(a) Why do airplane pilots prefer to take off with the airplane facing the wind?
(b) A tall Styrofoam cup is filled with water. Two holes are punched in the cup near the bottom, and water begins rushing out. If the cup is dropped so it falls freely, will the water continue to flow from the holes? Explain.
(c) A submerged can of Coke soda will sink, but a can of Diet Coke soda will float. Explain.
(d) Why does the stream of water from a faucet become narrower as it falls (as in fig. below)?