physics please HELP !

74,672 results, page 66

  1. Mimi

    post your thinking, or what is confusing to you on your chem/physics questions. I am not much of an answer giver. I do critique well.
  2. Physics

    Calculate how much energy is stored in a 17μF capacitor when it is charged to a potential difference of 200 V
  3. Physics

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

    at time t=0 the driver starts to brae determine how long the bus takes to stop
  5. Physics

    C:\Users\100622325\Desktop\1.jpg Given the figure above, if a = 5.53 cm and b = 4.15 cm, what would be the force (both magnitude and direction) on the 5.0 nC charge?
  6. Physics

    How many calories of heat will a person lose by evaporating 1250g of water and perspiration in a day?
  7. 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
  8. physics

    Consider two charges, where one (+1.90 nC) is at the origin and the other (-3.61 nC) is at the position x = 4.35 cm. Find the x-coordinate where a proton would experience zero net force.
  9. 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?
  10. Physics

    Can anyone help? the resistance of the side lights on an automobile are 10 ohms. How much current flows in them when connected to 12 volts
  11. Physics

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

    Our eyes are sensitive to electromagnetic radiation with wavelengths from 400nm to 700nm. What is associated range of frequencies?
  13. physics

    a block of wood of 200g is thrown vetically with a veloncity of 20mls what is the pontential energy?
  14. physics

    true or false: according to einstein, a gravitational field is equivalent to an accelerating frame of reference.
  15. applied physics

    Calculate the magnitude of the torque produced by two 25N forces that are 3m apart and in opposite directions
  16. physics

    show the expression v=at is dimensionally correct where v represents speed an acceleration and t is instant time?
  17. Physics

    When you swim across a river does the time it takes to get to the other side depend on the rate of flow of the water?
  18. Physics

    the co efficient of friction of a plane inclined at 30 degree is 0.4 . Then the acceleration of the body sliding freely on it is?
  19. Physics

    How can you easily increase the magnetic field strength inside a current-carrying coil? Could someone help?
  20. Physics

    An object 6.70 cm high is placed 15.1 cm in front of a convex mirror with radius of curvature of 8.55 cm. Where is the image formed?
  21. physics URGENT

    3. Using conceptual meaning of g = Fg/m [N/kg], answer the following: a) What does the spring scale read on the surface of the Moon?
  22. physics

    A ball of mass xg is release from a height of 20m . Calculate the time taken to fall to the ground.
  23. physics

    A ball of mass xg is release from a height of 20m . Calculate the time taken to fall to the ground.
  24. Physics

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

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

    If a man weighs 853.0 N on Earth, what would he weigh on Jupiter where the acceleration due to gravity is 25.4 m/s2?
  27. College Physics

    An electron and a proton are a distance r = 8.5 × 10-9 m apart. How much energy is required to increase their separation by a factor of 6?
  28. 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?
  29. 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%?
  30. Physics

    In the Theory of Special Relativity, the momentum of a massless particle is equal to which of the following? A. m0c^2 B. E2c^2 C. E/c D. E/c^2
  31. 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?
  32. Physics

    In the Theory of Special Relativity, the momentum of a massless particle is equal to which of the following? A. m0c^2 B. E2c^2 C. E/c D. E/c^2
  33. 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.
  34. principles of physics

    Blood pressure is normally greater in your ____________________. A) arms.B) legs.C) head.D) feet.E) All the same
  35. physics

    Calculate the speed of sound wave in air if its frequencies and wavelengths are 256Hz and 1.32m
  36. 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?
  37. physics

    A motorcyclist increases her speed along a straight road from 0 to 120 km/hr in 5 seconds. How much acceleration does she experience
  38. Physics

    A 6.25 kg solid ball with a radius of 0.185 m rolls without slipping at 3.55 m/s. What is its total kinetic energy?
  39. physics

    object kicked at 45 degree and travels 82 m b4 hitting the ground. what was its vo? how long was it in the air? how high did it go? please and thanks
  40. Physics

    i have to build a enery effiecient vehicle for class and do a opapp paper and i need help im so confused.... any ideas?
  41. 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?
  42. Physics

    Two electrons are fixed 2.99 cm apart. Another electron is shot from infinity and stops midway between the two. What is its initial speed?
  43. 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?
  44. Physics

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

    What exerts the force obn a rocket in outer space to make it move forward?
  46. 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?
  47. Physics

    Two charges each of 40 microcoulomb are placed at a distance of 0.4 M. calculate the potential at the midpoint. Dielectric constant of the medium is 2.
  48. 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?
  49. physics

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

    A 6.0 Kg object undergoes an acceleration of 2.o m/s squared. what is the magnitude of the net external force acting on it?
  51. Physics

    A,B,C,D are four charges placed at each corner of a square, with A= -6.00 mC , B=6.00 mC, C=-6.00 mC and D=6.00 mC.ALso AB=BC=CD=DA=0.100 m.Determine the magnitude and direction of force on each charge.
  52. Physics

    A record has an angular speed of 47 rev/min. Through what angle does it rotate in 1.07 s? Answer in units of ra
  53. Physics

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

    A driver drives 2.5 hours at an average speed of 48MPH. What distance does she travel in this time?
  55. physics

    A driver drives 2.5 hours at an average speed of 48MPH. What distance does she travel in this time?
  56. Physics

    Two protons, an infinite distance apart are brought together to a separation of 1 nm. What is the initial potential energy of the system?
  57. physics

    A force of 291.0 N is used to push a 140 kg mass 30.0 m horizontally in 3.00 s. Calculate the power developed in kW.
  58. 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?
  59. 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
  60. physics

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

    Frequency and period are related, in that they are which of the following?A) inverses of each other.B) None of these.C) both on the same wavelength.D) directly proportional to each other.E) two expressions for much the same thing.
  62. physics

    An object is to be thrown through a window 3.5 m high a distance 7.5 m away. It is launched at an angle 70 degreesabove the horizontal.
  63. physics

    A passengers jet flies from one airport to another 1,200 miles away in 2.5h .Find its average speed.
  64. 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!
  65. physics.pls help

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

    How much force is needed to bring a 3200 lb car from rest to a velocity of 44 ft/s in 8 seconds? Please indicate the formula used.
  67. physics

    How long does it take a rocket to change its velocity by 57 m/s while accelerating at 53.7 m/s2? Round your answer to 2 decimal places.
  68. Physics

    Two negatively-charged bodies with -5.4e-5 C are 0.20 m from each other. What force acts on each particle? F=kqq/d^2 F=(9.0e9)(q)(q)/(.20^2) Would both q's equal -5.4e-5 C?
  69. physics

    What is the force required to move a 22kg ccrate up an incline of 35 degrees, if the coefficient between the two surfaces is .30?
  70. physics

    what is the heat required to convert 0.1 kg of melting ice into steam at 100 degree celcius
  71. Physics

    How long will it take a 1830 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
  72. physics

    An object is projected at an angle of elevation of 45 degree with a velocity of 100 m/s calculate its range
  73. Physics.

    when an e- and a positron collide they're annihlated and their mass converts to engery. the energy released is? [1.64x10^-13 J]
  74. Physics

    An object is thrown vertically upward with a speed of 31.8 m/s. How long does it take to reach this highest altitude?
  75. 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
  76. physics

    Explain how an object can orbit a planet & why astronauts float around in the orbiting space shuttle
  77. Physics

    Two spherical objects with a mass of 7.60 kg each are placed at a distance of 2.93 m apart. How many electrons need to leave each object so that the net force between them becomes zero?

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

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

    a body starting from rest attains a speed of 8 m/s in 2 seconds. find the acceleration of the car.
  81. physicS

    What is the longest wavelength for standing waves on a 238.0 cm long string that is fixed at both ends?
  82. physics

    How fast must you lift a 3.60 kg container of milk if the power output of your arm is to be 21.3 W? how would i approach this question? would i still use P=W/T?
  83. physics

    For which of these will the buoyant force be the same as its weight when placed in water? A) A match stick.B) All of these.C) A small rock.D) None of these.E) A nail.
  84. physics

    What is the longest wavelength for standing waves on a 238.0 cm long string that is fixed at both ends?
  85. physics

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

    two forces of magnitude 8N making an angle of 30 and 120 with +xaxis . FInd the y component of reultant
  87. physics

    A stone is thrown straight up. To reach a height of 6.74 m above its release point, what must its initial speed be in m/s
  88. physics

    on a planet whose mass is twice that of earth and whose radius is same, with what acceleration will a body fall at sea level?
  89. 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?
  90. Physics

    What is the gravitational force between the proton (1.67X10^-27 kg) and the electron (9.11X 10^-31 kg) in a hydrogen atom if they are 3.00X10^-10 m apart?
  91. Physics

    Find the electric potential at the centre of the square of side 1m at the four corners of charges of q1, q2,q3,and q4 are placed having values 3×10^-8C,-3×10^-8C,-5×10^-8C and 6×10^-8C respectively.
  92. 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?

    A pebble is tossed off a skyscraper and reaches the groung 7.65 seconds later. How tall is this building? 7.65 s x 9.8 m/s^2 = 74.97 meters????? Not sure if I did this right? Thanks
  94. Intro to Physics

    With scanning probe microscopy technology, we see not actual atoms but rather images of them. Explain.
  95. Physics

    A cricket jumps vertically upwards, and remains in the air for 1.6 s. At what speed did it leave the ground?
  96. physics

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

    What mass of ice at -14°C will be needed to cool 200cm³ of an orange drink(essentially water) from 25°C to 10°C?
  98. physics

    a racing car has a uniform acceleration of 4ms-2. what distances will it cover in 10s after start?
  99. physics

    Two equal point charges of +3.00 * 10^ -6 C are placed 0.200 m apart. What are the magnitude and direction of the force each charge exerts on the other?
  100. physics

    If a man weighs 853.0 N on Earth, what would he weigh on Jupiter where the acceleration due to gravity is 25.4 m/s2?
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