physics please HELP !

74,755 results, page 63
  1. physics

    A body is executing of amplitude 1m . Its velocity while passing through mean position is 10m/s . Find its frequency
  2. Physics

    In a hydrogen atom, if the radius of the orbit of the electron is doubled, then its energy will ... >> Increase by a factor of 2??
  3. physics/science

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

    How much work does a refrigerator with a COP of 3.8 require to freeze 660 g of water already at its freezing point?
  5. physics

    My teacher needs us to formulate a question for the science fair. Till now, we have only learned the Kinematics equations, HELP, please....
  6. Physics

    Calculate the speed of an 7.8×104 kg airliner with a kinetic energy of 1.0 × 109 J. Answer in units of m/s.
  7. physics

    if a pitcher throws a ball at 101 mph and it trvels 60.5 feet. How much wiil it drop?
  8. 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 =
  9. physics

    a pendulum with a length of .600 m has a period of 1.55 s. what is acceleration due to gravity at the pendulums location
  10. physics

    if a car moving 180km/h reduces to 72km, what is the percentage change in kinetic energy?
  11. physics

    a 747 airliner reaches its takeoff speed of 170 in 35.0 .what is the magnitude of its average acceleration
  12. mathematical method of physics

    expand 3sin(4x)+4cos(10x) in to functional series of e(exp)ix
  13. 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?
  14. Physics

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

    When a transverse wave on a string is reflectred from the free end the phase change produced is-------
  16. physics

    two electric charges +10 microC and -20microC are located .35 m apart how much work is required to double the distance between them?
  17. 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
  18. 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?
  19. physics

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

    The force of tension of a rope is 300N. If a man is 50 m above the ground, what is the longest time it could take him to get to the bottom?
  21. 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?
  22. physics

    two electric charges +10 microC and -20microC are located .35 m apart how much work is required to double the distance between them?
  23. 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.
  24. physics

    Why does the pitch of the sound produce by blowing over an open end of a bottle change when you have more water in it?
  25. 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
  26. 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?
  27. Physics

    A 2.0-kg rock falls from a height of 25 m to a point 20 m above the ground. How much potential energy does it lose? GIVEN: mg = 2.0 kg h/d = 5 m PE = mgh PE = (2)(5) PE = 10 J
  28. physics

    what is the kinetic energy of a 3 kg 20 cm diameter bowling ball with a linear velocity of 4m/s? (rolling and spinning)
  29. physics

    state the energy hans-formation which occurs when a car is brought to rest by its break
  30. PHYSICS ROLLING MOTION!!!

    A unicycle with a tire 44.0 cm in diameter travels 2.00 km. How many revolutions does the wheel make?
  31. physics

    true or false: according to einstein, a gravitational field is equivalent to an accelerating frame of reference.
  32. PHYSICS

    lIST THE PARTICLES THAT MAKE UP AN ATOM. wHAT ARE THEIR CHARGES? hOW ARE THEY ARANGED? wHAT IS THE APPROXIMATE AMU OF EACH PARTICLE?
  33. Physics

    List the particles that make up an atom. What are their charges? How are they arranged? wHat is the approximate amu of each particle?
  34. 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
  35. 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?
  36. 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?
  37. physics

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

    if some of water in calorimeter splash out when tranfering the metal block, will it affect the experiment result?
  39. Physics

    What potential energy does a 60.0-kg gymnast acquire in climbing 5.00 m up a vertical pole? GIVEN: mg = 60 h/d = 5.00 m PE = mgh PE = (60)(5.00) PE = 300 J
  40. Physics

    Why is the voltage of the electricity produced by power stations is increased before its transmitted through the national grid? Please help Thanks
  41. Physics

    A long jumper leaves the ground at an angle of 24.3◦ to the horizontal and at a speed of 10.6 m/s. How far does he jump?
  42. Physics

    A car travels in a straight line for 4 h at a constant speed of 63 km/h. What is its acceleration? Answer in units of m/s^2?
  43. Physics

    A student walks from her apartment a distance d=139m to the bus stop at a speed of v1= 1.40m/s.
  44. 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
  45. Physics

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

    How much work must be done to bring three electrons from a great distance apart to within 2.1×10−10 {\rm m} from one another (at the corners of an equilateral triangle)?
  47. physics

    determine the velocity and kinetic energy of neutrons having de broglie wave length 1 angstrom
  48. Physics

    A stone is dropped into a bore well 490m deep.after how time,the sound of splash of will be heard
  49. Physics

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

    A stone is dropped into a bore well 490m deep.after how time,the sound of splash of will be heard
  51. Physics

    What is the car's forward acceleration,at a speed of 30m/s,when the driving force on the wheels is 650N
  52. Physics

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

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

    What magnitude point charge creates a 13000 N/C electric field at a distance of 0.220 m?
  55. Physics

    What is the mass of water in a closed room 5.2m x 6.3m x 2.5m when the temperature is 24 degrees celsius and the relative humidity is 65%?
  56. physics

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

    A hot plate has a resistance of 50 Ω. If the current flowing through it is 2.4 A, then the potential difference across the device is:
  58. 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?
  59. Physics

    The speed of light in vacuum depends on, 1)wavelength 2)frequency 3)intensity 4)temperature 5)none of the above I know that 1 and 2 are correct. What about the others?
  60. physics

    A boy sledding down a hill accelerates at 1.20 m/s2. If he started from rest, in what distance would he reach a speed of 6.10 m/s?
  61. physics

    explain why microwaves are better carriers of signals for long range transmission of radio waves?
  62. Physics

    Two objects of masses m1 and m2 fall from the height respectively. The ratio of the magnitude of their momenta when they hit the ground?
  63. physics

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

    AN OBJECT MASS OF 10KG IS PLACED ON AN INCLINED PLANE AT 30 degree at the horizontal calculate recreation between two su
  65. physics

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

    A spring has k = 88 N/m. Use a graph to determine the work needed to stretch it from x = 3.6 cm to x = 5.6 cm, where x is the displacement from its unstretched length.
  67. physics

    State the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS b. +0.50 DS c. +1.75 DS
  68. 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?
  69. 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?
  70. 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
  71. physics

    Find the force when two poles to strength 100 and 90 cgs units are placed at a distance to 20 cm a part.
  72. PHYSICS

    he following data were obtained for the position of a ball as it rolled along a straight track DISPLACEMENT (CM) 2.90 7.40 11.00 22.70 31.10 TIME 0.60 2.10 3.30 7.20 10.00
  73. 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.
  74. PHYSICS

    A roller coaster travels 101 ft at an angle of 45.7 ◦ above the horizontal How far does it move vertically
  75. 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?
  76. Physics

    How much work is done by a girl weighing 450N while carrying a 2kg package up a 2m flight of stairs?
  77. physics

    14,0 of KOH is neutralised in 1dm^3 of water by sulphuric acid with a concentration at 0,1 mol dm^-3 how do i calculate it
  78. Physics

    How many calories of heat will a person lose by evaporating 1250g of water and perspiration in a day?
  79. Physics

    I have a 1000 ohm resistor with a measured resistance of .967 how do I use submultiples or mutliples to get it in the SI units?
  80. Physics

    how much potential energy does Tim, with a mass of 62.0kg, gain when he climbs a gymnasium a distance of 3.8m?
  81. physics

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

    George takes off for a long jump at an angle of 28 degrees, and lands 6.9 m away. How fast was he when he jumped?
  83. physics

    light from the sun travels 1.5x10km to reach the earth .how long does it journey take in minutes?
  84. 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?
  85. physics

    damon,reiny,steve,ms sue.plz get a solution 2 my question please itz urgent!!!
  86. Physics

    An object with a mass of 3kg is dropped from 56.3 meters. How far above the ground is it's kinetic energy 1073J?
  87. 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?
  88. physics

    A ball is thrown vertically upward with a speed of 27.6 m/s. How high does it rise? Answer in units of m.
  89. physics

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

    Two equal charges of magnitude 0.00000000032 is placed in an electric field. calculate the force of attraction between them
  91. physics

    If a race car completes a 4mi oval track in 73.2s, what is the average speed in units of mi/h?
  92. physics

    How much potential energy does DeAnna with a mass 57.0 kg, gain when he climbs a gymnasium rope a distance of 3.7 m?
  93. 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?
  94. Physics

    If 2.4 m3 of a gas initially at STP is compressed to 1.6 m3 and its temperature raised to 30oC, what is the final pressure?
  95. Physics

    how much potential energy does Tim, with a mass of 62.0kg, gain when he climbs a gymnasium a distance of 3.8m?
  96. physics

    a 333 hz and 337 hz tuning forks are struck simultaneously. whats will be the beat frequency?
  97. physics

    a person throws a ball upward into the air with an initial velocity of 20.0 m/s, calculate how high it goes
  98. Physics

    In an AC circuit with a frequency 25 Hz producing an rms voltage of 30 V and a 20 farad capacitor, what is the end current?
  99. 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?
  100. physics

    An airplane lands and starts down the runway at a southwest velocity of 44 m/s. What constant acceleration allows it to come to a stop in 1.3 km?