physics please HELP !

74,851 results, page 87
  1. physics

    How much power is used by a 50Kg athlete in climbing a 10m high ladder in 9.8 sec? 1000 J 2000 J 3000 J 4000 J
  2. Physics

    Calculate the vertical distance an object dropped from rest would cover in 12s if it fell freely without air resistance.
  3. Physics

    A plane travels with a uniform velocity of 3.399x10^1 m/s for a period of 2.267x10^0 seconds. What distance is travelled during this time, in meters
  4. Physics

    A 5.0cm tall object is placed 16cm from a convex lens with a focal length of 8.4cm. What are the image height and orientation?
  5. physics

    A 2.0 m wire segment carrying a current of 0.60 A oriented parallel to a uniform magnetic field of 0.50 T experiences a force of what magnitude
  6. Physics

    A triply ionized beryllium atom (Be3+) has only one electron in orbit about the nucleus. What is the radius of the ion when it is in the n = 9 excited state?
  7. physics

    Two stars, a binary star system, with a mass of m1 = 5.88E29 and m2 = 2.27E30 kg are separated by a distance of 2.55E11 m. What is the gravitational force between them?
  8. PHYSICS

    What is the magnitude of the instantaneous velocity (speed) of a freely falling object 13 s after it is released from a position of rest? Consider the acceleration of gravity to be 10 m/s2 .
  9. physics

    A color television has a power rating of 325 W. How much current does this set draw from a potential difference of 120 V? 1 . A i got 2.92 but its wrong?
  10. Physics

    How much work did the movers do (horizontally) pushing a 140-kg crate 10.1 m across a rough floor without acceleration, if the effective coefficient of friction was 0.60?
  11. physics

    A color television has a power rating of 325 W. How much current does this set draw from a potential difference of 120 V? 1 . A i got 2.42 but its wrong?
  12. physics

    The edges of a shoebox are measured to be 11.9 cm, 17.3 cm, and 29 cm. Determine the volume of the box retaining the proper number of significant figures in your answer.
  13. physics

    Q 2) A particle executes simple harmonic motion with an amplitude of 10 cm. At what distance from the mean position are the kinetic and potential energies equal ?
  14. Physics

    A 250kg car initially at rest was travelling with acceleration of 10m/s square. Calculate the kinetic energy after 3 seconds
  15. PHYSICS

    SIMPSON DRIVES HIS CAR WITH AN AVERAGE VELOCITY OF 48.0KM/H TO THE EAST. HOW LONG WILL IT TAKE HIM TO DRIVE 144KM ON A STRAIGHT HIGHWAY?
  16. physics

    Calculate the magnitude of the electric field at one corner of a square 1.48m on a side if the other three corners are occupied by 1.92×10−6 Ccharges.
  17. physics

    In one mole or 18 grams of water, the total negative charge of all the electrons is: a. zero because its electrically neutral. b. less than one C c. almost 100,000 C. d. almost one million C. e. none of these
  18. physics

    Calculate the capacitance of a planet, assuming it is a spherical capacitor of radius R = 9050.0 km with charge distributed throughout the volume of the sphere.
  19. Physics

    If a satellite is orbitting the earth 710km above the earths surface, and it's velocity is 7,406.8 meters/sec, what is it's cetripedal acceleration??
  20. physics

    what is the minimum effort required to raise a load of 5kg in an ideal pulley system taking gravity to be 10m/s/s
  21. Physics

    A projectile is launched at an angle of 6.0 degrees above the horizontal. Which component of the velocity vector remains the same during the flight (neglecting friction).
  22. physics

    You want to design a curve, with a radius of curvature of 35.0 m, so that a car can turn at a velocity of 15 m/s on it without depending on friction. At what angle must the road be banked?
  23. physics

    How far to the nearest tenth of a meter can a runner running at 15 m/s run in the time it takes a rock to fall from rest 76 meters?
  24. Physics

    Calculate the work required to pull a wagon along a horizontal road for 4.0x10^2 m at a constant speed of 3.0 m/s if the force of friction is 8.0 N.
  25. PHYSICS Help please!!

    The two-mile linear accelerator at Stanford University in California "appears" to be less than a meter long to the electrons that travel in it. Explain.
  26. physics

    Calculate the magnitude of the electric field at one corner of a square 1.48m on a side if the other three corners are occupied by 1.92×10−6 Ccharges.
  27. Physics

    How much work did the movers do (horizontally) pushing a 140-kg crate 10.1 m across a rough floor without acceleration, if the effective coefficient of friction was 0.60?
  28. PHYSICS

    How much work did the movers do (horizontally) pushing a 140-kg crate 10.1 m across a rough floor without acceleration, if the effective coefficient of friction was 0.60?
  29. Physics

    Calculate the potential energy of a 40 gram sparrow resting on a branch 30 feet above the ground. (Hint: 1 foot = 0.305 m)
  30. physics

    The brakes on your automobile are capable of creating acceleration of 14 ft/s2. If you are going 66 mi/hr and suddenly see a state trooper, what is the minimum time required to get your car to 55 mi/hr?
  31. Physics

    A cyclist moving on a corcular track of radius 40m completes half a revolution in 40 sec. Its average velocity is nearly
  32. Physics

    A rocket traveling at 165 m/s is accelerated at a rate of -32.0 m/s. a) How long will it take before the instantaneous speed is 0 m/s? It takes 5.156 s. b) How far will it travel during this time?
  33. Physics

    A magnetic field increases from 0 to 0.09 T in 3.0 s. How many turns of wire are needed in a circular coil 20 cm in diameter to produce an induced emf of 7.5 V? Please help soon.
  34. physics

    A stone is moved round a horizontal circle with a 20 cm long string tied to it. if centrepetal acceleration is 9.8 m/s2, then its angular velocity
  35. Physics

    A weight lifter cleans and jerks 150kg, lifting it 2m above the ground in 1.5s. What is his power output? How do you set this problem up i know the units?
  36. physics

    a string of cross section 2 cm^2 is doubled in length by the application of a longitudinal force 2*10^5dynes.the young"s modulus is: 1.10^5 dyne/cm^2
  37. PHYSICS

    IF JOE RIDES SOUTH ON HIS BIKE IN A STRAIGHT LINE FORE 15 MIN WITH AN AVERAGE SPEED OF 12.5KM/H, HOW FAR HAS HE RIDDEN?
  38. Physics

    Two ants race across a table 76 cm long. One travels at 5.2 cm/s and the other at 2 cm/s. When the first one crosses the finish line, how far behind is the second one? Answer in units of cm. Can you teach me how to do this plz?
  39. physics

    a man raises a mass,m to a height ,h and then shifts it horizontally over a distance ,x. find the total work done against the force of gravity?
  40. Physics

    A motorcycle with a mass of 350 kg is accelerated from rest to a velocity of 30 m/s by a force of 4000 N. calculate the distance over which this acceleration occurred.
  41. physics

    a stone propelled from a catapult with a speed of 50mls,attains a height of 100m. Calculate the angle of projection and range.
  42. physics

    A crate of mass m = 230 kg is pushed at constant speed up the frictionless ramp (θ = 29.0°) by a horizontal force F. What is the magnitude of F?
  43. Physics

    The moon is 384,000 km from the earth and makes 1 revolution in 27.3 days. Find its angular and linear speeds in its orbit.
  44. physics

    A large merry-go-round completes one revolution every 10.5 s. Compute the acceleration of a child seated on it, a distance of 5.20 m from its center. what is the magnitude?
  45. explian why please its physics

    expliain y the very high specific heat capacity of water leads to formation of land and sea breezes???
  46. Physics

    A 400 kg rocket sled can be accelerated at a constant rate from rest to 1600 km/h in 2.0 s. What is the magnitude of the required net force?
  47. Physics

    What is the wavelength of a radar signal that has a frequency of 30 GHz? The speed of light is 3 × 10^8 m/s. Answer in units of m Giving me the formula is just fine
  48. Physics

    You are testing a car on the Nevada salt flats traveling 85 m/s. Your parachute deploys and you decelerate at 13 m/s^2. How long does it take to come to a complete stop?
  49. physics

    A basketball player achieves a hang time of 1.07 s in dunking the ball. What vertical height will he attain? The acceleration of gravity is 9.8 m/s2.
  50. physics

    a gun tilted upward at 30 degrees fires a bullet with a speed of 215 m/s. what is the bullets velocity parallel to the ground?
  51. physics

    A basketball is thrown at 45° to the horizontal. The hoop is located 4.5m away horizontally at a height of 1m above the point of release. What is the required initial speed?
  52. physics

    A glacier advances at 4.3 × 10−6 cm/s.How far will it move in 6.4 years? Assume there is 365 days each year. Answer in units of cm. Thanks in advance!!
  53. physics

    a wheel turning with angular speed of 30 rps is brought to rest with constant acceleration. It turns 60 revolutions before it stops.
  54. Physics

    A player kicks a football from ground level with a velocity of magnitude 31.0 m/s at an angle of 30.0 degrees above the horizontal. What is its maximum height?
  55. Physics

    Determine the moment of inertia for three children weighing 64.0 lb, 44.0 lb and 83 lb sitting at different points on the edge of a rotating merry-go-round, which has a radius of 12 ft.
  56. Physics

    A system consisting of two fixed and two movable pulleys has a mechanical advantage of 4.00. If a force of 124 N is exerted, which weight can be raised?
  57. Physics

    A car of mass is 100 kg applies break from 40 km per hours to 0 .it takes 12 seconds .what amount of force is applied for breaks?
  58. physics

    How many calories of heat must be added to 455 g of steel to raise its temperature from 20 °C to 192 °C? (Note: csteel = 0.115 cal./g. °C.)
  59. physics

    A 55.0-kg skydiver free falls for a period of time before opening his parachute. What is his kinetic energy when he reaches a velocity of 16.0 meters/second?
  60. Physics

    How long (in seconds) would it take a sound to travel underwater across the San Francisco Bay at its widest point of 19 000 meters?
  61. physics

    A 55.0-kg skydiver free falls for a period of time before opening his parachute. What is his kinetic energy when he reaches a velocity of 16.0 meters/second?
  62. physics

    A 1.2 lead ball is launched off a cliff top at 16 m/s Determine the balls kinetic energy at position P. Ignore friction
  63. Physics

    Three charges (q1 = 8.7 nC, q2 = -7.2 nC, and q3 = -4.8 nC) are at the corners of a square of side a = 9.2 cm, as shown in the picture. Determine the magnitude of the resultant electric force on each charge.
  64. physics

    Use these magnitudes of the forces of gravity at Earth's surface to determine the masses of the objects on which they act A)0.98N. B)62N C)44.5MN
  65. physics

    At a construction site a pipe wrench struck the ground with a speed of 45 m/s. (a) From what height was it inadvertently dropped? (b) How long was it falling?
  66. physics/electrical circuits

    two identival 3v, 1 ohm batteries are connected in parallel with like polarity to like. the norton equivalent circuit of this combination is?
  67. physics

    Use these magnitudes of the forces of gravity at Earth's surface to determine the masses of the objects on which they act A)0.98N. B)62N C)44.5MN
  68. Physics

    A 3.0 kg block slides down a 4.5 m ramp of angle 30 degrees and collides inelastically with a 4.5 kg bolck at rest. Calculate the velocity after the collision.
  69. physics help

    a gun tilted upward at 30 degrees fires a bullet with a speed of 215 m/s. what is the bullets velocity parallel to the ground
  70. Physics

    I'm confused about this question: "A car traveling at 60 mi/h stops in 6 seconds. How far does it travel during this time?" I can't figure out what formula to use, or how to begin solving this.
  71. physics

    CALCULATE THE ACCELERATION FOR A 10.0 KG BLOCK WHICH IS BEING PULLED UP A 35.0 DEGREE SLOPE BY A FORCE OF 140 N IF THE COEFFICIENT OF SLIDING FRICTION IS 0.100
  72. physics

    rare element very low carbon are composed of symmetrical triangle that have very much, and which are closely linked in the mirror and solid form what can ...
  73. Physics

    A horse canters away from its trainer in a straight line, moving 120 m away in 11.0 s. It then turns abruptly and gallops halfway back in 4.9 s.
  74. Physics

    A 6.5-kg bowling ball thrown with a speed of 5.4 m/s hits a stationary 1.75-kg pin. What is the velocity of each object? Assume that the coefficient of restitution is 0.75.
  75. physics 1

    a helicopter is flying at an altitude of 1000 m above the ground, with a horizontal velocity of 50 m/s, how far from the rally point should the relief package be dropped?
  76. physics

    list any two properties for each of the following case of metals which make them suitable to be used as: (1)utensils for cooking food (2)wires for electrical connection
  77. physics

    If a burning log is a black object with a surface area of 0.35 m2 and a temperature of 800 ¢ªC, how much power does it emit as thermal radiation?
  78. Physics

    A racing car has a mass of 1770 kg. The acceleration of gravity is 9.8 m/s2 . What is its kinetic energy if it has a speed of 133 km/h? Answer in units
  79. physics

    Acceleration in meters per square second. A car begins at rest at a stop sign, it accelerates 25m/s over a time of 8.6sec
  80. Physics

    1) Please describe the structure of a hurricane,and how they work. Include a discussion of how energy is transferred from the warm ocean water up to the sky.
  81. physics

    A ball thrown with a speed of 100m/s,attains a height of 150m (g is 9.8m/s2.Calculate (i) time of flight (ii)angle of projection
  82. physics

    If the coefficient of kinetic friction is 0.25 , how much horizontal force is needed to pull each of the following masses along a rough desk at a constant speed? A) 25 kg
  83. physics

    Two wires run parallel to each other with currents I1 = -60.3 A, and I2 = 44.1 A. If they are a = 0.12 m apart, what is the magnitude of the force (N) per meter of length? I used the formula (f/L)=Uo(I1)(I2)/(2(pi)(r)) I got 4.43810^-2(N/m)but it was
  84. physics

    A proton with a kinetic energy of 5.00E-16 J moves perpendicular to a magnetic field of 0.289 T. What is the radius of its circular path?
  85. physics

    determine the acceleration for a jet taking off on a run way as it starts from rest and reaches a velocity of 50m/s over a period of 10s
  86. Physics

    A ball thrown vertically upward and return in20 seconds.find the velocity and the maximum height with explanation
  87. physics

    In order to clearly read a book 16 cm away, a farsighted girl needs an image to be 36 cm from her eyes. What focal length is needed for the lens in her eyeglasses?
  88. physics

    A particular jet aircraft must reach a speed of 43 m/s in order to take-off. If the acceleration of the plane is 1329 m/s2, the minimum length of the runway is Answermeters
  89. please help with physics

    a gun tilted upward at 30 degrees fires a bullet with a speed of 215 m/s. what is the bullets velocity parallel to the ground
  90. Physics

    A 3,000 kg truck is traveling 28 m/s through a rainstorm. At the end of its journey, it has collected 500 kg of water and is now moving 24 m/s. Was momentum conserved?
  91. Physics 203

    An object is projected upward from the surface of the Earth with an initial speed of 4.6 km/s. Find the maximum height it reaches.
  92. physics

    Show that the critical velocity of body revolving in cercular orbit very close to the surface of a planet of radiuis R and meandencity.
  93. Physics

    What average force is needed to accelerate a 8.00-gram pellet from rest to 135 m/s over a distance of 0.800 m along the barrel of a rifle?
  94. Physics

    A car that was initially at rest reaches a final speed of +50.0 m/s over a displacement of +55.0 m. What is the magnitude of the acceleration? Find the time it took to travel the first 55 m.
  95. physics

    The equation of a SHM of a 600 g object is given as x = 0.45 cos 6.4 t where the displacement x is in meters and time in seconds. What is the total energy of the system?
  96. Physics

    Temperature of a diatomic gas is 300k. If the moment of inertia of its molecules is 8.28*10^-38 gm-cm^2. Calculate their root mean square angular velocity.
  97. physics

    what kind of information is indicted by a graph of the acceleration due to gravity versus ball's mass if the slope of the curve is zero?
  98. physics

    water 20 degrees celsius flows through a 25 mm diameter pipe at a rate of 50 liters per minute. is this laminar or turbulant flow or both?
  99. Physics

    How fast (in rpm) must a centrifuge rotate if a particle 69-cm from the axis of rotation is to experience an acceleration of 200438 g's? (can you show me how you get the answer) be thorough
  100. 11th grade physics

    the horizontal range of a projectile is 4 root 3 times of its maximum height. calculate the angle of projection.