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Homework 5
Geog210a
Due: November 4, 2011
Text Problems
:
7.3.3, 7.3.5, 7.3.10, 9.4.3,
9.4.5, 9.4.9, 9.6.1, 9.6.6, 9.6.7,
9.6.16
DV Problems
:
1. A spherical container of liquid (a party ball) with a 22" diameter is drained of liquid
(beer) at a rate which varies in time as F
loss
= 1.2 + 0.55 t; where F
loss
is in units of
cubic feet per hour and t is in units of hours.
a) How long will the party last? Hint: the party ends when the party ball empties.
b) If F
loss
= 1.2 e
0.28t
, when will the party end?
c) Will you need to get another spherical container of liquid (make a beer run)?
Make plots too using Matlab…
2.
The instantaneous amount of happiness (in arbitrary units, H) you derive from being
around your drunk uncle at Thanksgiving is a function of time of the day (t = hours
since daybreak) and the number of beers he has consumed (b = number of bottles
consumed so far that day), i.e.
H(t,b) = 952 + b t – b
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 Fall '09
 Davey

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