Math/Physics

214,413 results, page 70

  1. Physics

    Show that 480 W of power is expended by a weightlifter when lifting a 60-kg barbell a vertical distance of 1.2 m in a time interval of 1.5 s.
  2. physics

    A trolley while going down an inclined plane has an acceleration of 2 cm/s2.What will be the velocity 3 secs after its start?
  3. 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?
  4. Intro to Physics

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

    A commuter backs her car out of her garage with an acceleration of 1.6 m/s2. How long does it take her to reach a speed of 2.3 m/s in seconds
  6. physics

    A boy sledding down a hill accelerates at 1.20 m/s2. If he started from rest, in what distance would he reach a speed of 7.00 m/s?
  7. physics

    A boy sledding down a hill accelerates at 1.20 m/s2. If he started from rest, in what distance would he reach a speed of 7.00 m/s?
  8. Physics

    A boy sledding down a hill accelerates at 1.55 m/s2. If he started from rest, in what distance would he reach a speed of 6.90 m/s?
  9. physics

    if a ball is tossed from ground level upward at a speed of 44 m/s how long will it take to reach its maximum height
  10. physics

    A car comes to rest uniform deceleration at the rate of 5.8 m/s2 for 14.3 seconds. What is distance did it travel during this time??
  11. Physics

    It takes you 10min to walk with an average velocity of 1.2m/s to the north from the bus stop to the restaurant entrance. What is your displacement?
  12. Physics

    How long does it take T-Rex to reach its food 200m away assuming that he starts from rest and accelerates at 4.00 m/s2?
  13. Physics

    Show that 480 W of power is expended by a weightlifter when lifting a 60-kg barbell a vertical distance of 1.2 m in a time interval of 1.5 s.
  14. physics

    if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
  15. physics

    if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
  16. physics

    if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
  17. Physics

    Problem 3- If a bug can jump straight up to a height of 0.5 m. a) what is its initial speed as it leaves the ground? b) How long is it in the air?
  18. physics

    A 4.00kg kg bucket of water is accelerated upward by a cord of negligible mass whose breaking strength is 73.0N N .
  19. physics

    Forces of 9.93 N and 1.23 N act at right angles on a reddish-green block of mass 3.02 kg. How much acceleration occurs?
  20. physics

    What maximum height will a 318.3 m driver each if it is launched at an angle of 17.0 tothe ground? The acceleration due to gravityis 9.81 m/s2.
  21. physics

    A flower pot with a mass of 3.8kg is hanging by 2 wires that make an angle of 48° from the horizontal. what is the tension in each wire?
  22. physics

    A flower pot with a mass of 3.8kg is hanging by 2 wires that make an angle of 48° from the horizontal. what is the tension in each wire
  23. physics

    A merry-go-round makes 23 revolutions in a 2.8min ride. Part A What is its average angular speed in rad/s?
  24. Physics

    the 8kg mass of an object moves in a distance of radius 10cm at 15m^2.calculate the angular velocity
  25. PHYSICS

    What's the total mechanical energy of a 300kg satellite in circular orbit 1400km above Earth's surface?
  26. Physics

    How much force is needed to hold a nearly weightless but rigid 1-L carton beneath the surface of water?
  27. physics

    Find the distance by which a 42cm diameter, 9.4m tall concrete column is compressed when it supports a 12900kg load
  28. physics

    if a teacher wanted to demonstrate mass in the classroom, which of the following objects should she use? a ruler or an eraser
  29. 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?
  30. Physics

    Why do some cooks put ice in the pot to cook meat? Explain then prove your answer by solution.
  31. Physics

    Why is an ice cube at 0°C more effective in cooling soft drink than the same mass of water at0°C?
  32. Physics

    Why do some cooks put ice in the pot to cook meat? Explain then prove your answer by solution?
  33. Physics

    A copper ball 2 cm in radius is heated in a furnace to 400 degree celsius. if its emissivity is 0.3, at what rate does it radiates?
  34. PHYSICS

    Name and discuss the levels of organization in a multicellular organism starting from the basic unit or structure of life.
  35. physics

    A 0.0400 kg ice cube at -30.0°C is placed in 0.400 kg of 35.0°C water in a very well insulated container. What is the final temperature?
  36. Physics

    Consider the static equilibrium diagram below. What is the net force acting along the positive x-axis?
  37. physics

    An 87.0 kg fullback moving east with a speed of 5.0 m/s is tackled by a 83.0 kg opponent running west at 2.92 m/s, and the collision is perfectly inelastic.
  38. Physics

    suppose you have 3 resistors, each of value 0f 30 omega. List all the different resistances that you can obtain by combining them
  39. Physics

    Another pendulum swings to and fro at a regular rate of two times per second. Show that its period is 0.5 s.
  40. physics

    Eight charges (50μC each) are arranged on the corners of a cube side length 1 cm. What is the magnitude of the force on each charge in Newtons?
  41. PHYSICS(HELP)

    Eight charges (50μC each) are arranged on the corners of a cube side length 1 cm. What is the magnitude of the force on each charge in Newtons?
  42. Physics

    If a current is flowing with a value of 5.9 A, how much electron charge passes any single point in 25 seconds? A) 1.9 x 1020 e
  43. Physics

    Please help! 400 calories of heat are added to 40grams of water at 20celcius . What's the final temp reached ?
  44. Physics

    An object is dropped from a platform100 ft high. Ignoring wind resistance, how long will it take to reach the ground?
  45. Physics

    How much momentum does a .01 kg ping pong ball have if it is traveling at 25 miles/hour? (1.609km=1 mile)
  46. Physics

    How much momentum does a .01 kg ping pong ball have if it is traveling at 25 miles/hour? (1.609km=1 mile)
  47. physics

    Calculate the pressure exerted on the floor by the heel if it has an area of 1.45 cm2 and the woman's mass is 58.0 kg. Express the force in N/m2 and lb/in
  48. physics

    the work function of zinc is 3.6ev what is maximum enegy photoelectron by ultraviolet wave of light 3000angstrome
  49. Physics

    we have to transpose the following equation to find p, but I don't quite understand how to come up with the correct answer: x^2/p^2 + y^2/q^2 = 1 Appreciate help, thanks
  50. physics

    A.Use newtons first law to explain why whiplash occurs? B.why are cars fitted with head rests?
  51. algebra based physics

    Two protons in a nucleus are separated by 8.0×10−15m . What's the potential energy of the pair?
  52. Physics

    A 2473 kg elephant is walking at 3 m/s on a flat surface. How much kinetic energy does he have? Answer in Joules or J
  53. Physics

    A 2473 kg elephant is walking at 3 m/s on a flat surface. How much kinetic energy does he have? Answer in Joules
  54. physics

    What is the maximum acceleration a car can undergo if the coefficient of static friction between the tires and the ground is 0.24? a_{max} =
  55. physics

    Explain in terms of the conservation of momentum why the ratio of the masses of a bullet and a gun must be carefully considered
  56. Physics

    what type of heat transfer does solar hot water heating use? (conduction, convection, radiation)
  57. Physics

    A traffic light is hanging from two cables tilted at 37 and 42 degrees. If it has a mass of 2.3 kg find the tension in each cable.
  58. physics

    A stone of mass m kg is held h metres above the floor 50s.The workdone in joules over this period is
  59. Physics

    How much pressure is exerted on a submarine at a depth of 8.50 km in the Pacific Ocean? (density of sea water = 1.025 x 10^3 kg/m3, P0 = 1.01 x 10^5 Pa)
  60. physics

    How many excess electrons are there in a typical lightning bolt that has about 16 C of charge? Answer 1 x 1020 1 x 1019 10 1 x 1016
  61. physics

    A 60 kg stunt person runs off a cliff at 5.3 m/s and lands safely in the river 11.8 m below. What was the splashdown speed?
  62. Physics

    design a pair of ear defenders and explain how they work using big idea of energy transfer
  63. physics

    Show that 480 W of power is expended by a weightlifter when lifting a 60-kg barbell a vertical distance of 1.2 m in a time interval of 1.5 s.
  64. physics

    a man walks 8km North and then 5km in a. direction 60degrees. find its distance from his starting point
  65. Physics

    Q1:Find the phase and group velocities of the de Broglie waves of an electron whose kinetic energy is 500kev?
  66. physics

    Calculate the average velocity for a remote controlled vehicle that starts with a speed of 1.0 m/s [forward] and then accelerates at 0.08 m/s2 [backward] for 4.0 s.
  67. physics

    Calculate the average velocity for a remote controlled vehicle that starts with a speed of 1.0 m/s [forward] and then accelerates at 0.08 m/s2 [backward] for 4.0 s.
  68. Physics

    Can someone explain the magnitude and direction of the acceleration of a ball moving upward, downward,and at the highest point? a=g
  69. PHYSICS

    the following data were obtained for the position of a ball as it rolled along a straight track DISPLACEMENT (CM) TIME 2.90 0.60 7.40 2.10 11.00 3.30 22.70 7.20 31.10 10.00
  70. PHYSICS

    he following data were obtained for the position of a ball as it rolled along a straight track DISPLACEMENT (CM) 2.90 7.40 11.00 22.70 31.10 TIME 0.60 2.10 3.30 7.20 10.00
  71. Basic Physics

    I don't understand how to work this problem out: Find x-component of vector a ⃗ = (7.0m/s 2 , - y-direction) Please help
  72. PHYSICS

    a 3000 N car is moving at 12.0m/s comes to a stop while skidding a distance of 25.0m. what is the coefficient of kinetic friction?
  73. PHYSICS

    a swimmer develops an average of 200 watts in a distance of 100m in 80 seconds. what is the force resistance in the water?
  74. physics

    an object is 25 cm from a concave mirror whose focal length is 50 cm where will the image be located how wil lthe solution be ?
  75. physics

    In a panic-stop, a car's brakes produced an acceleration of -8.0 m/s2 (or a deceleration of 8.0 m/s2). If you are traveling at 35 m/s, your speed after braking for 3.0 s will be
  76. physics

    a particuler moves along the sides AB,BC,CD of a square of side 25m with a speed of 15m/s. Its average velocity is?
  77. Physics

    A body travels from rest with acceleration 8m/s(squared)Find its velocity when it has covered a distance of 100 meter?
  78. Honors Physics

    Give some examples of applications that have resulted from work done by physicists on the exploration of space.
  79. physics

    Find the force when two poles to strength 100 and 90 cgs units are placed at a distance to 20 cm a part.
  80. physics

    power applied to a particle varies with times as p=3t^2-2t+1 Watt where t is in second. And the change in its kinetic energy b/w time t=2s t=4s
  81. physics

    A bus accelerates at 1.4 m/s2 from rest for 14 s. It then travels at constant speed for 23 s, after which it slows to a stop with an acceleration of magnitude 1.3 m/s2.
  82. physics

    A ball is thrown straight up with an initial speed of 60 m/s. How high does it go? Assume the accelera- tion of gravity is 10 m/s22
  83. physics

    A kangaroo jumps straight up to a vertical height of 1.19m, how long was it in the air before returning on earth
  84. physics

    A cauterizer, used to stop bleeding in surgery, puts out 2.30 mA at 14.0 kV. What is its power output? What is the resistance of the path?
  85. physics

    You're sailboarding at 6.1m/s when a wind gust hits, lasting 6.3s accelerating your board at 0.48m/s2 at a 35∘ to your original direction
  86. physics

    A baseball is thrown vertically upward with a speed of 17.8 m/s from a height of 1.11 m. How high does the ball rise from its original position?
  87. physics

    Two 2.5 kg physical science textbooks on a bookshelf are 0.25 m apart. What is the magnitude of the gravitational attraction between the books?
  88. Physics

    A loudspeaker emits energy equally in all directions at the rate of 1.75J/s. What is the intensity level at a distance of 15 m?
  89. physics

    compute the acceleration of a 1500-N block sliding down a 30 degrees incline. Assume friction is negligible
  90. Physics

    An FM radio station of frequency 107.7MHz puts out a signal of 50,000 W.How many photons/s are emitted?
  91. Physics

    An experimenter finds that no photo-electrons are emitted from tungsten unless the wavelength of light is less than 270nm.
  92. Physics

    An FM radio station of frequency 107.7MHz puts out a signal of 50,000W. How many photons/s are emitted?
  93. Physics

    An FM radio station of frequency 107.7MHz puts out a signal of 50,000W. How many photons/s are emitted?
  94. Physics

    A 20,000 kg vehicle is running at 80km/hr in a rotonda with a radius of curvature 25m compute for the centripetal force
  95. Physics-Intro

    Find the total force necessary to give a rocket of mass 25,000 slugs an acceleration of 28.0 ft/s2.
  96. Physics

    Forces of 9.5 N and 5.12 N act at right angles on a reddish-green block of mass 3.19 kg. How much acceleration occurs?
  97. physics

    Forces of 4.57 N and 4.74 N act at right angles on a reddish-green block of mass 5.76 kg. How much acceleration occurs?
  98. physics

    A particle of mass 10 kg is slowly lifted up to a height of 10 metre then calculate the workdone by external and gravity force ?
  99. physics

    Forces of 4.57 N and 4.74 N act at right angles on a reddish-green block of mass 5.76 kg. How much acceleration occurs?
  100. physics

    What force is necessary to keep a 2.00x10^3 car moving up a 15.0 degree incline at a constant velocity? (Mu=.200)
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