मराठी

Earth moves around the sun with uniform velocity. - Physics

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प्रश्न

Earth moves around the sun with uniform velocity.

पर्याय

  • True

  • False

MCQ
चूक किंवा बरोबर

उत्तर

This statement is false.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 1: Motion - Very Short Answers 2 [पृष्ठ ३९]

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लखमीर सिंह Physics (Science) [English] Class 9 ICSE
पाठ 1 Motion
Very Short Answers 2 | Q 2 | पृष्ठ ३९

संबंधित प्रश्‍न

In U. C. M (Uniform Circular Motion), prove the relation `vec v = vec w xx vec r`, where symbols have their usual meanings.

 
 

Draw a neat labelled diagram of conical pendulum. State the expression for its periodic time in terms of length.


A piece of stone tied at the end of a thread is whirled in a horizontal circle with uniform speed by hand. Answer the following questions:

  1. Is the velocity of stone uniform or variable?
  2. Is the acceleration of stone uniform or variable?
  3. What is the direction of acceleration of stone at any instant?
  4. Which force provides the centripetal force required for circular motion?
  5. Name the force and its direction which acts on the hand.

In a uniform circular motion, the speed continuously changes because of the direction of motion changes.


The angle subtended by the vector A = `5hat"i" + 3hat"j" + 12hat"k"` with the X-axis is ______.


If a particle moves with uniform speed then its tangential acceleration will be ______.


A particle performs uniform circular motion in a horizontal plane. The radius of the circle is 8 cm. The centripetal force acting on the particle is 15 N. Its kinetic energy is ____________.


A particle is moving in uniform circular motion with speed 'V' and radius 'R'. The angular acceleration of the particle is ______.


A disc has mass 'M' and radius 'R'. How much tangential force should be applied to the rim of the disc, so as to rotate with angular velocity 'ω' in time t?


A wheel is 0.25 m in radius. When it makes 15 revolutions per minute, its linear speed at the point on circumference is ____________.


A stone of mass 3 kg attached at one end of a 2m long string is whirled in horizontal circle. The string makes an angle of 45° with the vertical then the centripetal force acting on the string is ______.

(g = 10 m/s2 , tan 45° = 1)


The angular speed of the minute hand of a clock in degrees per second is ______.


The given graph represents motion with ______ speed.


A body moves in a uniform circular motion ______.


In uniform motion, an object travels equal ______ in ______ interval of time.


A flywheel at rest is to reach an angular velocity of 24 rad/s in 8 second with constant angular acceleration. The total angle turned through during this interval is ______.


For a particle performing uniform circular motion, choose the correct statement(s) from the following:

  1. Magnitude of particle velocity (speed) remains constant.
  2. Particle velocity remains directed perpendicular to radius vector.
  3. Direction of acceleration keeps changing as particle moves.
  4. Angular momentum is constant in magnitude but direction keeps changing.

A thin uniform circular disc of mass M and radius R is rotating in a horizontal plane about an axis passing through its centre and perpendicular to its plane with an angular velocity ω. Another disc of same dimensions, but of mass `1/4`M is placed gently on the first disc co-axially. The. angular velocity of the system is ______.


A wheel is Subjected to uniform angular acceleration about its axis. Initially. its angular velocity is zero. In the first 2 s, it rotates through an angle θ1, in the next 2 s, it rotates through an angle θ2. The ratio of `theta_2/theta_1` is ______.


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