physics please HELP !

74,851 results, page 65
  1. physics

    what is the wavelength of radar waves with the frequency of 6.0*10^10Hz? a. 0.0010m b.0.010m c.0.050m d.0.0050m
  2. Physics

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

    Figure 18-23 shows three linear temperature scales, with the freezing and boiling points of water indicated.
  4. physics

    A stone is projected vertically upward with a speed of 20 m/s. a. What is its velocity at the end of 2s? b. What is the height reacted after 2s?
  5. physics

    A 4.53 kg particle has a velocity of vx = 3.98 m/s and vy = −3.16 m/s. Find the magnitude of its total momentum. Answer in units of kg · m/s
  6. Physics Science

    How many kilocalories of heat are required to melt 20.0 kg of ice at 0°C? Okay so the given is m=20.0kg Ti=0°C HeatFusionIce=80 kcal/kg
  7. physics

    A kettle brings water to boil by using 233 C of charge over the course of 1.25 minutes. The amount of current that was used is _.__ A?
  8. physics

    Explain why helicopters need 2 rotors to fly in a straight line. Talking about centripetal force.
  9. physics

    with a cart of unknown mass, could you still determine whether its total energy is conserved? explain your reasoning
  10. physics

    a 60kg sprinter accelerates from rest at 2.5m/s east for 4s. what force is acting and what is his final speed?
  11. Physics

    Two objects are near a bar magnet. One is about 1 cm away, while the other is 6 cm away. Compare and contrast the magnetic force that affects each object. What do they want me to do?
  12. physics

    A 2.8 kg air mattress is 2 m long, .5 m wide, & .1 m thick. What mass can it support in water before sinking?
  13. Physics

    1. Could a horizontal axis of rotation be used satisfactorily in an experiment uniform circular motion? Explain
  14. physics

    A skater is gliding along the ice at 2.2 , when she undergoes an acceleration of magnitude 1.2 for 3.0 . At the end of that time she is moving at 5.8
  15. physics

    Find the acceleration of the two blocks sliding down the incline in the figure below. (Take m1 = 1.1 kg and m2 = 1.8 kg. Indicate the direction with the sign of your answer
  16. physics/math

    If you are driving 116 km/h along a straight road and you look to the side for 3.0 s, how far do you travel during this inattentive period?
  17. physics

    ok so dr= 2i + 3j while F= 5i + 2j It wants me to find the work. now i know w=Fxdr. what i want to know is why when you take the dot product of both, you get a different answer compared to when you just multiply the magnitudes.
  18. physics

    a boy pulls a bucket of water of mass sky from a well of depth 10 cm calculate the work done ?
  19. Physics

    A skydiver has a terminal velocity of 9.0 m/s. If they have a mass of 98, what is their k value for their air resistance? Use g = 10 m/s/s and do not report units on your answer, they should be N s/m.
  20. physics

    two equal vectors of magnitude 2A are inclime perpendicular to each other find the resultant and direction of vector.
  21. Physics

    What's the tangential acceleration of a freely swinging pendulum when it makes an angle θ with the vertical?
  22. physics

    An object experiences an impulse, moves and attains a momentum of 200 kg m/s. If its mass is 50 kg, what is its velocity?
  23. ap physics

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

    A yo-yo of radius 10 cm and mass 1 kg is dropped from rest. What is the instantaneous torque on the yo-yo if I hold the string with my fingers?
  25. Physics

    At a spot in the ocean, the surface irradiance is 7.8*10^16 photons and k=.14 m^-1. At what depth does the euphotic zone end?
  26. physics

    a 50 gram object is accelerating at a rate of 5 m/s2. calculate the force needed to produce this acceleration
  27. Physics

    What coefficient of friction is required to stop a hockey puck sliding at 12.8 m/s initially over a distance of 66.5 m?
  28. Physics

    a truck is traveling in a straight line goes 60km in 83minutes. what is its average speed in km per hour?
  29. AP Physics

    What is the potential energy of an electron and proton in a hydrogen atom if the distance between them is 5.3*10^-11? ANSWER k=9*10^9 Q=1.6*10^-19 q=1.6*10^19 Ue=? Ue=KQq/r Ue=-4.4*10^-18 j
  30. Quantum Physics

    An electron drop to what energy level is likely to emit a photon in the infrared region?
  31. Physics

    I don't understand how to do this : A force of 40 N accelerates a 7.17 kg block at 6.0 m/s2 along a horizontal surface. Determine the normal.
  32. Physics

    A guitar string has a mass of 30g and length of 2m. Find the tension if its density is 0.2kg/m^3
  33. Physics

    the co efficient of friction of a plane inclined at 30 degree is 0.4 . Then the acceleration of the body sliding freely on it is?
  34. physics

    a 333 hz and 337 hz tuning forks are struck simultaneously. whats will be the beat frequency?
  35. physics/electrical circuits

    if there are eleven resistors of 33k ohms each in parallel, what is the total resistance?
  36. physics

    A hunk of cast concrete with a weight of 10 N will float if it displaces 10 N of water true or false
  37. AP Physics B

    What is the force of Friction as a 12 kg object slides down for 30 meters down a 30 degrees incline at a constant velocity?
  38. Physics

    why do photoelectrons emitted from a metal surface has energy distribution for an incident radiation of frequency?
  39. Physics

    What coefficient of friction is required to stop a hockey puck sliding at 12.8 m/s initially over a distance of 66.5 m?

  41. physics

    how much time does it take for a student running t an average speed or 5.00m/s to cover a distance of 2.00km?
  42. Physics

    If your hands are wet and no towel is handy, you can remove some of the excess of water by shaking them. Why does this get rid of it?
  43. physics

    with what velocity must a ball be thrown in order to achieve the height of 50 ft.? and how long will it stay in the air?
  44. Physics

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

    Assume the distance axis is linear and da = 10.0m and db = 35.0 m. Estimate the work done by a force F in moving a 2.80 kg object from da to db.
  46. physics

    Which phase of matter consists of particles that are locked into place and unable to move past each other?
  47. Physics

    Express the angular velocity of 36 rpm (revolutions per minute) in units of radians per second (rad/s).
  48. physics

    Calculate the extension that would be produced by a 20N force if 15N extends a spring by 3cm
  49. 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
  50. 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?
  51. physics

    A cara accelerates uniformly from rest to a speed of 21.9 km/h in 8.5 s. Find the distance it travels during this time.
  52. Physics

    Initial velocity is 21 m/s, the angle is 40 degrees, 20 meters away from the wall. How long is the ball in the air for?
  53. Physics

    What is the maximum total force exerted on a 71 kg astronaut by her seat during the launch of the Space Shuttle?
  54. fristyear physics

    two girls a and b weighting 40 and 30 kg both of them pull 14m held by them.they will meet when covers a distance of?
  55. physics

    a tsunami originating in japan has a wavelength of 10^5 m and a period of 10 mins. how long does it take to travel 8000km?
  56. Physics

    How many coulombs pass through a wire that carries a current of 3.2 A for 5.0 h? I=Q/t Q=It Q=3.2*5*60 Q=960 I am told this is not the correct answer.
  57. 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)
  58. Physics

    Calculate the radial acceleration of an object on the ground at the earth's equator in m/s2, turning with the planet.
  59. Physics

    A ball falling from rest is located 45 m below its starting point 3.0 s later. Assuming that its acceleration is uniform, what is its value?
  60. physics

    the density of a block of wood with a colume of 50 cubic centimeters and a mass of 10o grams is
  61. physics

    You should expect concrete to have an elastic constant that is _____ than wood. a. larger than b. smaller than c. equal to
  62. Physics

    Katie kicks a football at a 52 degree angle and a velocity of 31 m/s. At what times will it be 10 meters off the ground?
  63. Physics

    How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above?
  64. Physics

    How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above?
  65. physics

    Two equal point charges of +3.00 * 10^ -6 C are placed 0.200 m apart. What are the magnitude and direction of the force each charge exerts on the other?
  66. Physics

    How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above?
  67. Physics

    a coin is placed on a stereo revolving at 33.3 revolutions per minute. what is its centripetal acceleration when it is placed 5 cm from the center of the turntable?
  68. physics

    need help decomposing theses vectors to x and y 52.9 meters at 19 degrees rectangular cor-ordinate system
  69. physics

    What is the relationship between the coefficient of friction and the time that it takes the object to reach the bottom of the ramp?
  70. Physics

    Does the voltage output increase when a generator is made to spin faster? Defend your answer.
  71. pure maths, agriculture,life sciences, physics

    i want to know what does those subject i choose fall under which career
  72. Physics

    What will a spring scale read for the weight of a 75 kg woman in an elevator that moves upward with acceleration 0.30 g? w=?
  73. Physics

    With the energy needed to warm up some amount of water from 40C to 64C, how high could you lift it?
  74. physics

    A aluminum wire has a diameter and uniform electric field of imposed along its entire length
  75. Physics

    How much energy must be removed from 30 L of liquid water at 0-degree celsius in order to convert it to ice?
  76. Physics

    A baseball is thrown horizontally from a height of 3.6 meters at a speed of 24 m/sec. How far will it travel along the ground?
  77. physics

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

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

    Find the orbital velocity of a satellite orbiting 1800km above sea level in meters per second?
  80. 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.
  81. physics

    Explain how an object can orbit a planet & why astronauts float around in the orbiting space shuttle
  82. Physics

    Two spherical objects with a mass of 7.60 kg each are placed at a distance of 2.93 m apart. How many electrons need to leave each object so that the net force between them becomes zero?
  83. physics

    a metal spoon is placed in one of two indentical cups of hot coffee. Which cup will be cooler after a few minutes?
  84. Physics

    How much potential energy does Tim, with mass 60.0 kg, gain when he climbs a gymnasium rope a distance of 3.5m?
  85. physics

    what is the net force on a car cruising at a constant velocity on (a) a level ground and (b) going up a hill
  86. Physics

    Calculate the distance (in km)that Larry runs if he maintains an average speed of 8km/hr for 45 minutes.
  87. Physics

    Why is the total distance traveled by a mass traveling in a circle of radius R during n revolutions, 2piRn?
  88. physics

    Find the rms speed of H2O molecules in atmospheric water vapor at a temperature of 13.2° C.
  89. Physics

    To what potential a sphere of radius 10cm be charged so that the surface density of charge is equal to 1
  90. physics

    a pendulum clockis lag by 2 min during a whole 24 hours.what correction should be made in its length so that it keep the right time?
  91. physics

    a guy throws a ball up and catches it 3.5 seconds later. what is the max height and initial velocity. Please help!
  92. Physics

    2point charges of 1mc & 4mcr places 0.15m apart find the null point between them..?
  93. Physics

    What is the minimum energy needed to change the speed of a 1600 kg sport utility vehicle from 15.0 m/s to 40.0 m/s?
  94. Physics

    At highway speeds, a particular automobile is capable of an acceleration of about 1.52 m/s2. At this rate, how long does it take to accelerate from 74.0 km/h to 104.0 km/h? (in s)
  95. physics

    A 30.0 kg block falls from a height of 30,4 m. assuming a closed system its speed just before hitting the ground is about?
  96. Physics

    A car travels in a straight line for 4.8 h at a constant speed of 63 km/h . What is its acceleration? Answer in units of m/s 2
  97. Physics

    A 100-n boulder is sitting on a shelf 0.5 meters above the floor. What is the potential energy when its in its new location?
  98. Physics

    What is the gravitational force between two 10 kg iron balls separated by a distance of 0.1 m? How does this compare with the weight of one ball?
  99. Physics

    Two spherical objects with a mass of 2.88 kg each are placed at a distance of 2.12 m apart. How many electrons need to leave each object so that the net force between them becomes zero?
  100. Physics

    a bb gun has a muzzle velocity of 325 ft/sec. How long will it take the bb to hit the ground? How far will the bb travel?