1. A

    Electric Field for the circular path of positively charged particle

    Here is picture. Answers is A. My attempt was that I thought if i were to place a positive test charge then it would go from top to bottom if there was a positive charge in the center it was avoiding and a positively charged particle at the top, but an...
  2. neila9876

    Question about charged circular dish-an old topic

    A circular dish is charged with an iron rod in the center. When the dish rotates, someone on the ground considers that there is current and generates magnetism and the iron rod becomes a magnet; while someone else standing on the dish considers that there is no current and no magnetism generated...
  3. J

    Is uniform circular motion an example of SHM?

    I realise a projection of an object doing UCM appears as SHM, but does UCM object meet the criteria of a type of SHM? Thanks
  4. A

    Circular motion question URGENT

    A skateboarder is trying to take a sharp turn (radius of 2.8m).He grabs a tetherball to help make the turn. As he rounds the curve, the tension in the rope is 75N and the angle the rope makes to the vertical is 28 degrees.If he makes the turn at a maximum velocity of 2.4m/s what is the...
  5. V

    Circular motion

    A body is moving on a circle of radius 80m with a speed of 20m/s which is decreasing at the rate 5 m/sec^2 at an instant. The angle made by its acceleration with its velocity is ? Tangential acceleration = 5 m/s^2 Centripetal acceleration = v^2 / r = 5 Angle btw them alpha = 45 degree...
  6. L

    Unbanked Circular Turn

    A car is safely negotiating an unbanked circular turn at a speed of 26 m/s. The road is dry, and the maximum static frictional force acts on the tires. Suddenly a long wet patch in the road decreases the maximum static frictional force to one-ninth of its dry-road value. If the car is to...
  7. C

    Circular Motion Question.

    A particle of mass m oscillates along arc AB on the inside of a smooth circular hoop of radius 'a' fixed in a vertical. The force on the hoop at any point is : ? (a) k/a (b) k/3a (c) 2k/a (d) 3k/a
  8. P

    Another circular motion question

    Hi, I've got another question. question and diagram - Im doing question 2aiiia I thought that since radial force = mv²/r = 64m N and the transverse force = m*angular acceleration = 0, The magnitude and direction of the force is 64m N towards the centre. However...
  9. P

    Circular motion question

    I'm having trouble with this question and I was wondering if you could help. A light, inelastic string of length 2a is attached to fixed points A and B where A is vertically above B and the distance AB < 2a. A small smooth ring, P, of mass m slides on the string and is moving in a horizontal...
  10. L

    friction in circular conduits

    what does the Rh means here?
  11. J

    Circular motion in two planes problem

    Hi everybody, I have a problem that has got me puzzled as to how to tackle it. The problem reads as follows - A small bead can slide without friction on a circular hoop that is in a vertical plane and has a radius of 0.100m. The hoop rotates at a constant rate of 4.00rev/s about a vertical...
  12. B

    Magnetic field in a Circular conductor vs Flat Conductor

    As we all know that there magnetic field moved in circular direction outside a circular conductor,BUT what will be fields direction if I would take a flat conductor.
  13. L

    intensity of circular waves (affected by ampitude or distance)?

    i was given that ##y=\frac{a}{x}\sin(\omega t -kx)## for displacement , i also know that intensity of waves = P/2∏r (for circular waves) , where power = 0.5m(w^2)(A^2)s^-1 , after substituiting the P inside , i have I = 0.5m(w^2)(A^2)s^-1 /2 pi r. the amplitude is a or a/x ? so i can say...
  14. L

    intensity of circular waves

    when a stone is thrown to position O (in a pond), a wave is generated and the wave eventually spread out form the center, my question is will the amplitude of particle of A, B and C change? the wave intensity is I= 0.5m(w^2)(a^2)s^-1/ 2 pi r so i have i got I is directly propotional to...
  15. L

    radius of circular impulse wave in the hemisphere bowl

    hi all, why the wave is reflected back form the centre when it is at the distance of 200mm? why the wave cant go beyond 200mm to reach 250mm from the side of bowl?
  16. M

    Uniform circular motion problem

    While I was reading a topic I found that when a satellite orbiting the earth at a small radius it moves in a high speed more than a large radius I tried to Know why ?? F = m.a m.g = m.radial accerelation cancel mass g=v^2/r so square velocity is directly proportional to radius which means...
  17. T

    Circular Motion

    Need help with this physics 201 problem. Here is what I have: 1. The experiment done in lab is repeated, using a ball that has unknown mass m. You plot your data in the form of f2 versus M/L, with f in rev/s, M in kg, and L in m. Your data falls close to a straight line that has slope 6.10...
  18. D

    Circular Motion

    A turntable of a radius "r" is spinning counterclockwise at an initial rate of "w". At t=0 its rotation rate begins to slow at a steady pace. The rotation finally stops at t=T. At what time during the time interval 0<t<T was the magnitude of the centripetal acceleration of a point on the...
  19. A

    Circular motion and angle problem

    hello so i got to this circular motion question which is killing me i found part a and b but part c i can't understand how to do... the following picture illustrates the problem and has the problem as well thanks for the help i dont know where to start on part c but i found the velocity of...
  20. E

    A ball lies on the Earth surface, undergoing circular motion together with the Earth.

    Hi: Because of the rotation of the Earth, a plumb bob does not hang exactly in the direction of its weight. If I make a free-body diagram I can see this is the case. Assume the latitude is, say 40 degrees. The tension in the string added to the weight gives a force F lying on the 40 deg...