physics please HELP !

74,851 results, page 62
  1. Physical Science

    What are the noninvasive benefits of the medical technologies that rely on physics of elementary particles?
  2. physics

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

    Two long, parallel wires separated by 90 each carry currents of 2.0 in a horizontal direction.
  4. Physics

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

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

    when two lenses of focal length +10cm and -5cm are placed in contact then find the net power ?
  7. physics

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

    A roller coaster travels 101 ft at an angle of 45.7 ◦ above the horizontal. How far does it move horizontally
  9. physics

    an airplane taking off from a landing field has a run of 500m. Calculate the average acceleration in ft/s2.
  10. physics

    How long will it take a 1920 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
  11. Physics

    Does the period of a satellite in a circular orbit increase or decrease as its distance from earth increases? Thanks :)
  12. Physics

    Q: A car travels in a straight line for 4.6 h at a constant speed of 95 km/h . What is its acceleration? Answer in units of m/s 2
  13. physics

    And and climb up 5 stairs , each of width 20 cm and height 20 cm . Find the distance covered and displacement of ant ?
  14. 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=?
  15. physics

    Earth is approximately a sphere of radius 6.37 × 106 m. What are (a) its circumference, (b) its surface area, and (c) its volume? please help
  16. college physics

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

    An airplane lands and starts down the runway at a southwest velocity of 43 m/s. What constant acceleration allows it to come to a stop in 1.1 km?
  18. physics

    What is the period and frequency of a 10-pound weight oscillating (as a pendulum) on a 5-meter-long rope?
  19. Physics

    How long would it take for a beam of light to travel around the earth in an ideal fiber-optic cable?
  20. physics

    if the wheel on a car accelerates from rest at a constant rate of 1.5rev/s, how fast will it be turning after 3s.
  21. Physics

    Find the maximum height reached by a ball thrown upward at a velocity of 95ft/s
  22. physics

    How fast must you lift a 3.60 kg container of milk if the power output of your arm is to be 21.3 W? how would i approach this question? would i still use P=W/T?
  23. Physics

    The hamiltonian shows you that the energy levels are purtered by the electric fields.The form of the matrix,you can see?
  24. Physics 2

    What quantity of heat is needed to convert 1kg of ice at -10C to liquid at 20C?
  25. physics

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

    A stone of mass m kg is held h metres above the floor 50s.The workdone in joules over this period is
  27. Physics

    Two electrons are fixed 2.99 cm apart. Another electron is shot from infinity and stops midway between the two. What is its initial speed?
  28. PHYSICS

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

    An object is to be thrown through a window 3.5 m high a distance 7.5 m away. It is launched at an angle 70 degreesabove the horizontal.
  30. Physics

    This is about em spectrum? What are the effects of differences in the velocities of electromagnetic waves in different substances... long question
  31. Physics

    For the Law of Sines state the formulas, explain them in your own words, and draw a diagram illustrating one of them.
  32. physics

    Calculate the internal energy of 25.0 g of low-density oxygen gas (O2) at a temperature of 255 K.
  33. Physics

    How long does it take T-Rex to reach its food 200m away assuming that he starts from rest and accelerates at 4.00 m/s2?
  34. 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
  35. physics

    What is the magnitude of the displacement of a car that travels half a lap along a circle that has a radius of 170m ?
  36. principles of physics

    Blood pressure is normally greater in your ____________________. A) arms.B) legs.C) head.D) feet.E) All the same
  37. Physics

    A dragster's top acceleration is 60m/s^2. If it accelerates for 3 seconds from the starting line, how fast will it be going?
  38. Physics

    Two identical gliders slide toward each other on an air track. One moves at 2 m/s and the other at 1 m/s. If they stick together, the combination slides at? Why?
  39. Physics

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

    A girl rows 10 km downstream in 2 h. Her return trip takes 4 h. How fast can she row in still water. in km/h?
  41. Physics

    Is it possible for the frictional force to increase the mechanical energy of a system? If so, give 2 examples with brief explanations. If not, why not?
  42. 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?
  43. physics

    define black body, emissivity, solar constant in relation to heat transfer.
  44. Physics

    What is the frequency of an EM wave emitted most strongly by a glowing element on a stove with temperature 1500 K?
  45. 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?
  46. physics

    Calculate the net work output of a heat engine following path ABCDA in Figure 14.30, where V1 = 5.0 10-3 m3 and V2 = 20.0 10-3 m3.
  47. physics

    A body immersed in liquid has an upthrust of 140N with a density of 12kg calculate the velocity
  48. physics

    Compute the electric field about a uniformly charged plane sheet using gauss law.
  49. physics

    WHAT IS THE REASON BEHIND THE JISKHA"S TEACHERS TO BE NOTHING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!(except Writeacher and STEVE) ARE THEY DAFT OR NUISANCE!!!!!!!!!!!!!!!!!! ANSWWER Me QUICKLY !!!!!!!!!!!!!
  50. physics

    an elevator weighing400kg is to be lifted up at a constant velocity of 3cms-1 what would be the minimum power of motor to be used
  51. Physics

    To what potential a sphere of radius 10cm be charged so that the surface density of charge is equal to 1
  52. 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??
  53. physics

    A ball is thrown vertically upward with a velocity of 100m/s.It will reach the ground after hw many sec?
  54. Physics

    explain the concept of electric potential difference in terms of work done in transferring the charge
  55. physics

    a car traveling at 7.0 m/s accelerates uniformly at 2.5 m/s TO REACH A SPEED OF 12.0 M/S HOW LONG DOES IT TAKE FOR THIS ACCELERATION TO OCCUR?
  56. Physics

    If the fundamental frequency of an 70 cm long guitar string is 470 Hz, what is the speed of the traveling waves?
  57. physics

    suppose you apply 3 newtons of force to slide a box 2 meters in 6 seconds, how much work did you do?
  58. physics

    Find the the force the person must exert on the 14.5 kg lawn mower to accelerate it from rest to 1.5m/s in 2.5 seconds?
  59. Physics

    A 2473 kg elephant is walking at 3 m/s on a flat surface. How much kinetic energy does he have? Answer in Joules
  60. Physics

    A 2473 kg elephant is walking at 3 m/s on a flat surface. How much kinetic energy does he have? Answer in Joules or J
  61. Physics

    "At what point between two masses of 20kg and 15kg located 1.0m apart, will the gravitational field strength equal zero?"
  62. Physics

    A stone with a mass of 20kg and density of 20,000kg/m3 is immersed in water. Find its weight
  63. Physics

    A rock is dropped from a height of 2 meters into a freshwater pond. How would I change the amplitude of this wave?
  64. Physics

    Two protons, an infinite distance apart are brought together to a separation of 1 nm. What is the initial potential energy of the system?
  65. Physics

    How many Joules of thermal energy must be added to 5 kg of water at 20 C to bring it to the boiling point (at 100 C)?
  66. Physics

    explain the concept of electric potential difference in terms of work done in transferring the charge
  67. physics

    Calculate the velocity time graph of a body at rest is given an initial uniform acceleration.
  68. physics

    if the shortest lenght of the tube for resonance is 0.1m and next resonanc length is 0.35m what is the frequency of the vibration.
  69. Physics

    a woman on a bridge 75 high sees a raft floating at a constant speed on the river below.
  70. Physics-VECTORS

    Find the vector's magnitude and direction. Part A A⃗ = 4 i^− 8 j^ A =? θA =?
  71. physics

    Calculate the velocity time graph of a body at rest is given an initial uniform acceleration .
  72. 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?
  73. physics

    what potential difference delta V is required to accelerate protons from the rest to 10% of the speed of light?
  74. physics

    What is the radius of an automobile tire that makes a complete turn in 0.1 sec and has a linear speed of 24.0 m/s?
  75. 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?
  76. 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?
  77. physics/algebra

    82.35 m = (0)t + 1/2(-9.8)t^2 t = 4.1 s is correct Could someone please walk me through this? I could not get an answer because of the negative (maybe my order of operations is wrong) I have no idea!
  78. PHYSICS

    A MACHINE HAS A VELOCITY RATIO OF 5 HAS AN EFFICIENCY OF 40.WHAT EFFORT WOULD BE NEEDED TO LIFT A LOAD OF 100N?
  79. physics

    Calculate the extension that would be produced by a 20N force if 15N extends a spring by 3cm
  80. Physics

    Newtons second law What net force acting on a 14kg wagon produces an acceleration of 1.5 m/s^2?
  81. 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 117 km/h?
  82. physics

    How much heat is needed to convert 1.0kg ice at -5celsius to steam at 105 celsius?
  83. Physics

    A person is travelling 6 km (E) then 4 km (N) and finally 2 km (W). Calculate the average speed And velocity. Show your work
  84. Physics

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

    Calculate the speed of sound wave in air if its frequencies and wavelengths are 256Hz and 1.32m
  86. physics

    If you throw a ball straight upward at a speed of 11 m/s, How long will it take to return to its starting point?
  87. physics

    If you throw a ball straight upward at a speed of 11 m/s, How long will it take to return to its starting point?
  88. College Physics

    How much would you have to raise the temperature of a copper wire (originally at 20 ∘ C) to increase its resistance by 30% ?
  89. physics

    A hunk of cast concrete with a weight of 10 N will float if it displaces 10 N of water. True or False
  90. physics

    problem E2_2 Strain, boundary conditions, displacement and elongation: Part I Plz help.
  91. Physics

    Find the orbital velocity of a satellite orbiting 1800km above sea level in meters per second?
  92. Physics

    What is the centripetal acceleration of an automobile driving at 40 km/h on a circular track of radius 20m? Help ASAP please!!!
  93. physics

    A uniformly accelerated particle covers three successive equal distances in time intervals t1, t2 and t3 respectively.
  94. physics

    A uniformly accelerated particle covers three successive equal distances in time intervals t1, t2 and t3 respectively.
  95. Physics

    I don't understand any thing about the centripital force and torque please HELP me to solve problems about this topics.
  96. physics

    If you throw a ball straight upward at a speed of 11 m/s, How long will it take to return to its starting point?
  97. 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.
  98. 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?
  99. physics

    A 0.0400 kg ice cube at -30.0°C is placed in 0.400 kg of 35.0°C water in a very well insulated container. What is the final temperature?
  100. Physics

    How many moles are there in a 30 cm diameter basketball at a pressure of 160 kpa and temperature of 25 degree celcius.