physics please HELP !

74,851 results, page 94
  1. Physics

    A monochromatic wavelength 600nm passed through a singlde slit which has a width of 0.8mm. A,calculate the distance between six and nineth bright frings.
  2. physics

    An engine provides a 10kw of power to lift a heavy load at a constant velocity a distance 20m in 5s. what is the mass of the object being lifted?
  3. Physics!

    Suppose that you are standing on a train accelerating at 0.39g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?
  4. Physics please help!

    Suppose you wish to make a solenoid whose self-inductance is 1.2 mH. The inductor is to have a cross-sectional area of 1.2 10-3 m2 and a length of 0.048 m. How many turns of wire are needed?
  5. physics

    A referee tosses a coin straight up with a velocity of 5.25 m/s, how high does it go above its point of release? (Hint: How fast is it moving at the maximum height?)
  6. physics

    an elevator lifts 4 person each with an average mass of 72 kg to a height of of 20 metre in one minute calculate 1 the work done by the lift and 2 the power exerted
  7. Physics

    A train moving with constant speed of 54kmph moves eastwards for 30min then north for 40min find avg velocity
  8. physics

    It continues to fly along the same horizontal arc but increases its speed at the rate of 1.41 m/s.Find the magnitude of acceleration under these new conditions. Answer in units of m/s
  9. physics

    A train is moving with an initial velocity of 30 m/s the breaks are applied so as to produce uniform acceleration of minus 1.5m/s Calculate the time in which it will come to rest
  10. Physics

    A novice skier, starting from rest, slides down a frictionless 24.0 incline whose vertical height is 215. How fast is she going when she reaches the bottom?
  11. physics

    a diver dives from the top of a 100m cliff. he begins his dive by jumping up with a velocity of 5m/s how long does it takes for him to hit the water below?
  12. Physics/English/Nautical Mile

    In my previous posts about the NM I think part of my problem is I do not understand the meaning of the word "SUBTENDED". Explanation please. Mike
  13. Physics

    Rotating initially at 1800 rpm, a wheel with a diameter of 74.0 cm is brought to rest in 11.0 s. Calculate the magnitude of its angular acceleration in radians/second^2
  14. Physics

    Suppose you wish to make a solenoid whose self-inductance is 1.2 mH. The inductor is to have a cross-sectional area of 1.2 10-3 m2 and a length of 0.048 m. How many turns of wire are needed?
  15. physics

    Determine the minimum size of a mirror that a lady 1.2m tall will buy to be able to see her full height if her eyes are placed 6cm from the top of her head
  16. Physics

    A 0.55 kg block slides across a tabletop with initial velocity of 3 m/s and it comes to rest in a distance of 0.53 m. Find the average friction force that retarded its motion.
  17. Physics

    A high efficiency natural gas furnace is 92% efficient. How many joules of output energy will 750kJ of input fuel provide? Please help! Thank you.
  18. physics

    a long jumper takes off at an angle of 20 degrees with the horizontal and reaches a maximum height of 0.55 meters at mid- flight. how far did she jump?
  19. Physics

    If a person weighs 500 N on Earth, what would she weigh on Jupiter, where the acceleration due to gravity is 26 m/s2? Show all work leading to your answer.
  20. Physics

    A 0.250-kg block of a pure material is heated from 20.0°C to 65.0°C by the addition of 4.35 kJ of energy. Calculate its specific heat and identify the substance of which it is most likely composed.
  21. physics

    Research on the scientific principle involved in the inflation of an airbag. Explain how this device protects the driver and the front passenger from injuries.
  22. physics (fluids)

    If a object of radius 3 cm is attached to the ground in a 3 m deep sea, what is the vertical force in N with which the water (density = 1000 kg/m^3) presses on it?
  23. physics

    a train is moving at 30m/s when the brakes are applied the retardation is 2m/s (square). find the velocity after 10sec and the time taken for the tree to come to rest
  24. Physics

    A 17 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 1.5 m/s. How much thermal energy due to friction was generated in this process?
  25. Physics

    A ball having a weight of 1.5 N is dropped from a height of 4 meters. (Neglect air friction.) How much mechanical energy is "lost" just before it hits the ground?
  26. physics

    A Martian rover is moving up a hill sloped at 30.0° with the horizontal. If it has a constant velocity of 1.50 meters/second, calculate its vertical displacement after 21.0 seconds
  27. physics

    Two railroad cars, each of mass 6500kg and traveling 95km/h, collide head-on and come to rest. How much thermal energy is produced in this collision?
  28. Physics to Elena

    Ex=0 ; Ez=0 Ey = 10   sin(3.14x - 6.08e8 t) what is the time-averaged Poynting vector (magnitude and direction) for the position x=y=z=−3 ?
  29. physics

    With an average acceleration of −0.96 m/s2, how long will it take a cyclist to bring a bicycle with an initial speed of 14.8 m/s to a complete stop? Answer in units of s
  30. physics

    Spaceman Spiff's space box wights 60N. its engine exerts a +312N of force at lift-off. what is the acceleration when it lifts off
  31. College Physics

    Construct & solve a problem involving a person swimming across a river which has a waterfall some distance downstream. Please help, I have no idea where to start.
  32. physics

    a body is dropped from the roof of a builindgs 10 m high .calculate the time of fall and the speed with which it hits the ground .take g=10m/second sqare
  33. physics

    a body is dropped from the roof of a builindgs 10 m high .calculate the time of fall and the speed with which it hits the ground .take g=10m/second sqare
  34. Physics

    An Olympic long jumper is capable of jumping 8.44m. Assuming his horizontal speed is 5.644m/s as he leaves the ground, how high does he go?
  35. physics

    If a loaded truck that can accelerate at 1 m/s2 loses its load and has four-fifths of its original mass, what acceleration can it attain if the same driving force acts on it?
  36. physics

    An old-fashioned single-play vinyl record rotates on a turntable at 34.0rpm . What are the angular velocity in rad/s and the period of the motion?
  37. Physics

    A baseball is thrown at an angle of 20◦ relative to the ground at a speed of 25.8 m/s. The ball is caught 43.6152 m from the thrower. The acceleration due to gravity is 9.81 m/s2 .
  38. physics

    Bob heads out into a lake at an angle of 30 with respect to the shore. If his boat is capable of a speed of 3.3 m/s, how far from land will he be in 9 min and 46 s ? Answer in units of m
  39. Physics

    An outfielder throws a 0.150 kg baseball at a speed of 26.0 m/s and an initial angle of 30.0°. What is the kinetic energy of the ball at the highest point of its motion?
  40. physics

    four resistor of resistances 1ohm,2ohm,3ohm,5ohm, are connected in series and afterwards in parallel.calculate the combined resistance in each case
  41. physics

    If a freely falling rock were equipped with a speedometer, by how much would its speed readings increase with each second IF it were on a planet where g = 20 m/s2? Show all work leading to your answer.
  42. physics

    Research on the scientific principle involved in the inflation of an airbag. Explain how this device protects the driver and the front passenger from injuries.
  43. physics

    (a) What linear speed must an Earth satellite have to be in a circular orbit at an altitude of 153 km? m/s (b) What is the period of revolution? min Read the eBook
  44. physics

    What is the critical angle of light traveling from benzene (n=1.501) into air? Choose one answer. a. 40.05o b. 48.22o c. 41.78o d. 62.63o
  45. physics

    What change in kinetic energy does an airplane experience on takeoff if it is moved a distance of 600 m by a sustained net force of 5400 N?
  46. physics 180

    a gazelle attempts to leap a 1.8 meter fence. assuming a 45 degree takeoff angle, what's the minimum speed for the jump?
  47. physics

    which of the following properties of a sound wave determines its pitch: wavelength, speed, amplitude, or frequency? Plese show work, Thank you, Silly
  48. physics

    What is the critical angle of light traveling from benzene (n=1.501) into air? Choose one answer. a. 40.05o b. 48.22o c. 41.78o d. 62.63o
  49. physics help

    A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is? when i work this out with the formula that you gave me, i get 2525 instead of 2000 N
  50. Physics

    Simpson drives his car with an average velocity of 45.1 km/h to the east. How long will it take him to drive 153 km on a straight highway? Answer in units of h
  51. Physics

    By what amount will a 178 m long concrete slab on the Mackinac Bridge contract when going from +39C to -35C? The linear expansion coefficient is 10-5 per C.
  52. Physics

    use the face that the speed of light in a vacuum is about 3.00 x10^8 m/s to determine how many kilometers a pulse from a laser beam travels in exactly eighteen hours
  53. general physics

    What is the smallest number of whole logs (ñ = 725 kg/m3, radius = 0.0556 m, length = 3.80 m) that can be used to build a raft that will carry four people, each of whom has a mass of 73.0 kg?
  54. physics

    A 31.4-kg diver free falls from the diving board and hits the water with a speed of 10.0 m/s. Based on this information, the height of the tower is __________
  55. Physics

    What is the kinetic and potential energy of a Boeing 747 airliner weighing 2.48 106 N, flying at 268 m/s (i.e., 600 mi/h) at an altitude of 6.2 km (i.e., 20 103 ft)?
  56. Physics

    If a rocket is launched at an initial speed of 120m/s at an angle of 25 degrees, find the time of flight, range, and it's highest height.
  57. Physics - studying for finals

    (a) Write the expression for y as a function of x and t in SI units for a sinusoidal wave traveling along a rope in the negative x direction with the following characteristics: A = 5.00 cm, λ = 75.0 cm, f = 5.00 Hz, and y(0, t) = 0 at t = 0. (Use the
  58. Physics

    During a football game, A is 8.0 m behind B and is running at 7.0 m/s when B catches the ball and starts to accelerate away at 2.8 m/s(squared) from rest. a) Will A catch B? If so, after how long? b) How far down the field will B have run?
  59. physics

    an object of mass 2 kg attached to wire length 5 cm is revolved in a horizontal circle if it makes 60rpm find angular speed
  60. Physics

    Suppose that you are standing on a train accelerating at 0.33g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?
  61. Physics

    A bullet is fired straight up from a gun with a muzzle velocity of 148 m/s. Neglecting air resistance, what will be its displacement after 6.3 s? The acceleration of gravity is 9.8 m/s2 .
  62. physics

    Driving home from school one day, you spot a ball rolling out into the street (see the figure ). You brake for 1.40 , slowing your 950- car from 16.0 to 9.50 .
  63. physics

    An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?
  64. physics

    A stone is thrown downward into a well with an initial speed of 5.00 m/s. The sound of splash is heard 1.50 s later. Find the depth of the well if the air temperature is 15.0 ˚C?
  65. Integrated Physics and Chemistry

    Some refrigerants used in air conditioners have been associated with.. A)somg B)destruction of the ozone layer C)thermal pollution D)power failures
  66. Honors Physics

    Give some examples of applications that resulted from work done by physicists. The answers I have are: computers, electricity, cars, and television. Are these acceptable?
  67. Physics

    Use the work-energy theorem to solve each of these problems. You can use Newton's laws to check your answers. Neglect air resistance in all cases.
  68. Honors Physics

    Give some examples of applications that resulted from work done by physicists. The answers I have are: computers, electricity, cars, and television. Are these acceptable?
  69. Physics or Science?

    Why liquid soap dispensed through a small spout by pressing on it, solidifies interfering with its smooth ejection? thanks so much for an answer! Pietra
  70. Physics

    A bullet moving with a speed 150 m/s strikes a tree and penetrates 3.5 cm before stopping. Find the magnitude of its acceleration and the time taken to stop.
  71. physics

    A rocket moves upward, starting from rest with an acceleration of 32.0 m/s2 for 3.27 s. It runs out of fuel at the end of the 3.27 s but does not stop. How high does it rise above the ground?
  72. physics

    A football player is running at a speed of 9m/s hits the goalpost and comes to a stop in 0.050 sec. Calculate his acceleration and compare it with that of gravity.
  73. Physics

    What is the difference in blood pressure (mm−Hg) between the top of the head and bottom of the feet of a 1.88m tall person standing vertically?
  74. physics

    An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?
  75. physics

    An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?
  76. physics

    A 58 kg skier has a speed of 9.5 m/s at point A. She then encounters a 1.75 m deep dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m.
  77. Physics

    A 120-V rms voltage at 1000 Hz is applied to a resistor and an inductor in series. If the impedance of this circuit is 110 Ù, what is the maximum value of the current?
  78. physics (urgent)

    A flywheel with a moment of inertia of 1.00kg m^2 is rotating at 100 rpm. What torque is required to bring it to rest in 10.0 revolutions?
  79. Physics

    A girl weighing 310 N sits on a hammock supprted by two ropes. Each tied 60 degree from vertical posts. What is the tension on each rope?
  80. Physics

    Suppose that you are standing on a train accelerating at 0.33g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?
  81. physics

    A diver jumps off a diving board with a speed of 25m/s he returns to the water after 3s. At the top of his dive describe his velocity and his acceleration?
  82. physics

    a mass of 0.1kg falls freely under the action of gravity .find the force acting on it its momentum kinetic energy after 10s?
  83. physics

    a car accelerates uniformly from rest to a speed of 21.8 km/h in 5.9 seconds.find the distance it travels during this time. answer in units of meters
  84. physics

    Qualitatively explain how you would expect the kinetic energy to change as a glider slides down an inclined air track, where friction is negligible.
  85. physics

    Qualitatively explain how you would expect the potential energy to change as a glider slides down an inclined air track, where friction is negligible.
  86. physics

    What will be the equilibrium temperature when a 245g block of copper at 285 degrees C is placed in a 145g calorimeter aluminum cup containing 825g of water at 12 C ?
  87. Integrated Physics and Chemistry

    Some refrigerants used in air conditioners have been associated with... A)smog B)destruction of the ozone layer C)thermal pollution D)power failures
  88. physics project

    how to develop a Rube Goldberg machine that will (1) raising a flag on a pole and (2) squeeze a minimum of a 1 cm length of toothpaste on a toothbrush.
  89. physics

    A sphere is fired downwards into a medium with an initial speed of 40 . Part A If it experiences a deceleration of , where is in seconds, determine the distance traveled before it stops.
  90. physics

    A window air conditioner consumes 900 W of electric power and has COP = 2.9.If it runs continuously for 24 h , how much heat gets removed from the house?
  91. Physics

    A Martian rover is moving up a hill sloped at 30.0° with the horizontal. If it has a constant velocity of 1.50 meters/second, calculate its vertical displacement after 21.0 seconds.
  92. Physics

    An old-fashioned single-play vinyl record rotates on a turntable at 40.0 rpm. What are (a) the angular velocity in rad/s and (b) the period of the motion?
  93. physics

    Determine the frequency and period for a pendulum of length 250cm, mass of 500g, and amplitude of 25cm I don't understand how to do this, help would be appreciated! Thank you
  94. physics

    when starting a foot race a 66 kg sprinter exerts an average force of 640 N backward on the ground for 0.85s. What is his final speed in m/s?
  95. Physics

    How does the cochlea sense sound? •Snail shaped tube lined with receptor cells which transmits signals to the brain. Correct?
  96. physics

    how do we find the interpolation from a graph to determin the number of images which should be observer with a mirror angle of 90 degree and how do we calculate the line equation.
  97. Physics

    What is the greatest safe speed, without skidding, that a 1700 kg car can have on a level curve of radius 215 meters if Mk=0.4 and Ms=.85? Answer=42.3 I tried using the equation mv^2/r=mg+Mk.
  98. physics

    If a Saturn V rocket with an Apollo spacecraft attached has a combined mass of 2.6 105 kg and reached a speed of 11.2 km/s, how much kinetic energy would it then have? __________J
  99. physics

    Two equals negatives charges (-1.75x10^(-19) Coulb) are separated by an insulator at a distance of 0.230 mm. Find the electrostatic force between these electrons?
  100. Physics

    An oscillator with a mass of 520 g and a period of1.2 s has an amplitude that decreases by 2.20% during each complete oscillation. At what time will the energy be reduced to 15.0% of its initial value?