg subcompact car be moving to have the same kinetic energy as a 3.2*10^4 kg truck going 20 km/h ?
  19. Physics

    A dog is running at 3.0 m/s for 3.6 km. How long did it take him to arrive at his destination? (Give answer in seconds)
  20. Physics

    Air in a balloon does 50 J of work while absorbing 70 J of heat.What is its change in internal energy?
  21. Physics

    The longest and shortests wavelengths of the Lyman series of singly ionized Helium
  22. physics

    a small pith ball carries a charge of -1.3 uc. how many excess electrons does this represent?
  23. physics (electric charges)

    Hi, How can you charge an electroscope negatively? Is it by using a positively charged rod? Can someone please help me? Thank you :)
  24. Physics

    A 3200kg helicopter must accelerate up at 1.0m/s^2. What minimum lift do the rotors need to produce? Thanks for answering!
  25. Physics

    The time at which it took the arrow to reach the bulls eye is .6 seconds and it will land 1.8m under the bullseye
  26. physics

    What are the factors that affect the quantity of heat needed to raise the temperature of a substance?
  27. PHYSICS/MATH

    What is your average power if you lift a 33.8 kg box at a constant speed to a height of 3.27 m in 6.10 s?
  28. physics

    a mass 3 kg is dropped from a 20m high stand how long does it take to reach the ground?
  29. physics

    Uranium 235 has 92 protons in its atoms. Calculate the number of neutrons in this atom
  30. Physics

    How would you change the following Galilean transformation equations in the case where a frame was moving both in the x and the y direction? (Use the following as necessary: x, y, z, Vx, Vy, t.) x' = y' = z' = t' =
  31. physics

    Calculate the coefficient of kinetic friction for tyre rubber on the road surface.
  32. Physics

    A truck covers 40.0 m in 9.40 s while smoothly slowing down to final speed 2.35 m/s. Find its accelerations
  33. Physics

    What is the image distance of a 4 cm tall object placed 40 cm from a concave mirror having a focal length of 10 cm? -13.3 cm 13.3 cm -40.0 cm 40.0 cm
  34. physics

    what has more inertia? a toy car going 1000mph or a cruise ship sitting at the dock
  35. Physics

    What is the magnification of a 4 cm tall object placed 40 cm from a concave mirror having a focal length of 10 cm? 0.33 -0.33 1.33 -1.33 I'm thinking B.
  36. physics

    A car has a velocity of 25m and accelerates uniformly to 45m/s in 10seconds.what is the acceleration?
  37. Physics

    An object is shot upwards, from the ground, with an initial velocity of 120 m/s. How high will it be after 4.0s?
  38. physics

    A person can jump to a height of 1.5m on surface of earth. Find the velocity with which he jumps.
  39. physics

    what force is required to make an object of mass 500g accelerate at 4m/s2 (sqaured) ?
  40. physics

    how long does a car with an acceleration of 2.0 m/s^2 take to go from 10m/s to 30m/s?and show the solution how do you get the answer.
  41. physics

    Why do car have head rest?your answer should include the word"force"and "velocity"
  42. physics

    Why do car have head rest?your answer should include the word"force"and "velocity"
  43. physics

    a mass 3 kg is dropped from a 20m high stand how long does it take to reach the ground?
  44. Physics

    what is the distance that a satellite must be from Earths surface if it's period of rotation is 1 day? I really not sure where to even start..
  45. physics

    When you stand 200 meters away from a 30 meter tall tree, what angle should it take up on the horizon?
  46. Physics

    Calculate the Magnitude of the resultant of a pair of 100-km/h velocity vectors that are at right angles to each other.
  47. physics

    how much torque do you exert if you push perpendicularly on a door with a force of 30 N at a distance of 0.85 m from its hinges
  48. physics

    What is the initial angle 0f projection of a projectile for which the range and the maximum height are equal?
  49. physics

    If a spring is compressed 2.0 cm from its equilibrium position and the ncompressed an addition 4.0 cm, how much more work is done in the second compression than in the first?
  50. physics

    State how the centripetal force is provided in the case of a satelite orbiting the earth
  51. physics

    using ideas of torque and center of gravity explain why a ball rolls down a hill
  52. Physics

    The speed of a train increased from 20 mi/hr to 30 mi/hr in a distance of 500 ft. Calculate the average acceleration in ft/s2
  53. physics

    Why does cross sectional area of a liquid stream reduces while falling vertically??
  54. physics

    The equation y=5sin(3x-4)where y is in millimeters x is in metres and t is in seconds,represents a wave motion
  55. Physics

    A 1.25kg book in space has a weight of 8.35N. What is the value of the gravitational field at that location ?
  56. Physics

    A standing wave has wavenumber 200 rad/m. What is the distance between two adjacent nodes.
  57. physics

    how much heat is required to change 400g of ice at -20c into steam at 120c
  58. physics

    Calculate the amount work done on 60 N of force is used to move an object a distance of 4.0 meters
  59. physics

    A hockey puck has no friction on it. It has a mass of 0.28 kg and experiences a force of 48 newtons. What is its acceleration?
  60. physics

    distance a cannonball travels when shot horizontally with a velocity of 28.3 at 30 degrees? I'm not sure what formula I need to use. Please help.
  61. physics

    A stone is thrown up with a velocity of 39.2 at an angle of 30° above the horizontal find at what times, it will be at a height of 14.7
  62. physics

    A car on the highway travels at 90 km/hr. Express this speed in m/s. can yall show me how to convert this
  63. Physics - please check over

    Could I please get some further assistance on a question I posted earlier? I'm not getting the correct answer and I'm not sure what I'm doing wrong.
  64. Physics

    Name any Margins of error that would happen in the lab "Which path requires the most energy? (gas)
  65. Physics

    a westward force of 20 N acts on a 2.0 kg object moving eastward at 60 m/s for 2.0 s. What is the resulting velocity?
  66. Physics

    Calculate the distance (in ) that Larry runs if he maintains an average speed of 8.9 for 1 hour.
  67. Physics

    A 0.50 kg hammer is taken on a space mission. What is its weight on a planet where the acceleration due to gravity is 3.8 m/s2? 0.50 kg 1.9 kg 0.50 N 1.9 N
  68. physics

    Good job "Drwls", your answer to my bowling ball question worked. Way to go!
  69. Physics

    A polar satellite is launched at 850km above earth.Find its orbital speed.
  70. Physics

    A 2000 kg starts from rest and gains a velocity of 20 m/s in 5 s. What force wad applied on it?
  71. Physics

    On a dt graph if there is a curve from 1 decreasing to 1.2 in an interval does is the velocity and acceleration + or 9? And is it slowing down or speeding up or neither?
  72. physics-

    In a string and pulley problem, will friction increase or decrease the tension.can you please explain if you can?
  73. Physics

    A rubber ball of mass 0.12kg is held at a height of 2.5m above the ground, and then released.
  74. PHYSICS

    How is the evolution of animal like the long necked giraffe explained by Charles Darwin?
  75. physics

    two forces of 10N and 7N respectively are applied simultaneously to an object . The minimum value of their resultant is, in newtons?
  76. Physics..PLZ HELP!

    The magnitude of the magnetic field 8.0 cm from a straight wire carrying a current of 6.0 A is A) 3.0 ƒÎ ~ T. B) 1.5 ~ T. C) 1.5 ~ T. D) 3.0 ~ T. E) 3.0 ~ T.
  77. physics

    I need to know the resistivity of german silver wire. I've looked at a few Google sources and I've seen several different results. Anyone know which value I should use?
  78. Physics 1

    (II) How close to the edge of the 20.0-kg table shown in Fig. 9–47 can a 66.0-kg person sit without tipping it over?
  79. physics

    A 55 kg swimmer crosses a 100 m pool in 12 s. If she moves with a constant velocity, what is her momentum?
  80. physics

    Devise a method for measuring the coefficient of friction between two surfaces using an inclined plane
  81. Physics

    Charges q1 and q2 lie on x axis at points x= -a and x= 5, respectively. (a) how must q1 and q2 be related for the net force on charge +Q at x = a/2 to be zero ? (b) and if +Q is placed at x = 3a/2.
  82. physics

    Find the final speed of the train assuming no friction. Answer in units of m/s
  83. Physics

    What is the wavelength of visible light of 6 x 1014 Hz frequency? 500 nm 400 nm 4000 nm 4 nm
  84. Physics

    Determine the magnitude of current I3. Let the voltage of the bottom battery VB =13.0 volts and r= 1.0 Ω.
  85. Physics

    Aircraft with acceration of magnitude of 42.5 m/s. If starting from rest how long will it take to travel a 2.6 km runway?
  86. physics

    Starting from the constant-acceleration kinematic equations, write a formula that gives xf in terms of t, xi, vf, and a.
  87. physics PLEASE HELP

    how do you rearrange this equation weight=T1sin57+[T1cos57/cos23.5]xsin23.5 when you're trying to isolate T1?????
  88. Physics

    what is the angular speed, in rad/s, of a point on the surface of Jupiter at latitude 72 degrees N?
  89. Physics

    A polar satellite is launched at 850km above earth. Find orbital speed.
  90. physics

    a rock was thrown at the height of 50.0 m above the ground with an initial velocity of 20.0 m/s straight upward.
  91. physics

    Through the process of doing work, what allows energy to move between the external world and the system? the result of what???
  92. physics

    What is the kinetic energy of a car of mass 1900 kg moving at a constant speed of 21 m/s
  93. Physics

    The sum of 2 vectors is the smallest when the angle between them is : a) 0 b) 45 c) 90 d) 180 d) i believe is the correct answer but i'm not sure exactly. Thanks in advance for your help.
  94. physics

    a pendulum swing with a speed of 1.5 m/s at its lowedt point. How high will it rise before it stops
  95. Physics

    If you are 2.0 s from being directly under a window that is 11 m above the sidewalk your standing on, and someone throws a water ballon will you get hit?
  96. physics

    A ball strikes against the floor and returns with double velocity.In which type of collision is it possible?
  97. physics

    A stone is dropped from a 100m bridge. How long does it take the rock to reach the ground?
  98. physics

    Estimate the magnitude of the electric field in a cell membrane with a thickness of 8nm
  99. Physics

    If train travelling 72kmph is to be brought to rest distance of 200m then its retardation should be
  100. physics

    if the resultant of 2 equal force inclint to each other at 60° is 8root3N. Find the component forces?