Physics

  1. Physics
    A camera with a telephoto lens of focal length 125mm takes a picture of a 1.8m tall woman standing 5.0m away. (1). What must be the distance between the film and the lens to get a properly focused picture? (2). What is the magnification of the image (3). What is the size of ...
  2. Physics
    An observer traveling with a constant velocity of 20m/s passes close to a stationary source of sound and noticed that there is a change of frequency of 50Hz as he passes the source.What is the frequency of the source? (Speed of sound in air=340 m/s)
  3. ap physics help please
    In the methane molecule, CH4, each hydrogen atom is at a corner of a regular tetrahedron with the carbon atom at the center. In coordinates for which one of the C-H bonds is in the direction of i + j + k, an adjacent C-H bond is in the i - j - k direction. Calculate the angle ...
  4. Physics
    The formula is x = 1/2 at^2 and I have managed to fill in the variables as this. d = 1/2 9.81 m/s^2 1^2 I want to say that my answer is 4.905 but I'm unsure. Can someone check it?
  5. Physics
    An isotropic point source has an intensity of 300Cd. Calculate the amount of luminous flux emitted by the source.
  6. Physics
    Determine the resolving power of a telescope,if the objective of a telescope has a diameter of 300mm.The mean wavelength of the light from Stars is 6*10^-7m.
  7. Physics
    1. A fruit drops from the top of a tree 20m tall, the time it takes the fruit to reach the ground level is?
  8. physics
    The efficiency of a machine is 75%.If this machine raises a load of 150kg through a vertical height of 20cm,Calculate the workdone by labourer using the machine
  9. Physics
    A camera with a telephoto lens of focal length 125mm takes a picture of a 1.8m tall woman standing 5.0m away. (1). What must be the distance between the film and the lens to get a properly focused picture? (2). What is the magnification of the image (3). What is the size of ...
  10. Physics
    If you have swam one lap in a swimming pool, that means you have swam from one end to the other and back. In 2 h, a swimmer makes exactly 58 laps in a swimming pool that is 47 m long. Determine the distance the swimmer traveled, the total displacement of the swimmer, the ...
  11. Physics
    A small omni directional source of noisy sound emits uniformly with a power of 40W.Determine the distance from the source for which the sound level is 90dB. Calculate also the intensity level at a point 100m from the source. (if there is no absorption)
  12. Physics
    as observer travelling with a constant velocity of 20m/s passes close to a stationary source of sound and noticed that there is a change of frequency of 50Hz as he passes the source. What is the frequency of the source? (speed of sound in air=340m/s)
  13. Physics
    A ball of mass m 5 1.80 kg is released from rest at a height h 5 65.0 cm above a light vertical spring of force constant k as in Figure P5.66a. The ball strikes the top of the spring and compresses it a distance d 5 9.00 cm as in Figure P5.66b. Neglecting any energy losses ...
  14. Physics
    A cyclist is stopped at a traffic light. When the light turns green, the cyclist accelerates at 3.2 m/s. After 2.4 seconds, what is the cyclist’s speed?
  15. Physics
    what is the critical angle for light passing from(n=1.54) to (n=1.33)
  16. Physics
    what is the critical angle for light passing from(n=1.54) to (n=1.33)
  17. Physics- refraction
    Hi, We had a lab on refraction. They gave us a print out of the word carbon dioxide and placed it under a test tube. The letter a and r in the word carbon flipped in the experiment. I wanted why is it that only these 2 letters flipped and not the others?
  18. Physics
    Please show steps for this - I need it before my test this Friday - Im really desperate! A firecracker travels straight up at 75.0 m/s and explodes into two pieces. The smaller piece carries one third of the firecracker’s mass and shoots off horizontally at 48.0 m/s ...
  19. physics
    Please help me understand with steps, I really don't get it A square plate has a side length of 1.20 m. A 24.0-N ~ m torque is applied about an axis perpendicular to the plate through its center. If it experiences an angular acceleration of 6.25 rad/s2, calculate the mass of ...
  20. physics
    4. A 1500 kg car starts from rest and drives around a flat 50 m diameter circular track. The forward force provided by the car’s wheels is a constant 1000 N. a. What are the magnitudes and direction of the car’s acceleration at t = 10 s? b. If the car has rubber tires and ...
  21. physics
    does acceleration change when a lift is moving
  22. physics
    1. Henry gets into an elevator on the 50th floor of a building and it begins moving at t = 2s. The figure shows the his apparent weight over the next 10 s. a. Is the elevator’s initial direction up or down? Explain clearly how you arrived at this conclusion. b. What is Henry...
  23. physics
    A body is projected at an angle of 30 degree with the horizontal at initial speed of 200m/s. In how many seconds will it reach the ground? How far from the point of projection will it strike?
  24. physics
    At the entrance channel of a harbor, the tidal current has a velocity of 4.22 km/hr in a direction 17.4o south of east. Suppose a ship caught in this current has a speed of 17.5 km/hr relative to the water. If the helmsman keeps the bow of the ship aimed north, what will be ...
  25. physics
    Three blocks are located on a horizontal frictionless table. They are connected by a massless cord, as shown in the figure, and pulled to the right. The masses of the three blocks are m1 = 45 kg, m2 = 39 kg, and m3 = 50 kg. The pulling force is equal to T3 = 46 N.
  26. physics
    On a winter day with the temperature hovering near freezing, the coefficent of static friction between the tires and an icy road is 0.27. What is the maximum incline that a four-wheel drive vehicle can climb with zero acceleration?
  27. physics
    3.92 kg block located on a horizontal floor is pulled by a cord that exerts a force F = 11.5 N at an angle theta = 15.5o above the horizontal, as shown in the Figure. The coefficient of kinetic friction between the block and the floor is 0.09. What is the speed of the block 5...
  28. physics
    A block with mass m = 19.1 kg slides down an inclined plane of slope angle 18.2 o with a constant velocity. It is then projected up the same plane with an initial speed 2.05 m/s. How far up the incline will the block move before coming to rest?
  29. physics
    Two blocks with masses m1 = 24.6 kg and m2 = 60.0 kg, shown in the figure, are free to move. The coefficient of static friction between the blocks is 0.67 but the surface beneath m2 is frictionless. What is the minimum force F required to hold m1 against m2?
  30. Physics
    A tension of 6000 newtons is experienced by the elevator cable of an elevator moving upward with an acceleration of 2m/s^2. what is the mass of the elevator
  31. Physics
    a ball is released from the top of a 67.0 m high building. At the same instant a second ball is shot straight up from the ground with an initial speed of 20.0 m/s, directly below the point where the first ball was dropped. Ignore air drag and calculate a. the height above the ...
  32. Physics
    Earth is a spherical body, of radius 6,376 km, which completes a full rotation about its axis in 24.0 h. how long (in hours) should the day on Earth be so that a person at the equator is able to float freely above the ground?
  33. Physics
    A square plate has a side length of 1.20 m. A 24.0-N ~ m torque is applied about an axis perpendicular to the plate through its center. If it experiences an angular acceleration of 6.25 rad/s2, calculate the mass of the plate.
  34. Physics
    A firecracker travels straight up at 75.0 m/s and explodes into two pieces. The smaller piece carries one third of the firecracker’s mass and shoots off horizontally at 48.0 m/s west. Determine the speed and direction of the other piece directly after the explosion.
  35. Physics
    A wodden block weighing 200 g is attached to a hanging weighing 45 g with a fine thread . The block is placed on a frictionless surface and after passing thrad over a smooth pulley , hanger is allowed to pull the block . Find the acceleration of the system and tension in the ...
  36. physics
    mass is a quantity unit rate magnitude. unit?
  37. physics
    which is longer 1 meter or 1 centimeter? 1 meter 1 centimeter they are equal 1 meter??/
  38. physics
    A force acts for 5 seconds on a body of mass 5.2 kg initially at rest. The force then ceases to act and the body moves with a speed of 3m/s find magnitude of force
  39. Physics
    A stone is drop from a height 19.6m above the ground while a second stone is simultaneously projected from the ground with sufficient velocity to enable it to accept 19.6m. When and where the stone will meet
  40. Physics
    Three balls of mass m1,m2and m3 are lying in straight line. The first ball is moved with certain velocity so that is strikes the second ball directly and itself come to rest the second ball collides with the third and is itself comes to rest if 'e'be the coefficient of ...
  41. PHYSICS
    When the brake are applied to a moving car travelling 60km\hr it decelerate at uniform rate of 5m\s
  42. physics
    the movement of a couple of 100N but 2.5m apart is
  43. physics
    At the entrance channel of a harbor, the tidal current has a velocity of 4.22 km/hr in a direction 17.4o south of east. Suppose a ship caught in this current has a speed of 17.5 km/hr relative to the water. If the helmsman keeps the bow of the ship aimed north, what will be ...
  44. Physics
    If train travelling 72kmph is to be brought to rest distance of 200m then its retardation should be
  45. Physics
    A progressive wave equation is given by y=a sin (200(pie)t -(pie)x/17)
  46. math, English, geography, chemistry, physics, economics, l
    the number 1 to 20 are written on pieces of paper and put in the box. if a piece of paper is picked at random, what is the probability of picking a paper with: an odd number, a prime number, a multiple of 3 and a square number
  47. math, English, geography, chemistry, physics, economics,
    the number 1 to 20 are written on pieces of paper and put in the box. if a piece of paper is picked at random, what is the probability of picking a paper with: an odd number, a prime number, a multiple of 3 and a square numbe
  48. physics
    how much power does a 63kg athlete develops as he climbs a 5.2m rope in 3.5 second
  49. PHYSICS
    an oil drop forms a circular of area 1.4cm2 and volume of 5times10cm3 calculate the diameter of the oil molecule ?
  50. Physics
    A golf ball having an initial speed of 50m/s with an angle of 30 degree what is time of flight and range and velocity it which it hits the ground at the end of flight
  51. Physics
    Three point charges are located at the corners of an equilateral triangle(q1=2microC,q2=-4microC).Calcula​te the resultant electric force on 7microC charge.
  52. physics
    (1 pt) Which of the following statements is true? (Give all correct answers, i.e., A, C, AE, ABCD . . .) A) An object with a constant speed can not accelerate. B) When the velocity is constant, the average velocity over any time interval can not differ from the instantaneous ...
  53. physics
    A bus moves from rest with a uniform acceleration of 2m/s(square) for the first 10s. It then accelerate at a uniform rate of 1m/s(square) for another 15s, it continues at constant speed for 70s and finally comes to rest in 20s by uniform deceleration.Draw the velocity time ...
  54. Physics
    Can someone help me with these questions? I don't want the answers just some direction in how to solve them. A motorcycle at a stoplight takes 4.22 seconds to accelerate to 28.0 m/s after the light turns green. What is its average acceleration? An object that starts at rest ...
  55. PHYSICS
    Calculate a constant force required to bring an object of mass 2.0kg.moving with a velocity of 4.0m/s to rest in. 0.1sec and 2metre
  56. Physics
    A boy is moving on a straight road against a frictional force of 5 N. After travelling a distance of 1.5 km he forgot the correct path at a round about of radius 100 m. However, he moves on the circular path for one and half cycle and then he moves forward upto 2 km. Calculate...
  57. physics
    a photographer inside a helicopter which is descending vertically at 15m/s at an altitude of 55 meters accidentally dropped his camera. how long will it take the camera to reach the ground.
  58. Physics
    A car moving at 89 km per hour is subjected to a retardation to brought to rest in 70 second. Find retardation and distance
  59. Physics
    A tug tows a small boat with a rope inclined upwards at 30 degrees to the horizontal. The tension in the string is 2000 newton. What is the force tending to raise the boat out of water
  60. physics
    A regulation volleyball court is L = 18.0 m long and a regulation volleyball net is d = 2.43 m high. A volleyball player strikes the ball a height h = 1.74 m directly above the back line, and the ball's initial velocity makes an angle theta = 31o with respect to the ground.At ...
  61. Physics
    A polar satellite is launched at 850km above earth. Find orbital speed.
  62. Physics
    A polar satellite is launched at 850km above earth.Find its orbital speed.
  63. physics
    Suppose you throw a stone straight up with an initial velocity of 18.0 m/s and, 0.5 s later you throw a second stone straight up with the same initial velocity. The first stone going down will meet the second stone going up. At what height above the point of release do the two...
  64. physics
    2 identical spacecraft leave Earth at the same velocity but in different directions. If the velocity of each spacecraft was 0.84c, what value would an observer on Earth obtain when he calculated their relative velocities?
  65. physics
    A wire carries a current I. At a distance of 6mm from the wire, the magnetic field strength is 0.004T. find the magnitude of current I.
  66. physics
    How do I understand all the basics of physics? I am sorta confused on like kinetic energy and watts.
  67. Physics
    A wheel rotates without friction about a stationary horizontal axis at the center of the wheel.A constant tangential force of 75N is applied to the rim of the wheel.The wheel has a radius of 0.13m.The wheel has an angular speed of 14.5rev/s after 3.70s.What is the momentum of ...
  68. physics
    A car on the highway travels at 90 km/hr. Express this speed in m/s. can yall show me how to convert this
  69. Physics
    Electrons with a speed of 1.1×10^6 m/s pass through a double-slit apparatus. Interference fringes are detected with a fringe spacing of 2.0 mm. What will the fringe spacing be if the electrons are replaced by neutrons with the same speed? (in μm)
  70. physics
    You must have seen actors in Hindi films jumping over huge gaps on horse backs and motor cycles. In this problem consider a daredevil motor cycle rider trying to cross a gap at a velocity of 100 km h–1. (Fig. 4.13). Let the angle of incline on either side be 450. Calculate ...
  71. Physics
    A uniform horizontal beam 300N 5m long is suspended vertical from its two end by a rope, if a 600N person stands in 1.5m from its left end find the tension in each end of the rope.
  72. Physics
    three point charges 4nC , 4nC and -3nC are placed at vertices of an equilateral traingle of side 0.20 m. calculate the net electric field at the centriod of the triangle
  73. Physics
    the length of an aluminum is 76.5cm and that of an iron ruler is 80cm at 0 degree celsius at what temperature will the length of the rules become
  74. Physics
    the length of an aluminum is 76.5cm and that of an iron ruler is 80cm at 0¡ãc. at what temperature will the length of the rules become
  75. Physics
    A parallel-plate capacitor with air between the plates has an area A= 2.00 x 10^-4 m^2 and a plate separation d = 1.00 mm. Find its capacitance.
  76. physics
    what is the mechanical advantage of simple machine 78%efficient
  77. Physics
    A 28 g block sits at the center of a turntable that rotates at 60 rpm. A compressed spring shoots the block radially outward from the center along a frictionless groove in the surface of the turntable. Calculate the turntable's angular speed when the block reaches the outer ...
  78. Physics
    Two point charges +Q and -Q of mass m are placed on the ends of a massless rod of length L, which is fixed to a table by a pin through its center. If the apparatus is then subjected to a uniform electric field E parallel to the table and perpendicular to the rod, find the net ...
  79. Physics
    I have a serious problem. I have worked on the basics of Physics and STILL DON'T GET IT!!! I have done a bunch of problems, and have no way to get past this bump. (More like mountain.) Anybody have ideas?????
  80. PHYSICS
    A Boy Stand At A Certain Distance From A Large Building And Blow A Whitle After 2.3s He Hear It Echo.He Move 50m Toward The Building And Blow He Whitle Again, This Time It Echo Reach Him After 2.0s.Calculate The(1)boy Original Distance From The Building (2)the Speed Of Sound ...
  81. Physics
    Three charges q1= 2uc(0,0)cm q2=4uc(0,10)cm and q3=_3uc(15,0)cm acts on one another, find the magnitude of the total electric force and the angle that the total electric force makes with positive x_axis.
  82. Physics/Fluids
    Hi! I'm having a hard time figuring out if flow rate decreases when water goes up a vertical pipe. I know that at some point when the water can't be pushed any higher due to P=pgh, the water stops flowing from the pipe. I also believe that due to continuity, all sections of ...
  83. Physics
    Precaution for sliding friction and static friction?
  84. Physics
    A particle executes S.H.M with amplitude of 10cm and period of 10s. Find the velocity and acceleration of the particle at a distance 5cm from the equilibrium position
  85. physics
    using dimention show that 1joile =10 eag
  86. Physics
    Before railroad were invented, goods often traveled along canals, with mules pulling barges from the bank. If a mule is exerting a 12,000N force for 10km, and the rope connecting the mule to the barge is at a 20 degree angle from the direction of travel, how much work did the ...
  87. Physics
    Hydroelectricity is generated by storing water behind a dam, and then letting some of it run through generators in the dam to turn them. If the system is the water, what is the environment that is doing work on it? If a dam has water 100m deep behind it, how much energy was ...
  88. Physics
    A 5kg rock falls off of a 10m cliff. If air resistance exerts a force of 10N, what is the kinetic energy when the rock hits the ground? A. 400J B. 12.6m/s C. 100J D. 500J
  89. Physics
    You do 30J of work to load a toy dart gun. However, the dart is 10cm long and feels a frictional force of 10N while going through the dart gun's barrel. What is the kinetic energy of that fired dart? A. 30J B. 29J C. 28J D. 27J
  90. Physics
    Old fashioned pendulum clocks are powered by masses that need to be wound back to the top of the clock about once a week to counteract energy lost due to friction and to the chimes. One particular clock has three masses: 4kg, 4kg and 6kg. They can drop 1.3 meters . How much ...
  91. Physics
    A spring with a force constant of 5000N/m and a rest length of 3m is used in a catapult. When compressed to 1m, it is used to launch a 50kg rock. However, there is an error in the release mechanism, so the rock gets launched almost straight up. How high does it go, and how ...
  92. Physics
    You have a 120g yoyo that you are swinging at 0.9m/s. How much energy does it have? How high can it get above the lowest point of the swing without your doing any additional work, or Earth? How high could it get on the Moon, where gravity is 1/6 Earth's?
  93. Physics
    You are launching a 2-kg potato out of a potato cannon. The cannon is 1.5m long and is aimed 30 degrees above the horizontal. It exerts a 50N force on the potato. What is the kinetic energy of the potato as it leaves the muzzle of the potato cannon?
  94. Physics
    A model drag car is being accelerated along its track from rest by a motor with a force of 75N, but there is a drag force of 30N due to the track. What is the Kinetic energy after 2m of travel? A. 90J B. 150J C. 210J D. 60J
  95. Physics
    You are participating in the Iditarod, and your sled dogs are pulling you across a frozen lake with a force of 1200N while a 300N wind is blowing at you at 135 degree from your direction of travel. What is the net force, and will your kinetic energy increase or decrease?
  96. Physics
    A force of 40N stretches a wire through 3cm.What force will stretch it through 5.0cm and through what length with a 100N stretch it?
  97. Physics
    A Ferris wheel with radius 9.5 m initially rotates at a constant rate by completing 0.75 rev in 25.00 s. It then begins to decelerate at a rate of 0.30 rad/s2 with its only passenger at the top of the wheel. Find the direction of the total acceleration vector. Express your ...
  98. Physics
    A child pushes tangentially on a small hand driven merry- go- round. She is able to accelerate it from rest to 16 rpm in 10 s. Modeling the merry go round as a uniform disk of radius 4.0 m and mass 770 kg, find the torque required to produce that acceleration. Neglect the ...
  99. Physics
    Consider the figure above consisting of three particles of mass m attached to a massless rod. Given an axis of rotation through point P, the rod rotates as shown in the figure. If the rod is released from rest in the horizontal position at t = 0. What is the angular ...
  100. Physics
    Consider the figure above, where a rigid beam of negligible mass and 10 m long is supported by a cable attached to a spring. When NO block is hung from the beam, the length L (cable-spring) is equal to 5 m. Assume that immediately after block (weight of 260 N) is hung at the ...
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