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A50.0 mg sample of an unknown radioactive substance was placed in storage and its mass measured periodically. after 19.7 days, the amount of radioactive substance had decreased to 3.13 mg. what is the half-life of the unknown radioactive substance?
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Askydiver has reached terminal velocity—she now falls at a constant speed, so her acceleration is zero. is there a net force on her? if so, what is the direction?
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How could the action force of a canoe moving through water be increased? ....
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