physics please HELP !

74,641 results, page 58

  1. PHYSICS

    the following data were obtained for the position of a ball as it rolled along a straight track DISPLACEMENT (CM) TIME 2.90 0.60 7.40 2.10 11.00 3.30 22.70 7.20 31.10 10.00
  2. physics

    A 1100 kg sports car accelerates from 0m/s to 33m/s in 13s What is the average power of the engine?
  3. physics

    How can the equation be prove:maximum height,time of flight and maximun range in projectile?
  4. physics

    An elevator weighing 2400 N ascends at a constant speed of 5.0 m/s. How much power must the motor supply to do this?
  5. physics

    a racing car accelerates from rest to 30m/s in 6.0s what is her average acceleration? the answer in the book is 0.5m/s^2
  6. Physics

    You swing a 2.40kg stone in a circle, using the full length of a thin 60.0cm rope.
  7. Calculus

    no one on physics forums seems to know the answer so I was wondering if you guys could help post anser on these forms of course if you can help my question is here h t t p : / / w w w . p h y s i c s f o r u m s . c o m / s h o w t h r e a d . p h p ? t = 4 2 1 7 5 8
  8. physics

    Calculate the internal energy of 25.0 g of low-density oxygen gas (O2) at a temperature of 255 K.
  9. 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?
  10. Physics

    A child slides down a hill on a toboggan with an acceleration of 1.5 m/s squared. If she starts at rest, how far has she traveled in 1.0 s, 2.0 s, and 3.0 s?
  11. Physics

    Where does it takes less time to boils eggs: in a pan of boiling water or in a pressure cooker?
  12. physics

    An elevator is moving upward at 1.00 m/s when it experiences an acceleration 0.28 m/s2 downward, over a distance of 0.74 m. What will its final velocity be?
  13. physics

    An elevator is moving upward at 0.93 m/s when it experiences an acceleration 0.29 m/s2 downward, over a distance of 0.67 m. What will its final velocity be?
  14. physics

    How long will it take a 1630 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
  15. physics

    2. A hockey player is skating in a straight line at 1.5 m/s. He then increases his speed to 7 m/s in 3 s. What is his average acceleration during this 3 s?
  16. physics

    show that the acceleration is 7.5 m/s² for a ball that starts from rest and rolls down a ramp and gains a speed of 30 m/s in 4s
  17. physics

    A family drives 400 milles in 8 hours. Explain how the acceleration of their car changed?
  18. Physics

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

    An automobile with an initial speed of 3.56 m/s accelerates uniformly at the rate of 2.7 m/s2. Find the displacement of the car after 4.1s.
  20. 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.
  21. Physics

    What is the gravitational force between two identical 4,500 kg asteroids whose centers of mass are separated by 120 m?
  22. physics

    What is the force required to move a 22kg ccrate up an incline of 35 degrees, if the coefficient between the two surfaces is .30?
  23. physics

    what is the heat required to convert 0.1 kg of melting ice into steam at 100 degree celcius
  24. Physics

    A car travels in a straight line for 3.9 h at a constant speed of 83 km/h . What is its acceleration? Answer in units of m/s2
  25. Physics

    What exerts the force obn a rocket in outer space to make it move forward?
  26. Physics

    Why is it that interference effects don't show up regularly in glass window panes with two surfaces?
  27. Physics

    What is the potential energy, in joules, of a spring with a force constant of 6 N/m when it is stretched 20 cm from its unstretched length
  28. physics

    calculate the linear momentum of a truck with a mass of 13065kg that is traveling at 36m/s eastward.
  29. Physics

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

    What is the minimum work needed to push a 1025 kg car 290 m up a 17.5° incline with zero friction?
  31. physics

    Where must an object be placed to have a magnification of 3.74 in front of a converging lens of focal length 14.1 cm?
  32. Physics

    A boy sledding down a hill accelerates at 1.25 m/s2. If he started from rest, in what distance would he reach a speed of 5.00 m/s?
  33. physics

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

    An elevator is moving upward at 0.90 m/s when it experiences an acceleration 0.40 m/s2 downward, over a distance of 0.64 m. What will its final velocity be?
  35. physics

    What is the minimum work in joules needed to push a 1540 kg car 44.0 m up a 12.5 degree incline?
  36. Physics

    Where does it takes less time to boils eggs: in a pan of boiling water or in a pressure cooker?
  37. Physics

    A 1250 kg car travelling at 60.0 km/h comes to a sudden stop in 35 m. What is the coefficient of friction acting on the brakes?
  38. physics

    What, roughly, is the percent uncertainty in the volume of a spherical beach ball whose radius is r = 0.84 ± 0.04m ?
  39. Physics

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

    A 15 kg box slides across the floor with an initial velocity of +7.6 m/s. It comes to a stop after sliding +14.8 m. How much friction was present?
  41. Physics

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

    What is the difference between 110, 220 and 440 volts. How does amperage play a role with voltage
  43. Physics

    Why is an ice cube at 0°C more effective in cooling soft drink than the same mass of water at0°C?
  44. Physics

    Where does it takes less time to boil eggs: in a pan of boiling water or in a pressure cooker?
  45. physics

    Strictly speaking, you weigh a tiny bit less when you are in the lobby of a massive skyscraper than you do at home. Why is this so?
  46. Physics

    What is the longest wavelength of light that can be absorbed by a hydrogen atom that is initially in the second excited state?
  47. physics

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

    a particle starts moving from rest with uniform acceleration . it travels a distance y in the next 2 sec
  49. grade 11 physics

    what is the index of refraction of a medium in which the speed of this radiation is 2.54X10^8 m/s? I don't even know where to start...
  50. Physics

    A boy sledding down a hill accelerates at 1.25 m/s2. If he started from rest, in what distance would he reach a speed of 5.00 m/s?
  51. Physics

    An elevator is moving upward at 0.90 m/s when it experiences an acceleration 0.40 m/s2 downward, over a distance of 0.64 m. What will its final velocity be?
  52. Physics

    An elevator is moving upward at 0.97 m/s when it experiences an acceleration 0.34 m/s 2 downward, over a distance of 0.80 m. What will its final velocity be?
  53. physics

    on a cool night with no wind people facing a campfire feel a breeze on their backs. why?
  54. 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?
  55. Physics

    a 475 kg pre-stressed concrete beam is to be raised 10.0 m in 24.0 s. how many kw of power is needed to for the job
  56. PHYSICS HELP

    what is the minimum amount of energy required to accelerate horizontally a 3.0g bullet from rest to a speed of 40.0 m/s?
  57. physics

    A family drives 400 milles in 8 hours. Explain how the acceleration of their car changed?
  58. Physics

    Is this true or false? All objects moving in a circle are accelerated. I really don't uderstand this question.
  59. physics

    A 4430-kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?
  60. maths lit,physics,life science n tourism

    i don't know which career to choose can you help me ?I'm doing grade 11.
  61. physics

    how long will it take a car to cover a distance of 500 meters if it accelerates from rest at a rate of 5.50 m/s2?
  62. physics

    In the Melde's string apparatus, why there is no standing wave in the segment between the pulley and mass hanger?
  63. Physics

    What push parallel to a 42 incline is required to just start a 340 N block sliding up the plane? us = 0.6
  64. physics

    An elevator is moving upward at 1.20 m/s when it experiences an acceleration 0.25 m/s2 downward, over a distance of 0.71 m. What will its final velocity be?
  65. Another physics question...

    Deduce the electric field strenght at a point midway between charges of 7.2*10^-6 C and -3.4*10^-6 C that are 2.0m apart from air. Thank you!
  66. Physics

    A boy sliding down a frictionless plane inclined at an angles 35° with the horizontal. What is the acceleration of the book?
  67. Physics

    Calculate the speed with which a swimmer enters water if she slides down a frictionless ramp that is 2.6 m high
  68. 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?
  69. physics

    on a planet whose mass is twice that of earth and whose radius is same, with what acceleration will a body fall at sea level?
  70. 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?
  71. physics please help

    Forces of 4.57 N and 4.74 N act at right angles on a reddish-green block of mass 5.76 kg. How much acceleration occurs?
  72. physics

    What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 7.9 m/s when going down a slope for 7.4 s?
  73. Physics

    A boy sledding down a hill accelerates at 1.70 m/s2. If he started from rest, in what distance would he reach a speed of 7.40 m/s?
  74. Physics

    A boy sledding down a hill accelerates at 1.70 m/s2. If he started from rest, in what distance would he reach a speed of 7.40 m/s?
  75. Physics (fix)

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

    a ball of mass m is thrown vertically upwards with Vo= 10j m/s. Study nature of motion
  77. physics

    A neutron star has 10 km radius and rotation period 1.2 s What's the centripetal acceleration on its surface at the equator?
  78. physics

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

    an automobile traveling at 25.0 km/h along straight,level road accelerates to 65.0 km/h in 6.00s what is the acceleration
  80. Physics

    What is the tension in the string in (Figure 1) ? The volume of plastic ball is 95 cm3 and the density is 840 kg/m3.
  81. physics

    what force is acting on a circular platform rotating opposite of a person standing on the edge?
  82. 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?
  83. Physical Science

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

    The force applied by the e-brake is F(eb) = m*a(eb) = -8.13*1452 = -12,100 N I didn't get the same answer - I got 11,804.76....please check
  85. physics

    Forces of 9.93 N and 1.23 N act at right angles on a reddish-green block of mass 3.02 kg. How much acceleration occurs?
  86. physics

    define black body, emissivity, solar constant in relation to heat transfer.
  87. physics

    is this right?if 5.0m/s^2=6.0m/s-0/1.2s a=fn/m 5.0m/s=15.0N/3kg show that the 5.0m/s^2 acceleration can result from a net force of 15N exerted on a 3.ok cart
  88. physics

    Correct the following statement: The racing car rounds the turn at a constant velocity of 145 km/hr.
  89. 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?
  90. 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?
  91. Physics

    A train whose speed is 100km/hr rounds a curve whose radius of curvature is 150m what is the acceleration?
  92. physics

    A ball of mass xg is release from a height of 20m . Calculate the time taken to fall to the ground.
  93. physics

    How much force is needed to accelerate a 125 kg block up a 35 degree include at 3.4 m/s2 if the coefficient of friction is 0.28?
  94. physics

    i want a simple laboratory method of determining a young modulus of a long thine wire
  95. Physics

    a rubber ball is thrown downwards off a balcony. after it travels 55m it has a speed of 46.5m/s. what is the initial velocity
  96. physics

    During a hard sneeze, your eyes might shut for 0.43 s. If you are driving a car at 125 km/h, how far does it move during that time?
  97. physics

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

    A mango fruit drops from the top of it's tree which is 40 m. How long does it takes to reach the ground
  99. College Physics

    If the uncertanty in the slope is 1.214×10-14, is the measured value of ε0 within experimental uncertainty of the accepted value? (Yes or No)
  100. physics PLEASE HELP ME

    a rubber ball is thrown downwards off a balcony. after it travels 55m it has a speed of 46.5m/s. what is the initial velocity
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