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A 0.21-kg ball on a stick is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, the stick's tension is 18 N.
(a) Find the tension in the stick when the ball is at the twelve o'clock position.
T =
(b) Find the tension in the stick when the ball is at the six o'clock position.
A 4.00-kg model rocket is launched, expelling 54.9 g of burned fuel from its exhaust at a speed of 690 m/s. What is the velocity of the rocket after fuel has burned.
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