A ball is fastened to a string and is swung in a vertical circle. When the ball

Question

A ball is fastened to a string and is swung in a vertical circle. When the ball is at the highest point of the circle its velocity and acceleration directions are: A ball with a mass m is fastened to a string and is swung in a vertical circle. When the ball is at the lowest point of the circle the tension in the string is: A child whirls a ball at the end of a rope, in a uniform circular motion. Which of the following statements is NOT true? The speed of the ball is constant. The velocity of the ball is constant. The radius is constant The magnitude of the ball's acceleration is constant. A small sphere is moving in a vertical circle of a constant radius at constant speed. The magnitude of the net force on the sphere at the bottom of the loop is greater than the net force at the top. at the top of the loop is greater than the net force at the bottom. Decreases as the sphere moves from the bottom to the top. is the same at the top of the loop as it is at the bottom of the loop. An object moves in a circular path at a constant speed. Compare the direction of the object's velocity and acceleration vectors. The vectors point in opposite directions. The vectors are perpendicular. The vectors form some acute angle. The question is meaningless, since the acceleration is zero.

Explanation / Answer

Solution::

1) B

2) B

3) B

4) A Since the weight getsadded up to the accelerating force, Force at the bottom of the circle is greater than that on the top.

5) The vectors are perpendicular. The velocity vector is tangential to the circular path while the acceleration vector points inwards , towards the center of the circle .

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