physics please HELP !

74,641 results, page 69

  1. physics

    A small tiny nail may Pierce an inflated Tyre and remain there without pressure reduction.explain
  2. Physics

    A traffic light is hanging from two cables tilted at 37 and 42 degrees. If it has a mass of 2.3 kg find the tension in each cable.
  3. Physics

    Describe alpha, beta, and gamma rays. What exactly is each ray composed of? What are their characteristic radiation characteristics?
  4. Physics

    Find the attracting force between 2 people sitting .08 meters apart. One person has a mass of 62kg and the other 80kg.
  5. maths, geography, physics, chemistry

    A cuboid has TSA 40 sq. m and latral surface 26 sq. m. Find the base area.
  6. 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
  7. physics

    A centrifuge accelerates uniformly from rest to 18000 rpm in 180 s. Through how many revolutions did it turn in this time?
  8. physics

    A ball droppred from a tall building find the balls velocity after 7 seconds show all works please
  9. physics

    The mass of a pendulum moves a total horizontal distance of 14cm in one cycle. What is the amplitude of the vibration?
  10. physics

    200g of steam at 110°C is condensed, and the resulting water is frozen into ice at 0°C. How much heat was removed?

    1. A 500.0 g metal block absorbs 1.125 × 104 J of heat to raise its temperature by 50.0 K. What is the substance?
  12. Physics

    Three resistors 2.5 Ù, 3.5 Ù and 4 Ù are connected in parallel. What is the equivalent resistance? I know you must use 1/Req = 1/R1 + 1/R2 + 1/R3 But then I get .935 and I don't think that's correct. What am I missing? Thanks
  13. Physics

    What is the magnetic effect of placing two wires with equal but oppositely directed currents close together or twisted about each other?
  14. physics

    Two point charges of magnitude +3.0 nC and +2.0 nC respectively are placed 2.0cm apart. Calculate the resultant electric field strength at their midpont E= E1 + E2
  15. Physics

    How do I solve this question: What is the resistance of a laptop computer that has an 11V battery & requires 15W of power?
  16. 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.
  17. Physics

    In terms of Ohms Law (V=IR), when plotting a graph of V against I, is it safe to say that the line passes through the origin, even though 0/0 does not exist?
  18. Physics

    An 1800 kg helicopter rises with an upward acceleration of 2.0 m/s2. What lifting force is supplied by its rotating blades?
  19. physics

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

    please help The power rating of an electric motor which draws a current of 5 amperes from a 240-volt line is? a. 12.0 kW b. 1.2 kW c. 48.0 kW d. 4.8 kW
  21. physics

    The pulley is light and frictionless. Find the mass M1, given that M2 (7.00 kg) is moving downwards and accelerates downwards at 3.01 m/s2, that θ is 15.0°, and that μk is 0.270.
  22. physics

    In a new scenario, the block only makes it (exactly) halfway through the rough spot. How far was the spring compressed from its unstretched length?
  23. Physics

    Assuming that your lungs can function when under a pressure of 11 kPa, what is the deepest you could be under water and still breathe through a tube to the surface?

    Calculate the maximum amount of stretching (in percent) that a piece of steel can undergo before breaking under tension
  25. physics

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

    Calculate the centripetal force on a 2100 kg carrounding a curve of 175 m radius at a speed of 60 kph.
  27. physics

    A car travels in a straight line for 4h at a constant spped 73km/h. What is its acceleration? Answer in units m/s^2
  28. 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?
  29. physics

    What is the gravitational potential energy of a 300.0 g coffee cup sitting on a table top 1.25 m above the floor?
  30. Physics

    A car accelerates from rest at 2.9 m/s^2. How much time does it need to attain a speed of 4 m/s? Answer in units of s. are you supposed to divide 2.9 by 4?
  31. physics

    Which principle can be applied to explain what happens to the pitch of a sound as the source comes closer and close,pass the listener and away?
  32. physics

    a car starts from rest and has a constant acceleration of 2.5 m/s^2. if it travels 25m how long will it take to complete the motion
  33. 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. .
  34. Physics

    An observer on Earth sees you travel 1000 m at half the speed of light. What distance do you think that you travelled?
  35. 11th grade Physics

    What happens when an insulator is wired in series with the bulb? Is trhe swich open or closed?
  36. Physics

    consider a pair of planets that find that the distance between then is decreased by a factor of 5. Show that the force between them becomes 25 times as strong.
  37. physics

    hummingbird beats wings with frequency of 80.0 Hz. What is period of bird's flaps? I know T = 1/f , but what is the label/units for the answer?
  38. physics

    A weight suspended from a spring is seen to bob up and down over a distance of 50 centimeters 2 times each second. What is its frequency? What is its period? What is its amplitude?
  39. physics

    Explain the interference due to thin flims and ahows that the reflected and transmitted systems are complementary to each other.
  40. physics

    how large a fore (in newtons) is needed to accelerate a 5 metric-ton vehicle from rest to a speed of 10 km/hr in 4 s?
  41. Physics

    A pan filled with hot food cools from 94°C to 86°C in 2minutes when the room temperaturs is at 20°C .How long will it take to cool from 71°C to 69°C ?
  42. 11th grade Physics

    What is the current produced by a potential difference of 240 volts through a resistance of 0.2 ohms?
  43. physics

    Why do many musicians wear earplugs during their performances even though the intensity of the sounds produced is lower than the threshold of pain?
  44. 11th grade Physics

    What is the potential difference if a resistance of 25 ohms produce a current of 250 amperes?
  45. Physics Dynamics

    An arrow has an initial launch speed of 32 m/s. If it must strike a target 38 m away at the same elevation, what should be the projection angle?
  46. 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?
  47. Physics Honors

    A pitcher throws a fast ball horizontally at 42.1 m/s How far does it drop before crossing the plate, 18.3 meters away?
  48. physics

    A positive and a negative charge, each of magnitude 1.7 10-5 C, are separated by a distance of 11 cm. Find the force on each of the particles. what formula do i use?
  49. Physics

    Describe the structure of an atom, the quantised shell model and how it produces absorption and emission spectra.
  50. physics

    2.A plank is tilted slowly to an angle of 30 degrees with a 12 pound block on it Find FN, FF and the static friction?
  51. 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
  52. Physics 20

    A vehicle is involved in a collision that produces a -1500 n net force. what is the acceleration of the 75.5 kg passenger in the car?
  53. physics

    harry takes a space voyage and returns to find his twin sister has aged more than he has. This is evidence that they have been in different?
  54. physics

    you slide down a pole at a mass of 80kg with an acceleration of 4m/s^2, How do you show that the friction force that acts on you is 480N?
  55. Physics

    a particular jet aircraft must reach a speed of 80 m/s in order to take off. If the runway is 1500 m long, determine the acceleration
  56. physics

    A car traveling 28 mi/h accelerates uniformly for 6.7 s, covering 555 ft in this time. What was its acceleration? Answer in units of ft/s 2
  57. Physics

    What is the escape speed of an electron launched from the surface of a 1.5 cm diameter glass sphere that has been charged to 10 nC? Which equation(s) would I use?
  58. physics

    Mitch carries a large cat from one end of his bedroom to the other.does he do any work?if not why? if so,what energy change is occurring?
  59. physics

    The resistivity of silver is 1.59 × 10-8 Ω·m. What is the resistance of a section of 12 gauge wire (diameter 0.2057 cm) that is 8.60 m long?
  60. physics

    What is the angular separation between the first-order images on either side of the central maximum? Answer in units of degrees.
  61. physics

    Two springs have force constant K1&K2 (K1>K2) .each spring is extended by same farce F. If their elastic potential energy are E1&E2then E1/E2)is?
  62. 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?
  63. Physics

    Vector A has magnitude 37 units and direction, counterclockwise from east, of 12.9 degrees. What is the value of its x component to 1 decimal place?
  64. physics

    when you do work to push an object horizonatally on a frictionless surface what energey change is taking place?
  65. Physics

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

    Explain in terms of the conservation of momentum why the ratio of the masses of a bullet and a gun must be carefully considered
  67. 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
  68. physics 112

    what is meant by a change in temp of 1 degree celcius on the scale of a platinum resistance thermometer
  69. TVTC

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

    Two point charges 1.5 cm apart have an electric potential energy -150 mu J. The total charge is 34 nC. what are q_1 and q_2?
  71. Physics

    What is the formula for the force experienced by a moving charge q whose velocity v forms an angle è with a magnetic field B?
  72. physics

    a 200N sign is held by two wires that have 150 degree angle between them. find the tension in each wire.
  73. Physics

    Draw a FBD of an object that has forces acting on it that are not at right angles. If someone can provide me of some sort of example of what situation could represent this i would appreciate it.
  74. physics

    A square conducting slab with 7 m sides carries a net charge of 89 mu or micro CC. what is the electric field?
  75. physics

    Determine the stopping distances for a car with an initial speed of 93 km/h and human reaction time of 3.0 s for the following accelerations: -4.00 m/s^2 -8.00 m/s^2
  76. physics

    true of false- if you only want a small volume of hot water, you should place the immersion heater near the bottom?
  77. physics

    How much current is drawn by a television with a resistance of 21 that is connected across a potential difference of 120 V? 5.45A wasn't right
  78. Math/Physics

    If I have 24 inch Diameter tires that rotated 101 times in 15 seconds, how do I find out how fast they were going?
  79. Physics

    The brakes of a bike (with a person) having a mass of 63 kg, reduces it's velocity from 8.5 m/s to 0 m/s in 3.0 seconds. What is the magnitude of braking force?
  80. Physics

    How many times will the incident beam shown in Figure P25.3 (x = 1.90 m, y = 1.30 m) be reflected by each of the parallel mirrors? mirror on the right
  81. Physics

    A satellite that is 4175 miles from the center of the earth, orbits with a period of 90 minutes. What is its centripetal acceleration?
  82. Physics

    If a person can have a hang time of .75 seconds, how long would it take that individual to go from the ground to the highest point of their jump?
  83. physics

    Two forces of the same magnitude act at a point.the square of their resultant is 3 times the product of their magnitudes.the angle between them is?
  84. physics

    An object sits 29m above the ground and has a mass of 47 kg. How much potential Energy does it posses 1.5 seconds after falling?
  85. Physics

    Describe alpha, beta, and gamma rays. What exactly is each ray composed of? What are their characteristic radiation characteristics?
  86. physics

    dave is traveling in his car at 16m/s. he maintains this speed for 60 seconds. what is his acceleration in meters per second squared?
  87. physics

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

    determine the amount of heat generated per minute by a 120 volt lamp which takes 0.5 amperes. thanks!
  89. AP Physics

    Two locomotives approach each other on parallel tracks. Each has a speed of v = 85 km/h with respect to the ground. If they are initially d = 7.0 km apart, how long will it be before they reach each other?
  90. 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
  91. 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
  92. 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
  93. 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?
  94. physics

    Given that the power consumed by a device is 1000 W operating on a 70-V line, calculate the amount of current it draws.
  95. physics

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

    A bouncing ball returns to the same height each time. Is this an example of simple harmonic motion? Explain your answer.
  97. physics

    a stone of mass 50g is released from rest, Calculate it's kinetic energy after 6s from the beginning of the motion
  98. Physics

    A wave with frequency 12.2Hz and amplitude 47.7 mm moves in the positive x direction with a speed of 8.9 m/s. What is the waves wavelength?
  99. physics

    Vector A has magnitude 73 units and direction, counterclockwise from east, of 5.5 degrees. What is the value of its x-component to 1 decimal place?
  100. Physics

    As the passenger cars are launched from rest at the start, they are accelerated uniformly to a speed of 57 m's (128 mph) in just 3.5 s.
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