Math/Physics

215,876 results, page 50
  1. 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.
  2. Physics

    What angle should you rotate a mirror so that a reflected ray rotates through 28 degrees. I got 20, but i am not sure, please help
  3. Physics

    What is the fundamental frequency on a 5 m rope that is tied at both ends if the speed of the waves is 24 m/s?
  4. physics

    An 80 kg skateboarder going 10 m / s is launched nearly vertically off a ramp as shown. Approximately how high does he go?
  5. physics

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

    A ball is dropped from the roof of a building. How much time does it take to reach a velocity of 15.4 m/s?
  7. Physics

    A ball is thrown downward at 12.3 m/s. How much time does it take for it to reach the ground, 182.6 m below?
  8. physics

    what impulse is needed to slow a 45kg object from 15m/s to 12m/s?
  9. physics

    5. What is the acceleration of a 20 N object that is pulled up a 30° incline by a 25 N force? The coefficient of friction is 0.30.
  10. physics

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

    Two point charges of magnitude 2.0 X 10^-7 C and 85 X 10^-8 C are placed 12 cm apart .What is the field intensity of each charge at the site of other ?
  12. physics

    how does temperature affect the time it takes to reach thermal equilibrium?
  13. physics

    which of acceleration age speed temperature and velocity are vector quantities
  14. physics

    what is the kinetic energy of a 200 g bullet travelling at a velocity of 400 m/s?
  15. Physics

    If a racehorse starts from rest and accelerates at a rate of 4.7 m/s2, how long does it take the horse to go 20 m?
  16. physics

    A ball is dropped from the roof of a building. How fast is it moving after 4.6 seconds?
  17. physics

    What is the magnitude of the acceleration of a sprinter running at 9.0 m/s when rounding a turn of a radius 26 m?
  18. Physics

    Let U=(13i3−i). What is U†? Explicitly indicate multiplication with a * symbol. For instance, you should write 3*i+2 instead of 3i+2.
  19. physics

    What force is needed to accelerate a child on a sled (total mass = 60 kg) at 1.25 m/s2?
  20. Physics

    You have a circular table. You measured its radius to be 10 cm with an uncertainty dr =+/- 3mm. The area would be A +/- a cm^2. a. What is A? b. What is a?
  21. Physics

    Identify the correct neutrino (Ve, Vµ, Vτ or their anti-particles) a) π+ —> p° + e+ + v b) π+ —> p° + µ+ + v c) τ+ —> e- + v + v Please explain why too...I'm really lost. I'd appreciate any help.
  22. Physics

    A vibrating point on a spring travels 60 mm during three cycles. What is the amplitude of the vibration?
  23. Physics

    how much heat is needed to vaporize a 400.0 g of liquid water at 310.0 K?
  24. physics

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

    If the electron experiences a force of 5.6 x 10-6 N, how large is the field between the deflection plates?
  26. Physics

    You have a circular table. You measured its radius to be 10 cm with an uncertainty dr =+/- 3mm. The area would be A +/- a cm^2. a. What is A? b. What is a?
  27. physics

    find the %error in the measurement of refractive index of glass. the values was 1.54,1.53,1.44,1.54,1.56& 1.45.
  28. 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.
  29. physics

    why it is easier to tear a paper off a full roll than a mostly used one? Is it because of Newton's law?
  30. physics

    The acceleration of a certain rocket is given by a=bt where b is positive cnstant, find the position function Xo and Vo at t=o?
  31. physics

    10 kg of ice at -4 C is dropped into 15.1 kg of water at 36 C. What is the final temperature of the mixture? T_final =
  32. physics

    How will changing the charge change the electric field strength at a distance?
  33. physics

    find the moment of inertia of the earth. Radius is 6,000 km and mass is 6 x 10^24 kg
  34. physics

    You throw a ball straight up at 25 m/s. How many seconds elapse before it is traveling downward at 13 m/s? 1 s
  35. physics

    3. A 5 N block slides down a 20° incline at constant speed. What is the frictional force?
  36. Grade 11 Physics

    Rearrange the equation : d=v2t - 1/2at(squared) to solve for a
  37. physics

    If a bug traveled a distance of 180 meters at a speed of 15 m/s, what was the time?
  38. Physics 221

    How much charge flows through a 12 –V battery when a 2.0 mF capacitor is connected across its terminals?
  39. physics

    A soccer ball has a diameter of about 22 cm and a mass of about 430 g. What is its terminal velocity?
  40. physics

    A car accelerates from rest at 2.57 m/s2. What is the velocity at the end of 5.4 s? Answer in units of m/s
  41. Physics

    What’s the specific heat of a material if it takes 6.5 kJ to increase the temperature of a 1.8 kg sample by 6.4 ∘C ?
  42. Physics

    For a pendulum that completes fifteen complete swings in 34.8 seconds, how much is the frequency?
  43. Physics

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

    if it costs 4.5 to 7.5 cents per kilowatt-hour (wind energy) what is the price per kW?
  45. physics

    if I drop a camera 40m high,how long before it hits the floor? G= 9.81
  46. Physics

    Runners in the 100-m dash use starting blocks. Explain what this device does. PLEASE HELP.
  47. physics

    masses of 3,5,7,8 kg are suspended at equal distances of 1 m from rod.Find the CG of the arrangement.
  48. physics

    5. What is the acceleration of a 20 N object that is pulled up a 30° incline by a 25 N force? The coefficient of friction is 0.30
  49. physics

    whats the acceleration of a car traveling 402 meters in 6 seconds
  50. physics

    The sensitivity of a galvanometer of resistance 990ohm is increased by 10 times.The shunt used is??
  51. physics

    how long will it take for an apple falling from a 29.4m tall tree to hit the ground? how
  52. physics

    You throw a ball straight up at 25 m/s. How many seconds elapse before it is traveling downward at 13 m/s?
  53. physics

    a year ago she measured 98cm from her tree . now it 1.1m tall how much has it grown
  54. physics

    3. A 5 N block slides down a 20° incline at constant speed. What is the frictional force?
  55. Physics

    If a 75-kg skater starts his skate at 8.0m, at his lowest point (height = 0), what is his velocity?
  56. physics

    What capacitance is required to store an energy of 13 kW·h at a potential difference of 940 V?
  57. physics

    TWO R WHEN CONNECTED IN PARALLEL GIVE RESULTANT VALUE BECOMES 9 OHM CALCULATE VALUE OF REESISTIVITY
  58. 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.
  59. physics

    Two point charges, each 6*10-5 C, are separated by 30 cm. What is the electrostatic force produced by this arrangement?
  60. Physics

    A ball thrown downward with an initial velocity of 20m/s.what will be itsvelocity after 5s
  61. Physics(light)

    why the ray reflected by the prism is brighter than that by the plane mirror?
  62. 9th grade conceptual physics

    How do you find the cargo capacity for a boat?
  63. physics.

    an object travels 219 meters with acceleration 6.43 m/s^2 over an interval of 2.86 seconds. What are Vi and Vf.
  64. physics

    A 2.7 kg object falls from a tower. It experiences 2.3 N of air resistance. What is the acceleration?
  65. physics

    An object has a length of 5.0 cm, a height of 3.0 cm and a width of 15.0 cm. It has a mass of 24 grams. What is its density?
  66. physics

    explain the input energy and out put energies of two kitchen machines
  67. Physics

    In the photoelectric effect, what determines the kinetic energy of the ejected electrons?
  68. physics

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

    what is the gravitational force on a 60k person on the earth, due to the moon?
  70. physics

    find the impulse on a baqseball that is hit 80N of force in a time of 0.52 s
  71. Physics

    How much work must be done to accelerate an 8x105 kg train: a) from 10 m/s to 15 m/s; b) from 15 m/s to 20 m/s; c) to a stop an initial speed of 20 m/s?
  72. Physics!

    A 40 kg girl runs up a flight of stairs that is 34 m high. How much work does this require?
  73. physics

    Calculate the angular velocity of a swinging pendulum whose length is 125cm
  74. physics

    can anyone give me a site that "best explains" about Rotational motion/Angular. thanks a lot.. :)
  75. physics

    An object is thrown vertically upward with a speed of 19.1 m/s. How high does it rise?
  76. Physics

    what is the schwarzschild radius of a black hole with a mass of 1.68x10^43kg
  77. physics

    spring has k=82 N/m use a graph to determine the work needed to stretch it from x= 3.8 cm to x=6.2 cm where x is the displacement
  78. physics

    A lizard accelerates from 2m/s to 10m/s in 4 seconds. What is the lizards average acceleration?
  79. physics

    What is the wavelength of the higher frequency limit (18 megahertz) in dry air at 0 C?
  80. Physics

    When hitting a golf ball, does the force of gravity increase or decrease??
  81. physics

    Explain why voltage doesn't change when connecting resistance in series
  82. Physics

    If a car accelerates from rest to 15 m/s for a distance of 200 m. What is the magnitude of acceleration?
  83. Physics

    What weight of water is required to fill a 80 gallon aquarium? The answer must be in kN
  84. Physics

    P= 231fraction numerator f t asterisk times l b over denominator s end fraction t= 14.3s W= ?
  85. physics

    where would the image of a 4.0 cm tall object that is 12 cm in front of a flat mirror be located?
  86. Physics

    Two forces of 4 N and 6 N act at a point along the same horizontal line. What is its resultant force?
  87. physics

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

    What is the concentration (in g/100ml ) of a solution which has 2,8g of NaCI dissolved into 88.0ml of water?
  89. Physics

    How many calories of heat are gained to turn 10 grams of ice at 0 C into water at 0 C?
  90. physics

    A car is moving down a highway at -15 m/s and accelerating at 3 m/s^2. If it's initial position is at x = 0 m where will it be after 3 seconds?
  91. physics

    explain the input energy and out put energies of two kitchen machines
  92. physics

    if r1=2ohms, r2=4ohms, r3=6ohms. Then what is the voltmer reading connected in series
  93. Physics

    If the specific volume of red brass is 0.001865 ft/3lb. What would be the density? Thanks!
  94. Physics

    Show that work done in a wire, E=YAsqr(e)/2l, explainthe symbols. pls help.thanks
  95. physics please help!

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

    Find the density of the earth if its mass is 6×10^3kg and radius is 6.4×10^3km
  97. Physics

    If you combine 34 kg of ice at 0°C with 80 kg of steam at 100°C, what is the final temperature of the system? °C
  98. PHYSICS

    A hypothetical planet has a mass 1.49 times that of Earth, but the same radius. What is g near its surface?
  99. Physics! NEED HELP!

    A 40 kg girl runs up a flight of stairs that is 34 m high. How much work does this require?
  100. physics

    What is meant by the statement that the specific latent heat of steam is 2260000jkg