Physics!

74,730 results, page 47
  1. physics

    A firefighter at street-level, 55.0 m away from a burning building, directs a stream of water from a fire hose at an angle of 35.0° above the horizontal. If the speed of the stream is 50.0 m/s, at what height will the stream of water strike the building?
  2. Physics

    0.75 mol of argon gas is admitted to an evacuated 40 cm^{3} container at 40 C. The gas then undergoes an isochoric heating to a temperature of 500 C. Before I forgot to write the question...so the question is What is the final pressure of the gas? *
  3. Re: PHYSICS

    "Relative" is an important word. Block L of mass mL = 1.90 kg and block R of mass mR = 0.500 kg are held in place with a compressed spring between them. When the blocks are released, the spring sends them sliding across a frictionless floor. (The spring
  4. Physics

    PLEASE SOMEONE HELP ME WITH THIS DARN QUIZ. I'm so lost and all my teachers are too 'BUSY' to help me. :/ I'm getting so sick and tired of studying and not getting it but then having to take the blame for my instructor's folly. 2. Which of the following is
  5. As Physics

    Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge Calculate the number of free electrons
  6. Physics

    Make a predictive statement about the path dependence of accelerations due to gravity
  7. physics

    5. An object that has kinetic energy must have ____________________. A) momentum. B) acceleration. C) a force applied to it. D) All of these. E) None of these.
  8. Physics

    what is the mass of the toy truck if the force of friction holding it in place is 18.5N u= 0.2 at 30 degrees
  9. Math Physics

    What is the wavelength of an electromagnetic wave with frequency 50.0 MHz? Am I starting this problem like this? 3.00*10^8/50*10^6 =6*10^12
  10. physics

    The speed of a train increased from 15 mi/hr to 25 mi/hr in a distance of 500 ft. Calculate the average acceleration in ft/s2.
  11. PHYSICS

    a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine?
  12. physics

    A car starts from rest and accelerates for 8.7 s with an acceleration of 4.4 m/s 2 . How far does it travel? Answer in units of m.
  13. physics

    a mass if 10kg move with a velocity of 4ms-1find it kinetic energy.
  14. Physics

    Find speed of sound in air if distance is 170 meters and time is 1.1 second
  15. physics

    how many energy is transferred when 8.9g of liquid hydrogen changes to gas -253 degree celsius
  16. physics

    A car starts from rest and accelerates for 2.8 s with an acceleration of 2.1 m/s2. How far does it travel? Answer in units of m
  17. PHYSICS

    A 30 kg. balloon is filled with 100 m to the third power of helium. how much force is needed to hold it down?
  18. physics

    2) The weight of tank is 50 000 kg, area of his belts is 5 m2. What pressure acts on the ground?
  19. Physics

    A ball is thrown straight up at 24.0 m/s. Ignore the effects of air resistance in your calculations.After 2.00 s?
  20. Physics

    What is the direction of force of friction on a bicycle on front and back wheel while paddling?
  21. physics

    2) The weight of tank is 50 000 kg, area of his belts is 5 m2. What pressure acts on the ground?
  22. physics

    How much heat in KJ is needed to change 3.0 kg of ice at -10C into (superheated) steam at +150C ?
  23. Physics

    How would I find final velocity at the top of an inclined ramp with a given angle theta?
  24. physics

    An object accelerates uniformly from rest at a rate of 2 m/s2 for 3 s and then 5 m/s2 for 15 s. Find its final velocity?
  25. physics

    Why is there always a difference between the experimentally calcuated error for resistance, and the actual components tolerance value?
  26. Physics

    Write each number in scientific notation: 1) 15.01 ans. Is it 15.01 x 10 minus to the power of 2?? Am i wrong?
  27. Physics

    During takeoff, a plane goes from 0 to 50 m/s in 8s. What is its acceleration? Halos fast is it going after 5 s? How far had it traveled by the time it reaches 50 m/s?
  28. physics

    calculate the kinetic energy of a body of mass 2kg moving with a velocity of 0.1m/s.
  29. Physics

    if you push a wall with a force of 50N, the work you do is...... (a)500J (b)5000J (c)50J (d)zero
  30. Physics

    Find the force necessary to stop a 900 kg jetta traveling at +25 m/s in a time of 5.0 seconds.
  31. Physics

    What is net capacitance if maximum potential is 40 volt and instant charge is 60 coulomb.?
  32. Physics

    A car going 50 m/s undergoes an acceleration of 2 m/s^2 for 6 seconds what is the final velocity ? How far did it travel while it was accelerating?
  33. physics

    What average power is required for a runner with a mass of 80 kg to reach a speed of 8.2 m/s during a time of 1.8 s?
  34. physics

    In a certain right triangle, the two sides that are perpendicular to each other are 7.00 m and 8.30 m long. What is the tangent of the angle for which 7.00 m is the opposite side?
  35. physics

    A wheels is turned at prequency at 2.0 revelation per second and then is allow to come to rest. If it those so in 30sec ? How far did it turn in aprocess
  36. physics

    What is its acceleration just before and just after reaching this point? (Ignore air resistance.) a. less than g b. equal to g c. greater than g
  37. Physics

    What is the average power output of a weightlifter who can lift 260 kg to a height of 1.9 m in 1.8 seconds?
  38. Physics

    As one exhales, what change in energy takes place between the diaphragm and the air in the lungs?
  39. Physics

    Still stuck...see post at 3:34pm. I don't think I'm understanding the instructions regarding what #'s to use for sin and cos.
  40. physics

    How would you find the coefficient of kinetic friction if you're given a weight of 627 N and theta=45 degrees?
  41. Physics

    Find the uniform acceleration that causes's a car's velocity to change from 39.7 m/s to 74.0 m/s in an 5 second period of time.
  42. physics

    12.oo volt battery is connected in a series to 4 identical 5.00 ohm resistors what is the current
  43. Physics

    An object is thrown upwards with a speed of 14.0 m/s. How long does it take to reach its maximum height
  44. physics

    an aluminium sphere of 20cm diameter is heated from 0¡ãc to100¡ãc. what is the change in its volume?
  45. physics

    What is the frequency of the microwaves in a microwave oven? The wavelength is 12 cm. I have to give the answer in GHz
  46. Quick Physics Question

    Are both linear and angular momentum conserved in static equilibrium ?
  47. physics

    Work out the gravitational potential energy of a 2kg brick at a height of 9 metres.
  48. Physics

    Two parallel forces of magnitude 4 and 6 newton are acting on a body placed at 4m apart. Resultant force will be
  49. physics

    meteoroid is speeding through the atmosphere, traveling east at 17.0 km/s while descending at a rate of 11.7 km/s. What is its speed, in km/s?
  50. Physics

    What is the normal force when a 40 kg person jumps and is accelerating at 3 m/s2 upward while in contact with the ground?
  51. physics

    how high must a 2 kg basketball be thrown so that the top of its arc, it has a potential energy of 160J?
  52. physics

    2) The weight of tank is 50 000 kg, area of his belts is 5 m2. What pressure acts on the ground?
  53. physics

    What is the average current through a conductor that carries 4 375C during a 2 min time period?
  54. Physics

    The parabolic TV antenna receives electromagnetic waves from satellites. What is special about these rays?
  55. physics

    the two crates 40-kg and 60-kg are to be accelerated upward to a ship at the rate of 0.30-m/s2 determine the tension in each rope ?
  56. physics

    An arc lamp operates at 80V . suggest a method to use it with 240 V d.c. source
  57. physics

    An arc lamp operates at 80V . suggest a method to use it with 240 V d.c. source
  58. physics

    What is the gravitational potential energy of a ball with a weight of 72 N when it is sitting on a shelf 1.4 m above the floor?
  59. Physics

    What is the normal force when a 40 kg person jumps and is accelerating at 3 m/s2 upward while in contact with the ground?
  60. Physics

    What is the rotational inertia of a 10 kg rod with a length of 0.9m and rotating about an axis passing through its end?
  61. physics

    when looking at a window, you see two reflected images slightly displaced from eachother. Why/ Is it because glass is more dense.
  62. physics

    What are the factors that affect the quantity of heat needed to raise the temperature of a substance?
  63. Physics

    A cooking pot contains 0.8kg of water at 100degree celcius what is the specific heat
  64. Physics

    what do you call the source of an intense narrow beam of coherent monochromatic light?
  65. physics

    What force is needed to accelerate a child on a sled with the total mass of 43kg at 1.5m/s
  66. physics

    In what direction and with what speep must he push away his pack in order to return to his vehicle in 30s?
  67. Physics

    How long does it take a car to change it velocity from 15m/s if it accelerarate uniformly at 5m/s square?
  68. Physics

    A car travelled at an average speed of 200km/h. What distance does it cover in 10minutes.
  69. physics

    A wheel has turned through 120 revs in 10 s after starting. find the angular acceleration.
  70. Physics

    If 9.30 x 10^5 J of energy are transferred to 2.00kg of ice at 0 deg C, what is the final temperature of the system?
  71. Physics

    A meteoroid is speeding through the atmosphere, traveling east at 19.0 km/s while descending at a rate of 12.9 km/s. What is its speed, in km/s?
  72. physics

    Start from the origin and go east for 80km. Then go north 192 km. Make a drawing.
  73. physics

    Why do car have head rest?your answer should include the word"force"and "velocity"
  74. Physics

    A car is traveling North. In which direction are the wheels turning. This is under the torque chapter
  75. Physics

    A meteoroid is speeding through the atmosphere, traveling east at 14.8 km/s while descending at a rate of 12.5 km/s. What is its speed, in km/s?
  76. Physics honors

    If a racer runs at an average speed of 7m/a how far will she run in 1 min 45 seconds?
  77. physics

    why do cars have head rests?your answer should include the word ''force'' and ''velocity''
  78. physics

    What are the dangers associated with electricity in your home? What can be done to limit or prevent the possibilities of dying or getting hurt?
  79. Physics

    Find the longest wavelength by resonating air in 20 cm tube which is opened both ends
  80. physics

    If a solid is stretched or compressed beyond the point that it can return to its original shape it has passed its
  81. Physics

    1. Name three different kinds of graphs that are often used to plot information and discuss the value of each. i have no idea what the heck this means
  82. physics

    If one walks straight up a 10 degree incline, what is the height achieved after walking 10 kilometers ?
  83. physics

    How much heat (in kJ) will it take to bring 56 kg of ice at -8°C to dry steam? Answer to 3 significant figures
  84. PHYSICS/MATH

    What is your average power if you lift a 33.8 kg box at a constant speed to a height of 3.27 m in 6.10 s?
  85. physics

    If a coffee can has a radius of 63.0 cm and a height of 15.8 cm find its volume round to neaerest cm3
  86. physics

    what is the greatest acceleration can be generated by a runner if coefficient of friction between shoes and road is 0.95
  87. Physics

    How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.8 µC?
  88. physics

    calculate the net force required to give a 3000kg trucks an acceleration of 2.5m/s^2
  89. Physics

    A bicycle with tires .064 m in diameter travels 8.1 km. 1. How many revolutions do the wheels make?
  90. PHYSICS

    explain how exotic matter stabilizes a wormhole,google's answer was not direct
  91. physics

    How close must two electrons be if the electric force between them is equal to the weight of either at the earth's surface?
  92. physics

    Why do car have head rest?your answer should include the word"force"and "velocity"
  93. physics

    If an arrow is fired at 200km/h horizontally, about how long will it take to strike a target 30 meters away?
  94. PHYSICS

    A girl rows 10 km downstream in 2 h. Her return trip takes 3 h. How fast is the current. in km/
  95. physics

    Can an adult male be rescued from a fall by tying a rope to a car's axle?
  96. Physics "scientists"

    * JJ Thomson * a) How does his experiment of cathode ray tube relates to electrostatics? >> PLEASE HELP ME!! :( :)
  97. Physics

    Two electrons exert a force of repulsion of 0.96 N on each other. How far apart are they? The elemental charge is 1.602 × 10 −19 C .
  98. physics

    What is the evidence for the claim that iron exists in a relatively cool outer layer of the sun?
  99. Physics

    How much work must be done to bring three electrons from a great distance apart to 1.0 * 10^(-10)m from one another (at the corners of an equilateral triangle)?
  100. Physics

    What distance does Anna covered by running on a circular track of length 500m?