physics please HELP !

74,672 results, page 65

  1. Physics- 8th Grade

    What force is needed to accelerate a 10 kilogram shopping cart 3 m/s^2 (squared)?
  2. physics

    Mechanical energy is the difference between the kinetic and potential energies of an object true or false?
  3. 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
  4. physics

    what is the formula to calculate the following: how much force is needed to move a 10 pound block 10 feet in 8 seconds>
  5. physics

    a student does 314 J of work in moving a desk 2.1 m. What was the magnitude of the applied horizontal force?
  6. 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 4 s
  7. physics

    How much charge passes through a cross-sectional area of a copper wire in 0.8 s if I = 3.5 A? 1 C -Work equation?
  8. Physics

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

    A 2.73 kg particle has a velocity of vx = 6.02 m/s and vy = 0.316 m/s. Find the magnitude of its total momentum. Answer in units of kg · m/s
  10. Physics

    A bowling bowl has a mass of 25 KG. What is the acceleration of the ball if an upward force of 110 N is applied?
  11. Physics

    Find the magnitude and direction of the equilibrant force for these two concurrent forces: 13.5 N, E and 32.0 N, N. Pls HELP me answer this. Thank u very much.
  12. physics

    Which of the following physical properties can be used to measure temperature using a thermometer? A)volume B)pressure C)density D)viscosity I got A
  13. 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?
  14. Physics

    I am curious how the earth work as an omnipresent conductive surface in an electrical distribution system?
  15. physics

    Mechanical energy is the difference between the kinetic and potential energies of an object true or false?
  16. physics

    the making of polymers is an example of the category of work done by chemists caledd _______ fill in the answeerrr
  17. 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?
  18. Honors Physics

    Give some examples of applications that have resulted from work done by physicists on the exploration of space.
  19. Physics

    A solid weigh 45N and 15N respectively in air and water. Calculate the relative density
  20. PREAP Physics

    From what height would a compact car have to be dropped to have the same kinetic energy that it has when being driven at 100 km/hr?
  21. physics

    A cylindrical container 1.7 tall contains mercury to a certain depth, . The rest of the cylinder is filled with water
  22. Physics

    A 1300 sports car accelerates from rest to 90 in 6.5 . What is the average power delivered by the engine?
  23. 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?
  24. physics

    How long will it take a 1030 W motor to lift a 330 kg piano to a sixth-story window 13.0 m above?
  25. physics

    A car is traveling at 33.0 m/s  when the driver uses the brakes to slow down to 29.0 m/s in 2.50 seconds.   How many meters will it travel during that time
  26. Physics check

    Atoms whose nuclei have the same number of protons but different numbers of neutrons are called.... isotopes?
  27. Physics

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

    What is the time it takes a mosquito to flap its wings once if the frequency of their wing beats is 440Hz?
  29. physics

    a projectile launched speed of 31.1m/s at angle 71.2 degrees above horizontal fill in table time 0 vx m/s 10.0m/s vy 29.4m/s ax? ay?
  30. Physics

    A 70 g ball moves 45m/s. If its speed is measured to an accuracy of 0.10% what is the minimum uncertainty in its position?
  31. 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.
  32. physics

    A cars starts from rest and after 20 seconds its velocity becomes 108 km-1 find the acceleration of the car
  33. physics

    How much centripetal force is needed to keep a 0.20 kg ball on a 1.50 m string moving in a circular path with a speed of 3.0 m/s?
  34. physics

    How much centripetal force is needed to keep a 0.20 kg ball on a 1.50 m string moving in a circular path with a speed of 3.0 m/s?
  35. Physics

    What is the gravitational force between a proton and an electron in a hydrogen atom if they are separated by distance of 5.29x10^-9 cm.
  36. Physics

    I think it is D) but I'm not quite sure. Thanks in advance! Right after the ball is thrown at angle of 45 deg, the acceleration is a)g b)sin(45) * g c)cos(45) * g d)tan(45) * g
  37. Physics

    What is the gravitational force between a proton and an electron in a hydrogen atom if they are separated by a distance of 5.29x10^-9 cm
  38. Physics

    A 3.0 cmm high object is placed 10 cm from a concave mirror whose radius of curvature is 10 cm. Where is the image located?
  39. 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
  40. PHYSICS

    a 3000 N car is moving at 12.0m/s comes to a stop while skidding a distance of 25.0m. what is the coefficient of kinetic friction?
  41. Physics

    Two positive charges of 0.2microC and 0.01 microC are placed 10cm apart. Calculate the work done in reducing their distance to 5 cm
  42. physics

    Write the equation for fill factor in terms of V_max, V_oc, J_max, and J_sc. FF =
  43. physics

    Calculate the watts of power expended when a force of 1.8 N moves a book 2.0 m in a time interval of 1.0 M/S
  44. physics

    if some of water in calorimeter splash out when tranfering the metal block, will it affect the experiment result?
  45. 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?
  46. mathematical method of physics

    expand 3sin(4x)+4cos(10x) in to functional series of e(exp)ix
  47. Physics

    Explain atomic line spectra in terms of transitions between discrete energy levels.
  48. 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
  49. 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
  50. physics/science

    i don't understand why radioactive waste is stored underground is it because it is a harmful substance
  51. physics

    A truck increases its speed from 8 m/s to 28 m/s over a distance of 120 m? How long does this take? Assume that the acceleration is constant
  52. AP Physics

    What minimum speed does a 130 g puck need to make it to the top of a 3.8 m -long, 23 ∘ frictionless ramp?
  53. 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?
  54. Physics-Please help

    Could someone remind me how to calculate this on the TI-84 Calculator: Which buttons do I hit for this: 3 * 10^8/5.4 * 10^14 I'm inputting it and coming up with 5.55 E 21 It should come out to be 5.55 *10^-7 but I'm not doing the input correct Please help
  55. physics

    a guy throws a ball up and catches it 3.5 seconds later. what is the max height and initial velocity. Please help!
  56. 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?
  57. Physics

    How much time is needed to produce 840 joules of work if 100 watts of power is used?
  58. 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?
  59. PHYSICS!

    Find the gauge pressure in pascals in a soap bubble 0.04 m in diameter. The surface tension is 25.0 x 10^4 Pa.
  60. 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?
  61. Physics

    all electric field lines start on positive charges. explain why this makes sense.
  62. physics

    find the altitude change of a 10000-kg fighter which clims and in so doing, loses 100 m/s of airspeed
  63. 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?
  64. Physics

    calculate pressure in each foot?elephant 3200kg covers in each its feet an area equal 0.08(ms)
  65. Physics

    A yo-yo has a string length of 0.200 m What is the slowest speed at which you can spin it to keep it in a fixed path? What is this, and how do you find it? Thanks
  66. physics

    if a todler is moving at 15m/s and covering a distance of 1900m. how much time does it take to cover this distnace?
  67. Physics

    State the physical quantities one has to measure in order to determine the young's modulus of a wire?
  68. 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
  69. 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?
  70. physics

    Determine the cubical expansion of a liquid of volume 20liters at 30°c and 20.35 liters at 100°c
  71. PHYSICS

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

    A Brass rod 50.0 cm long expands 0.0734 cm when heated. Find the temperature change.
  73. Physics

    A stone is thrown straight up. To reach a height of 6.49 m above its release point, what must its initial speed be in m/s?
  74. physics

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

    A particle is projected with a speed of 39.2m/sec at an elevation of 30degrees.find its greatest height.
  76. physics

    Doubling the frequency of a wave source doubles the speed of the waves. ( True or False)
  77. physics

    List four effects that can be observed that demonstrate light travels in straight lines. Does anybody know the answer??
  78. Physics

    A 4610 kg helicopter accelerated upwards at 2 m/s^2. What lift force is exerted by the air on the propellers?
  79. PHYSICS

    two forces of magnitude 8N making an angle of 30 and 120 with xaxis . the y component of resultant A/ O B/ 4N C/ 8N D/ 16N
  80. physics

    The grid in a high-vacuume triode is usually kept negatively charged with respect to the cathode so that the electrons may be
  81. Physics

    What is the relationship between me pushing my daughter my on a swing and colored light shining on the cones in my eyes?
  82. physics

    Discuss what happens when a man fires a pistol in front of a flight of stairs in a large hall.
  83. 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=?
  84. physics

    if a todler is moving at 15m/s and covering a distance of 1900m. how much time does it take to cover this distnace?
  85. Physics

    What is the number of the highest harmonic that could be heard by a person who is capable of hearing frequencies up to 1.00×104 Hz?
  86. Physics

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

    D=m/V=m/ð•R^2•h Find the density of a 4.2- kg solid cylinder that is 13 cm tall with a radius of 5.0 cm. I am lost on the numbers to plug into this one please help
  88. 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?
  89. Physics II

    find the pressure at the bottom of a vessel 76cm deep when filled with a) water b)mercury (sp.g. 13.6)
  90. Physics

    Q1. What is the working principle of the loudspeaker. Q2.Explain the following:- 1.Beat 2.Shock wave 3.Mach effect.
  91. Physics

    To what potential a sphere of radius 10cm be charged so that the surface density of charge is equal to 1
  92. 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
  93. physics

    A commuter backs her car out of her garage with an acceleration of 1.6 m/s2. How long does it take her to reach a speed of 2.3 m/s in seconds
  94. physics

    At what rate is a 60.0-kg boy using energy when he sprints up a flight of stairs 10.0 m high in 8.00 s? A. 75.0 W B. 48.0 W C. 735 W D. 480 W E. 4.80 kW
  95. Physics

    What is the speed of a hockey puck of mass 0.15 kg if it experiences a force 60 in N for the extent of a slap shot of 0.25 m?
  96. Physics

    When light passes from one medium to another then which of the following parameters may change? Velocity, frequency, colour or wavelenght?
  97. Physics

    A stone is thrown vertically upward with a speed of 19.0m/s How fast is it moving when it reaches a height of 10.0m
  98. Physics

    a boat sails 150km N60°E, then 100km West. What is it's displacement from its starting point?
  99. physics

    how can we collect sound energy from outside? then it can be converted into electricity with the help of transducer. Have to prepare a model on this. Please earlier.
  100. Physics

    How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?
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