physics please HELP !

74,760 results, page 55
  1. Physics

    A car initially moving at 15 m/s accelerates at 4.5 m/s2 over a distance of 10 m. Find the final velocity?
  2. Physics

    what is your power output if you climb a 2m ladder in 10 seconds? suppose your height is 565N.
  3. Physics

    On a dt graph if there is a curve from 1 decreasing to 1.2 in an interval does is the velocity and acceleration + or 9? And is it slowing down or speeding up or neither?
  4. physics

    A wheel has turned through 120 revs in 10 s after starting. find the angular acceleration.
  5. Physics

    How fast must a plane fly at a latitude of 41.9° so that the sun stands still relative to the passengers?
  6. Health Physics

    The human body is 20-25 percent efficient. In what form is energy lost?
  7. physics

    Bob jumps into a pool, after he stops moving and becomes stationary i the water. What happens to his k energy?
  8. Physics

    If the period of the moon were 31 days while its orbit radius 3.8x10^8m, what would the mass of the Earth be?
  9. physics

    Why is parallax method not useful for measuring the distances of stars more than 100 light years away?
  10. Physics

    Why are the armature and field windings of an electric motor usually wound on an iron core?
  11. physics

    a pendulum swing with a speed of 1.5 m/s at its lowest point. How high will it rise before it stops
  12. physics

    The three vectors in the figure below have magnitudes a = 2.45 m, b = 3.15 m, and c = 15.0 m and angle θ = 36.5° find x component of vector a
  13. physics

    determine the thrust produced if 1.5 x 10^3 kg of gas exits the combustion chamber each second, with a speed of 4.00 x 10^3 m/s
  14. Physics

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

    how much energy is stored in a pinball machine spring (constant=750N/m) that is compressed 3 cm?
  16. physics

    describe with the aid of a fully labelled diagram the features and their uses of a bicycle pump
  17. physics

    What is the acceleration experienced by the tip of the 1.5 cm long sweep second hand on your wrist watch
  18. Physics

    A bike starts from rest and accelerates to 20 m/s over a period of 6 seconds. What is the acceleration of the car?
  19. Physics

    what is the mass of the toy truck if the force of friction holding it in place is 18.5N u= 0.2 at 30 degrees
  20. Physics HELP ME PLEASE

    A 1250 kg car increases it's speed from 11 m/s to 27 m/s in 5.4 s. - What is the cars acceleration? - How much force is required?
  21. physics

    a stone is thrown upward with a speed of 24.0m/s how fast is it moving when it reaches a height of 13.0m?
  22. Physics

    A 1.15 kg block slides down a 19.0 m long 29.0° incline at constant velocity. How much work is done by friction?
  23. physics

    The three vectors in the figure below have magnitudes a = 2.45 m, b = 3.15 m, and c = 15.0 m and angle θ = 36.5° find the x and y component of vector a
  24. physics

    What is the frequency of the microwaves in a microwave oven? The wavelength is 12 cm. I have to give the answer in GHz
  25. Physics

    What is power output of a 60 kg person who walks up a 4 meter flight of stairs in 4.0 seconds?
  26. Physics

    A 0.50 kg hammer is taken on a space mission. What is its weight on a planet where the acceleration due to gravity is 3.8 m/s2? 0.50 kg 1.9 kg 0.50 N 1.9 N
  27. physics

    Can an adult male be rescued from a fall by tying a rope to a car's axle?
  28. physics

    A child slides down a hill on a toboggan with an acceleration if 1.5 m/s2^2. If she starts at rest, how far has she traveled in (a) 1.0s,(b) 2.0s, and (c) 3.0s?
  29. physics

    What is the kinetic energy of a car of mass 1900 kg moving at a constant speed of 21 m/s
  30. physics

    Find the gravitational force of attraction between two balls each weighing 10 kg,when placed at a distance of 1 meter apart
  31. physics

    how many energy is transferred when 8.9g of liquid hydrogen changes to gas -253 degree celsius
  32. physics

    What force is needed to accelerate a child on a sled with the total mass of 43kg at 1.5m/s
  33. Physics

    What is the mass of water that has its temperature raised from 27°C to 32°C when it is heated by 5.0 x 106 J of heat energy?
  34. Physics

    List at least two major potential asvantages of power production by fusion rather than by fission.
  35. physics

    An object accelerates uniformly from rest at a rate of 2 m/s2 for 3 s and then 5 m/s2 for 15 s. Find its final velocity?
  36. Active physics

    How much hear must be added to 1.5kg of water at -25degC to raise it up to 119degC?
  37. physics

    a body travels 200 cm in the first two second and 220 cm in the next 4 seconds.what will be the velocity at the seventh second from the start.
  38. physics

    A speedboat increases in speed from 21 m/s to 30.9 m/s in a distance 191 m. Find the magnitude of its acceleration.
  39. Physics

    If the third harmonic of a standing wave in a vibrating string is 600 Hz, what is the fundamental frequency?
  40. Physics

    A constant 5 N horizontal force hits a stationary 2 kg ball. What is the balls speed after going 10 m?
  41. Physics

    What acceleration would a 35 KG box have if we pushed it with a force of 275 N across a surface that has a coefficient of friction of .7?
  42. Physics

    If you are 2.0 s from being directly under a window that is 11 m above the sidewalk your standing on, and someone throws a water ballon will you get hit?
  43. Physics

    A ball travels 200cm in the first 2sec and 220cmin the next 5sec. Find the velocity at 7s
  44. physics

    If a man weighs 820N on d earth what would be on Jupiter, where the acceleration due to gravity is 25.9m/s
  45. Physics

    What distance does Anna covered by running on a circular track of length 500m?
  46. Physics

    Air in a balloon does 50 J of work while absorbing 70 J of heat.What is its change in internal energy?
  47. Physics

    If the cosmic microwave background radiation (CMBR) is at a temperature of 2.7K, what is its peak wavelength?
  48. Physics

    A fuel has heat of combustion equal to 30 kJ / g. How much energy is released when 5 kilograms are oxidized?
  49. Physics

    What is the difference in blood pressure between the head and feet of a person of height 171 cm?
  50. physics

    The speed of a train increased from 15 mi/hr to 25 mi/hr in a distance of 500 ft. Calculate the average acceleration in ft/s2.
  51. physics

    A hockey puck has no friction on it. It has a mass of 0.28 kg and experiences a force of 48 newtons. What is its acceleration?
  52. Physics

    The speed of a train increased from 20 mi/hr to 30 mi/hr in a distance of 500 ft. Calculate the average acceleration in ft/s2
  53. physics

    Wrap a cotton wool around a thermometre,will its temperature rise? Explain your answer please
  54. Physics

    Time taken by an object falling from rest to cover the heights of h1and h2 are respectively t1 and t2.then the ratios of t1 and t2 is
  55. physics

    How high must a 2.0-kg basketball be thrown so that the top of its arc, it has a potential energy of 160 J?
  56. physics

    8. Before you drop a ball held at a height of 5m with a weight of 20 N, what is its gravitational potential energy
  57. Physics

    Determine the acceleration of an electron placed in a constant downward electric field of 4.0X10^5N/C.
  58. physics

    calculate the speed of an 7.3*10^4kg airliner with a kinetic energy of 1.4*10^9J. answer in units of m/s.
  59. Physics

    A projectile is shot straight up from the earth's surface at a speed of 1.20×104 km/hr. How high does it go?
  60. physics

    The density of a solid ball with a mass of 231 g and a volume of 110 cm^3 is ____ g/cm^3.
  61. Physics

    A nurse counts 76 heartbeats in one minute. What are the period and frequency of the heart's oscillations?
  62. physics

    If the density of a medium is 1000 kg/m3 and the propagation speed is 1540 m/s, the impedance is rayls.
  63. Physics

    Find speed of sound in air if distance is 170 meters and time is 1.1 second
  64. physics

    A tuning fork produces a wave at 280 Hz and with a wavelength of 1.5 m. Calculate its velocity.
  65. Physics

    How would I find final velocity at the top of an inclined ramp with a given angle theta?
  66. Physics

    what is the distance that a satellite must be from Earths surface if it's period of rotation is 1 day? I really not sure where to even start..
  67. physics

    Three balls A, B, and C, with masses of 3 kg, 1 kg, and 1 kg, respectively, are connected by massless rods. What are the coordinates of the center of mass?
  68. physics

    a ball moves with a constant speed of 4 m/s around a circle of radius 0.25 m. what is the period of the motion?
  69. physics

    Good job "Drwls", your answer to my bowling ball question worked. Way to go!
  70. physics

    a ball is thrown vertically upward at a speed of 45 m/s. how long does it take to return to the ground?
  71. physics

    how much torque do you exert if you push perpendicularly on a door with a force of 30 N at a distance of 0.85 m from its hinges
  72. physics

    How much energy becomes unavailable for work in an isothermal process at 440 K, if the entropy increase is 25 J/K
  73. physics

    what force must the woman in Figure 3.38 exert on the floor with her hands in order to do a pushup?
  74. physics

    Find the density of a substance whose mass is 28 grams and whose volume is 4 cubic centimeters
  75. Physics

    The parabolic TV antenna receives electromagnetic waves from satellites. What is special about these rays?
  76. physics

    you drop a penny off the roof and it htis the water 4.2 seconds later, what is the height of the bridge?
  77. Physics

    calculate the magnitude of the resultant of a pair of 100-km/h velocity vectors that are at right angles to each other. Please help me! thanks!
  78. physics

    It takes 2.75s for the rock to hit the water at 54.45mph, how high is the bridge?
  79. Physics

    Can someone explain why electrons cannot exist in orbitals and why we need to describe their location in terms of probabilities.
  80. Physics

    A dog is running at 3.0 m/s for 3.6 km. How long did it take him to arrive at his destination? (Give answer in seconds)
  81. physics

    how to calcula distance of a object in free fall if only the time it reaches the ground is given
  82. physics

    If a protonand an electron are released when they 2.0X10^-10m apart, find the initial accelerationof each of them. I know a=ke^2/mr^2 k = 8.99 x 10^9 e = 1.6 x 10^-19 r = 2.0x 10^-10 so what is the m ????
  83. physics

    Is it possible for a frictional force to increase the mechanical energy of a system? If so, give examples.
  84. physics

    What is the magnitude of the electrostatic force on a +5 C harge 1.75 m to the left of a -2.5 C Charge? (show your work)
  85. Physics

    From the standpoint of energy and power, what are the advantages for a car with high horsepower? What are the disadvantages?
  86. applied physics

    if a DC motor uses a775 coulombs of charge in 15 seconds,how much current is produced
  87. Physics

    Calculate the average speed of the car in km/h, it can accelerate from 96.56 km/hr in 4.3 seconds. Distance is not provided
  88. Physics

    What is the age in years of a bone in which the ratio 14C/ 12C is measured to be 2.3×10^−13?
  89. Physics

    Will a cyclist coast farther if the lamp connected to his generator is turned off? Explain.
  90. Physics

    What is the age in years of a bone in which the ratio 14C/ 12C is measured to be 2.3×10^−13?
  91. Physics check

    In 1906, J. J. Thomson won the Nobel Prize for the discovery of the ..... electron?

    At what height above Earth's surface is the gravitational acceleration reduced from its sea-level value by 0.40%?
  93. physics

    find the acceleration of a 3 kg mass as it moves with a constant speed of 4 m/s along a circle of radius 2 m.
  94. physics

    How long is a rocket in the air if it is shot at an angle of 55¢ª with an initial velocity of 25 m/s and traveled for 88 m
  95. Physics

    8. Fire engines used to be red. Yellow-green is now the preferred color. Why the change?
  96. Physics

    If I dropped a bowling ball from the empyre state building, at what velocity would it descend?
  97. physics

    When the experimental set up is immerse in water of refractive index n=1.5.what will be the charge in beta?
  98. physics

    A car traveling at +7.2 m/s accelerates at the rate of 0.65 m/s 2 for an interval of 2.4 s. Find vf . Answer in units of m/s
  99. physics

    what is the potential energy of 4 point charges each of value Q at the corners of a square of side length a.
  100. Physics 30

    If a truck moving at 30km/hr accelerates at 2.5m/s^2 to 50 km/hr, what time (in sec) does it take? a. 2.22s b. 5.56s c. 8 s d. 28.8s