physics please HELP !

74,755 results, page 72
  1. TVTC

    Physics...a diver of mass m drops from a board of 10m above water surface. find his speed at 5m
  2. Physics

    Some hydrogen occupies 120 ft at 60.0°F. Find the temperature when its volume is 132ft^3 if the pressure remains constant.
  3. physics

    What is the take off speed of a locust if its launch at an angle of 60 and its range 88m. Also calculate the time of flight (g=10m)
  4. Physics

    How do I solve this question: What is the resistance of a laptop computer that has an 11V battery & requires 15W of power?
  5. physics

    Electric power is found by multiplying ___ by current. Is voltage or potential difference a better choice to use?
  6. physics

    Electric power is found by multiplying ___ by current. Is voltage or potential difference a better choice to use?
  7. Physics

    An 1800 kg helicopter rises with an upward acceleration of 2.0 m/s2. What lifting force is supplied by its rotating blades?
  8. Integrated Physics and Chemistry

    Energy that is dissipated during heat flow cannot usually be used to produce work. True False
  9. physics

    A block weighing 6.8 N requires a force of 2.9 N to push it along at constant velocity. What is the coefficient of friction for the surface?
  10. Physics

    An observer on Earth sees you travel 1000 m at half the speed of light. What distance do you think that you travelled?
  11. physics

    a boy with a mass of 60kg climbs a 10m vertially up a ladder. A) how far did he travel? B) how much work is done? C) what are the energy changes here?
  12. Physics

    Describe the structure of an atom, the quantised shell model and how it produces absorption and emission spectra.
  13. physics

    Two equal masses m are place at positions r©û= (L, 2L, 3L) and r©ü= (3L, L ,2L). Calculate the moments of inertia Ix, Iy, Iz of the system with respect to the x, y, and z axes.
  14. Physics 20

    A vehicle is involved in a collision that produces a -1500 n net force. what is the acceleration of the 75.5 kg passenger in the car?
  15. Physics

    a plane travels 5.0x10^2 m while being accelerated uniformly from rest at the rate of 5.0m/s^2. What final velocity does it attain?
  16. physics

    200g of steam at 110°C is condensed, and the resulting water is frozen into ice at 0°C. How much heat was removed?
  17. physics

    Marks: 2 Light cannot be linearly polarized by: Choose one answer. a. transmission b. reflection c. diffraction d. scattering
  18. physics

    What is the image distance of a 4 cm tall object placed 40 cm from a concave mirror having a focal length of 10 cm? Choose one answer. a. -13.3 cm b. 13.3 cm c. -40.0 cm d. 40.0 cm
  19. physics

    An object with a height of 12cm is placed 4cm in front of a concave mirror whose radius of curvature is 16cm.
  20. physics

    What is the magnitude of force required to accelerate a car of mass 1.7 × 10³ kilograms by 4.75 meters/secondÆ?
  21. Physics

    The length of wire is 25.5cm and it's radius is 1.02mm. Calculate the percentage error in mesurement of its volume
  22. physics

    a particle moving on a circlehas a velocity of m/s and normal acceleration of 10m/s2.determine the radius of the circle.
  23. Integrated Physics and Chemistry

    A furnace is used to heat ___ A)water B)air C)a refrigerant D)radiant coils
  24. Physics

    A golf ball is chipped at an angle of 49 degrees and with a speed of 8.5 m/s. How far does it travel to the nearest tenth of a meter?
  25. Physics

    if the body describes a vertical circle then the minimum velocity at angle theta from lowest position is
  26. Physics

    A body is thrown up with a velocity of 78.4m/s.find how height will with rise and how much time if it take to return its point of rejection?
  27. physics

    What is the mass of a lead sinker witha volume of 3cm3? please show work I calculated 11.3*3 = 33.9 Is this correct.. Thank you.
  28. Physics

    An object is executing circular orbits of radius 0.5 m. If it completes an orbit every 3 seconds, what is its tangential speed?
  29. Physics

    What is the repulsive electrical force between two protons in a nucleus that are 5 x 10^ -15 m apart from each other? Could you help me with this problem? I can't figure out how to do this. Use Coulomb's equation F= kQQ/r^2
  30. physics

    calculate the free electrons of a copper wire having a 0.064 inches diameter and 1000 ft. long?
  31. Physics

    Calculate  the  length  of  a  meter  stick  moving  with  a  speed  of  v  =  0.9995c  as  measured  by  an   observer  at  rest.
  32. physics

    Two point charges of magnitude +3.0 nC and +2.0 nC respectively are placed 2.0cm apart. Calculate the resultant electric field strength at their midpont E= E1 + E2
  33. physics

    if a ball is thrown vertically upward and is caught 5 seconds,how fast must have been going when it left the person s hand?help
  34. help fast ,( physics)

    What is the net electrostatic force on the charge q3 (-48ìC), due to charges q1(+78ìC) and q2 (+50ìC)?
  35. physics

    A beer is dropped from a window 30 m above the ground. How fast will it be moving just before it lands? (Neglect air resistance).
  36. Physics

    A girl of mass 25kg runs up a stress of total height 3.0m.find the work done against gravity.
  37. physics

    A 60kg boy climbs 70 fligts of stairs each 20cm high in one minute how much powers is developed?
  38. physics

    A ball is thrown upward with velocity 5m/s calculate total distance covered by it ?{ Using formulae (v)2 -(u)2. =2gs}
  39. Physics

    you are skiing down a slope angled at 30 degrees to the horizontal. Your acceleration is 2m/s^2. what is the coefficient of kinetic friction between you and the hill?
  40. Physics

    A block weighing 9.7 N requires a force of 2.6 N to push it along at constant velocity. What is the coefficient of friction for the surface?
  41. science(physics)

    the sum of three forces f1=100n, f2=80n, f3=60n acting on a particle is zero. The angle between f1 and f2 is: Please solve
  42. physics

    a stone is thrown vertically upward with an initial velocity v0. the distance travelled by it in time 1.5v0/g
  43. physics

    A body thrown vertically up from the ground passes the height 10.2m twice at an interval of 10 sec. Its initial velocity was (g = 10 m/s2)
  44. physics

    a stone is thrown vertically upward with an initial velocity v0. the distance travelled by it in time 1.5v0/g

    --------------A /l\ / 1 \ / 1 \ / 1 \ 1 B C the pendulum has a string of .075m. velocity at c is 3.83m/s how do i find the speed at point b when the angle of B and C is 37 degree
  46. *physics*

    what is the smallest time in which a 9.00kW motor can lift a 3500 kg elevator to a height of 9.50m? use 10m/s^2 as g.
  47. Physics

    You are skiing down a down a slope angled at 30o to the horizontal. You acceleration is 2 m/s2. What is the coefficient of kinetic friction between you and the hill?
  48. Physics

    A ball is thrown with a speed of 19m/s and at an angle of 46 degrees. How high does it go above the cliff to the nearest tenth?
  49. physics

    What amount of energy is used if 800 C of charge passing through a load with a potential difference of 120 v? answer is 9.6e+4
  50. physics

    the current through a meter movement is 150 micro amperes. what is the dc value if the instrument uses half-wave rectification?
  51. hi

    Find the book's acceleration (positive for up, negative for down). .... physics An object with mass m = 20 kg is released from a height h = 60 m above the ground.
  52. physics

    What is the net force on a Mercedes convertible traveling along a straight road at a steady speed of 100km/h?
  53. physics

    determine the center of mass for three particles(1.5, 2.5, 3.5) forming a equilateral triangle one side lenght of 135cm.
  54. physics

    A tennis ball is thrown directly upward with an initial speed of 25 m/s. What is its velocity in m/s when it hits the ground?
  55. Physics

    Two point charges that have charge values of 4.0 X 10^-6 C and -8.0 X 10^-6 C, respectively, are separated by 2.4 X 10^-2 m. What is the mutual force between them, given that kC = 8.99 X 10^9 Nm^2/C^2? I got the Felectric as -5.0 X 10^2 N, but I'm not sure
  56. Physics

    An object is dropped from rest. What is its instantaneous speed when it has been in motion for 5 s? The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s
  57. physics

    A ball initially at rest rolls down a hill with an acceleration of 2.7 m/s2. If it accelerates for 8.1 s, how far will it move? Answer in units of m.
  58. physics

    How do you draw a force diagram for an object that is tied to a pole and is moving in a constant circular direction?
  59. physics

    I have do a project on graphical methods representing vector quantities with 5 examples and graphs. Please let me know where will I get the required info.

    a stone of mass 0.5kg is drop from a height of 12m. calculate; it's kinetic energy. (g=10m/s2).
  61. physics

    a man weighing 500N runs up a staircase half a minute he rise up by 4m. a.what work did he do? b.what was his power?
  62. physics

    a car of mass 800kg attains a speed of 25m/s in a second.calculate the power developed in the engine
  63. physics

    A centrifuge accelerates uniformly from rest to 18000 rpm in 180 s. Through how many revolutions did it turn in this time?
  64. Physics

    Two objects attract each other gravitationally with a force of 2.3×10−10 when they are 0.21 apart. Their total mass is 4.50 . Find their individual masses.
  65. Physics

    A stopped 100okg car exerts 160kW of power as it accelerate. If it is only 75% efficient, how far will it travel in 4 seconds?
  66. Physics

    If the coefficient of kinetic friction is 0.24, how much work do you do when you slide a 55 kg box at constant speed across a 5.4 m -wide room?
  67. Physics

    Your friend doesn't believe you when you tell her that the acceleration due to gravity on earth is the same for both light and heavy objects. How could you convince her?
  68. physics

    Calculate the speed of a satellite moving in a stable circular orbit about the Earth at a height of 3.004km.
  69. physics

    Calculate the speed at the edge of a disc of radius 4 cm that rotates at the rate of 8 rev/s. Answer in units of m/s.
  70. physics

    While running a race, Abigail’s heart was beating at 170 beats per minute. What was the period of her heartbeat?
  71. Physics

    A stone is thrown vertically upward, after't'second it covers a distance of's' metre, where 's'=80t-16t2. It's velocity after 2 second?
  72. Physics

    Find the speed of a pendulum bob at the bottom of its swing if its initial displacement is 5 degrees and its period is 2 s.
  73. Physics

    What is the change in momentum for a 5,000 kg ship in outer space that experiences no net force over a 1 hr period?
  74. physics

    What force must be exerted on a car of mass 1825 kilograms in order to make it accelerate at 26 meters per second per second?
  75. Physics

    The established value for the speed of light in a vacuum is 299 792 458 m/s. What is the order-of-magnitude of this number?
  76. Physics

    Two objects, each with a charge of +3·10-6 C, are located 7 m apart. What is the electric force between them? Use coulombs equation: I will be happy to critique your work.
  77. physics

    3. If a man does 300 j or work by pushing a table 2.0 m across the room, what was the magnitude of the applied horizontal force?
  78. physics

    a box is thrown upwards with a velocity of 8m/s and takes 2seconds to reach its maximum high does it go up
  79. Physics

    If you tried to smuggle gold bricks by filling your backpack, whose dimensions are 55cm* 30cm *16cm , what would its mass be?
  80. physics

    A projectile is fired in such a way that its horizontal range is equal to 8.5 times its maximum height. What is the angle of projection?
  81. Physics

    Two objects attract each other gravitationally with a force of 2.7×10−10 when they are 0.65 apart. Their total mass is 4.4 Find their individual masses.
  82. physics

    An egg falls from rest atop a 15-m tall tree. Show that it takes 1.7s for it to hit the ground below.
  83. Physics

    The voltage across a lamp is (6.0 +_ 0.1) V and the current flowing through it is (4.0 +_ 0.2) A. Find the power consumed with maximum permissible error in it?
  84. physics

    How close must two 1.0 C charged objects be for their mutual force to exceed 1.0 N? Compare that distance to something in your everyday life.
  85. Physics-Please help

    Could someone provide me with a simple explanation of how the Doppler Effect is used to determine the speed and direction of moving object
  86. physics

    How would you determine the value of the specific latent heat of steam in the laboratory? What precautions are necessary to obtain an accurate results
  87. physics

    Explain the statement: the saturation vapour pressure of water at 60 degree Celsius is 149.4 mm of Mercury. Thanks
  88. Physics-Could someone please help me?

    Could someone provide me with a simple explanation of how the Doppler Effect is used to determine the speed and direction of moving object
  89. Physics

    How fast (in rpm ) must a centrifuge rotate if a particle 8.00 from the axis of rotation is to experience an acceleration of 117000g's?
  90. Physics

    How many calories are absorbed by a copper spoon with a mass of 200 grams as it changes from 28°C to 33°C? A) 0.00027 B) 3 C) 90 D) 13,000 And this one. How do i solve this one?
  91. physics

    A motorbike accelerates uniformly at 0.6m.s for 10s. If it covers a distance of 500m. During this time, what was its initial velocity?
  92. College Physics

    how much work is required to completely separate two charges (each -1.4 microcoulombs) and leave them at rest if they were initially 8 mm apart?
  93. Physics

    Find the number of revolutions of a bicycle wheel of diameter 0.7m when the bike goes a distance of 22m down the street.
  94. physics

    1. At what distance above the Earth (mass of 5.97 x 1024 kg and radius of 6.38 x 106 m) would a satellite have a period of 125 min?
  95. grade 9 physics

    A runner jogs 12km North then turns and runs 16km East three hours
  96. Physics

    Which object produces energy in the form of light? A Venus B the sun C the moon*** D Halley’s comet I think it is C, but I'm not sure!
  97. Physics

    What is the power of engine that pulls a 1000 kg automobile at a steady speed of 10 m/sec along a level road?
  98. physics

    how can i plan and design a lab to investigate how electric current causes contraction of a spiral wire spring
  99. physics

    a boy travel 5km east and then12 km south.calculate his displacement from starting point.
  100. Physics

    What is the force needed to start a 100 kg block sliding on a horizontal if the coefficients for static and kinetic are 0.75 and 0.5