Math/Physics

215,876 results, page 69
  1. physics

    A body immersed in liquid has an upthrust of 140N with a density of 12kg calculate the velocity
  2. physics

    In a red glass filter, of the colors that make up white light, which if any are reflected or absorbed?
  3. Physics

    Calculate the length of a displaced pendulum Bob which pass through its lowest point twice every second. Take g=10m/s²
  4. Physics 2

    What quantity of heat is needed to convert 1kg of ice at -10C to liquid at 20C?
  5. Physics

    If a bullet was fired straight up at a speed of 30 m/s, what would be the total time for it to return to its starting point?
  6. Physics

    How much time does it take for a car to come to rest if it has an initial speed of 22m/s and slows with a deceleration of 6.1 m/s^2 Will my answer be 3.6 m/s^2
  7. physics

    A skater is gliding along the ice at 2.2 , when she undergoes an acceleration of magnitude 1.2 for 3.0 . At the end of that time she is moving at 5.8
  8. physics

    Calculate the speed of sound wave in air if its frequencies and wavelengths are 256Hz and 1.32m
  9. Physics

    Let F1=10i-15j-20k,F2=6i+8j-12k. Find their dot product and the angle between those two vectors
  10. physics

    a football is kicke with a velocity of 20 m/s at an angle of 40 degrees with the ground. Find the components. Key: 4 m/s = 1 cm
  11. physics

    WHAT IS THE REASON BEHIND THE JISKHA"S TEACHERS TO BE NOTHING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!(except Writeacher and STEVE) ARE THEY DAFT OR NUISANCE!!!!!!!!!!!!!!!!!! ANSWWER Me QUICKLY !!!!!!!!!!!!!
  12. physics

    At 7.15 cents per kilowatt-hour, what does it cost to leave a 75.0W light burning 24.0 hours a day?
  13. PHYSICS

    Tin melts at 232 under standard atmospheric pressure. Express this temperature in kelvin
  14. 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?
  15. physics

    Calculate the extension that would be produced by a 20N force if 15N extends a spring by 3cm
  16. Physics

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

    Calculate the skid-to-stop of a car travelling oa a road at 100km/h with a coefficient of friction of 0.68.
  18. physics

    Find the work done by 2.32 moles of an ideal gas if its volume doubles at a constant temperature of 22.6°C.
  19. 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?
  20. Physics Please

    You want to show that V^2 - Vo^2 = 2 a (X - Xo) first rewrite that as: (V-Vo)(V+Vo) = 2a (X-Xo) now your average velocity during the interval = (V+Vo)/2 so X = Xo + t(V+Vo)/2 but V = Vo + a t so t = (V-Vo)/a so X = Xo +(V-Vo)(V+Vo)/2a we are there.
  21. physics

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

    What frequency would you need to produce a sound wave in room-temperature air with a wavelength of 9 m? the answer in Hz
  23. physics

    If wind blows at 44 m/s over a house, what is the net force on the roof if its area is 180 m^2 and is flat?
  24. science physics

    i don't get how to solve this please help me Two resistors, 47 Ù and 82 Ù, are connected in series across a 45 V battery. What is the current in the circuit?
  25. science (physics)

    A projectileis given an initial velocity of icap + 2jcap . The catesian equation of its path
  26. science (physics)

    A projectileis given an initial velocity of icap + 2jcap . The catesian equation of its path
  27. physics

    Consider the motion of the tip of the minute hand of a clock. In one hour, the displacement and average velocity is .......
  28. physics

    A cars starts from rest and after 20 seconds its velocity becomes 108 km-1 find the acceleration of the car
  29. physics

    suppose you apply 3 newtons of force to slide a box 2 meters in 6 seconds, how much work did you do?
  30. Physics

    Calculate the speed with which a swimmer enters water if she slides down a frictionless ramp that is 2.6 m high
  31. 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
  32. physics

    vector b has x,y, and z components of 4.0, 6.0, and 3.0 units, respectively. Calculate the magnitude of b and the angles that b makes with the coordinate axes.
  33. Physics

    What is the de Broglie wavelength of an electron that strikes the back of the face of a TV screen at 1/9 the speed of light?
  34. physics

    if the shortest lenght of the tube for resonance is 0.1m and next resonanc length is 0.35m what is the frequency of the vibration.
  35. physics

    If a race car completes a 2.8 mi oval track in 41 s, what is its average speed? Answer in units of mi/h
  36. 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??
  37. physics

    An airplane travels at 144 km/h toward the northeast. What is the northern component of its ve- locity? Answer in units of km/h.
  38. Physics

    At highway speeds, a particular automobile is capable of an acceleration of about 1.52 m/s2. At this rate, how long does it take to accelerate from 74.0 km/h to 104.0 km/h? (in s)
  39. physics

    "If you have an inductor that has an inductive reactance of 125 ohms, on a 60Hz frequency, what would be the inductance in henry's?"
  40. Physics

    What is the frictional force between the tires of a 2000 kg car and an asphalt road if the coefficient of friction is 1.2?
  41. physics

    The boats have a mass of 30 kg. The stopping splash lasted about 1.5 s. What acceleration is required to stop the flume?
  42. PHYSICS ROLLING MOTION!!!

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

    Efficiency of a single fixed pulley is 85%.what effort is needed to lift a load of 85kgf using it?
  44. physics

    Which of the following physical properties can be used to measure temperature using a thermometer? A)volume B)pressure C)density D)viscosity I got A
  45. physics

    How much potential energy does DeAnna with a mass 57.0 kg, gain when he climbs a gymnasium rope a distance of 3.7 m?
  46. Physics

    What is the frictional force between the tires of a 2000 kg car and an asphalt road if the coefficient of friction is 1.2?
  47. Physics

    What is the centripetal acceleration of a skater moving with a tangential speed of 2.0 m/s in a circular path with radius 2.0 m?
  48. 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
  49. physics

    For a simple 15 upward ramp, what length would be needed for a runaway truck traveling 140 ?
  50. Physics

    What equations should I use to calculate the effective value of g, the acceleration of gravity (in meters/second^2), at 5800 km above the earth's surface?
  51. Physics

    what is the purpose of the double bell jars that surround the international prototype of the kilogram in Paris?
  52. Physics

    If a bullet was fired straight up at a speed of 30 m/s what would be the total time for it to return to its starting point?
  53. physics

    A 2000-kg car starts from rest and gains a velocity of 20 m/s in 5 /0s. What force was applied on it? What formula/s will I use?!
  54. physics

    Written in scientific notation, with three significant digits, the number 0.01050 is_______?______ x 10?
  55. Physics

    What is the efficiency of a crane that used current of 8A at 150V to raise 450kg load at the rate of every minutes?
  56. Physics

    The truck of a passenger car applies brakes at a velocity of 30 m/s and comes to rest 5 seconds later. What is the deceleration?
  57. Physics

    If a bullet was fired straight up at a speed of 30 m/s, what would be the total time for it to return to its starting point?
  58. physics

    The position of a particle moving along the x axis is given by x = (21 + 22t − 6t^2)m, where t is in s. What is the average velocity during the time interval t = 1s to t = 3s?
  59. 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
  60. Physics

    An iron railroad track 1000 feet long is at a temperature of 0 oC. How much does it expand when heated to 33 oC?
  61. physics

    What is the radius of an automobile tire that makes a complete turn in 0.1 sec and has a linear speed of 24.0 m/s?
  62. Physics

    If a bullet was fired straight up at a speed of 30 m/s, what would be the total time for it to return to its starting point?
  63. physics

    if a car moving 180km/h reduces to 72km, what is the percentage change in kinetic energy?
  64. physics

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

    A 2.73 kg particle has a velocity of vx = 6.02 m/s and vy = 0.316 m/s. Find the magnitude of its total momentum. Answer in units of kg · m/s
  66. Physics

    The electric field lines surrounding three charges are shown in the figure below. The center charge is q2 = -15.9 µC.
  67. physics

    two equal vectors of magnitude 2A are inclime perpendicular to each other find the resultant and direction of vector.
  68. physics

    what is the distance traveled by a vehicle in 12 minutes, if it's speed is 35km/h? And the answer I got was 7km but I got it wrong. Please help!
  69. physics

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

    A boy sliding down a frictionless plane inclined at an angles 35° with the horizontal. What is the acceleration of the book?
  71. physics

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

    If you stood atop a ladder that was so tall that you were twice as far from Earth's center, how would your weight compare with its present value?
  73. physics

    A helicopter blade spins at 110 revolutions per minute. Its tip is 5.50 m from the center of rotation.
  74. physics

    How much work does a refrigerator with a COP of 3.8 require to freeze 660 g of water already at its freezing point?
  75. physics

    If an 80kg sprinter can accelerate from a standing start to a speed of 10 m/s in 3s, what average power is generated
  76. Physics

    Using 3 – 4 sentences, explain, in your own words, two ways you could cause an electrical current using only a wire and a horseshoe magnet.
  77. physics

    A 4430-kg helicopter accelerates upward at 2.2 m/s2. What lift force is exerted by the air on the propellers?
  78. Physics

    The hamiltonian shows you that the energy levels are purtered by the electric fields.The form of the matrix,you can see?
  79. physics

    If your boat weighs 1400 N, how much water will it displace when it’s floating motionless at the surface of a lake?
  80. Physics

    An airplane from rest accelerates on a runway at 5.50 m/s² for 20:25 seconds until it finally takes off the ground. What is the acceleration before the take off?
  81. 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?
  82. physics

    A mango fruit drops from the top of it's tree which is 40 m. How long does it takes to reach the ground
  83. physics

    A mass of 1kg is placed at 1m,2m,0.Another mere of 2kg is placed at 3m,4m,0.Find moment of inertia of both the ladder about z-axis
  84. Physics

    A 16 kg box slides across the floor with an initial velocity of +7.8 m/s. It comes to a stop after sliding +14.6 m. How much friction was present?
  85. 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 6.10 m/s?
  86. physics

    A ball is thrown vertically upward with a velocity of 100m/s.It will reach the ground after hw many sec?
  87. Physics

    Two cars of same mass are moving with velocities v1 and v2 respectively. If they are stopped by supplying same breaking power in time t1 and t2 respectively then v1/v2 is?
  88. Physics

    Is this true or false? All objects moving in a circle are accelerated. I really don't uderstand this question.
  89. physics

    state the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS 6. +0.50 DS c. +1.75 DS
  90. physics

    a person throws a ball upward into the air with an initial velocity of 20.0 m/s, calculate how high it goes
  91. Physics

    is that right ideal gas only obey the boyles law under high temp and low pressure?
  92. Physics

    A golf ball struck with an initial speed of 41.8m/s. What is the range of the shot if the launch angle is 30.0º?
  93. 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?
  94. physics

    A flashlight that is powered by 12 Volts and uses a bulb with a resistance of 90 Omega will have a current _________________ Amps.
  95. Physics

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

    what is the central acceleration of an automobile driving at 40 kph on a circular tracks having radius of 30m?
  97. Physics

    In a hydrogen atom, if the radius of the orbit of the electron is doubled, then its energy will ... >> Increase by a factor of 2??
  98. 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?
  99. Physics

    Find the orbital velocity of a satellite orbiting 1800km above sea level in meters per second?
  100. physics

    A ball is thrown vertically upward with a speed of 27.6 m/s. How high does it rise? Answer in units of m.