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प्रश्न
| A small pebble tied at one end of a string is placed near the periphery of a circular disc, at the centre of which the other end of the string is tied to a peg. The disc is rotating about an axis passing through its centre. |
- What will be your observation when you are standing outside the disc? Explain.
- What will be your observation when you are standing at the centre of the disc? Explain.
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उत्तर
- On standing outside the disc, we find that the pebble is moving on a circular path.
- On standing at the centre of the disc, we find that the pebble is stationary, placed just in front of us.
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संबंधित प्रश्न
Give an example of motion in which speed remains uniform, but the velocity changes.
A uniform linear motion is unaccelerated, while a uniform circular motion is an accelerated motion.
Answer the following question.
Show that the centripetal force on a particle undergoing uniform circular motion is -mrω2.
A small sphere is attached to a cord and rotates in a vertical circle about a point O. If the average speed of the sphere is increased, the cord is most likely to break at the orientation when the mass is at ____________.
At any instant, the magnitude of the centripetal force on a particle of mass 'm' performing circular motion is given by (ω = angular velocity and v = linear velocity of the particle) ______.
Which of the following is correct about uniform circular motion
- the direction of motion is continuously changed
- the direction of motion is not changed
- speed and direction both remain constant
- speed is constant but the direction is changing
A small bead of mass m can move on a smooth circular wire (radius R) under the action of a force F = `"Km"/"r"^2` directed (r = position of bead r from P and K = constant) towards a point P within the circle at a distance R/2 from the centre. The minimum velocity should be ______ m/s of bead at the point of the wire nearest the centre of force (P) so that bead will complete the circle. (Take `"k"/(3"R")` = 8 unit)
A disc of radius 5 cm rolls on a horizontal surface with linear velocity v = 1`hat"i"` m/s and angular velocity 50 rad/s. Height of particle from ground on rim of disc which has velocity in vertical direction is ______ cm.
Angular speed of hour hand of a clock in degree per second is ______.
By applying Kepler's third law to the formula for centripetal force, Newton concluded that the force acting on a planet is:
