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92 Chapt. 9 Momentum
b) Just after the explosion, what must the total
y
direction momentum be of the two fragments
that went straight up and down? Explain why it is this value.
c) How far does the 3rd fragment go in the
x
direction if it starts a height
y
0
above a Fat plain
assuming no air drag? Derive the formula for the distance including a derivation of the
the horizontallaunch projectile range formula. Give the answer in terms of given variables
and
g
.
009 qfull 00280 3 3 0 tough thinking: conservation of momentum in a boat with King
Extra keywords:
boatKingyou system
3. Your dog King—a she, but somehow that wasn’t obvious before the puppies (“Ooh, arn’t they
sweethearts.”)—is on a long Fatbottomed boat (10 m in length to be precise) on a placid lake.
King now muscles in at 90 kg—you must not have been listening when her grandsire Gross Hans
the St. Bernard was being aired—“he could haul an SUV”. You, also on the boat, however, are
a petite 50 kg—which makes opening the door when you get home from work, King keening just
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 Fall '06
 Buchler
 Physics, Momentum

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