physics please HELP !

74,641 results, page 70

  1. physics

    the substance which allows heat radiations to pass through is.a)iron b)water vapour c)wood d)dry air
  2. physics

    A violin string vibrates at 298 Hz when unfingered. At what frequency will it vibrate if it is fingered one sixth of the way down from the end?
  3. physics

    Calculate the half-life of a radioactive substance that decays by a factor of 3 in concentration every 1 million years
  4. PHYSICS

    A cell phone emits signs in approximately 750 Mhz. Which is the wavelength and energy of this radiation
  5. physics

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

    What minimum speed does a 150 g puck need to make it to the top of a 5.90 m-long, 21.0 degree frictionless ramp?
  7. Physics

    What is the force needed to start a 100 kg block sliding on a horizontal if the coefficients for static and kinetic are 0.75 and 0.5
  8. physics

    if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
  9. physics

    if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
  10. physics

    The distance between the midpoints of two metal balls,P and Q,respectively of masses 55 kg and 70 kg,is 80 cm (a)calculate the gravitational force that P exerts on Q thanks in advance
  11. physics

    An object with a height of 12cm is placed 4cm in front of a concave mirror whose radius of curvature is 16cm.
  12. physics calc based

    In the product F = qB (vectors), take q = 2 (neglecting the units of charge, q) and v = 2.0 i + 4.0 j + 6.0 k and F = 4.0 i + (-20 j) + 12 k . What then is B in unit-vector notation if Bx=By ?
  13. physics

    power applied to a particle varies with times as p=3t^2-2t+1 Watt where t is in second. And the change in its kinetic energy b/w time t=2s t=4s
  14. Physics

    How much time would Simpson save by in- creasing his average velocity to 65.8 km/h to the east? Answer in units of min
  15. Physics

    Describe the path of a moving body whose acceleration is constant in magnitude at all times and is perpendicular to the velocity.
  16. Physics

    Find the component form of ⃗v given a magni- tude of 9 and an angle of θ = 90◦ with positive
  17. physics

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

    What equation illustrates the relationship between the electric field strength and the potential difference? E = d / v E = v / d d = E(v) E = v(d) I'm honestly clueless on this one
  19. physics

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

    for an RLC circuit with a resistance of 11 k*ohm, a capacitance of 2 uF, and an inductance of 24 H, what frequency is needed to minimize the impedance?
  21. Physics

    As a block of wood with the mass of 2.00 kg slides along a floor, it's speed decreases from 4.0 m/s to 1.0 m/s. How much kinetic energy does it lose?
  22. Physics

    How many calories are absorbed by a copper spoon with a mass of 200 grams as it changes from 28°C to 33°C? A) 0.00027 B) 3 C) 90 D) 13,000 And this one. How do i solve this one?
  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?
  24. Physics

    Bob (200kg) and Sally (40kg) want to make a see saw that will balance when they are both on 8it. If the board they have is 5m long, where should the fulcrum be placed?
  25. physics

    the current to an LC circuit is being supplied according to the function I(t)=2*sin(7t). what is the smallest value of t for which the inductor and capacitor each contain half of the energy?
  26. physics

    if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
  27. Physics

    If a pair of carbon atoms were fused, and the product were to emit a beta particle, what element would be produced?
  28. Physics

    A body is thrown up with a velocity of 78.4m/s.find how height will with rise and how much time if it take to return its point of rejection?
  29. physics

    a race car's velocity increases from 4 m/s time interval, its average acceleration would be 10 m/s2 ? true or false ?
  30. Physics

    The distance between Earth and the Moon is 3.84 * 108 m. Show that the round-trip time for the light is 2.56 s Thanks in advance
  31. physics

    Calculate the speed at the edge of a disc of radius 4 cm that rotates at the rate of 8 rev/s. Answer in units of m/s.
  32. Physics

    What is the pressure at a depth of 80 m in the ocean? The density of seawater is 1. 03 × 10 3kg/m3. Please express your answer in units of atm.
  33. Physics

    What is the pressure at a depth of 80 m in the ocean? The density of seawater is 1. 03 × 10 3kg/m3. Please express your answer in units of atm.
  34. 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?
  35. physics help

    how much work must be done to raise a 5kg block of steel from the ground to a height of 2m (in Joules) in the absence of friction?
  36. physics

    A large boulder is ejected vertically upward from a volcano with an initial speed of 41.0 . Air resistance may be ignored.
  37. St. Basil's school. Physics

    The time period of two pendulums are 1.44s and 0.36s respectively. Calculate the ratio of their lengths.
  38. physics

    A bus accelerates at 1.4 m/s2 from rest for 14 s. It then travels at constant speed for 23 s, after which it slows to a stop with an acceleration of magnitude 1.3 m/s2.
  39. physics

    A projectile is fired straight up at a speed of 15 m/s. How long does it take to reach the top of its motion? The acceleration of gravity is 9.8 m/s2 .
  40. physics

    I need to make a holder for a raw egg out of straws so when it is dropped from 8 feet. it will not break I need design ideas.
  41. 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?
  42. physics

    A projectile is fired straight up at a speed of 15 m/s. How long does it take to reach the top of its motion? The acceleration of gravity is 9.8 m/s2 .
  43. physics

    Charge polarization is normally produced by: nuclear interactions. contact. induction. friction. electrostatic means.
  44. Physics

    Given a free falling object that is initially at rest, what are the objects displacement, velocity, and acceleration after 9 seconds?
  45. Physics Help!

    Find the total kinetic energy content of 1.55 moles of an ideal gas at temperature 435 K
  46. Physics

    if the body describes a vertical circle then the minimum velocity at angle theta from lowest position is
  47. physics

    A spring with a force constant of 100 N/m is used to push a 0.27 kg block of wood against a wall, as shown in the figure.
  48. physics

    a 70.o kg student runs up a 5.00 meter high stairway in a time of 5 seconds. how many watts of power did she develop?
  49. Physics

    An automobile is traveling 65mph. Its brakes decelerates at 6.0mps. How long will it takes to stop the car?
  50. physics

    A kangaroo jumps straight up to a vertical height of 1.19m, how long was it in the air before returning on earth
  51. Quantum Physics

    What is the probability current density of a particle with wavefunction ψ(x,t)=exp(iℏ(px−Et))?
  52. physics

    A 50 kg diver leaps off the 20 meter diving board with a velocity of 5 m/s. What is his kinetic energy just before hitting the water?
  53. Physics

    The established value for the speed of light in a vacuum is 299 792 458 m/s. What is the order-of-magnitude of this number?
  54. Physics Help

    What is the energy stored in the inductor shown in the figure after the switch has been closed for a very long time? Take V = 15 V, R = 600 §Ù and L = 10 mH.
  55. PHYSICS

    A 3.1 kg bundle starts up a 30° incline with 139 J of kinetic energy. How far will it slide up the plane if the coefficient of friction is 0.30?
  56. PHYSICS

    'show that a 2.5m length of wire with cross section area 0f 1.0mm and resistance of 0.75ohms has a resistivity o f 3.0 ×10-7'
  57. physics

    Calculate the energy released in the fusion reaction 2 3 4 1 1 H + 1 H->2 H +0 n. The atomic mass of 3 1 H (tritium is 3.016049 u. I am lost! help please!
  58. physics

    the time a male bungee jumps is freely falling is 1.5 seconds. what is the velocity of the jumper at the end
  59. physics

    a race car's velocity increases from 4 m/s to 36 m/s over a 4s time interval, its average acceleration would be 10 m/s2 true or false ?
  60. Physics

    The length of wire is 25.5cm and it's radius is 1.02mm. Calculate the percentage error in mesurement of its volume
  61. 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?
  62. physics

    Calculate the magnitude of the electrostatic force the two down quarks inside a neutron exert on each other if they are separated by a distance of 0.71 fm.
  63. physics

    What is the magnitude of force required to accelerate a car of mass 1.7 × 10³ kilograms by 4.75 meters/secondÆ?
  64. physics

    a vertical object placed on a bench is observed to have three shadows of different sharpness,in different directions.explain tha observation
  65. Physics

    A car accelerates at a constant rate from 13m/s to 25m/s in 6.0seconds. What was its acceleration? How far did it travel in this time?
  66. Physics

    A car accelerates at a constant rate from 13m/s to 25m/s in 6.0seconds. What was its acceleration? How far did it travel in this time?
  67. physics

    How large a force (in newtons) is needed to accelerate a 3 metric-ton vehicle from rest to a speed of 50 km/hr in 4 s?
  68. physics

    An object experiences an impulse, moves and attains a momentum of 100 kg·m/sec. If its mass is 50 kg, what would its velocity be?
  69. physics

    Three blocks are suspended at rest by the system of strings and frictionless pulleys shown in the figure below, where W = 29.0 . What are the weights w1 and w2?
  70. physics

    an object undergoes an acceleration of 10m/s2 starting from rest. find the distance travelled by it in seconds
  71. physics

    Calculate the net charge on a substance consisting of a combination of 8.9 × 10 13 protons and 4.4 × 10 13 electrons. Answer in units of C
  72. physics

    A teacher is shot out of a cannon. He leaves the barrel at an angle of 25.0o to the ground with a velocity of 45.0 m/s. How far down range will he land?
  73. Physics

    If the visible part of an ice berg is 50mx50m in area and 20m is above the surface, what is the height, h? I tried using FB=FG but I don't get anywhere. Can anyone help me out?
  74. Physics

    A period pulse travel a distance at 20m in 1•00sec,if it's frequency is 2•0×10.calculate the wave length
  75. physics

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

    A lamp operates with a current of 0.625A and a potential difference of 120V. What is the currnt flowing through the microwave?
  77. Physics

    According to special relativity, at high speeds the distance between distant locations is: a) shortened b) no different than if you were at rest c) lengthened
  78. Physics

    A bolt requires tightening to a torque of 98 N-m. If a wrench is 28 cm long, what perpendicular force should be applied at its end?
  79. physics

    A 67.5 kg hoop rolls along a horizontal floor so that its center of mass has a speed of 0.090 m/s. How much work must be done to stop it?
  80. Physics

    Find the number of revolutions of a bicycle wheel of diameter 0.7m when the bike goes a distance of 22m down the street.
  81. physics

    if a bus traverses a distance of 10,000 cm with the uniform velocity of 10 m/sec, what is its total time of travel?
  82. Physics

    Can scientists from other countries change what physicists in the United States think? Need help ASAP work due tomorrow XD
  83. Physics

    What is the shortes possible time in which a bacterium could travel a distance of 8.4 cm across a Petri dish at a constant speed of 3.5mm/s?
  84. Physics

    What minimum speed does a 100 g puck need to make it to the top of a 5.9 m-long, 29 degree frictionless ramp?
  85. PHYSICS

    What's the total mechanical energy of a 300kg satellite in circular orbit 1400km above Earth's surface?
  86. Physics

    What is the acceleration of a skateboard down a ramp inclined at 19.5 degrees to the horizontal? 3.271 is the answer. This shouldn't be too tough, but I can't get it. Thanks!
  87. physics

    a particle moving on a circlehas a velocity of m/s and normal acceleration of 10m/s2.determine the radius of the circle.
  88. physics

    okay a race car's velocity increases from 4 m/s to 36 m/s over a 4 s time innterval, its average acceleration would be 10 m/s 2 ? would this question be true ?
  89. physics

    an airplane flying at 150 km/hr encouters a headwind of 30 km/hr. draw a vector diagram of this including the resultant.
  90. physics

    A projectile is fired in such a way that its horizontal range is equal to 8.5 times its maximum height. What is the angle of projection?
  91. college physics

    A delivery truck travels 10 km north, 18 km east, and 29 km south. What is its final displacement (in km) from the origin?
  92. Physics

    Calculate the height through which a crane can lift a load of 4t , when its motor of 4HP operates for 10s. [Take g=10N/kg ]
  93. grade 9 physics

    A runner jogs 12km North then turns and runs 16km East three hours
  94. Physics

    An observer on Earth sees you travel 1000 m at half the speed of light. What distance do you think that you travelled?
  95. physics

    a particuler moves along the sides AB,BC,CD of a square of side 25m with a speed of 15m/s. Its average velocity is?
  96. Physics

    A loudspeaker emits energy equally in all directions at the rate of 1.75J/s. What is the intensity level at a distance of 15 m?
  97. physics

    compute the acceleration of a 1500-N block sliding down a 30 degrees incline. Assume friction is negligible
  98. Physics

    a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight....the angle and normal force
  99. Physics

    a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight....the angle and normal force
  100. Physics

    a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight....the angle and normal force
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