physics please HELP !

74,760 results, page 68
  1. physics

    wonder waves in shallow yellow disc are 6.0 cm long. at one point, the water oscillates up and down at a rate of 4.8 of oscillations per second
  2. Physics

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

    A body with a mass of 75 kg is located at a height of 20 m. If it is allowed to free fall to the ground. What will be its velocity on impact?
  4. physics

    A red flower seen in the light of mercury vapour lamp through a green filter wil appear in what colour?
  5. Physics/ Chem

    Find the entropy change when 51g of steam condenses to water at 100 ∘C.
  6. physics

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

    Why do some cooks put ice in the pot to cook meat? Explain then prove your answer by solution?
  8. physics

    How many times will the incident beam shown in Figure P25.3 (x = 1.10 m, y = 1.80 m) be reflected by each of the parallel mirrors? mirror on the right
  9. 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?
  10. Physics

    Calculate the earth's orbital angular speed in radians/sec due to its motion around th sun.
  11. Physics

    Please help! 400 calories of heat are added to 40grams of water at 20celcius . What's the final temp reached ?
  12. Physics

    Two objects attract each other gravitationally with a force of 2.3×10−10 when they are 0.21 apart. Their total mass is 4.50 . Find their individual masses.
  13. physics

    In a right triangle ABC, C = 90°, a = 21 ft and b = 76 ft. Solve for all the missing parts using the given information. (Round each answer to the nearest whole number.)
  14. physics

    the time a male bungee jumps is freely falling is 1.5 seconds. what is the velocity of the jumper at the end
  15. Physics

    The distance between Earth and the Moon is 3.84 * 108 m. Show that the round-trip time for the light is 2.56 s Thanks in advance
  16. physics

    what is the t shirts vertical componet of its velocity at launch? if it launches straight at 45° above the horizontal plane at 141 /s?
  17. physics

    A pendulum bob swinging at a velocity of 10 m/sec would rise how high from its lowest point of its swing
  18. 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?
  19. physics

    What is the frequency of the second hand of a clock, assuming it is keeping correct time? Select one: a. 1 Hz b. π/3 Hz c. 0.0167 Hz d. 60 Hz
  20. physics

    The two sets of magnetic-field coils,used to form the pictures on the screen, are _______ to each other. Parallel or perpendicular
  21. 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)?
  22. general physics

    If wind blows at 30 m/s over a house, what is the net force on the roof if its area is 300 m^2 and is flat?
  23. physics

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

    A ball starts 1.175 meters off the ground and shot at an angle of 40 degrees with a velocity of 3.2 m/s. Where does it land?
  25. 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 .
  26. Physics

    What is the pressure at a depth of 80 m in the ocean? The density of seawater is 1. 03 × 10 3kg/m3. Please express your answer in units of atm.
  27. Physics

    What is the pressure at a depth of 80 m in the ocean? The density of seawater is 1. 03 × 10 3kg/m3. Please express your answer in units of atm.
  28. Physics

    A stone is thrown vertically upward, after't'second it covers a distance of's' metre, where 's'=80t-16t2. It's velocity after 2 second?
  29. Physics

    A 822 kg car accelerates from rest to 101 km/h in 1.15s. What change in momentum does the force produce?
  30. physics

    An elevator weigting 400 kg/s is to be lifted up at a constant velovity of 3cm/s.what would be the minimum power of the motor to be used ?
  31. 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?
  32. Physics

    An object is dropped from a platform100 ft high. Ignoring wind resistance, how long will it take to reach the ground?
  33. physics

    a stone is thrown vertically upward with an initial velocity v0. the distance travelled by it in time 1.5v0/g
  34. physics

    he speed of light in a vacuum is about 3.00 108 m/s how many kilometers a pulse from a laser beam travels in exactly 3.9 hours.
  35. physics

    a 70.o kg student runs up a 5.00 meter high stairway in a time of 5 seconds. how many watts of power did she develop?
  36. physics

    A ball its thrown straight up into the air at 50 m/s find the balls velocity after 8 seconds show all work please
  37. Physics

    A block weighing 9.7 N requires a force of 2.6 N to push it along at constant velocity. What is the coefficient of friction for the surface?
  38. physics

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

    In a panic-stop, a car's brakes produced an acceleration of -8.0 m/s2 (or a deceleration of 8.0 m/s2). If you are traveling at 35 m/s, your speed after braking for 3.0 s will be
  40. 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?
  41. physics

    the current to an LC circuit is being supplied according to the function I(t)=2*sin(7t). what is the smallest value of t for which the inductor and capacitor each contain half of the energy?
  42. 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
  43. physics

    Calculate the speed of a satellite moving in a stable circular orbit about the Earth at a height of 5400km.
  44. PHYSICS

    'show that a 2.5m length of wire with cross section area 0f 1.0mm and resistance of 0.75ohms has a resistivity o f 3.0 ×10-7'
  45. physics

    A speedboat increases in speed from 19 m/s to 31.4 m/s in a distance 193 m. Find the magnitude of its acceleration. Answer in units of m/s
  46. Physics

    An automobile tire is rated to last for 50000 miles. To an order of magnitude, through how many revolutions will it turn over its lifetime?
  47. physics

    a block with a velocity 4m/s slides 8m across a rough horizontal floor before coming to rest.the coefficient of friction is.
  48. physics

    The displacement from the equilibrium caused by a wave on a string is given by: y(x, t) = (-0.00200 m) sin [40 m-1)x – (800 s-1)t]. What are the number of waves in 1 m
  49. 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?
  50. TVTC

    Physics...a diver of mass m drops from a board of 10m above water surface. find his speed at 5m
  51. physics

    A football is kicked with a velocity of 31 m/s at an angle of 41. What is the ball's acceleration in the vertical direction as it flies through the air?
  52. Physics

    Calculate the power output of a 1.5 fly as it walks straight up a windowpane at 2.2 P=__W (2 sig figs)
  53. Physics

    lightning strikes a tower 4 km away. how long after the strike will you hear the thunder? the speed of sound is 344 m/s
  54. Physics

    Calculate the heat energy needed to change the temperature of 2 kg of copper from 10°C to 110°C. I forgot the formula
  55. 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?
  56. 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!!!
  57. 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?
  58. Physics

    What minimum speed does a 100 g puck need to make it to the top of a 5.9 m-long, 29 degree frictionless ramp?
  59. 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
  60. Physics help

    how would you investigate if the half life of water dripping from a burette is constant? I know the method but what equation and principle would ya'll use?
  61. Physics

    A dog throws a bone into the air at 17.2 m/s...How high will it rise and How long will it take to reach the peak of its trajectory?
  62. PHYSICS

    A 3.1 kg bundle starts up a 30° incline with 139 J of kinetic energy. How far will it slide up the plane if the coefficient of friction is 0.30?
  63. Physics

    Two objects, each with a charge of +3·10-6 C, are located 7 m apart. What is the electric force between them? Use coulombs equation: I will be happy to critique your work.
  64. physics

    If the potential difference between a cloud and the ground is about 17 , how much charge is transferred in a lightning bolt that releases 1.2 of energy?
  65. Physics (Heat)

    Sitting under the fan on a hot day makes us feel cool.why? Give reason
  66. physics

    Two ants race across a table 63 cm long. One travels at 5.14 cm/s and the other at 3 cm/s. When the first one crosses the finish line, how far behind is the second one? Answer in units of cm
  67. 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
  68. physics help

    how much work must be done to raise a 5kg block of steel from the ground to a height of 2m (in Joules) in the absence of friction?
  69. Physics

    I was just wondering, since cathode ray tubes arent being made, are the only types of TVs available the plasma and the LCD?
  70. Physics

    A 1.5 N force acts on a .20 kg cart so as to accelerate it along a frictionless track. If it is accelerated from rest, how fast is it going after .3m? The answer given is 2.12 m/s but I am not sure how to get to that.
  71. Physics

    A stopped 100okg car exerts 160kW of power as it accelerate. If it is only 75% efficient, how far will it travel in 4 seconds?
  72. PHYSICS

    What's the total mechanical energy of a 300kg satellite in circular orbit 1400km above Earth's surface?
  73. 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
  74. Physics

    mike is skiing downhill at a 25 degree angle. if his weight is 350N assuming there is no friction what is his acceleration
  75. Physics

    How long would it take a fighter jet to accelerate from 0 to 250m/s if the force from the engine was 180000N and the mass was 10000kg ? please help please
  76. chemistry, physics

    How would you be able to utilize a calorimeter to determine the specific heat of substance that has a lower density than water?
  77. Integrated Physics and Chemistry

    Energy that is dissipated during heat flow cannot usually be used to produce work. True False
  78. physics

    a bullet penetrates 7 cm into a block of wood when fired at a speed of 33 m/s. Find the deceleration and the time taken to stop
  79. physics

    A copper wire has a diameter of 1.532 mm. What magnitude current flows when the drift velocity is 0.500 mm/s?
  80. Physics

    If the coefficient of kinetic friction is 0.25, how much work do you do when you slide a 45 kg box at constant speed across a 5.8m -wide room?
  81. physics

    what minimum speed does a 100g puck need to make it to the top of a 3m long 20degree frictionless ramp?
  82. St. Basil's school. Physics

    The time period of two pendulums are 1.44s and 0.36s respectively. Calculate the ratio of their lengths.
  83. physics

    3. If a man does 300 j or work by pushing a table 2.0 m across the room, what was the magnitude of the applied horizontal force?
  84. Physics

    A vehicle moves in a straight line with an acceleration of 2 km/h^2. By how much does the speed change each second? Answer in units of km/h. Plz help?
  85. 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
  86. Physics - waves

    What is the source of wave motion? I would think it would be an object such as a rock dropping in the water. How this translates into an answer, however, I'm not sure. :-)
  87. Physics

    a bus moving at a speed of 20m/s begins to slow at a constant rate. Find how far it goes before stopping?
  88. physics

    An object is dropped from rest at a height of 112 m. Find the distance it falls during its final second in the air. m
  89. Physics (Online w/ no teacher)

    Find the change in the force of gravity between two planets when the distance between them is decreased by a factor of 5.
  90. physics

    Assistance required as to why visible light is not emitted when infrared radiation falls on fluorescent materials.
  91. Physics

    You drill a well to a depth of 100-m. Find the difference in water pressure, comparing the top and bottom of the well
  92. 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?
  93. 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.
  94. Physics

    Why do some cooks put ice in the pot to cook meat? Explain then prove your answer by solution.
  95. physics

    Using a small pendulum of length 0.171 m, a geophysicist observes that it completes 1 cycle every 0.833 s. What is the value of g at his location?
  96. physics

    A small motor runs a lift that raises a load of bricks weighing 916 to a height of 12.7 in 28.2 .
  97. 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. .
  98. URGENT! PHYSICS

    HI! I searched on a lot of websites for this, but none of them actually was right for me. I need to do an egg drop withh only straws and glue/tape. Thanks!
  99. 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?
  100. physics

    a waterfall is 122 m in height. calculate the rise in temperature if all potential lost is converted to heat.