physics please HELP !

74,851 results, page 70
  1. physics

    a box is thrown upwards with a velocity of 8m/s and takes 2seconds to reach its maximum height.how high does it go up
  2. Physics

    Calculate the power output of a 1.5 fly as it walks straight up a windowpane at 2.2 2 sig figs P= ___W
  3. physics

    How far to the nearest meter can a sprinter running at 9 m/s, travel in the time it takes a rock to fall 28 meters
  4. physics

    A 60kg boy climbs 70 fligts of stairs each 20cm high in one minute how much powers is developed?
  5. physics

    if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
  6. Physics Help

    What is the energy stored in the inductor shown in the figure after the switch has been closed for a very long time? Take V = 15 V, R = 600 §Ù and L = 10 mH.
  7. physics

    if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
  8. physics

    Two equal masses m are place at positions r©û= (L, 2L, 3L) and r©ü= (3L, L ,2L). Calculate the moments of inertia Ix, Iy, Iz of the system with respect to the x, y, and z axes.
  9. physics

    Calculate the speed of a satellite moving in a stable circular orbit about the Earth at a height of 5400km.
  10. 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?
  11. Physics

    Two copper wires are held under the same tension. If the linear density of the second is twice that of the first, what is the speed of the waves on the second wire (relative to the first)?
  12. Physics

    A weightlifter raises a 90k-g barbell from the floor to a height of 2/2 m in 0.6 s. What was his average power output during the life?
  13. physics

    What is the longest wavelength for standing sound waves in a 102.0 cm long tube that is open at both ends?
  14. physics

    A projectile is fired straight up at a speed of 15 m/s. How long does it take to reach the top of its motion? The acceleration of gravity is 9.8 m/s2 .
  15. physics

    A train is traveling up a 3.6 incline at a speed of 3.30 when the last car breaks free and begins to coast without friction.
  16. Physics

    a man walks 10km towards west and then 15 km towards south. Find the resultant vectors, magnitude and direction.
  17. physics

    A projectile is fired straight up at a speed of 15 m/s. How long does it take to reach the top of its motion? The acceleration of gravity is 9.8 m/s2 .
  18. physics

    Beats in sound are the result of which of the follwing wave? A) resonance.B) refraction.C) reflections.D) amplitude changes.E) interference
  19. physics

    A plane flies south at 220 km/h and is blown west by a 90. km/h wind. Calculate the resultant speed.
  20. science(physics)

    A powerful motorcycle can accelerate from rest to 28m/s in only 4 second . a.what is its average acceleration? b.how far does it travel in that time
  21. physics

    A wave with frequency 11.3Hz and amplitude 48.1 mm moves in the positive x direction with a speed of 5.6 m/s. What is the waves wavelength?
  22. physics

    With an average acceleration of -.56 m/s2, how long will it take a cyclist to bring a bicycle with an initial speed of 13.3 m/s to a complete stop?
  23. physics

    What is the magnitude of force required to accelerate a car of mass 1.7 × 10³ kilograms by 4.75 meters/secondÆ?
  24. Physics

    At what speed would a 50kg person have to run to have the same kinetic energy as a 1000kg auto traveling at 100 km/h?
  25. Physics

    The length of wire is 25.5cm and it's radius is 1.02mm. Calculate the percentage error in mesurement of its volume
  26. Physics

    What would be the path of the Moon if somehow all gravitational forces on it vanished to zero? Please help; need an original answer no Google search. Thank you in advance...
  27. Physics earth & Space

    toward what direction, north or south would you look to the sun at noon on june 21-22 if you lived at the following latitudes
  28. physics

    A group of hikers hears an echo 2.50 s after shouting. If the temperature is 20.0°C, how far away is the mountain that reflected the sound wave?
  29. Physics

    A man carries a 10 kg sack of groceries in his arms with a force of 50 N as he walks forward a distance of 10 m. How much work has he done?
  30. Physics

    Jill screams and hears her echo 4.4 seconds later. How far from the canyon wall is she if the air temperature is 25 degree C?
  31. physics

    When the ray of light travels from air to glass slab and strikes the surface of separation at 90 degree , then it ..........
  32. physics

    If a 1500 kg car stopped from an in 5.6 seconds with an applied force of 5000 N, how fast was it initially traveling?
  33. Physics

    I don't understand this question... What is the change in entropy for a system that has 250 J of heat added to it at 25°C? (Points : 1) 10 J/K 0.84 J/K 0.84 J/K 10 J/K
  34. Physics

    While analyzing a sample of one, geologist finds that it weighs 2n in air and 1.3N when immersed in water. Calculate the density of the one
  35. Physics-Electricity

    Consider three charged particles placed along the x-axis. The particle with q1 = 9.30 nC is at x = 6.87 m and q2 = 4.09 nC is at x = 0.600 m. Where must a positive charge, q3, be placed such that the resultant force on it is zero? x=?m
  36. help fast ,( physics)

    What is the net electrostatic force on the charge q3 (-48ìC), due to charges q1(+78ìC) and q2 (+50ìC)?
  37. physics

    what minimum speed does a 100g puck need to make it to the top of a 3m long 20degree frictionless ramp?
  38. physics

    A proton moves with a velocity V (2i - 4 j + k) m / s in a region where the field is given by B = (i + 2 j -3k) T . What is the magnitude of the magnetic force experienced by the load?
  39. physics

    A body of specific gravity 3.0 is immersed in water. What is the minimum force required to pull it out at velocity 2
  40. Physics

    Moment of inertia of a 'non-uniform' ring of mass M and radius R about axis through centre and normal to its plane is
  41. Physics

    a 4500 kg truck traveling at 17.5 m/s collides with a motionless 1350 kg car. they become locked together. if there is no friction, what is their velocity?
  42. Hurricane Project for Physics Class

    1) Please describe the typical path(s) for hurricanes. Is this part of the pattern of convection?
  43. physics

    Consider two vectors where F1 = 53 N, F2 = 81 N, 1 = 320 , and 2 = 13 ,measured from the positive x axis with the counter-clockwise. What is the magnitude of the resulting vector?
  44. Physics

    What would be the path of the Moon if somehow all gravitational forces on it vanished to zero? Please help; need an original answer no Google search. Thank you in advance...
  45. physics

    The head of a rattlesnake can accelerate 50 m/s2 in striking a victim. If a car could do as well, how long would it take to reach a speed of 78 km/h from rest?
  46. physics

    How much power is developed by a jumbo jet that cruises at 250 m/s. When the trust of its engine is 100,000N?
  47. physics repost

    Which of the following physical properties can be used to measure temperature using a thermometer? A)volume B)pressure C)density D)viscosity I got A
  48. physics

    A 4.00kg kg bucket of water is accelerated upward by a cord of negligible mass whose breaking strength is 73.0N N .
  49. physics

    what pressure (in atm) would be exerted by 76g of fluorine gas in a 1.5 litre vessel at -37 degrees Celsius?
  50. Physics-Could someone please help me?

    Could someone provide me with a simple explanation of how the Doppler Effect is used to determine the speed and direction of moving object
  51. physics

    A 25HP electric motor turning a 1800 RPM will produce how many foot pounds of torque?
  52. Physics

    A female gymnast weighs 400 N. If she is hanging stationary from a high bar, how many forces are acting on her?
  53. physics

    A wave with frequency 11.3Hz and amplitude 48.1 mm moves in the positive x direction with a speed of 5.6 m/s. What is the waves wavelength?
  54. physics

    a particles is moving in the circle of the daimeter 5 cm. calculate the distance coverd and the displacement when it covers 3 revolution
  55. physics

    is increasing the current a valid method to increase the induced voltage when a magnet moves into a solenoid?
  56. Physics

    Calculate  the  length  of  a  meter  stick  moving  with  a  speed  of  v  =  0.9995c  as  measured  by  an   observer  at  rest.
  57. Physics

    Why do we rationalize a denominator? The only reason I can think of and can find in a search is to reduce it because it makes it simpler but is not necessary. Help! I have to write a paper on it.
  58. physics

    Please Help!! How much power is developed by a jumbo jet that cruises at 250 m/s. When the trust of its engine is 100,000 N? Thanks!!!
  59. physics

    a body projected with velocity 30m/s an angle 30¡ã with horizontal maximum height attained by he object is.........?
  60. Physics

    What is the acceleration acting on a grandfather clock's pendulum, of length 0.9m, with a maximum angular displacement of 0.1rad?
  61. Physics

    Two astronauts, one of mass 61 kg and the other 82 kg, are initially at rest in outer space. They then push each other apart. How far apart are they when the lighter astronaut has moved 12 m?
  62. Physics

    The established value for the speed of light in a vacuum is 299 792 458 m/s. What is the order-of-magnitude of this number?
  63. physics

    In order to move a heavy object you must push against it with a larger force than it pushes on you. Is this true or false?
  64. physics

    What is the radial acceleration of an object at a point 25 meters from the axis of rotation that has a radius and a period of .22 seconds?
  65. physics

    What is the weight in newtons of a 250 g package of cereal? need answer and work shown asap! plz and thank u!
  66. algebra based physics

    Two protons in a nucleus are separated by 8.0×10−15m . What's the potential energy of the pair?
  67. physics

    What minimum speed does a 150g puck need to make it to the top of a 3.6m -long, 23 degree frictionless ramp?
  68. Physics

    Find the speed of a pendulum bob at the bottom of its swing if its initial displacement is 5 degrees and its period is 2 s.
  69. physics

    a particle moving on a circlehas a velocity of m/s and normal acceleration of 10m/s2.determine the radius of the circle.
  70. physics

    if a ball is tossed from ground level upward at a speed of 44 m/s how long will it take to reach its maximum height
  71. physics

    when temperature increases from t to # t and the moment of inertia is increase from I to #I. the coefficent of linear expansion is alpha .THE RATIO OF #I\I IS
  72. physics

    The quality of a musical tone has to do with a variety of which of the following? A) amplitudes.B) sound speeds.C) intensities.D) decibels.E) harmonics.
  73. Physics

    A bolt requires tightening to a torque of 98 N-m. If a wrench is 28 cm long, what perpendicular force should be applied at its end?
  74. physics

    A baseball with a mass .8 k g is traveling at a velocity of 11.8m/s. what is it kinetic energy. Round your answer to the nearest tenth.
  75. physics

    Bobpursley; you helped me with my question and I am a little stuck how would I find distance if I don't know time and vice versa?
  76. Physics

    Two identical positive charges exert a repulsive force of 7.0 10-9 N when separated by a distance of 3.2 10-10 m. Calculate the charge of each. _C
  77. physics

    Sam tosses a ball horizontally off a footbridge at 3.2 m/s. How much time passes after he releases it until its speed doubles?
  78. Physics Help

    Charge Q is uniformly distributed around the perimeter of a semicircle of radius R. What is the electric field at the circle's center?
  79. physics

    In the figure below, the bar is 2.4 meters long and has a mass of 145 kg. To the nearest newton what is the tension in the wire?
  80. Physics

    Two objects attract each other gravitationally with a force of 2.1×10−10 N when they are 0.21 M apart. Their total mass is 4.00 KG Find their individual masses. .
  81. physics

    Marks: 2 Light cannot be linearly polarized by: Choose one answer. a. transmission b. reflection c. diffraction d. scattering
  82. physics

    I need to make a holder for a raw egg out of straws so when it is dropped from 8 feet. it will not break I need design ideas.
  83. Physics

    Prove that tanø is equal to U(k) when the block slides down the incline with a constant speed. (Use symbols, not numbers.)
  84. physics

    A proton of mass mp = 1.67 x 10-27 kg and charge +e = 1.60 x 10-19 C is accelerated from rest through an electric potential of 400 kV. What is its final velocity?
  85. physics

    What is the image distance of a 4 cm tall object placed 40 cm from a concave mirror having a focal length of 10 cm? Choose one answer. a. -13.3 cm b. 13.3 cm c. -40.0 cm d. 40.0 cm
  86. grade nine science physics

    Define the following terms and state their SI unit of meausrement? voltage,current, and resistance
  87. physics

    calculate the net charge on a substance consisting of a combination of 3.0X10^13 protons and 8.6X10^13 electrons.
  88. Physics

    an 80kg man jumps off a 60m cliff, halfway to the ground, his GPE is 27,072J. What is his KE at the same moment?
  89. physics

    what is the electric flux through a sphere that has a radius of 2.2m and carries charge of 5.3 micro couloumb at its centre? solution
  90. physics

    How large a force (in newtons) is needed to accelerate a 3 metric-ton vehicle from rest to a speed of 50 km/hr in 4 s?
  91. physics

    Using Kepler's constant (9.84 X 10^-14), calculate the orbital radius of an artificial satellite whose period of revolution around the Earth is 1.43 X 10^4s(3.64 h).
  92. PHYSICS

    Determine the resulting temperature when 1kg of ice at 0 Degree celcius is mixed with 9kg of water.
  93. physics

    Brookney kicks a soccerball with a speed of 17m/s at 43 degress above the horizon. How far does the ball go before it hits the ground?
  94. Physics

    Could a simple machine such as a lever, a pulley system or a hydraulic jack be considered a heat engine?
  95. physics

    Electric power is found by multiplying ___ by current. Is voltage or potential difference a better choice to use?
  96. physics

    Electric power is found by multiplying ___ by current. Is voltage or potential difference a better choice to use?
  97. physics

    Calculate the speed at the edge of a disc of radius 4 cm that rotates at the rate of 8 rev/s. Answer in units of m/s.
  98. physics

    Three blocks are suspended at rest by the system of strings and frictionless pulleys shown in the figure below, where W = 29.0 . What are the weights w1 and w2?
  99. Physics

    Satellites A and B are in circular orbits, with A two and a half times as far from earth's center as B. How do their orbital periods compare?
  100. physics

    consider a pair of planets that find the distance between them is decreased by a factoer of 5. Show that the force between them becomes 25 times as strong?