physics please HELP !

74,851 results, page 60
  1. physics

    Explain how an object can orbit a planet & why astronauts float around in the orbiting space shuttle
  2. physics

    What is the magnitude of the displacement of a car that travels half a lap along a circle that has a radius of 170m ?
  3. Physics

    what is the mass of hydrogen peroixide, H2O2, in 350 grams ofa 20% by weight solution?
  4. Physics

    Two spherical objects with a mass of 7.60 kg each are placed at a distance of 2.93 m apart. How many electrons need to leave each object so that the net force between them becomes zero?
  5. Physics

    What is the de Broglie wavelength of an electron that strikes the back of the face of a TV screen at 1/9 the speed of light?
  6. physics

    a cyclist does work at the rate of 500w while riding. how much force does her foot push with, when she is traveling at 8.0 m/s?

    If a DeLorean rolls gently (vo = 0) off a vertical cliff, how long does it take it to reach a downward velocity of 78 km/h?
  8. Physics

    Find the electric potential at the centre of the square of side 1m at the four corners of charges of q1, q2,q3,and q4 are placed having values 3×10^-8C,-3×10^-8C,-5×10^-8C and 6×10^-8C respectively.
  9. physics

    Find the minimum kinetic energy needed for a 3.7×104-kg rocket to escape the Moon.
  10. physics

    what minimum initial velocity must aprojectile have to reach atarget at a distance of 25m away? (g: 10m/s)
  11. physics

    An elevator is moving upward at 0.93 m/s when it experiences an acceleration 0.29 m/s2 downward, over a distance of 0.67 m. What will its final velocity be?
  12. Physics

    A 5 N force directed to the west acts on an object for 2.0 seconds. What is the change in momentum of the oject? Would it be 5 X 2?
  13. physics

    two equal vectors of magnitude 2A are inclime perpendicular to each other find the resultant and direction of vector.
  14. physics

    For an object in equilibrium the sum of the torques acting on it vanishes only if each torque is calculated based on your:
  15. physics

    An elevator is moving upward at 1.00 m/s when it experiences an acceleration 0.28 m/s2 downward, over a distance of 0.74 m. What will its final velocity be?
  16. physics

    What is the frequency of the EM wave emitted most strongly by a glowing element on a stove with temperature 1,500 K
  17. physics

    Rubidium forms the postive Rb+ Is this ion larger or smaller then the neutral atom? Explain PLEASE
  18. 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?
  19. physics

    Find the rms speed of H2O molecules in atmospheric water vapor at a temperature of 13.2° C.
  20. Physics

    What is the maximum circular speed the astronaut can have before he breaks free of gravity and goes drifting off into space?
  21. physics

    My teacher needs us to formulate a question for the science fair. Till now, we have only learned the Kinematics equations, HELP, please....

    A girl rows 10 km downstream in 2 h. Her return trip takes 4 h. How fast can she row in still water. in km/h?
  23. Physics

    why do photoelectrons emitted from a metal surface has energy distribution for an incident radiation of frequency?
  24. Physics

    What is the final velocity of a hoop that rolls without slipping down a 5.00-m-high hill, starting from rest?
  25. Physics

    With what maximum speed can an unsecured passenger stay in their seat on a Ferris wheel that has a diameter of 12 m.
  26. physics

    During a hard sneeze, your eyes might shut for 0.43 s. If you are driving a car at 125 km/h, how far does it move during that time?
  27. Physics - Magnetism

    The direction of magnetic lines of force change if an iron piece is placed in its field. Why?
  28. Physics

    At its peak, a tornado is 60.0 m in diameter and carries 500 km/h winds. What is its angular velocity in revolutions per second?
  29. physics

    How long will it take a 1280 W motor to lift a 345 kg piano to a sixth-story window 19.0 m above?
  30. Physics

    What is the efficiency of a crane that used current of 8A at 150V to raise 450kg load at the rate of every minutes?
  31. Physics

    Calculate the length of a displaced pendulum Bob which pass through its lowest point twice every second. Take g=10m/s²
  32. physics

    Consider the motion of the tip of the minute hand of a clock. In one hour, the displacement and average velocity is .......
  33. physics

    What is the volume of a metal which weighs 28g less in kerosene and the densty is 800 kgm3 than it does in air
  34. physics

    Where must an object be placed to have a magnification of 3.74 in front of a converging lens of focal length 14.1 cm?
  35. physics

    What is the minimum work in joules needed to push a 1540 kg car 44.0 m up a 12.5 degree incline?
  36. Physics

    A 1300 kg sports car accelerates from rest to 85 km/h in 6.2 s. What is the average power delivered by the engine?
  37. Physics

    a 52kg person riding a bike rotates her wheels in a circle of 17 cm what is her max tourque
  38. Physics

    Suppose that you want to take a photograph of yourself as you look at your image in a flat mirror 1.6 away. For what distance should the camera lens be focused?
  39. physics/electrical circuits

    if there are eleven resistors of 33k ohms each in parallel, what is the total resistance?

    AN OBJECT MASS OF 10KG IS PLACED ON AN INCLINED PLANE AT 30 degree at the horizontal calculate recreation between two su
  41. physics

    Earth is approximately a sphere of radius 6.37 × 106 m. What are (a) its circumference, (b) its surface area, and (c) its volume? please help
  42. Physics

    What will a spring scale read for the weight of a 75 kg woman in an elevator that moves upward with acceleration 0.30 g? w=?
  43. physics

    The boats have a mass of 30 kg. The stopping splash lasted about 1.5 s. What acceleration is required to stop the flume?
  44. physics

    a plane travels 5.0 x 10^2 while being accelerated uniformly from rest at the rate of 5.0 m/s. what final velocity does it attain?
  45. Physics

    Calculate the speed of an 7.8×104 kg airliner with a kinetic energy of 1.0 × 109 J. Answer in units of m/s.
  46. physics

    An electric field of 630 V/m is desired between two parallel plates 15.9 mm apart. How large a voltage should be applied?
  47. physics

    A boy sledding down a hill accelerates at 2.00 m/s2. If he started from rest, in what distance would he reach a speed of 5.20 m/s?
  48. AP Physics

    What is the potential energy of an electron and proton in a hydrogen atom if the distance between them is 5.3*10^-11? ANSWER k=9*10^9 Q=1.6*10^-19 q=1.6*10^19 Ue=? Ue=KQq/r Ue=-4.4*10^-18 j
  49. Physics

    What is the formula to find magnetic field at the centre of the solenoid of hollow iron core??

    An airplane accelerates down a runway at 3.20 m/s 2 for 32.8 s until is finally lifts off the ground. Determine the distancetraveled before takeoff.
  51. Physics

    Two identical gliders slide toward each other on an air track. One moves at 2 m/s and the other at 1 m/s. If they stick together, the combination slides at? Why?
  52. Physics

    How much work is required to bring a 1000 kg racing car traveling at a speed of 60 km/hr to rest?
  53. physics

    a 5kg suitcase slides 2m down a frictionless ramp incline at 45 degress. How fast is it going at the bottom?
  54. physics

    the mathematical form of the thin-lens equation predicts that a graph of 1/p vs 1/q should have a slope of -1, explain?
  55. Physics

    What is the time it takes a mosquito to flap its wings once if the frequency of their wing beats is 440Hz?
  56. Physics

    Why is it that interference effects don't show up regularly in glass window panes with two surfaces?
  57. Physics

    Assuming the earth to be a uniform sphere of radius 6400 km and density 5.5g/c.c. find the value of g on the surface where G=6.67×10
  58. physics

    a projectile is fired at an angle of 60 degrees with the horizontal and with the initital velocity of 80 m/s. What is the time of flight?
  59. Physics

    A boy sledding down a hill accelerates at 1.70 m/s2. If he started from rest, in what distance would he reach a speed of 7.40 m/s?
  60. physics

    C1=3.00uF and Vab = 120V. The charge on capacitor C1 is 150 uC. Calculate the voltage across the other two capacitors.
  61. physics

    If wind blows at 44 m/s over a house, what is the net force on the roof if its area is 180 m^2 and is flat?
  62. physics

    A 30.0 kg block falls from a height of 30,4 m. assuming a closed system its speed just before hitting the ground is about?

    Two long, parallel wires separated by 90 each carry currents of 2.0 in a horizontal direction.
  64. physics

    How many times a minute does a boat bob up and down on ocean waves that have a wavelength of 43.0 m and a propagation speed of 5.25 m/s?
  65. Physics

    A boy sledding down a hill accelerates at 1.70 m/s2. If he started from rest, in what distance would he reach a speed of 7.40 m/s?
  66. physics

    How long will it take a 1630 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?
  67. physics

    what is the wavelength of radar waves with the frequency of 6.0*10^10Hz? a. 0.0010m b.0.010m c.0.050m d.0.0050m
  68. Physics

    How much force is needed to hold a nearly weightless but rigid 1-L carton beneath the surface of water?
  69. Physics

    Two protons, an infinite distance apart are brought together to a separation of 1 nm. What is the initial potential energy of the system?
  70. physics-magnetism

    The direction of magnetic lines of force change if an iron piece is placed in its field. Why?
  71. Physics

    In an experiment to explore the nature of the relationships between velocity, force, and acceleration, what important issues are being ignored?
  72. physics

    A stone is projected vertically upward with a speed of 20 m/s. a. What is its velocity at the end of 2s? b. What is the height reacted after 2s?
  73. Physics

    In an experiment to explore the nature of the relationships between velocity, force, and acceleration, what important issues are being ignored?
  74. physics

    How does one go about solving this? A skateboard rider starts from rest and accelerates at a constant +.50 m/s^2 for 8.4s. What is the riders displacement?
  75. Physics

    A 6.25 kg solid ball with a radius of 0.185 m rolls without slipping at 3.55 m/s. What is its total kinetic energy?
  76. physics

    A spring has k = 88 N/m. Use a graph to determine the work needed to stretch it from x = 3.6 cm to x = 5.6 cm, where x is the displacement from its unstretched length.
  77. physics

    A stone of mass m kg is held h metres above the floor 50s.The workdone in joules over this period is
  78. physics

    if a race car's velocity increases from 4 m/s to 36 m/s over a 4 s time interval, its average acceleration would be 10 m/s 2 ? IS THIS TRUE ?
  79. physics

    2)if a curved of radius 50m is banked at 30 degree will a car travelling at 60 km/hr along the curve will safe?
  80. College physics

    You have a collection of six 1.0 kilo ohm resistors. what is the smallest resistance you can make by combining them
  81. physics

    what potential difference delta V is required to accelerate protons from the rest to 10% of the speed of light?
  82. physics

    What is the gravitational force on a 20Kg satellite circling the earth (Re = 6.4 x 10^6 m, Me = 6 x 10^24Kg) with a period of 5hr?
  83. Physics

    explain the concept of electric potential difference in terms of work done in transferring the charge
  84. Physics

    explain the concept of electric potential difference in terms of work done in transferring the charge
  85. Physics

    Two violin players tuning their instruments together hear 8 beats in 2 s. What is the frequency difference between the two violins
  86. physics

    Which phase of matter consists of particles that are locked into place and unable to move past each other?
  87. science (physics)

    thank you for your help! my question is :how do you find the magnitude of the electric field that will balance the weight of an electron?
  88. physics

    "If you have an inductor that has an inductive reactance of 125 ohms, on a 60Hz frequency, what would be the inductance in henry's?"
  89. Physics

    A motor cyclist travelling at 12m/s decelerate at 3m/s(squared)? How far does he travel while coming to rest?
  90. Physics

    A bullet fired vertically upwards reaches a height of 500m. [g=9.8m/s2]. What is its initial velocity?
  91. Physics Please

    You want to show that V^2 - Vo^2 = 2 a (X - Xo) first rewrite that as: (V-Vo)(V+Vo) = 2a (X-Xo) now your average velocity during the interval = (V+Vo)/2 so X = Xo + t(V+Vo)/2 but V = Vo + a t so t = (V-Vo)/a so X = Xo +(V-Vo)(V+Vo)/2a we are there.
  92. Physics

    What is the gravitational force between two 10 kg iron balls separated by a distance of 0.1 m? How does this compare with the weight of one ball?
  93. physics

    the density of a block of wood with a colume of 50 cubic centimeters and a mass of 10o grams is
  94. Physics

    At highway speeds, a particular automobile is capable of an acceleration of about 1.52 m/s2. At this rate, how long does it take to accelerate from 74.0 km/h to 104.0 km/h? (in s)
  95. Physics

    Wat direction will the Electric Field Lines be in a parallel plate capacitor containing a dielectric ?
  96. physics

    when two lenses of focal length +10cm and -5cm are placed in contact then find the net power ?
  97. Physics

    Explain how a drop of water bulging over the edge of a coin demonstrates surface tension.
  98. Physics

    torque to move a block of m=200kg for 10m at an angle of 25 degree with a speed of 20m/s.
  99. Intro to Physics

    With scanning probe microscopy technology, we see not actual atoms but rather images of them. Explain.
  100. physics

    Show that the acceleration is 7.5 m/s2 for a ball that starts from rest and rolls down a ramp and gains a speed of 30 m/s in 4 s