physics please HELP !

74,755 results, page 78
  1. physics

    A car accelerates uniformly from rest to a speed of 24.3 km/h in 5.8 s. Find the distance it travels during this time. Answer in units of m
  2. physics

    A shout down a well produces an echo in 2.00 seconds. How deep is the surface of the water in the well? Assume the speed of sound to be 343 m/s.
  3. physics

    what is reaction product when ethene is treated with steam using phosphoric acid as catalyst at 300 degrees celcious
  4. Physics

    A car starts from rest and accelerates uniformly at 2m/s2 for 10 sec . Find the velocity and displacement at the end of 10 seconds .
  5. physics

    AC power in the United States has 60 cycles per second. What is the period (in seconds) for this current? Round your answer to 3 decimal places.
  6. physics

    A chunk of Martian rock falls off of a cliff and drops 47.7 m in 5.00 s. What is the acceleration due to gravity on the surface of Mars?
  7. Physics

    Find the average velocity over the time interval from 1 to 3 seconds. Express your answer in meters per second to the nearest integer.
  8. Physics

    A 20,000 kg vehicle is running at 80km/hr in a rotonda with a radius of curvature 25m compute for the centripetal force
  9. Physics - Help!

    All, Please just help me in this, I will need you to please give me the clue-thanks. a flashlamp bulb is marked '2.5V,0.30A' and has to be operated from a dry battery of e.m.f 3.0V for the current p.d. of 2.5V to be produced across it. Why?
  10. Physics

    The velocity of a diver just before hitting the water is -8.7 m/s, where the minus sign indicates that her motion is directly downward. What is her displacement during the last 0.98 s of the dive?
  11. physics

    A stretched string of length 168 cm vibrates in its nth mode. The separation distance from node to antinode is 21 cm . What is the value of n?
  12. physics

    calculate the force exerted on a rocket given that the propelling gases are expelled at a rate of 1000 kg/s with a speed of 60,000 m/s.
  13. Physics

    An electric filament can heat 200 cm^3 of water from 5°C to 95°C in 6 minutes. If the voltage source is a 12 V battery, how much current does it draw?
  14. physics

    A 70 ohm resistor is connected to a 6.7 V battery in the circuit below.When the switch is closed, calculate the current I. Answer in units of A.
  15. physics

    A Corvette, initially traveling at a speed of 6 m/s, speeds up (accelerates) at a rate of 0.2 m/s2 for 3 s. How far does it travel during that time? I tried d=vi*t-.2*t^2 but I did not get the correct answer

    What is the magnitude of the electric field between two large parallel plates 2.0cm apart if a potential difference of 450 V is maintained between them?
  17. Physics

    Which of the following is an example of a baryon? a. meson b. electron c. lepton d. proton and neutron I saw a sight online that said A but on the notes my teacher had us copy it says D. It is d.
  18. physics

    A compact car can achieve a maximum acceleration of 3.2 m/s^2. If dice were hanging from the rearview mirror, what angle would they swing on?

  20. Physics

    Find the minimum initial speed of a projectile in order for it to reach a height of 2022 km above the surface of the earth.
  21. Physics

    I have a rubber ball. Its diameter is 5.16 cm. Its density is 1.5 Mg/m^3. I need to find its weight in US units. I know to use w=pVg I am coming out with the wrong answer though. Can someone help?
  22. physics

    Two inelastic balls of masses 2 and 3 kg are moving at the velocities 8 and 4 m/s. Find the increase of the internal energy if the first ball catches up the second one.
  23. Physics

    A car weighing 1000kg is going up an incline with a slope of 2 in 25 at a steady speed of 18kmph.If g=10m/s2, the power of its engine is
  24. Physics

    A bullet fired target loses half of it velocity in penetrating 15cm .how much further it will penetrate before coming to rest
  25. physics

    Who developed modern periodic table? Descibe particle arrangements & movement for each phase of matter. (Thank you for helping me)
  26. physics

    The velocity of a diver just before hitting the water is -8.8 m/s, where the minus sign indicates that her motion is directly downward. What is her displacement during the last 0.93 s of the dive?
  27. physics

    The velocity of a diver just before hitting the water is -8.8 m/s, where the minus sign indicates that her motion is directly downward. What is her displacement during the last 0.93 s of the dive?
  28. Physics

    If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about ? When I use the quadratic formula, I get -8.97
  29. physics - forces

    Calculate the velocity of a satellite moving in a stable circular orbit about the Earth at a height of 2600 km.
  30. Physics

    Find the frequency of a sound wave moving in air at room temperature (20.0) with a wavelength of 0.667 m. Is the formula F=1/T?
  31. Physics

    An airplane lands and starts down the runway at a southwest velocity of 43 m/s. What constant acceleration allows it to come to a stop in 1.2 km?Answer is in ___ m/s2.
  32. physics

    Determine the x and y components of the following three vectors in the xy plane. 1) A 19-m/s velocity vector that makes an angle of 40° counterclockwise from the -x direction. x: 2) y: Explain please!
  33. physics

    A duck waddles 2.3m east and 7.0m north. what are the magnitude and direction of the ducks displacement with respect to its original position?
  34. Physics

    It is easy to see a drop of water on the print of a glossy magazine but it is difficult to see it on the white area of the same page. Explain why.
  35. Physics

    A soccer player kicks a rock with an initial velocity of 0.50 m/s from a height of 4.0 meters. What is the speed of the ball 0.70 second after it is released? Vi = 0.50 m;s h = 4 m t = 0.70 s
  36. physics

    A vector points 34.8 degrees to the Northeast with magnitude 15. What are the north and east components that make up the remainder of the triangle?
  37. physics

    in a shuffleboard game, the puck slides a total of 12 m before coming to rest. if the coefficient of friction is 0.21, what was the initial speed?
  38. 11 physics

    a20Kg box is suspended from the ceiling by arope that weighs 1Kg . find the tension at the top of the rope.
  39. physics

    Assume that here in sussex we live at exactly latitude 45 degress. Calculate the tangential speed, in m/sec and in mph that we are rotating at
  40. Physics

    Three particles have charges +20μC each.They are fixed at the corners of an equilateral triangle of side 0.5m .The force on each of particle has magnitude
  41. physics

    Stand on a 200 meter high building and, at noon, drop a ball. At what time does it hit the ground
  42. physics

    If two stones projected from the same point with the same speed but at angles pi/3 and pi/6 respectively have their ranges R₁ and R₂ then a)R1=2R2 B)R1=R2 C)R1=5R2 D)R1=25R2
  43. physics

    Calculate the acceleration of a ball that starts from rest, rolls down a ramp, and gains a speed of 24m/sm/s in 5.8 seconds.
  44. physics

    a box of treasure with a mass of 92 kg and volume of 0.031metrecubic lies at the bottom of the much force is needed to lift it?
  45. Physics

    A block of mass 0.585 kg is placed on the end of a spring which has a stiffness of 294 N/m. It is pulled down 2.80 cm and released. What is the frequency of oscillation?
  46. physics

    If You do 100 j of work to elevate a bucket of water,what is its gravitational potential energy relative to its starting position?
  47. physics

    An object is located 27.6 cm to the left of a converging lens whose focal length is 46.5 cm. (a) Determine the image distance and (b) the magnification.
  48. Physics

    A pulley system has a velocity ratio of 4 and an efficiency of 80%.calculate the value of the effort required to raise the load of 480N
  49. physics

    What is the initial height big an object if, when dropped from rest , its kinetic energy is 21J 2/3 of the way towards the ground? The mass is 5
  50. physics

    Peter Pan is suspended in space. He throws an entire jar of pixie dust to his left. Which way does he move?
  51. physics

    explain the scientific method for dropping a penny from the empire state building to see if it will penetrate someones head below
  52. physics

    The pulley in Figure P8.59 has a moment of inertia of 7.0 kg·m2 and a radius of 0.50 m. The cord supporting the masses m1 and m2 does not slip, and the axle is frictionless.

  54. Physics help!

    The range of human hearing extends from approximately 20 Hz to 20,000 Hz. Find the wavelengths of these extremes at a temperature of 2°C. 20 Hz? 20000 Hz?
  55. physics

    Which of the following situations represents a negative displacement? (Assume positive position is measured vertically upward along a y-axis.)
  56. physics

    A skateboarder, with an initial speed of 4.2m/s , rolls virtually friction free down a straight incline of length 16m in 3.3 s.
  57. physics

    Write a multiple-choice question that requires the reader to apply conservation of momentum to a system of two objects.
  58. Maths, physics, chemistry,

    The weight of H2C2O4.2H2O required to prepare 500 ml of 0.2N solution is a)126g b)12.6g c)63g d)6.3g
  59. Physics

    Sunlight strikes a fused quartz surface. At what angle of incidence is the reflected light completely polarized?
  60. physics

    Jessica stretches her arms out 0.6 m from the center of her body while holding a 2 kg mass in each hand. She then spins around on an ice rink at 1.1 m/s.
  61. physics

    If the average time from one on state to the next one on the first photogate is 0.005 seconds, what is the speed of the cart at this point (LEAVE OUT the units of m/s)?
  62. physics

    A 60kg boy is riding his bike to school. His acceleration is 15 m/sec^2. Determine the magnitude of the force he is exerting.
  63. physics

    A circus motorcylist can ride his motorcyle through a loop with a radius of 15 meters. What is the minimum velocity with which he can accomplist this feat?
  64. Physics: Waves in Media

    By how many decibels does the sound intensity from a point source decrease if you increase the distance to it by a factor 6?
  65. physics

    The work done by non-conservative forces is equal to the total change in kinetic and potential energy. True or False?
  66. physics

    need help with tthe first question on this page!!! please
  67. Physics

    Find the electric field at P in the figure shown below. (Take r = 1.5 m and θ = 41°. Measure the angle counterclockwise from the positive x-axis.)
  68. Physics

    The work done in rubbing your hands together s equivalent to the amoun of heat produced. What principle does this demonstrate? I am not sure, is it kinetic energy?
  69. Physics

    How much work did the movers do horizontally pushing a 160-kg crate 10.3m across a rough floor without acceleration, if the coefficient of friction was 0.50?
  70. physics

    32 kg child practicing rock climbing, she feel but the rope hung on with a tension of 253N. find acceleration??
  71. Physics

    Which object has a greater momentum, a stationary tractor-trailer or a tossed tennis ball? Explain your answer please.
  72. Physics

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

    What is the direction (vertical or horizontal) of the transmission axis of Polaroid sunglasses? Give the physical reason for your answer.
  74. Physics

    When you swim across a river does the time it takes to get to the other side depend on the rate of flow of the water? Defend your answer.
  75. physics - magnetism

    A positive and a negative particles enter magnetic field at the same angle and with the same velocity. How different would be the path of each particle?
  76. Physics

    How long will it take a charged 80-ìF capacitor to lose 20 percent of its initial energy when it is allowed to discharge through a 45 ohm resistor?
  77. physics science

    Please can you help as I am stuck, Describe ib detail, how you would carry out an investigation to measure the density of a block of aluminium? Thankyou
  78. physics

    A vector representing 170 N is oriented at 30 degrees with the horizontal. What is the magnitude of the vertical component? Answer in units of N,
  79. physics

    With what frequency would you have to push a child on a swing that had supporting chains that were 2.3 m long? Express your answer in Hz to 3 significant digits.

    What is the acceleration (in meters/second^2) of a freely falling 73.0 kg sky-diver, if air resistance exerts a force of 273 N?
  81. physics science

    Please can you help as I am stuck, Describe ib detail, how you would carry out an investigation to measure the density of a block of aluminium? Thankyou
  82. physics

    how long will it take a 1750-watts motor to a lift a 285-kg piano to a sixth storey window 1.6 meters above
  83. physics

    Leroy, who has a mass of 90 , is skateboarding at 8.6 when he smacks into a brick wall and comes to a dead stop in 0.2 .find the force of impact
  84. physics

    A ball is thrown straight up with an initial speed of 60 m/s. How high does it go? Assume the accelera- tion of gravity is 10 m/s22
  85. physics

    At high speeds, a particular automobile is capable of an acceleration of about 0.510 m/s^2. At this rate, how long (in seconds) does it take to accelerate from 95.0 km/hr to 101 km/hr?
  86. physics

    Hi, We have taken the Poiseuille's Equation yesterday, and I need some simple exercises about it to be familiar with it, because it is hard to memories . Please if you know any useful website tell me or give me its URL. Thank you.
  87. Physics

    A golf ball is struck with a five iron on level ground. It lands 85.0 m away 4.60 s later. What was the magnitude and direction of the initial velocity
  88. Physics

    Ivan rides his motorcycle 4.5 times around a circular track that has a radius of 100 m a)what is the distance traveled and b)what is the displacement?
  89. Physics

    Find the amount of heat required to convert 10g of ice to steam at 110 degree Celsius.

    What is the direction (vertical or horizontal) of the transmission axis of Polaroid sunglasses? Give the physical reason for your answer.
  91. Physics

    Force acting on conductor when placed in magnetic field from east to west horizontal component is 3.0 and current is 10A
  92. physics

    How do you measure a unidentified capacitor when you have a identified one as well as voltmeter, a ammeter, a resistor and a light bulb as well as 3 1,5 batterycells. You have a conductinhcords?
  93. Physics

    If you are at the top of a toboggan run that is 44.3 m high, how fast will you be going at the bottom, provided you can ignore friction between the sled and the track?
  94. Physics

    A steel wire, 150 m long at 10°C, has a coefficient of linear expansion of 11 ´ 10-6/C°. Give its change in length as the temperature changes from 10°C to 45°C.
  95. physics

    Calculate the average velocity for a remote controlled vehicle that starts with a speed of 1.0 m/s [forward] and then accelerates at 0.08 m/s2 [backward] for 4.0 s.
  96. Physics

    A bomber is flying at a velocity of 200.0 km/hr with an altitude of 1.5 km. How far (horizontally) from its intended target should the plane drop the bomb?
  97. Physics??

    A car is traveling at a speed of 62 on a freeway. If its tires have diameter 24.0 and are rolling without sliding or slipping, what is their angular velocity?
  98. Physics

    A 3kg block is resting on a table with a coefficient of friction of 0.4. It is now pushed with a force of 15n. What is the acceleration of the book?
  99. Physics

    A man holds a child on his shoulder while watching a football much work is done if the game lasts for 2hours
  100. physics

    draw a particle model and a motion diagram for A bike travels at constant speed of 4.0 m/s for 4 s then slow down to come at rest in 3 s.