Physics!

74,459 results, page 47

  1. physics

    How do we compensate for thermal expansion /contraction in the construction of metal pipes for carrying steam?
  2. physics

    Name Two solid materials having very low linear expansivity ?
  3. physics

    A liquid expands on heating. Explain briefly how its density will change with rise in temperature
  4. physics

    Name Two solid materials having very low linear expansivity ?
  5. physics

    A liquid expands on heating. Explain briefly how its density will change with rise in temperature
  6. physics

    a rock was thrown at the height of 50.0 m above the ground with an initial velocity of 20.0 m/s straight upward.
  7. physics

    A women walks 2m in the direction 60degrees north of east. find her final displacement.
  8. physics

    A women walks 2m in the direction 60degrees north of east. find her final displacement.
  9. physics

    A car starts from rest and accelerates for 6.7 s with an acceleration of 1.6 m/s2 . How far does it travel? Answer in units of m
  10. Physics

    From the position vs time graph of an object moving with constant acceleration, how could you find the velocity
  11. physics

    A ball is thrown straight up with an intial velocity of 85 ft/s. At what times will it have a height of 200 ft?
  12. physics

    A 8.2 kg object undergoes an acceleration of 2.5 m/s2. What is the magnitude of the resultant force acting on it? Answer in units of N
  13. Physics

    What is the acceleration experienced by the tip of the 1.5 cm-long sweep second hand on your wrist watch?
  14. physics

    A 3.00 kg rock is dropped from a bridge and strikes the water below with a velocity of 40.0 m/s. What is the momentum at impact?
  15. physics

    How far (in meters) must a 800 kg pile driver fall, if it is to do 18000 J of work?
  16. physics

    How much work in joules must be done to stop a 5000 kg car traveling at 120 km/hr?
  17. 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?
  18. Physics

    A woman drops a basketball, how far does it fall in one second? use formulas
  19. physics

    what is the power of a 6 ohm bulb when 3 of such bulbs ar econnected in a 12 volt parallel circuit?
  20. Physics

    What is the resonant frequency in an RLC circuit if R=5 , C=6, and L=12 mH, and V-115 V? (a) 593 (b) 41,400 (c) 1560 (d) 1793
  21. physics

    What is the magnitude of the momentum of a car weighing 1,555 N when it is moving at a speed of 23 m/s? Express your answer in kg m/s.
  22. physics

    A drag racer accelerated from 0 to 475km/h in 4.88 s. Assuming a constant acceleration, how far did it travel?
  23. physics

    A 8.20 cm tall object is placed 30.0 cm in front of a concave mirror with a focal length of 4.20 cm. What is the magnification?
  24. physics.pls help

    A 100g bird siis in its nest. what is the Fnet(net force) in this case?
  25. Physics

    What is the speed of a transverse wave in a rope of length 1.50 m and mass 69.0 g under a tension of 500 N?
  26. Physics

    A car slows to a stop over a certain distance. What could cause the stopping force to be greater?
  27. Physics

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

    What is the acceleration experienced by the tip of the 1.5 cm long sweep second hand on your wrist watch
  29. physics

    a car accelerates along a straight road from the rest to 90 km/h in 5 s what is the magnitude of its average acceleration
  30. Physics

    Air in a balloon does 25 J of work while absorbing 81 J of heat. What is the change in internal energy?
  31. physics

    how long does a car with an acceleration of 2.0 m/s^2 take to go from 10m/s to 30m/s?and show the solution how do you get the answer.
  32. physics

    A 2.40- bullet embeds itself in a 1.20- block, which is attached to a spring of force constant 770 .
  33. physics

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

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

    How much energy is stored in the 120 uf capacitor of a defibrillator if the potential across the plates is 4 x 10^3 V?
  36. physics

    if a 40.0-g stone is whirled horizontally on the end of a 0.60-mstring at a speed of 22m/s what is the tension in the string?
  37. Physics

    How much heat energy is required to convert 0.1000kg of ice at -10.0 C into water at 50 C?
  38. Physics

    A dynamics cart m1 attached to has a hanging mass m2 m1 = 0.20 kg, and m2 = 1.3 kg. The magnitude of the acceleration of this system will be what approximately?
  39. physics

    a plane is flying at 250 km hr an hit a 50 km hr headwind what is its resultantt speed relative to the ground
  40. physics

    what is your final velocity after 680 meters if you start out at 90km/hr and acceleration is 9 m/s
  41. physics

    how do you find time when all you're given are two different speeds the height and the angle?
  42. physics

    if you exert a force of 500N to walk 4M up a flight of stairs in 4S , how much power do you use?
  43. physics

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

    Calculate the speed (in m/s) of a skateboarder who accelerates from rest for 4 seconds down a ramp at an acceleration of 3 m/s2.
  45. mathematical method of physics

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

    How much work is needed to stop a 20g bullet moving with speed of 150m/s
  47. physics

    In the figure below, qA = 6.0 µC, qB = 2.6 µC, qC = 1.3 µC, dAB = 4.00 cm, and dAC = 3.00 cm. Determine the magnitude and direction of the net force on qA
  48. physics

    What will be the magnitude of work if a force of 25N pulls a stone through distance of 5m in its direction ?
  49. physics

    A jet travels at 434 m/s. How long does it take to travel 294 m? Answer in units of s
  50. physics

    find the apparent weight of a 18 cm by 12 cm by 6 cm block of concrete with a mass of 1.82 kg that is submerged under water.
  51. physics

    what pressure would you expect if the gas in the flask were heated to 150 degrees celsius?
  52. physics

    A boy hops on his bike and rides 135 meters in 20 seconds. What is his average speed?
  53. physics

    A boy hops on his bike and rides 135 meters in 20 seconds. What is his average speed?
  54. physics

    Find the constant acceleration of a particle whose velocity changes by 3.06 m/s every 0.093 s.
  55. 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
  56. physics

    what net force is needed to accelerate a 2.0kg mass from rest to a velocity of 10m/s in 5.0s
  57. physics

    Describe in detail an experiment to find out the half life of a radioactive material
  58. Physics

    How long does it take light traveling from the sun at 3.0 x 10^8 m/s to reach Jupiter, which is 780 x 10^6 km away?
  59. physics

    what force is necessary to stop a 20 g bullet moving at 200 m/s as it penetrates a wood at a distance of 4 m?
  60. Physics

    A nurse counts 76 heartbeats in one minute. What are the period and frequency of the heart's oscillations?
  61. Physics

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

    How long does it take a motor cyclist to come to rest?which travels at 12m/s decelerates at 3m/s^2
  63. physics

    This isn't so much a question, but a query: What does this mean? K.E. = 1/2 mv2 I can do the homework on my own if someone lets me know. Thanks.
  64. physics

    what is the greatest acceleration can be generated by a runner if coefficient of friction between shoes and road is 0.95
  65. 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
  66. PHYSICS

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

    Under what conditions would an applied force increase the Kinetic energy of an object?
  68. physics

    explain why a child on a swing comes to rest directly below the top of the swinng
  69. Physics

    If a shoe is dropped from a height of 40m, what is its speed after falling for two seconds?
  70. Physics

    Calculate the gravitational force between two identical 100-kg masses separated by 1 m.
  71. physics

    how much force can be applied to the top block without the blocks slipping apart
  72. physics

    how much force can be applied to the top block without the blocks slipping apart
  73. physics

    I am moving 3 blocks with a force of 3 newtons over a distance of 1 meter in 10 seconds. What is the power?
  74. Physics

    Using volume of a sphere, calculate the average density of Saturn (radius = 60,268 km).
  75. physics

    How far does a point on the circumference travel if the wheel is rotated through an angle of 26.2 rev?
  76. Physics

    Why do we see more mirages in southern states and in the summer than at other times or places
  77. physics

    What is the period and frequency of a 10-pound weight oscillating (as a pendulum) on a 5-meter-long rope?
  78. Physics

    Roads seldom go straight up a mountain, they wind back and forth. Explain why this is useful
  79. Physics

    What is the instantaneous speed 3 seconds into the journey of a car traveling at a constant velocity of 10 m/ s?
  80. Physics

    Find the velocity of microwaves having wavelength of 0.75m and frequency 2.75X10^10hz
  81. physics

    Your friend of mass 80 kg can just barely float in freshwater.Calculate her approximate volume.
  82. Physics

    A Brass rod 50.0 cm long expands 0.0734 cm when heated. Find the temperature change.
  83. physics

    What is the density of nitrogen gas (molecular mass = 28 u) at a pressure of 1.2 atmospheres and a temperature of 284 K?
  84. Physics

    Why is it that interference effects don't show up regularly in glass window panes with two surfaces?
  85. physics ! HELP PLEASE !!!!1

    what are the methods of computing the veolicty of a particle in one- dimensona motion from a graph ?
  86. physics

    What is the minimum work in joules needed to push a 1540 kg car 44.0 m up a 12.5 degree incline?
  87. 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?
  88. physics - help !!!!!!!!

    The magnitude of a vector is always : - a positive number - greater than 1 - an integer - none of the above. Thank you
  89. physics

    The magnitude of a vector is always : - a positive number - greater than 1 - an integer - none of the above.
  90. physics

    Calculate the internal energy of 25.0 g of low-density oxygen gas (O2) at a temperature of 255 K.
  91. physics

    define black body, emissivity, solar constant in relation to heat transfer.
  92. Physics

    If a car delivers 76.2 hp of power, how much time will it take for the engine to do 5.78e5 J of work?
  93. physics

    Which of the following is forward biased? (i canna draw so plz manage wid dis) (0V)-------pn-------(-2V) (-4V)-------pn-------(-3V) (-2V)-------pn-------(2V) (3V)-------pn-------(5V)
  94. physics

    a gun shoots a potato from a height of 6 feet. how long does it take to hit the ground.
  95. Physics 30

    If a truck moving at 30km/hr accelerates at 2.5m/s^2 to 50 km/hr, what time (in sec) does it take? a. 2.22s b. 5.56s c. 8 s d. 28.8s
  96. physics

    how much torque do you exert if you push perpendicularly on a door with a force of 30 N at a distance of 0.85 m from its hinges
  97. physics

    what force must the woman in Figure 3.38 exert on the floor with her hands in order to do a pushup?
  98. Physics HELP!!

    What is the de Broglie wavelength of an electron that strikes the back of the face of a TV screen at 1/10 the speed of light?
  99. 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?
  100. PHYSICS

    A car speeds up at 5m/s if the driver was already moving at 7m/s find his velocity after 3 seconds
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