physics please HELP !

74,641 results, page 56

  1. Physics

    Two positive charge of 12cand 8c are 10cm apart each other. The work done in bringing them 4cm closer is
  2. Physics

    calculate the magnitude of the resultant of a pair of 100-km/h velocity vectors that are at right angles to each other. Please help me! thanks!
  3. physics

    Three balls A, B, and C, with masses of 3 kg, 1 kg, and 1 kg, respectively, are connected by massless rods. What are the coordinates of the center of mass?
  4. physics

    Probability of getting two heads among 4 coins for r = 0, 1, 2, 3, 4 find values of Pr, rPr, (r - r̄)2Pr and sum of r
  5. physics

    Probability of getting two heads among 4 coins Complete the columns r Pr rPr (r - r̄)2Pr 0 1 2 3 4 sum
  6. physics

    the speed of the train increased from 15 mi/hr to 25 mi/hr in distance of 500 ft. calculate the average acceleration in ft/s^2
  7. physics

    Which floats with most of its volume below the surface? A) None of these.B) An oak log.C) All of these.D) An iceberg.E) A mountain range.
  8. physics

    How long, in seconds, is required for a car traveling at a speed of 32 km/hr to travel 110 m?
  9. physics

    define the term torque or moment of force. Give its units and dimensions
  10. 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?
  11. physics

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

    Which floats with most of its volume below the surface? A) None of these.B) An oak log.C) All of these.D) An iceberg.E) A mountain range.
  13. Physics

    A constant 5 N horizontal force hits a stationary 2 kg ball. What is the balls speed after going 10 m?
  14. physics

    When the experimental set up is immerse in water of refractive index n=1.5.what will be the charge in beta?
  15. physics

    Find the time constant (T) for the RC circuit with an open switch given t = 10 ms 50% of Qmax charge T = ? Q = CV (1-e -t/T)
  16. Physics

    A Ferris Wheel with a radius of 15 meter makes one complete rotation every 10 seconds.
  17. physics

    A stone is dropped from a ledge 45m high. What will its speed on reaching the Earth be?
  18. Physics

    The body mass is 0.4kg , its hung on a spring with stiffness of 90 N/m What is the frequency of its oscillation?
  19. Physics

    A force of 150N is exerted horzontally to dispalacement through adstance of 400cm.how much work done?
  20. math

    In physics class, the girl to boy ratio is 3 to 4. If there are a total of 14 students, how many girls are there?
  21. physics

    A young girl is on a swing that completes 20.0 cycles in 25 seconds. What are its frequency and period?
  22. Physics

    At what frequency would a capacitor of 2.5 microfarads used in a radio circuit have a reactance of 250 ohms
  23. Integrated Physics and Chemistry

    The ____ motion of a star can be determined by studying its spectrum
  24. Physics

    What is the angular momentum (in J*s) of a mass of 1.45 kg which completes an orbit about a point 23.0 meters away every 5.30 seconds.
  25. physics

    determine the energy of a photon radio wave electromagnetic radiation. i know which formula to use 6.64*10^-34 what
  26. physics`

    which has more momentum: a snail moving at .001m/s or a 2-ton boulder resting on the ground? why?
  27. physics

    A car traveling at +6.3 m/s accelerates at the rate of 0.65 m/s^2 for an interval of 2.2 s. Find vf . Answer in units of m/s
  28. physics

    150g of ice at 0'c is mixed with 300g of water at 50'c. calculate the temperature of a mixture
  29. Physics

    A ball is allowed to fall freely from certain heightn. What distance it covers in 1st second?
  30. Physics

    What is the gravitational force vetween 2 15-kg packages that are 35cm apart? What fraction is this of the weight of one package?
  31. Physics

    The body mass is 0.4kg , its hung on a spring with stiffness of 90 N/m What is the frequency of its oscillation?
  32. physics

    A ball is thrown straight up with an intial velocity of 85 ft/s. At what times will it have a height of 200 ft?
  33. PHYSICS

    a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine? Please help
  34. physics

    determine the kinetic energy of a boy mass 40kg running with velocity of 3m/s
  35. Physics

    What is the wavelength of light that can cause a transition of an electron in the hydrogen atom from the orbit with n = 6 to n = 8?(answer in µm)
  36. physics

    5. An object that has kinetic energy must have ____________________. A) momentum. B) acceleration. C) a force applied to it. D) All of these. E) None of these.
  37. Physics

    Contrast the metric units of distance, time, and speed. Describe the relationship between them.
  38. PHYSICS

    WHAT IS MAGNITUDE OF NORMAL FORCE IN FIGURE WITH V=+3M/S +10n INSIDE BOX IS 5KG
  39. physics

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

    i cant get this right. what is the measured resistance of a 1000ohm, 500ohm and a 100 ohm resistor. and there % error
  41. Physics

    2. Contrast the metric units of distance, time, and speed. Describe the relationship between them.
  42. physics

    What is the rotational speed of the minute hand on a clock? Convert from rad/s to rev/s
  43. physics

    State how the centripetal force is provided in the case of a satelite orbiting the earth
  44. PHYSICS

    a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine?
  45. PHYSICS

    WHAT IS MAGNITUDE OF NORMAL FORCE IN FIGURE WITH V=+3M/S +10n INSIDE BOX IS 5KG
  46. Physics

    2. Contrast the metric units of distance, time, and speed. Describe the relationship between them.
  47. physics

    expressions for the force experienced by the charge when it enters the magnetic field at an angle?
  48. Physics

    Can measuring the time between seeing the lightning and hearing the thunder really tell you how far away the lighting struck? If so, then how does it work?
  49. PHYSICS

    A 30 kg. balloon is filled with 100 m to the third power of helium. how much force is needed to hold it down?
  50. physics

    under what conditions can you use the formula W=Fnetd to calculate the work done on an object? Describe at least two requirements.
  51. physics

    if a race cars velocity increases from 4 m/s to 36 m/s over a 4 s time interval, it average acceleration would be 10 m/s2.
  52. physics

    What are the factors that affect the quantity of heat needed to raise the temperature of a substance?
  53. physics

    the speed of a bullet of mass is 40gram is 216km/h what is the kinetic energy in joule
  54. Physics

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

    2. Contrast the metric units of distance, time, and speed. Describe the relationship between them.
  56. physics

    Find the electric field at the folowing radii from the center of this charge configuration.
  57. 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.
  58. Physics

    2. Contrast the metric units of distance, time, and speed. Describe the relationship between them.
  59. physics

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

    find the angle of projection at the horizontal range is twice the maximum height of a projecyile
  61. physics

    calculate angular momentum and rotational kinetic energy of earth about its own axis
  62. Physics

    How would a physics expert respond to the following suggestions made by three airline executives? Write a script of the expert's response for performance in front of the class. Airline Exectutive A: Since the earth rotates from west to east, we could operate 'static flights'--...
  63. Physics

    What is the resultant of two displacement vectors having the same direction? a. The resultant is the sum of the two displacements having the same direction as the original vectors. b. The resultant is the difference of the two displacements having the same direction as the ...
  64. Physics as repost please answer and help

    Silver plating: A student attempts the process of silver plating to determine the mass of a silver atom. a series of objects are measured, then electroplated for a measure period of time, while maintaining a steady current through a solution of silver nitrate in tap water. ...
  65. physics

    A mass m = 76.0 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius R = 19.7 m and finally a flat straight section at the same height as the center of the loop (19.7 m off the ground). Since the mass would not make it around the loop if ...
  66. Help with physics!

    Hi! I need some help with some physics questions. 1. When two point charges are moved farther apart, what is true about their resulting electric and gravitational forces? a. both forces stay the same b. gravitational force stays the same but electric force increases c. ...
  67. Physics

    Hi! I need some help with some physics questions. 1. When two point charges are moved farther apart, what is true about their resulting electric and gravitational forces? a. both forces stay the same b. gravitational force stays the same but electric force increases c. ...
  68. Physics

    Two forces, F1 and F2, act on the 5.00 kg block shown in the drawing. The magnitudes of the forces are F1 = 69.0 N and F2 = 24.5 N. What is the horizontal acceleration (magnitude and direction) of the block? F1 is pointing at the top left corner of the box forming a 65 degree ...
  69. physics problems

    I went back through my book again to find the answers can you check them? 10. when rewinding a an audio tape or vdieotape, one reel winds fastest at the end. which reel is this? why does it speed up? (this one I understand. I think that it has something to do with rotational ...
  70. physics homework

    I went back through my book again to find the answers can you check them? 10. when rewinding a an audio tape or vdieotape, one reel winds fastest at the end. which reel is this? why does it speed up? (this one I understand. I think that it has something to do with rotational ...
  71. Physics (please help!!!!)

    Sorry to repost this, again, but I still don't understand. Newton’s Law of Gravity specifies the magnitude of the interaction force between two point masses, m1 and m2, separated by the distance r as F(r) = Gm1m2/r^2. The gravitational constant G can be determined by ...
  72. Physics sorry for reposting but I really need help

    An example of the neutron absorption reaction is . 1 0 n+10 5 B-->7 3 Li+ 4 2 He The rest masses of each particle in atomic mass units (u) are 1 0 n= 1 u 10 5 B=10 u 7 3 Li =7 u 4 2 He= 4 u where 1u=1.66x10^-27 kg. calculate Q Q= in MeV I have the same question please ...
  73. Physics I need help someone plz help out

    An example of the neutron absorption reaction is . 1 0 n+10 5 B-->7 3 Li+ 4 2 He The rest masses of each particle in atomic mass units (u) are 1 0 n= 1 u 10 5 B=10 u 7 3 Li =7 u 4 2 He= 4 u where 1u=1.66x10^-27 kg. calculate Q Q= in MeV I have the same question please ...
  74. physics

    home / study / science / physics / questions and answers / a 10kg block slides towards the 3kg moving block ... Your question has been answered! Rate it below. Let us know if you got a helpful answer. Question A 10kg block slides towards the 3kg moving block to create a ...
  75. Physics Urgent!!!!! I really need help with this

    Sorry to repost this, again, but I still don't understand. Newton’s Law of Gravity specifies the magnitude of the interaction force between two point masses, m1 and m2, separated by the distance r as F(r) = Gm1m2/r^2. The gravitational constant G can be determined by ...
  76. Physics to Elena

    Estimate the total binding energy for copper. 550 MeV Estimate the energy, in joules, needed to break a 3.0g copper penny into its constituent nucleons. E= in Joules Please help me out I got 1st part I need the Energy in joules am confused please help me out...thanks Physics...
  77. physics

    DRWLS: PLEASE SEE ADDITIONAL INFO AT THE BOTTOM its the second part of the question that I don't understand: according the graph shown, the net force acting on an object varies wth the object's displacement. Calculate the work down by the force on the object at the various ...
  78. Physics

    how much work is needed to raise a 6.0 Kg object14.0 m at constant speed?assume that friction is negligible.
  79. physics

    a projectile is fired at an angle of 60 degrees with the horizontal and with the initital velocity of 80 m/s. What is the time of flight?
  80. physics

    compute the least acceleration with which a man of mass 75 kg can slide down a rope which can sustain a weight of 580 N
  81. Physics

    Can anyone help? the resistance of the side lights on an automobile are 10 ohms. How much current flows in them when connected to 12 volts
  82. PHYSICS

    An airplane accelerates down a runway at 3.20 m/s 2 for 32.8 s until is finally lifts off the ground. Determine the distancetraveled before takeoff.
  83. 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?
  84. physics

    if two forces 10N and 20N are inclined at angle 60degree to each other. Find the resultant force.
  85. physics

    find the resistance of 134m of No.20 copper wire at 20 degrees C (p=1.72x10^-6Ohom cm , A= 2.07x10^-2 cm ^2)
  86. Physics

    Could someone tell me how to start to solve this? Please How much current flows in a 1000-ohm resistor when 1.5 volts are impressed across it?
  87. Physics

    explain the concept of electric potential difference in terms of work done in transferring the charge
  88. Physics

    a woman on a bridge 75 high sees a raft floating at a constant speed on the river below.
  89. ap physics

    How fast would a 1200 kg car travel if it had the same linear momentum as a 1500 kg truck traveling at 90 km/h?
  90. physics

    a cricket ball is takes 3 sec to reach the maximum height its initial velocity is???
  91. Physics

    If a tern travels 3.20 x 10^4 km south in 122 days, what is its average velocity in kilometers per day?
  92. physics

    at time t=0 the driver starts to brae determine how long the bus takes to stop
  93. physics

    If a cart is initially travelling at 3.5 m/s, and has a mass of 200g, what is it's kinetic energy (LEAVE OUT units of J)?
  94. physics

    How much time does a passerby on the sidewalk below have to move out of the way before the flowerpot hits the ground? Answer in units of s.
  95. physics

    if the gravitational constant, increased to a billion times its actual value, what sorts of things would happen?
  96. ap physics

    a 37.4-kg traffic light is supported by two wires prove you answer applying newtons law
  97. Physics

    What is the strength of the magnetic field a distance of 1 meter from a wire carrying a current of 1 A? B=MoI ------ 2(pi)r Mo=4(pi)x 10^-7 I=1 A How do I know what r is?
  98. physics

    At 7.15 cents per kilowatt-hour, what does it cost to leave a 75.0W light burning 24.0 hours a day?
  99. Physics

    A football is kicked at 15 m/s with an angle of 35 degrees with the ground. How long is it in the air? How far will it land? Can someone help plz... Thanks!
  100. Physics

    State the reason why a steel sphere resting on a horizontal surface is said to be in neutral equilibrium.
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