74,459 results, page 85

  1. physics

    A 78-kg parachutist, in the first few seconds of her jump, accelerates at a rate of 7.4 m/s2 [down]. Calculate the force she experiences due to air resistance.
  2. 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?
  3. Physics

    In grandpa’s time automobiles were previously manufactured to be as rigid as possible, whereas autos are now designed to crumple upon impact. Why?
  4. Physics

    If you look at yourself in a shiny Christmas tree ball with a diameter of 10.5 cm when your face is 35.0 cm away from it, (a) where is your image? (b) Is it real or virtual? (c) Is it upright or inverted?
  5. Physics

    An AC voltage with 169 peak volts is applied across a 506 ohm resistor. To the nearest tenth of a watt, what is the average power?
  6. physics

    A battery of emf and negligible internal resistance is connected to two resistances R1 and R2 in series. What is the potential difference across R2?(a)E(R1+R2)/R2(b)E(R1+R2)/R1(c)ER2/R1+R2(d)ER1/R1+R2
  7. physics

    A tennis player kits a ball at ground level giving it initial velocity of 22.0 m/s at 58 degrees above the horizontal. Any help would be appreciated. Thanks.
  8. physics

    What is the self-inductance of an air-core solenoid,1m long and 0.05m in diameter,if it has 1400 turns?(a)5.23mH(b)4.84mH(c)3.63mH(d)2.42mH
  9. physics

    A loaded truck can accelerate at 8.8 m/s 2 . It loses its load so that it is only 0.6 as massive. By what factor must the acceleration change for the same driving force?
  10. physics PLEASE HELP ME

    A ball rolling down a hill was displaced at 19.6m while uniformly accelerating from rest. If the final velocity was 5.00 m/s what was the rate of acceptation?
  11. Physics

    If the visible part of an ice berg is 50mx50m in area and 20m is above the surface, what is the height, h? I tried using FB=FG but I don't get anywhere. Can anyone help me out?
  12. physics

    My teacher needs us to formulate a question for the science fair. Till now, we have only learned the Kinematics equations, HELP, please....
  13. physics

    An infinitely long wire carrying a current of 2 A is bent at a right angle as shown in the Figure. What is the magnetic field a point P, 10 cm from the corner?
  14. 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
  15. physics..

    What is the maximum height achieved if a 0.800 kg mass is thrown straight upward with an initial speed of 40.0 m·s–1? Ignore the effect of air resistance.
  16. physics

    Suppose electrons enter a uniform electric field midway between two plates at an angle ¦È0 to the horizontal, as shown in the figure
  17. physics 2 for college

    a jet propelled motorcycle start from rest moves in a straightline with constant acceleration and covers a distance of 64m in 4seconds.?
  18. Physics

    A ball thrown straight up at ground level passes a height of 115.7 m in 5.6 s. The acceleration of gravity is 9.8 m/s^2. What was its initial speed? Answer in units of m/s.
  19. physics

    An elevator and rider have a mass of 1600 kg combined. What is the tension force in the cable lifting them at a steady speed of 3 m/s? Assume no friction.
  20. physics

    A missile is launched at an angle of 25 degrees to the ground. It hits a target at 301.5 meters from the point of launch. find the initial velocity
  21. physics

    a rock with a mass of 2 kg is thrown from the top of a cliff 75 m high with a velocity of 10m/s. how much Kinetic energy does it have when it gets to the bottom?
  22. physics

    If a wire has a resistance of 132ohms a length of 110cm and an area of cross- sectional of 0.00415cm square find the resistivity of the material of which it is made
  23. Physics!

    How many joules of potential energy does a 1.2-kg book gain when it is elevated 4.0 ? Express your answer to two significant figures and include the appropriate units.
  24. Physics

    A high efficiency natural gas furnace is 92% efficient. How many joules of output energy will 750kJ of input fuel provide? Please help! Thank you.
  25. 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?
  26. College Physics

    A 3.00-cm-diameter parallel-plate capacitor with a spacing of 0.800mm is charged to 300V . What is the total energy stored in the electric field?
  27. physics

    You throw a ball with a mass of 182.2 g, with a speed of 4.6 m/s. Calculate the kinetic energy in Joules to 3 s.f. , and what is the uncertainty C=1 (Unsure: <67%) C=2 (Mid: >67%) C=3 (Quite sure: >80%)?

    for given angle of projection if time of flight is doubled horizontal range will increase to A FOUR TIMES B thrice C once D TWICE
  29. physics

    A referee tosses a coin straight up with a velocity of 5.25 m/s, how high does it go above its point of release? (Hint: How fast is it moving at the maximum height?)
  30. Physics

    Suppose that a disk rotates through two revolutions in 5.5 seconds. (a) What is its displacement in radians in this time? (b) What is its average rotational velocity in rad/s?
  31. physics

    A ball of mass m is projected with a speed u at an angle theta with horizontol. Find the change in momentum after time t and when it reaches the ground
  32. physics

    Mrs bautista accelerates her bicycle uniformly along a straight path from 10.5 m/s to rest in 5.2s. A. What is her acceleration? B. What is her displacement during this time interval?
  33. Physics

    What is the difference in blood pressure (mm−Hg) between the top of the head and bottom of the feet of a 1.88m tall person standing vertically?
  34. Physics

    What, roughly, is the percent uncertainty in the volume of a spherical beach ball whose radius is r=4.84±0.05m? I keep getting 6% and it says i am wrong.
  35. physics

    The brakes on your automobile are capable of creating acceleration of 14 ft/s2. If you are going 66 mi/hr and suddenly see a state trooper, what is the minimum time required to get your car to 55 mi/hr?
  36. physics

    A commuter backs her car out of her garage with an acceleration of 1.40 m/s2. (a) How long does it take her to reach a speed of 2.00 m/s? (b) If she then brakes to a stop in 0.800 s, what is her deceleration?
  37. physics

    a diver dives from the top of a 100m cliff. he begins his dive by jumping up with a velocity of 5m/s how long does it takes for him to hit the water below?
  38. College Physics

    After 2.5 time constants, what percentage of the final voltage, emf, is on an initially uncharged capacitor C, charged through a resistance R?
  39. Physics

    What is the centripetal force required to cause a 4000 lb car to go around a curve of 900 ft radius and a speed of 600 miles per hour?
  40. physics

    The steel I-beam in the drawing has a weight of 7.10 kN and is being lifted at a constant velocity. What is the tension in each cable attached to its ends? (Assume α = 70.8°.)
  41. physics

    The masses of these particles are mA = 374 kg, mB = 516 kg, and mC = 155 kg. d1 = 0.414 m and d2 = 0.207 m. Calculate the magnitude of the net gravitational force acting on particle A.
  42. physics

    A basketball player achieves a hang time of 0.75 s in dunking the ball. What vertical height will he attain? The acceleration of gravity is 9.8 m/s2 . Answer in units of m
  43. physics

    A basketball is thrown at 45° to the horizontal. The hoop is located 4.4 m away horizontally at a height of 1.1 m above the point of release. What is the required initial speed?
  44. Physics

    A bullet is fired straight up from a gun with a muzzle velocity of 312 m/s. Neglecting air resistance, what will be its displacement after 1.4 s? The acceleration of gravity is 9.8 m/s 2 .
  45. physics

    Three point charges are held at the corners of an equilateral triangle,if q=2 micro columb and length =3cm what is the resultant force on the +q charge
  46. Physics

    A grenade is thrown up into the air with an initial velocity of 27 m/s. How long does it take to return to the thrower's hand? I got 5.4 s, but I am very unsure.
  47. Physics

    Calculate the pressure on the top lid of a chest buried under 4.30 meters of mud with density 1.75 103 kg/m3 at the bottom of a 12.5-m-deep lake
  48. physics

    What is the angular momentum of a 2.43 kg uniform cylindrical grinding wheel of radius 12.5 cm when rotating at 1600 rpm? (b) How much torque is required to stop it in 8.00 s?

    Calculate the pressure on the top lid of a chest buried under 4.30 meters of mud with density 1.75X 10^3 kg/m^3 at the bottom of a 12.5 m deep lake
  50. physics

    A bullet is fired straight up from a gun with a muzzle velocity of 208 m/s. Neglecting air resistance, what will be its displacement after 2.6 s? The acceleration of gravity is 9.8 m/s2 .
  51. physics

    A 244 g particle is released from rest at point A inside a smooth hemispherical bowl of ra- dius 21.7 cm, as shown in the figure The acceleration of gravity if 9.81 m/s2 .
  52. physics 1

    A 8.00-kg block of ice, released from rest at the top of a 1.44-m-long frictionless ramp, slides downhill, reaching a speed of 2.54m/s at the bottom.
  53. 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.
  54. physics

    1) How many seconds does it take a car traveling 40 mph, decelerating at a rate of 7 miles per second, to come to a complete stop? 2) How many feet?
  55. physics

    In state-of-the-art vacuum systems, pressures as low as 1.00 10-9 Pa are being attained. Calculate the number of molecules in a 1.80-m3 vessel at this pressure and a temperature of 31.0°C.
  56. physics

    a jogger does 2.5 *10^5 of work during an exercise routine. her internal energy decreases by 6.8*x10^5. how much heat did she absorb or give off?
  57. Physics

    A baseball with mass of 0.145 kg is thrown straight down at the ground. At a particular speed, it has a drag force of 0.4 N acting on it. What is its acceleration at that time? -2.8m/s^2
  58. physics

    A quarterback threw a football at 27 m/s at a certain angle above the horizontal. If it took the ball 3.3 s to reach the top of its path, how long was it in the air? s
  59. Physics

    Converging lens has focal lenght 8 cm , at what distance you will have to place the object in the following devices; 1) Collimator of Spectrum 2) Terrestrial Telescope
  60. Physics

    A point on a wheel rotating at 5revs/s is located 0.20m away from the axis. What is the centripetal acceleration? a. 198m/s^2 b. .05m/s^2 c. 48m/s^2 d. 1.35m/s^2
  61. College Physics

    An electron in a television tube travels the 12 cm distance from the grid to the screen at an average speed of 7.00 107m/s. How long does the trip take?
  62. physics

    With an average acceleration of −1.3 m/s2 , how long will it take a cyclist to bring a bicycle with an initial speed of 13.7 m/s to a complete stop? Answer in units of s.
  63. physics

    The brakes of a car traveling at 16 m/s can decelerate it until it stops after 10m. Find (a) its negative acceleration, and (b) the time requires to stop
  64. physics

    a man raises a mass,m to a height ,h and then shifts it horizontally over a distance ,x. find the total work done against the force of gravity?
  65. Physics Dynamics

    An arrow has an initial launch speed of 32 m/s. If it must strike a target 38 m away at the same elevation, what should be the projection angle?
  66. Physics

    What is the difference in blood pressure (mm−Hg) between the top of the head and bottom of the feet of a 1.82m tall person standing vertically?
  67. Physics Circular Motion

    What is the maximum speed for a car to safely negotiate a 30 banked curve of 60 m radius if there is a coefficient of static friction of 0.35?
  68. physics

    A lead pellet is propelled vertically upward by an air rifle so that its initial speed is 49 m/sec. Find its total time of flight.
  69. Physics

    two small spheres lie 1.5 meters apart and carry identical charges. How large is the charge on each if a sphere experiences a force of 2.0 N.
  70. physics

    How long does it take a plane, traveling at a constant speed of 233 m/s, to fly once around a circle whose radius is 2090 m?
  71. Physics

    Please help me with this question How much work is done by a boy of mass 70kg who ran up a flight of 31steps each15m high. Take g=10m/s^2
  72. Physics

    Calculate the energy released when 235 U fissions resulting in two lighter stable nuclei with mass numbers 140 and 93.Please help!
  73. Physics

    An echo in Cowboys Stadium is heard after 2 seconds. How far is the person standing from the wall if the speed of sound is 340 m/sec?
  74. physics

    calculate how far along the ground would the bicycle move if one of the wheels had an angular displacement magnitude of 500rev
  75. physics

    A 50 kg girl runs up the stairs to a floor 6m higher in 10 s. What is her power output? P=f.dt P=(50kg x 10m/s2 x6m) __________________ 10 = 300J/s or 300 watts
  76. mathematical physics

    Determine the scale factors for an orthogonal coordinate system (s,t,v) whose coordinates are related to the Cartesian by the following equations: x = 2st, y = s^2-t^2, z = v.
  77. mathematical physics

    Separate the following partial differential equation into a set of three ODEs by the method of separation of variables. d^2/dt^2 = c^2[d^2u/dr^2+1/r du/dr+1/r^2 d^2/d theeta^2]
  78. mathematical physics

    Separate the following partial differential equation into a set of three ODEs by the method of separation of variables: d^2u/dt^2 =c^2,[d^2u/dr^2+1/r du/dr+1/r^2 d^2u/d theeta^2]
  79. physics

    A stationary pool ball with mass 0.20 kg is struck with an average force of 35 N over a time of 18 ms. What speed does it have just after impact?
  80. Physics

    A girl weighing 310 N sits on a hammock supprted by two ropes. Each tied 60 degree from vertical posts. What is the tension on each rope?
  81. physics

    In a gas two waves of length 1m and 1.10m have a frequency difference of 10/3 Hz, the velocity of sound is ? a) 166m/s b) 332m/s c) 83m/s d) 336.7m/s
  82. physics

    A proton with charge mass ratio of 108 C/kg is moving in a circular orbit in a uniform magnetic field of 0.5T .Calculate the frequency of revolution.
  83. 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?

  85. physics

    A bullet is fired straight up from a gun with a muzzle velocity of 217 m/s. Neglecting air resistance, what will be its displacement after 9 s? The acceleration of gravity is 9.8 m/s2 .
  86. Physics

    Two forces whose resultants is 100N are perpendicular to each other. If one of them makes an angle of 60 degree with the horinzontal. Calculate its magnitude
  87. Physics

    The slab of steel shown below is being lifted at 0.50 m/s. It weighs 1.91×103N. If the angle θ equals 61.4 degrees, what is the tension in each cable?
  88. Physics

    6. A car traveling 64 km/hr (40 mi/h) brakes suddenly to avoid a dog crossing the road. It accelerated at a rate of -1350 mi/h2. What was its speed after 0.5 min?

    Calculate the stress, strain and young's modulus of a wire with a cross-sectional area of 3 x 10^-7 m^2 and a length of 0.6 m that is stretched to a distance of 1.2 x 10^-3 by a 120 N force.
  90. Physics

    A bullet shot horizontally strikes the ground with a velocity of 150.0km/h (10 degrees below the horizontal), determine the height from which it was fired.
  91. Physics

    what is the equation describing the motion of mass on the end of a spring which is streached 8.8 cm from equlibrium and then released from rest and whose period is .66 s ? what will be its displacement after 1.8 s
  92. Physics

    Sky divers falls out of a plane at an altitude of 11750 m. How much time in seconds will they pass before they deploy their parachutes?
  93. physics

    A 2kg rock is thrown downward from a height of 3 meters with an initial velocity of 4 m/s. Just before it hits the ground its speed is _____.
  94. Physics

    Calculate the pressure exerted by 75 cms of vertical length of a water column in SI units. Options: A. 7390Pa. B. 7560Pa. C. 7250Pa. D. 7350Pa.
  95. physics

    what minimum initial velocity must aprojectile have to reach atarget at a distance of 25m away?(use g=10m/s square)
  96. 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?
  97. Physics

    A bicycle with tires 64 cm in diameter travels 5.2 km . Part A How many revolutions do the wheels make? Express your answer using two significant figures.
  98. physics

    A uniform chain 10m long and weighing 6 kg permetre hangs vertically.calculate the work required to wind it up.. Plzz solve it
  99. physics

    four particles of masses 1kg, 2kg,3kg, and 4kg are at vertices of a rectangle of sides a and b.if a=1m and b=2m find the location of the center of mass
  100. Physics

    A girl is floating in a freshwater lake with her head just above the water. If she weighs 395 N, what is the volume of the submerged part of her body?
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