Consider an object on a rotating disk a distance r from its center, held in plac

Question

Consider an object on a rotating disk a distance r from its center, held in place on the disk by static friction. Which of the following statements is not true concerning this object? If the angular speed is constant, the object is not accelerated The object always has a centripetal acceleration except when the angular speed is zero. O If the disk has an angular acceleration, the object has both a centripetal and a tangential acceleration. The object has a tangential acceleration only if the disk has an angular acceleration. O If the angular speed is constant, the object must have constant tangential speed

Explanation / Answer

""This is much like swinging a weight on a string. The tangential speed of the weight is in meters or feet per second. If it takes a second to swing the weight in a circle with a circumference of 10 feet"", then the tangential speed is 10ft per second. 10ft/s a) is true "
b) has to be false because if the weight were not accelerated, the string attached to it would not have tension.
c) true, the speed is constant as long as the rpm are constant
d)true but centripetal acceleration does not require angular acceleration, only angular velocity.
e)true: as long as the circular motion continues, centripetal acceleration occurs. When the angular speed decreases to zero, centripetal acceleration likewise ceases.""

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