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, *1 N533 3 i??? E E 17.”: 5 A B—kg slender rod rotates in a vertical plane about a pivot at B.
:A spn‘ng of constant k = 300 N/m and of unstretehed length 120 mm is at
gmched to the rod as shown. Knowing that in the position shown the rod has
gm angular velocity of 4 rad/s Clockwise, determine the angudar velocity of the
£er after it has rotated through (a) 90°, ([2) 180°. 3 i .I
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I 11?. 19 A 73—kg gymnastis executing a Series of full‘Circle swings an AR
horizontal bar. In the position shown he has a small and negligible eloclngse angular velocity and will maintain his body straight and rigid as he swms ,
downward. Assuming that during the swing the centroidal radius of gratis? ‘ of his body is 457 mm, determine his angular velocity and the force exerted
on his hands after he has rotated through (a) 90“, (b) 180? (if)
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L/ ‘W‘? ’2: ¢ a g ; F}?qun 1"; If”) :3 b: ‘. a “1? 0'” , .ﬁ ﬁk/ﬁﬂﬁééwﬁwwaéagé‘jcf‘ z/ 1N) ngai‘lf ‘37.?21’ ant? 31122 A slender 6kg rod can rotate in about a pivot at B, A spring of constant k = 600 N/m and
length of 225 mm is attach ed to the rod as shown. Knowing ﬂat the m (
released from rest in the g
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 Fall '08
 MOORTHY

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