physics please HELP !

74,851 results, page 71
  1. physics

    If two cars are moving head on toward each other at 88 km/h(55mi/h, and their drivers apply their brakes when they are 85 m apart, will they collide? This is a yes or no answer and explain why
  2. physics

    what is the net force needed to lift a full grocery sack weighing 210N uniformly?
  3. Physics

    A person is jogging at 3.5 m/s and grabs a rope that is hanging vertically from a tree. How high can the student swing?
  4. 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!
  5. Physics

    A ball is thrown vertically into the air with a velocity of 10ms to the negative 1 power. What will its displacement be after 1.5 seconds?
  6. 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?
  7. Physics Help

    Charge Q is uniformly distributed around the perimeter of a semicircle of radius R. What is the electric field at the circle's center?
  8. physics

    At what speed do you approach your image if you walk towards a plane mirror at 1 m/s ? I am not looking for this to be answered for me. I am just looking for how to figure it out. Is there a specific formula to use?
  9. physics

    Charge polarization is normally produced by: nuclear interactions. contact. induction. friction. electrostatic means.
  10. physics

    The path of a projectile fired at a 30 degree angle to the horizontal is best described as 1.parabolic 2.linear 3.circular 4.hyperbolic
  11. physics is this correct

    What is the radius of a real or imaginary nucleus of 46X100 do I use the formula R = R_o * A^(1/3) and therefore (1.3*10^-15)* 100^(1/3) =6.0340655e-15?
  12. science(physics)

    the sum of three forces f1=100n, f2=80n, f3=60n acting on a particle is zero. The angle between f1 and f2 is: Please solve
  13. Physics

    5kg rock is dropped into a well and a splash is heard after 3 seconds , how deep is the well? Ignore air resistance
  14. Physics

    From what height would a car weighing 9990 N have to fall to gain the kinetic energy equivalent to what it would have when traveling 64.87 mi/hr?
  15. physics

    is there a site where i can see if my calculations ofmeasurements or resistors is correct. or where i can see other problems that deal with the tesing or reistors and there results
  16. physics

    I'm trying to find the pressure exerted by an object that has a force of 180 newtons on an area of 10 square centimeters
  17. physics

    express the answer in scientific notation with the correct number of significant figures (8.86+1.0*10^-3) / 3.610*10^-3 2454.57??? please help
  18. physics

    Assistance required as to why visible light is not emitted when infrared radiation falls on fluorescent materials.
  19. physics

    during takeoff, an air plane goes from 0 to 360km/hr in 5s. A.) what is its acceleration? B.) How fast is it going after 5 s? C.) How far has it traveled by the time it reaches 50m/s?
  20. 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 .
  21. Physics

    In terms of Ohms Law (V=IR), when plotting a graph of V against I, is it safe to say that the line passes through the origin, even though 0/0 does not exist?
  22. physics

    what is the t shirts vertical componet of its velocity at launch? if it launches straight at 45° above the horizontal plane at 141 /s?
  23. Physics

    if a machine is capable of accelerating at a constant speed of +20.0m/s^2 calculate the time required for it to go from -5.00m/s to +55m/s
  24. Physics- moles and gas laws

    What is the volume occupied by 8.0 g of hydrogen under a pressure of 2.8 atm and a temperature of 300 K?
  25. physics

    Calculate the half-life of a radioactive substance that decays by a factor of 3 in concentration every 1 million years
  26. 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 .
  27. physics

    the current through a meter movement is 150 micro amperes. what is the dc value if the instrument uses half-wave rectification?
  28. College Physics

    how much work is required to completely separate two charges (each -1.4 microcoulombs) and leave them at rest if they were initially 8 mm apart?
  29. physics

    hummingbird beats wings with frequency of 80.0 Hz. What is period of bird's flaps? I know T = 1/f , but what is the label/units for the answer?
  30. physics

    Two cars both travel at 25km/kr collide into each other, assuming both have same masses. What would happen to the fly which is flying in the mid-way?
  31. Physics

    What would be the path of the Moon if somehow all gravitational forces on it vanished to zero? Please help; need an original answer no Google search. Thank you in advance...
  32. Physics

    State the expression for moment of inertial of the following (1)A rod (2) Rectangular plate (3) ring (4) circular disc
  33. Physics

    State the expression for moment of inertial of the following (1)A rod (2) Rectangular plate (3) ring (4) circular disc
  34. physics

    A group of hikers hears an echo 2.50 s after shouting. If the temperature is 20.0°C, how far away is the mountain that reflected the sound wave?
  35. Physics

    Moment of inertia of a 'non-uniform' ring of mass M and radius R about axis through centre and normal to its plane is
  36. PHYSICS HELP!!

    3.) Draw a free body diagram of a boat being pulled at an accelerated rated by a truck down a highway.
  37. Physics

    State the expression for moment of inertial of the following (1)A rod (2) Rectangular plate (3) ring (4) circular disc
  38. Physics

    A shopper stands 0.6 m in front of a diverging mirror of focal length 0.2 m. Where is the image located and what is the magnification?
  39. physics

    how can i plan and design a lab to investigate how electric current causes contraction of a spiral wire spring
  40. physics

    calculate the acceleration of a 2000-kg single air plane just before takeoff when the thrust of its engine is 500 N
  41. Physics

    An object is dropped from rest. What is its instantaneous speed when it has been in motion for 5 s? The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s
  42. Physics

    What is the power of engine that pulls a 1000 kg automobile at a steady speed of 10 m/sec along a level road?
  43. physics

    A student tries to produce notes of higher frequency by blowing a trumpet harder Discuss whether he will succeed?
  44. physics

    How do you draw a force diagram for an object that is tied to a pole and is moving in a constant circular direction?
  45. physics

    radius of the earth = 6.37 × 10^6 what is the speed of a 90.6 kg person at the equator? I know that F=m(v^2/r) but I don't know the force. Is there another equation that I'm missing or I'm using the wrong one? Thanks
  46. physics

    What is the velocity of a 100 g ball on a 50 cm string moving in a horizontal circle that requires a centripetal force of 1 N?
  47. physics

    In suddenly the value of G, the gravitational constant, increased to a billion times its actual value, what sorts of things would happen?
  48. 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?
  49. physics

    The radius of sphere at therate of 4cm per second .at what ratis its surface area chang when theradius is 6cm
  50. physics

    I have do a project on graphical methods representing vector quantities with 5 examples and graphs. Please let me know where will I get the required info.
  51. Physics

    Two point charges that have charge values of 4.0 X 10^-6 C and -8.0 X 10^-6 C, respectively, are separated by 2.4 X 10^-2 m. What is the mutual force between them, given that kC = 8.99 X 10^9 Nm^2/C^2? I got the Felectric as -5.0 X 10^2 N, but I'm not sure
  52. 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?
  53. question

    is it better to take physics or chemistry if taking both whats better to take 1st in sophomore year better to take ap statistics or precalculas for becoming an architect
  54. physics

    a man weighing 500N runs up a staircase half a minute he rise up by 4m. a.what work did he do? b.what was his power?
  55. Physics

    How does an electric motor work, linking to the theory of electromagnetism? I have already identified a few laws: -Ohms -Faraday's
  56. 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
  57. physics

    What amount of energy is used if 800 C of charge passing through a load with a potential difference of 120 v? answer is 9.6e+4
  58. Physics

    A stone is thrown vertically upward, after't'second it covers a distance of's' metre, where 's'=80t-16t2. It's velocity after 2 second?
  59. Physics

    What is the repulsive electrical force between two protons in a nucleus that are 5 x 10^ -15 m apart from each other? Could you help me with this problem? I can't figure out how to do this. Use Coulomb's equation F= kQQ/r^2
  60. physics

    determine the amount of heat generated per minute by a 120 volt lamp which takes 0.5 amperes. thanks!
  61. physics, science

    What centripetal force is needed to keep a 10 kg object moving at a constant speed of 10 m/s in a circle having a radius of 11 m?
  62. Physics

    What is the change in momentum for a 5,000 kg ship in outer space that experiences no net force over a 1 hr period?
  63. Physics

    How much work is needed to move a -8.00 uC charge from the ground to a point whose potential is +75.0V ? I know -8.00 uc = -0.8 x 10^-6 then I used W = Fd but I can't seems to get right answer any hint is appreciated.
  64. Physics

    State the expression for moment of inertial of the following (1) A rod (2) rectangula plate (3) ring (4)circular disc
  65. Physics

    State the expression for moment of inertial of the following (1) A rod (2) rectangula plate (3) ring (4)circular disc
  66. physics

    Bobpursley; you helped me with my question and I am a little stuck how would I find distance if I don't know time and vice versa?
  67. 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?
  68. physics

    A red flower seen in the light of mercury vapour lamp through a green filter wil appear in what colour?
  69. physics

    The specific heat of pure water at 15 degrees celsius is 4184j/(kg.k). Convert this to kcal/(kg.k). pls help
  70. physics

    a boy travel 5km east and then12 km south.calculate his displacement from starting point.
  71. physics

    At what speed do you approach your image if you walk towards a plane mirror at 1 m/s ? I am not looking for this to be answered for me. I am just looking for how to figure it out. Is there a specific formula to use?
  72. physics

    a waterfall is 122 m in height. calculate the rise in temperature if all potential lost is converted to heat.
  73. Physics

    A block weighing 5.7 N requires a force of 2 N to push it along at constant velocity. What is the coefficient of friction for the surface?
  74. Physics

    What is the power of an engine that pulls a 1000kg automobile at a steady speed of 10m/s along a level road?
  75. Physics

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

    A solid of relative density 1.25 is found to weigh 12g in water find its weight in air
  77. physics

    Find the power delivered to an element at t=3 ms if the current entering its positive terminal is i=5cos60πt A and the voltage is V=3 di/dt
  78. Physics

    How far will a car travel if it starts from rest and experiences an acceleration of magnitude 3.75m/2^2 forward for 5.65 s? Answer is 59.9m
  79. Physics

    How far will a car travel if it starts from rest and experiences an acceleration of magnitude 3.75m/2^2 forward for 5.65 s? Answer is 59.9m
  80. physics

    A motorbike accelerates uniformly at 0.6m.s for 10s. If it covers a distance of 500m. During this time, what was its initial velocity?
  81. physics

    A hollow, thin-shelled ball of mass rolls along a horizontal surface with a translational speed of .
  82. physics

    scientific interpretation of two toy cars having bar magnet on the roof .what happen when close to each other from same and different direction?
  83. physics

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

    A block weighing 5.7 N requires a force of 2 N to push it along at constant velocity. What is the coefficient of friction for the surface?
  85. Physics Dynamics

    An arrow has an initial launch speed of 32 m/s. If it must strike a target 38 m away at the same elevation, what should be the projection angle?
  86. physics

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

    a 4500 kg truck traveling at 17.5 m/s collides with a motionless 1350 kg car. they become locked together. if there is no friction, what is their velocity?
  88. physics

    A copper wire has a diameter of 1.532 mm. What magnitude current flows when the drift velocity is 0.500 mm/s?
  89. Physics

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

    How much force are you exerting on the earth right now? How can a rocket operate in outer space? Describe the process of walking.
  91. physics

    What average force is required to stop an 1100-kg car in 8.0 s if it is traveling at 95 km/h? i got the answer to be 13062.5 N. i don't think that's right...
  92. physics

    a particle moving on a circlehas a velocity of m/s and normal acceleration of 10m/s2.determine the radius of the circle.
  93. 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?
  94. Hurricane Project for Physics Class

    1) Please describe the typical path(s) for hurricanes. Is this part of the pattern of convection?
  95. Physics

    Jill screams and hears her echo 4.4 seconds later. How far from the canyon wall is she if the air temperature is 25 degree C?
  96. Physics

    Jill screams and hears her echo 4.4 seconds later. How far from the canyon wall is she if the air temperature is 25 degree C?
  97. Physics

    What is the acceleration acting on a grandfather clock's pendulum, of length 0.9m, with a maximum angular displacement of 0.1rad?
  98. physics

    A pendulum bob swinging at a velocity of 10 m/sec would rise how high from its lowest point of its swing
  99. Integrated Physics and Chemistry

    Which of the following forms of energy transfer can occur in a vacuum? A) conduction B) convection C) radiation D) all of the above Can I get some help on this one too, please?
  100. 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?