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homework 07 – NOORANI, ZOHEB
1
Latest unpenalized work: Feb 1 2008 Friday
04:00 (after this date you can not make a
perfect score). Work cuto±: Feb 2 2008, 4:00
am.
Question 1, chap 3, sect 99.
part 1 of 1
10 points
A hunter wishes to cross a river that is
1
.
2 km wide and that ²ows with a speed of
3
.
9 km
/
h. The hunter uses a small powerboat
that moves at a maximum speed of 14 km
/
h
with respect to the water.
Draw the vectors to scale on a graph to
determine the answer.
What is the time necessary for crossing if
the boat goes directly across the river to the
opposite bank?
Answer in units of min. Answer within a
tolerance of
±
5 percent.
Question 2, chap 3, sect 99.
part 1 of 2
10 points
A ship cruises forward at
v
s
= 3 m
/
s rel
ative to the water. On deck, a man walks
diagonally toward the bow such that his path
forms an angle
θ
= 27
◦
with a line perpen
dicular to the boat’s direction of motion. He
walks at
v
m
= 5 m
/
s relative to the boat.
Draw the vectors to scale on a graph to
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 Spring '08
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