Why does Michael Jordan appear to defy gravity as he slam dunks the ball? (After you have thought about this question, see page 68 of your textbook.)

a. He is an extraordinary athlete who is able to jump much higher than most humans.
b. His motion is that of a projectile, and a projectile's motion is such that its vertical speed is minimal while at the high point of its trajectory.
c. He is able to use air resistance to cushion his vertical motion.
d. He is in the process of moving upward.
e. His horizontal motion keeps him above the ground.


b

Physics & Space Science

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When aqueous solutions of Na2CO3 and BaCl2 are mixed, the products are NaCl and ______________

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A) indicate the presence of an extensive atmosphere. B) imply the nearby presence of a massive body. C) indicate the presence of a powerful magnetic field. D) show the planet's orbit isn't stable. E) show we don't fully understand gravitational forces yet.

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The direction of a magnetic field at a point can be determined by __________

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