physics please HELP !

74,755 results, page 57
  1. Physics

    A loud speaker emits energy in all directions at a rate of 2.75 J/s . What is the intensity level at a distance of 25 m?
  2. physics

    If a car is traveling westward with a constant velocity of 20 m/s, what is the net external force acting on it?
  3. physics

    calculate how far along the ground would the bicycle move if one of the wheels had an angular displacement magnitude of 500rev
  4. 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?
  5. physics

    A motorcycle, initially traveling at a speed of 14 m/s, slows down (decelerates) at a rate of -3.5 m/s2 for 2 s. How far does it travel during that time?
  6. physics

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

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

    What should be the minimum initial velocity with which a missile has to be launched so that it reaches a target of 1000km away in the same plane
  9. 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
  10. physics

    A 7.9 kg object undergoes an acceleration of 2 m/s2. What is the magnitude of the resultant force acting on it? Answer in units of N.
  11. Physics

    If a man travels 7km N 40degree W and 10km East, find the resultant displacement.
  12. science (physics)

    thank you for your help! my question is :how do you find the magnitude of the electric field that will balance the weight of an electron?
  13. Physics

    Explain how a drop of water bulging over the edge of a coin demonstrates surface tension.
  14. Physics

    How can you easily increase the magnetic field strength inside a current carrying coil?
  15. physics

    how much heat must be added to 4.00 kg of aluminum to cause its temperature to rise from 22 degrees C? unit of answer must be joule
  16. 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?
  17. physics

    Mechanical energy is the difference between the kinetic and potential energies of an object true or false?
  18. 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?
  19. physics

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

    Two objects attract each other gravitationally with a force of when they are 0.25 m apart. Their total mass is 4.00 kg. Find their individual masses
  21. Physics

    Why is the total distance traveled by a mass traveling in a circle of radius R during n revolutions, 2piRn?
  22. physics

    A flashlight that is powered by 12 Volts and uses a bulb with a resistance of 90 Omega will have a current _________________ Amps.
  23. 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?
  24. physics

    A 1.5 volt battery will increase the potential energy of ________________ coulombs of charge by 0.18 joules.
  25. physics

    A passengers jet flies from one airport to another 1,200 miles away in 2.5h .Find its average speed.
  26. physics

    a 747 airliner reaches its takeoff speed of 170 in 35.0 .what is the magnitude of its average acceleration
  27. Physics

    Could someone tell me how to start to solve this? Please How much current flows in a 1000-ohm resistor when 1.5 volts are impressed across it?
  28. physics

    Calculate the speed of an 7.6×104 kg airliner with a kinetic energy of 1.2 × 109 J. Answer in units of m/s
  29. Physics

    What is the centripetal acceleration of an automobile driving at 40 km/h on a circular track of radius 20m? Help ASAP please!!!
  30. 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>
  31. physics

    if the masses remain the same ,but the separation is decreased to one-half of the original distance . what happens to the gravitation force?
  32. physics

    How much work must an ideal refrigerator perform to make 1 kg of ice at -10C from 1 kg of water at 20C when 20C is also its exhaust temperature?
  33. Physics

    A football player kicks with a speed of 21 m/s at 37 degree to the horizontal. How long is the ball in the air?
  34. physics: relativity

    I think I can rearrange the Lorentz contraction equation, solving for v using: v=sqrt[1-(L/Lo)^2] x c^2 Would someone check my thinking please? Thanks
  35. Physics

    Two bullets have masses of 4.6 g and 11 g, respectively. Each is fired with a speed of 41.0 m/s. a) What is the kinetic energy of the first bullet? Answer in units of J.
  36. physics

    calculate the work done in lifting a 300N weight to a height of 10m with an acceleration 0.5 m/s square.
  37. Physics

    When an inflated baloon is been put in the freezer for 15 minutes, which of the ideal gas law is the observation
  38. physics

    What is the relationship between the coefficient of friction and the time that it takes the object to reach the bottom of the ramp?
  39. Physics

    r vector=(340m, 39 degrees below positive x-axis) What is rx and ry? I have no idea how to do or approach this problem, anyone please help and explain how to do this? Thank you!
  40. physics

    If a race car completes a 4mi oval track in 73.2s, what is the average speed in units of mi/h?
  41. 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
  42. science-physics

    What is the formula to calculate the speed of the electron the has a mass of 0.910000000000000000000000000000 kg and a radius of 0.5290000000000 m?
  43. physics

    what is the acceleration due to gravity at a distance of 2 earth radii abouve earths surface?
  44. Physics

    If your hands are wet and no towel is handy, you can remove some of the excess of water by shaking them. Why does this get rid of it?
  45. Physics

    If a man weighs 900 N on the earth, what would he weigh on jupiter, where acceleration due to gravity is 25.9 m/s^2?
  46. Physics

    How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above?
  47. Physics

    How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above?
  48. Physics

    How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above?
  49. Physics

    A football is kicked at 15 m/s with an angle of 35 degrees with the ground. How long is it in the air? How far will it land? Can someone help plz... Thanks!
  50. physics

    Two uniform spheres , each of mass M and radius R, touch one another. What is the magnitude of their gravitational force of attraction?
  51. Physics

    Explain atomic line spectra in terms of transitions between discrete energy levels.
  52. physics

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

    If a race car completes a 4mi oval track in 73.2s, what is the average speed in units of mi/h?
  54. 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
  55. Physics

    the teacher said something about doing the correct sig figs..im not sure if it applies to this, im so confused! 10.2* 7.5 =76.5? 27.1/5.31 =5.103578154425612?? 2.712 + 10.8= 13.512?
  56. 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
  57. 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
  58. Physics

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

    A volleyball player serves the ball horizontally with a speed of 23.8 m/s. How far will it have dropped when it reaches a distance 9.1 m
  60. physics

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

    An elevator is moving upward at 1.03 m/s when it experiences an acceleration 0.31 m/s2 downward, over a distance of 0.73 m. What will its final velocity be?
  62. physics

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

    Tin melts at 232 under standard atmospheric pressure. Express this temperature in kelvin
  64. Physics

    Displacement is to distance as velocity is to: a. acceleration b. mass. c. speed. d. time I chose C....is this correct?
  65. Physics

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

    A certain bacterium swims with a constant speed of 4.61 µm/s. How long will it take to swim across a petri dish that has a diameter of 8.69 cm?
  67. PHYSICS

    what is the angle velocity of an object in a horizontal circular part with radius 1.5 with a constant speed of 12/s
  68. physics

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

    two electric charges +10 microC and -20microC are located .35 m apart how much work is required to double the distance between them?
  70. 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?
  71. physics

    a dragster starting from rest accer;ates at 49m/s how fast is it going when it has raveled 325m?
  72. physics

    a cyclist moves around equilateral triangle6kn/h10km/h,12km/hfind average speed?
  73. Physics

    a coin is placed on a stereo revolving at 33.3 revolutions per minute. what is its centripetal acceleration when it is placed 5 cm from the center of the turntable?
  74. Physics

    A boy sledding down a hill accelerates at 1.65 m/s2. If he started from rest, in what distance would he reach a speed of 7.30 m/s?
  75. 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
  76. Physics

    How much energy must be removed from 30 L of liquid water at 0-degree celsius in order to convert it to ice?
  77. physics

    An object is projected at an angle of elevation of 45 degree with a velocity of 100m/s. Calculate it's range
  78. physics

    What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 10.5 m/s when going down a slope for 3.18 s?
  79. 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)?
  80. physics

    How does one go about solving this? A skateboard rider starts from rest and accelerates at a constant +.50 m/s^2 for 8.4s. What is the riders displacement?
  81. 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?
  82. physics

    if a race car's velocity increases from 4 m/s to 36 m/s over a 4 s time interval, its average acceleration would be 10 m/s 2 ? IS THIS TRUE ?
  83. physics

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

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

    arthur is riding a horse at a velocity of 4m/s.four seconds after,he is already traviling at a valocity of 12m/s. what is his acceleration?
  86. physics

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

    Janetjumpsoffahighdivingplatformwith ahorizontalvelocityof2.96m/sandlandsin thewater2.8slater. Howhighistheplatform ?Theacceleration ofgravityis9.8m/s2.
  88. physics

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

    What is the mass of a paratrooper who experiences an air resistance of 400 N and an acceleration of 4.5 m/s2 during a parachute jump.
  90. physics

    A ball tossed upward reaches a maximum height of 3.0m. Show that its initial speed was 7.7m/s.
  91. Physics

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

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

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

    a baseball is thrown horizontally at a velocity of 35 m/s from a height of 1.5 m. How long does it take to hit the ground? how far does it travel?
  95. physics

    For an object in equilibrium the sum of the torques acting on it vanishes only if each torque is calculated based on your:
  96. physics

    If the building absorbed so much heat that it turned into a liquid, then it would have undergone a phase change known as _________.
  97. Physics

    A car travels in a straight line for 5.4 h at a constant speed of 79 km/h . What is its acceleration? Answer in units of m/s2.
  98. PHYSICS ASAP!

    A Football is kicked 66.6 meters in 5.39 seconds. What was the initial velocity? Magnitude and Direction
  99. Physics

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

    in einstein's famous equation e=mc^2, describing the relationship between matter and energy, the units for E are m=====>kg, c=====>m/s a) kg m/s b)kg m/s^2 c) m^2/s^2 d)kg m^2/s^2 I think its either B or D but indecisive...