Physics!

74,730 results, page 89
  1. physics

    When moving at highway speed, a Triumph America motorcycle is capable of accelerating at 2.1 m/s2. At this rate, how long does it take to accelerate from 103 km/h to 88 km/h?
  2. Physics

    if a baseball is thrown 30 m/s backwards from a truck moving 50 m/s, how fast will the ball strike the glove of a ground based catcher?
  3. physics

    Does anyone know what this is about? please help I would be more than grateful.. How does Rutherford’s model of the atom account for the back – scattering of alpha particles directed at the gold leaf
  4. Physics

    What is the difference in blood pressure (mm-Hg) between the top of the head and bottom of the feet of a 1.008 m-tall person standing vertically?
  5. physics

    An electric iron has a resistance of ohms. How much heat energy is produced in 10 minutes if the current passing through the device is 10 amps?
  6. physics

    2 ants cross a counter 54cm long, one travels at 16 meters per second, and the other at 3.99999 centimeters per second. when the first crosses the finish line how far behind is the second?
  7. physics

    2 ants cross a counter 54cm long, one travels at 16 meters per second, and the other at 3.99999 centimeters per second. when the first crosses the finish line how far behind is the second?
  8. College Physics

    A 0.30-m-radius automobile tire rotates how many radians after starting from rest and accelerating at a constant 2.0 rad/s^2 over a 5.0-s interval?
  9. physics

    Use the fact that the speed of light in a vacuum is about 3.00 108 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 4.9 hour(s)
  10. physics

    A car starts from rest and accelerates uniformly to a velocity of 8ft/s after traveling 250 ft. Find its acceleretaion. Help me with this pleeaase. Thank you.
  11. physics

    Most sphygmomanometers use mercury. How tall would the manometer tube need to be if it were filled with water instead? It might need to measure a blood pressure as high as 300 mm Hg.
  12. physics

    suppose a car travels at a constant 10m/s how far would it move in 1hr? in 1min? 1ms? could you please explain how i would solve this equation
  13. physics

    A electric model train travels at 0.339 m/s around a circular track of radius 1.75 m. How many revolutions does it perform per second, i.e, what is the motion's frequency?
  14. physics

    Imagine having an 80-turn coil with radius of 5.0 cm and resistance of 30 Ù. At what rate must a perpendicular magnetic field change to produce a current of 4.0 A?
  15. Physics

    The peak wavelength and observed color of a 50,000 K star is 58nm and too blue to see with the human eye. True or False.
  16. physics

    carbon dioxide forms into solid (dry ice)at approximately -150 F. What temperature in degree celsuis does this correspond to?
  17. physics

    A 1200kg car travels at a constant speed of 12 m/s around a horizontal, circular track with a radius of 45m. What is the magnitude of the centripetal for
  18. Physics

    A 300v battery is connected across capacitors 3uF and 6uF in parallel. Evaluate the charge and energy stored in each capacitor
  19. physics

    two vhiles move in opposite dirctions to each other with constant speeds of 20 m/s and 30 m/s if the initial distance betwen the vehicles is 100 km. how many second later do they meet
  20. AP Physics B

    An object of mass 3.2 kg is allowed to fall from rest under the force of gravity for 3.5 s. What is the change in its momentum? Ignore air resistance.
  21. 11th grade physics

    if action and reaction are always equal and opposite, why don't they always cancel each other and leave no force for acceleration of the body?
  22. 11th grade physics

    the horizontal range of a projectile is 4 root 3 times of its maximum height. calculate the angle of projection.
  23. physics

    A satellite orbits at an average altitude of h = 423 km. How long does it need to complete one full orbit? Use REarth = 6370 km and mEarth = 5.98 x 10^24 kg
  24. physics

    Two sinusoidal waves of the same frequency travel in the same direction along a string. If ym1 = 4.2 cm, ym2 = 5.9 cm, ö1 = 0, and ö2 = /5 rad, what is the amplitude (in cm) of the resultant wave?
  25. Physics

    A ventilation fan has blades 0.25 m long rotating at 20 rpm. What is the centripetal acceleration of a point on the outer tip of a blade?
  26. physics

    a motorboat travels 25.0 km/h in still water. what will be the magnitude and direction of the velocity of the boat if it is directed upstream on a river that flows at the rate of 4.00 km/h?
  27. Physics

    Hi, Which correctly expresses the relationship between wavelength (L), speed (V) and perios (T) of a sinusodial wavform ? a) L = T/V b) L= 2fxV/ T c) L= 1 / V x T D) L= V/T e) L = V x T f) L= V x T/ 2f I feel it is option (d) ..please check for me .. and
  28. Physics

    Using the definition of the scalar product, find the angles between the following pairs of vectors. A = - 4 i + 2 j + 2 k and B = - 3 j - 3 k I understand to do [(A).(B)]/|A|*|B| = cos theta; but I'm getting 0 for |A| and don't know how to access it from
  29. Physics

    If you ask a friend to drive a small nail into a piece of wood placed on top of a pile of books on your head. Why doesn't this hurt you?
  30. physics

    find the equilibrium of two is N forces acting upon a body,when the angle betweenthem is a)90degrees b)120degrees c)180degrees d)10degrees e)45degrees
  31. physics

    1. During storm roof of house is blown off 2.It is dangerous to stand near the railway track when a train is moving with high speed
  32. physics

    Use these magnitudes of the forces of gravity at Earth's surface to determine the masses of the objects on which they act A)0.98N. B)62N C)44.5MN
  33. physics

    A 4kg box starts up a 30 degree incline with 128J of kinetic energy. How far will it slide up the plane if the co-efficient of friction is 0.3?
  34. physics

    What minimum strength of magnetic field is required to balance the gravitational force on a proton moving at speed 6 106 m/s?
  35. physics

    At what displacement from the equilibrium is the total energy of a simple harmonic oscillator one - sixths KE and five - sixth PE? Answer should be in terms of the amplitude A.
  36. Physics

    Four 7.5 kg spheres are located at the corners of a square of side 0.74 m. Calculate the magnitude and direction of the gravitational force on one sphere due to the other three.
  37. physics

    What is the magnitude of the electric field a distance 3.0mm from an electron? Express your answer to two significant figures and include the appropriate units
  38. physics

    A 25000 kg rock is located at a distance of 7.6 x 108 m away from a small planet of mass 7.8 x 1023 kg. What is the mutual force of attraction between these two
  39. Physics

    How far to the nearest tenth of a meter can a runner running at 11 m/s run in the time it takes a rock to fall from rest 90 meters?
  40. Physics

    A material that remains highly magnetized after a magnetization cycle has a large hysteresis area. Answer True False
  41. Physics

    A block weighing 6.2 N requires a force of 2.2 N to push it along at constant velocity. What is the cooefficient of friction for the surface? Plsssss help asap..
  42. physics

    A person walks 25m west and then 45m at an angle of 60 degrees north of east. What is the magnitude of the total displacement?
  43. physics

    Use these magnitudes of the forces of gravity at Earth's surface to determine the masses of the objects on which they act A)0.98N. B)62N C)44.5MN
  44. Physics

    A flywheel turns through 60 rev as it slows from an angular speed of 2.8 rad/s to a stop. How much time is required for it to complete the first 30 of the 60 revolutions?
  45. physics

    How much work must be done to roll a metal safe, mass 116 kg, a distance of 15.0 m across a level floor? The coeffecient of friction is 0.050.
  46. Basic Physics

    A shoe flung into the air such that at the end of 2.0 m/s it is at its maximum height moving at 6.0 m/s. How far away will it be from the thrower when it returns to the launch altitude.
  47. physics

    a wheel turning with angular speed of 30 rps is brought to rest with constant acceleration. It turns 60 revolutions before it stops.
  48. physics

    A golf ball is hit with an initial velocity of 50 m/s at an angle of 45 degrees with the horizontal. How far will it travel horizontally before it hits the ground?
  49. Physics

    Calculate the vertical distance an object dropped from rest would cover in 12s if it fell freely without air resistance.
  50. Physics

    Forces of 10.6 N north, 20.8 N east, and 14.3 N south are simultaneously applied to a 3.76 kg mass as it rests on an air table. What is the magnitude of its acceleration?
  51. Physics

    A vector has a magnitude of 3.50m and points in a direction that is 145 degree counter wise from the x-axis. find the x and y components
  52. Physics

    A point light source is kept in front of a convex mirror at a distance of 40cm.find the position of image by drawing
  53. physics

    a projectile is fired at 30 degree above the horizontal with an initial speed of 600 m/s. find the direction and magnitude of the velocity after 2 seconds?
  54. physics

    An 75 kg quarterback jumps straight up in the air right before throwing a 0.43 kg football horizontally at 11 m/s. How fast will he be moving backward just after releasing the ball?
  55. 6th grade science (physics)

    explain and describe Law of Universal Gravitation in relation to force, mass and distance
  56. physics

    a mettallic rod of lenght l is rotated with speeed v in uniform magnetic field. find induced current if r is resistance.
  57. physics

    Determine how much water would be present in a 10 tonne sample of lignite, has a moisture content of 65%, before crushing and drying. 10 tonnes is 10,000 kg.
  58. General Physics II

    Find the length of the arc on a circle of radius 10 ft intercepted by a central angle 276. Answer in units of ft.
  59. physics

    A projectile hits a target placed on a level field. It has arange of 37.0 m. The nagle of launch is 33.4 degrees above the horizontal. What was the initial speed?
  60. General Physics II

    A 8.4 kg object oscillates on a spring with an amplitude of 57.7 cm with a maximum acceleration of 9 m/s2. Find the total energy. Answer in units of J.
  61. physics

    rare element very low carbon are composed of symmetrical triangle that have very much, and which are closely linked in the mirror and solid form what can ...
  62. physics

    A solid sphere of mass 2 kg is rolling without slipping on a table with linear speed of 0.5 m/s. Calculate its total kinetic energy.
  63. physics

    what is the maximum speed at which automobile can round a curve of 100 ft radius on level if the coefficient of friction between the tires and the road is 0.35?
  64. physics

    when preparing to undergo an MRI scan, why are patients advised to remove eyeglasses, watches, jewelry, and other metal objects?
  65. physics

    Time() 0 2 4 6 8 10 12 14 16 Velocity() 0 0 2 5 10 15 20 22 22 By measuring the slope of your curve, find the magnitude of the instantaneous acceleration at times = 9s i don't know how to solve it
  66. Physics

    A dense plastic toy of mass 2.8 kg is floating just beneath the surface of a pond. What is the buoyant force on it? Answer in units of N.
  67. Physics

    A rocket traveling at 165 m/s is accelerated at a rate of -32.0 m/s. a) How long will it take before the instantaneous speed is 0 m/s? It takes 5.156 s. b) How far will it travel during this time?
  68. physics

    Calculate the magnitude of the electric field at one corner of a square 1.48m on a side if the other three corners are occupied by 1.92×10−6 Ccharges.
  69. physics

    Calculate the magnitude of the electric field at one corner of a square 1.48m on a side if the other three corners are occupied by 1.92×10−6 Ccharges.
  70. Physics

    When a body slides along an inclined plane of height 'h' and describes a vertical circle of radius r on reaching the bottom Ans:h =5R/2
  71. Physics

    A train initially travelling at 30ms^1 decelerates at 4ms^2. (a) What time will it take to slow to 5m s^1? (b) What distance will it have travelled when it has slowed to 5ms^1?
  72. Physics

    Two positive charges one 2uc and the other 7uc are separated by a distance of 20cm, what is the magnitude of the electrostatic force that each charge exerts upon the other
  73. physics

    the Ferris wheel has a diameter of 150m and takes 30min to make a full circle. Determine the speed of ride in m/s
  74. physics

    A 4kg box starts up a 30 degree incline with 128J of kinetic energy. How far will it slide up the plane if the co-efficient of friction is 0.3?
  75. PHYSICS

    SIMPSON DRIVES HIS CAR WITH AN AVERAGE VELOCITY OF 48.0KM/H TO THE EAST. HOW LONG WILL IT TAKE HIM TO DRIVE 144KM ON A STRAIGHT HIGHWAY?
  76. Physics

    Two positive charges one 2uc and the other 7uc are separated by a distance of 20cm, what is the magnitude of the electrostatic force that each charge exerts upon the other
  77. physics

    how the frequency of the sound produced will change in the case of aluminium sting of length 15cm when the string is tied between two ends
  78. physics

    A rock, mass = 2.0 kg, is fired straight up at 60 m/s from a catapult. What will be its maximum height at the moment it stops going up and starts to come down? Use the magnitude of g to be -10m/s2.
  79. physics

    Two forces F1 and F2 ifF1is double that ofF2 and the resultant is perpendicular on F1 then the angle betwee them is Expain ans with reason and diagram
  80. physics

    A 2.0 m wire segment carrying a current of 0.60 A oriented parallel to a uniform magnetic field of 0.50 T experiences a force of what magnitude
  81. physics 11th class

    Calculate the power of a crane in watts which lifts a man of 100kg to a height of 10m in 20sec
  82. Physics

    An airplane has a takeoff speed of 66m/s. Assuming a constant acceleration of 1.62m/s^2, how long is the plane accelerating down the runway?
  83. Physics 203

    An object is projected upward from the surface of the Earth with an initial speed of 4.6 km/s. Find the maximum height it reaches.
  84. Physics

    Forces of 11.5 N north, 20.4 N east, and 15.7 N south are simultaneously applied to a 3.74 kg mass as it rests on an air table. What is the magnitude of its acceleration?
  85. Physics

    A racing car has a mass of 1540 kg. What is its kinetic energy if it has a speed of 110 km/h? Assume that air resistance is negligible.
  86. Physics

    3000 Joules of energy in the form of heat are added to a copper block with a mass of 1 kg. What is the blocks temperature change?
  87. physics

    The steel I-beam in the drawing has a weight of 1.53 × 103 N and is being lifted at a constant velocity. What is the tension in each cable attached to its ends?
  88. Physics

    For adults, the RDA of the amino acid lysine is 12 mg per kg of body weight. How many grams per day should a 73.0kg adult receive?
  89. Physics

    A ball is thrown at 21m/s at 30degree above the horizontal from the top of a roof 16m high.calculate the time of flight
  90. Physics

    Forces of 11.5 N north, 20.4 N east, and 15.7 N south are simultaneously applied to a 3.74 kg mass as it rests on an air table. What is the magnitude of its acceleration?
  91. Physics

    3 particles of masses m1 = 1.5 kg , m2 = 2.5 kg and m3 = 3.5 kg form an equilateral triangle of edge length l= 135 cm. Determine the center of mass of the system.
  92. Physics

    Determine the moment of inertia for three children weighing 64.0 lb, 44.0 lb and 83 lb sitting at different points on the edge of a rotating merry-go-round, which has a radius of 12 ft.
  93. physics

    A uniform sheet of surface current density Ks=Ky ay in z=0 plane. find the magnetic field strength H everywhere using ampere's law.
  94. physics

    How strong an electric field is needed to accelerate electrons in a TV tube from rest to one-tenth the speed of light in a distance of 4.9 cm ?
  95. physics

    Two wires run parallel to each other with currents I1 = -60.3 A, and I2 = 44.1 A. If they are a = 0.12 m apart, what is the magnitude of the force (N) per meter of length? I used the formula (f/L)=Uo(I1)(I2)/(2(pi)(r)) I got 4.43810^-2(N/m)but it was
  96. physics

    A particular jet aircraft must reach a speed of 43 m/s in order to take-off. If the acceleration of the plane is 1329 m/s2, the minimum length of the runway is Answermeters
  97. Physics

    Some neodymiun-glass lasers can provide 100 TW of power in 1.0 ns pulses at a wavelength of 0.26 um. How much energy is contained in a single pulse?
  98. PHYSICS

    IF JOE RIDES SOUTH ON HIS BIKE IN A STRAIGHT LINE FORE 15 MIN WITH AN AVERAGE SPEED OF 12.5KM/H, HOW FAR HAS HE RIDDEN?
  99. Physics

    The 3.1 kg box shown below slides with a constant speed down an incline at an angle of θ = 28.0° to the horizontal. What is the coefficient of kinetic friction?
  100. physics

    a 1.0kg ball is thrown upward from 1.0m above the ground with a speed of 10m/s reaches a height of 4.5 m. what is the efficiency of the energy transformation?