physics please HELP !

74,641 results, page 38

  1. physics

    If the speed of an object is doubled its kinetic energy is multiplied by
  2. physics

    The standard piece of apparatus used to measure distance in the laboratory is what?
  3. Physics

    What is the change in velocity (in m/s) if an impulse of 225 N acts on a 4.5 kg mass for 3.0 s?
  4. PHYSICS

    ADDITIONAL INO ADDED AT BOTTOM a spectator at a hockey game is sitting in a seat situated 10.4m above ground leve. if the spectator has a mass of 52.6 kg, calculate her gravitational potential energy relative to: a)ground level Eg=mgh =52.6X9.8X10.4 =5360.99J b)the ice surface...
  5. Physics(Please answer, thank you)

    How do you determine the ymax? I know you have to use Q which I have values that were given to me as well as vo values but I am not sure what to do with these values. Physics - drwls, Saturday, September 15, 2012 at 1:29am Define your terms. I have no idea what you are talking...
  6. bobpursley

    ok im doing my physics homework and we have to submit the answers online. i keep getting these questions wrong and i only have one more try can someone please tell me how to work it? a 2.5 kg otter starts from rest at the top of a muddy incline 94.6 cm long and slides down to ...
  7. Physics Newton law

    A 10O0Kg elevator is hoisted upward from rest by a cable. In the first two seconds there is an 1100N tension force in the cable hoisting the elevator. What is the speed after two seconds and how far has it travelled ? Get the acceleration first. Tension=mg + m*acceleration. ...
  8. Physics help

    Are you sure that's how you do #4 because they have 2 different directions. I need physics help. I don't understand how to do these questions. Can someone show me what I should use? and explain. I'll do calculations by myself. A stationary curling stone is struck in a glancing...
  9. physics multiple choice

    A 3.00 lb. physics book rests on an ordinary scale that is placed on a horizontal table. The reaction force to the downward 3.00 lb force on the book is A. an upward 3.00 lb force on the scale due to the table. B.an upward 3.00 lb force on the book due to the scale. C.an ...
  10. physics multiple choice

    A 3.00 lb. physics book rests on an ordinary scale that is placed on a horizontal table. The reaction force to the downward 3.00 lb force on the book is A. an upward 3.00 lb force on the scale due to the table. B.an upward 3.00 lb force on the book due to the scale. C.an ...
  11. Physics repost

    Posted by Mary on Saturday, October 6, 2007 at 5:13pm. Suppose you wish to make a solenoid whose self-inductance is 1.2 mH. The inductor is to have a cross-sectional area of 1.2 10-3 m2 and a length of 0.048 m. How many turns of wire are needed? For Further Reading Physics ...
  12. Physics

    Two 0.09g pith balls are suspended from the same point by threads 40cm long. (Pith is a light insulating material once used to make helmets worn in tropical climates.) When the balls are given equal charges, they come to rest 19 cm apart What is the magnitude of the charge on ...
  13. Physics

    A planet has two satellite moons. Moon X has an orbital period of 2.13 days. Moon Y has an orbital period of about 3.53 days. Both moons have nearly circular orbits. Use Kepler's third law to find the distance of each satellite from the planet's center. The planet's mass is 2....
  14. phsyics

    Posted by MELANA on Thursday, October 18, 2007 at 5:14pm. An object in equilibrium has three forces exerted on it. A 30 N force acts at 90° from the x-axis and a 44 N force acts at 60° from the x-axis. What are the magnitude and direction of the third force? NO IDEA WHERE TO...
  15. physics

    An inquisitive physics student, wishing to combine pleasure with scientific inquiry, rides on a rollercoaster sitting on a bathroom scale. (Do not try this yourself on a rollercoaster that forbids loose heavy packages.) The bottom of the seat in the rollercoaster car is in a ...
  16. agric,physics,life sciences ,pure maths

    can i be an agricultural engineer
  17. Physics

    How long does it take light traveling from the sun at 3.0 x 10^8 m/s to reach Jupiter, which is 780 x 10^6 km away?
  18. physics

    A sports car accelerates from rest to 86km/h\, km/h in 5.2s\, s . What is its average acceleration in m/s2{\rm{m/s}}^2.
  19. physics

    A meteoroid is speeding through the atmosphere, traveling east at 24.5 km/s while descending at 11.6 km/s. What is its speed, in km/s?
  20. physics

    a horse walks 56 meters in 75 second. what is his average velocity?show the work
  21. physics

    Show that the time for the voltage in the RC circuit to rise to (Vo/2) "half-max" is t1/2 = T ln 2
  22. physics

    If the slope in the above problem is 48 degrees, what is the coefficent of friction (to 2 decimal places)?
  23. Physics

    If two resistors are connected in parallel, I know that they share the same voltage but how would you determine their current?
  24. physics

    What is the electric field intensity of a point 15cm from a charge 15microcoulomb
  25. Physics

    What equation gives the velocity as a function of time for an object with constant acceleration?
  26. physics

    To the nearest tenth of a Joule, what is the total energy of the pendulum in problem 2?
  27. Physics

    Find the speed of sound (in m/s) at -35°C at 1 atm pressure in dry air.
  28. physics

    How will changing the charge change the electric field strength at a distance?
  29. PHYSICS

    Calculate the power output of a 1.3-g fly as it walks straight up a windowpane at 2.5 cm/s
  30. Physics please help!!

    A 12.1 g CD with a radius of 6.16 cm rotates with an angular speed of 31.1 rad/s. What is its kinetic energy?
  31. Physics

    can you use principle of density and buoyancy to explain how a cartesian diver works?
  32. physics

    a go cart starts at rest and accelerates to 40 m/s in 200m what is the acceleration of the cyclist?
  33. physics

    what is the kinetic energy of 1,200-kg roadster moving at a rate of 88km/hr?
  34. Physics

    A block of mass 5kg is lifted 2m in 3sec. Find the work done.
  35. Physics

    If a car increases its speed from 5 m/s to 25 m/s over 40 seconds. what is the acceleration? Give the unit.
  36. physics

    why is it harder to maintain costant accleration rather than cosntant velocity when walking
  37. Physics

    calculate the kinetic energy, in J, of a 1200kg automobile travelling at 36km/h
  38. Physics

    A coin and a piece of glass are both heated to 60°C. Which will feel warmer when you touch it?
  39. physics

    A 0.355-kg object undergoing SHM has ax = 2.30 m/s2 when x = 0.235 m. What is the time for one oscillation?
  40. physics

    How much work is required to stop an electron (m = 9.11 10-31 kg) which is moving with a speed of 2 106 m/s?
  41. Physics

    What term describes a force that causes an object to move in a circular path?
  42. Physics

    What is a node? i'm supposed to label the nodes in a diagram of a wave but i can't find it anywhere
  43. Physics

    How much work does a weightlifter do on a 450 N barbell thathe lifts 2m into the air
  44. Physics Class

    The equation describing the motion of an object is y=0.8cos(4.2t+0.32). What is its period?
  45. physics

    What would happen when a bird would fly in a moving train of speed 200km/h
  46. physics

    the speed of a certain wave is 3.00cm/s. if its frequency is 0.20hz, what are its wavelength and period
  47. Physics

    What is the acceleration of a proton moving with a speed of 4.3 m/s at right angles to a magnetic field of 2.1 T?
  48. physics

    Find an expression for the energy densityin terms of stress and strain.
  49. physics

    ifv=(3i+4j+5k)m/s is the instantaneous velocity of a body mass 1.50kg calculate its K.E
  50. physics

    What is the momentum of an automobile (weight = 9800 N) when it is moving at 36 m/s to the south? magnitude
  51. Physics

    A 70 kg woman pushes on a wall at 35 newtons and recoils. What is the magnitude of the force?
  52. physics

    What equation gives the position as a function of time for an object with constant acceleration?
  53. physics

    What is the length of a box in which the difference between an electron's first and second allowed energies is 1.30×10−19 ?
  54. Physics

    Why do some cooks put long aluminum nails through potatoes to be baked?
  55. Physics

    Find the attractive force bet a 50 kg girl and a 60 kg boy, if they stand 2.00 m apart.
  56. physics

    how to show with the help of a model that resistivity of a conductor increases with increase in temperature?
  57. Physics

    show that the oscillation of a liquid in a u-tube is in simple harmonic motion.
  58. Physics

    How much work does a person do to lift 60000 a distance of 7.8 ft in 10s? How much power? Hp?
  59. Physics

    Calculate how far and apart two indentical charges of 1.0 C must be in order for the Coulomb force between them be less than 500 N
  60. Physics

    Describe how surface area and volume are related in solids? Give an example.
  61. Physics

    what 2 properties of carbon make it a good material to use for motor brushes?
  62. physics

    A meteoroid is speeding through the atmosphere, traveling east at 19.5 km/s while descending at 12.7 km/s. What is its speed, in km/s?
  63. Physics

    In the photoelectric effect, what happens to the stopping voltage when the light frequency is decreased?
  64. Physics

    An object is thrown upward with a speed of 21.5 m/s. How high above the projection point is it after 2.06 s?
  65. Physics please help!!

    A 12.1 g CD with a radius of 6.16 cm rotates with an angular speed of 31.1 rad/s. What is its kinetic energy?
  66. physics

    How will changing the distance change the electric field strength for a given charge?
  67. physics

    what is the most important element for creating a magnetic field. and why? Moving charges..... right?
  68. physics

    Suppose a rock fell off a cliff. After 5 seconds, its speed well be 100 m/s
  69. physics

    5. An object that has kinetic energy must have A) momentum. B) acceleration. C) a force applied to it. D) All of these. E) None of these.
  70. Physics

    a football is kicked in 36 meter per second and 30 degree angle with land.After 1 second,how much it's velocity will ?
  71. physics

    5. An object that has kinetic energy must have A) momentum. B) acceleration. C) a force applied to it. D) All of these. E) None of these.
  72. physics

    A 5.0-g CD with a radius of 6.0 cm rotates with an angular speed of 20 rad/s. What is its kinetic energy?
  73. AP Physics

    A car slows down from 18 m/s to rest in a distance of 91 m. What was its acceleration, assumed constant?
  74. physics

    a particle which has zero rest mass and non zero energy and momentum must travel with a speed?
  75. Physics

    How can you prove that acceleration due to gravity is the same in a resting and moving frame?
  76. physics

    find the acceleration of a bicycle slowing fron 3m/s to a stop in 5 seconds?
  77. Physics

    Two vectors A. and B have magnitude A = 3.00 and B = 3.00. Their vector product is A x B= -5.00k + 2.00i. What is the angle between A and B?
  78. physics

    A tank of 10m height is filled half what will be pressure at bottom
  79. physics

    A 5.0-g CD with a radius of 6.0 cm rotates with an angular speed of 20 rad/s. What is its kinetic energy?
  80. physics

    A hunk of cast concrete with a weight of 10 N will float if it displaces 10 N of water.
  81. physics

    How much heat is needed to raise the temperature of 2kg of water to 10K?
  82. physics

    mass of coaster is 800kg second hill is 70m do you take 800*70*9.8=548800 Please help
  83. physics

    A gas occupies 20 dm³at 30°c at 2.5 atm find its volume ayt s.t.p.
  84. Physics

    If a car delivers 76.2 hp of power, how much time will it take for the engine to do 5.78e5 J of work?
  85. Physics

    Roads seldom go straight up a mountain, they wind back and forth. Explain why this is useful
  86. physics

    A body of mass 20kg dropped from a height of 2m calculate the workdone?
  87. Physics

    How much power is required to move a 1500 kg elevator at a constant velocity of 2.5m/s.
  88. Physics

    According to special relativity, the momentum (mv) of an object at relativistic speed is actually: more, less or no different than if it were at rest
  89. Physics

    an elastic band is stretched a distance of 0.150m by a force of 100.0
  90. physics

    true or false an object with a mass of 9.0 kg has an acceleration of 3 m/s. the force acting on it is 3n
  91. physics

    Explain why the line touches the x-axis at approximately 30oC and 45oC.
  92. physics

    You are driving a car with a power output of 56,000 Watts. How many seconds will it take to go from 0 m/s to 27 m/s?
  93. physics

    How much heat is absorbed by an electric refrigerator in charging 2 Kg of water at 15°C to ice at 0°C?
  94. physics

    A 87-g ice cube at 0°C is placed in 886 g of water at 28°C. What is the final temperature of the mixture?
  95. Physics

    I need to explain and demonstrate mathematically why it is easier to pull a wheelbarrow than it is to push it
  96. physics

    an automobile travels at a uniform speed of 88 kph. how many metres does it travel in 1 second?
  97. physics

    A 87-g ice cube at 0°C is placed in 886 g of water at 28°C. What is the final temperature of the mixture?
  98. Physics

    I need to explain and demonstrate mathematically why it is easier to pull a wheelbarrow than it is to push it
  99. physics

    if the piston is in thermal equilibrium but the it is pushed inward, can there be a change in temperature(increase) even if Q=o
  100. Physics

    Two vectors A and B have magnitude A = 3.00 and B = 3.00. Their vector product is A x B= -5.00k + 2.00i. What is the angle between A and B?
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