PHY 121 Ch 9 Lecture

PHY 121 Ch 9 Lecture - 1 Lecture 16 Tuesday, March 18 2 A...

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Unformatted text preview: 1 Lecture 16 Tuesday, March 18 2 A radian... A. has units of m (meter). B. has units of /m (degrees/m). C. has units of m/ (m/degrees). D. has no units. 3 The expression A. Is valid only for constant angular acceleration. B. Is valid only for constant angular velocity. C. is valid only for short times. D. is valid for any type of rotational motion. ! = ! + " z t + 1 2 # z t 2 4 The tangential component of acceleration A. is the same for all points in the rotating body. B. is zero if the angular acceleration is zero. C. is proportional to the angular velocity. D. is inversely proportional to the distance r to the axis of rotation. 5 The centripetal component of acceleration A. is zero if the angular acceleration is zero. B. is proportional to the angular velocity. C. is proportional to the square of the angular velocity. D. is proportional to the square of the distance to the axis of rotation. 6 Extended object problem When an extended object rotates about an axis, the velocity of each point in the object is different depending on its distance to the axis of rotation. Yet the motion is completely defined by how many radians per seconds the object rotates. Therefore, there must be a way of determining each points velocity based only on this information... 7 Vector (cross) product is perpendicular to both and ....
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PHY 121 Ch 9 Lecture - 1 Lecture 16 Tuesday, March 18 2 A...

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