handa (nh5757) – HW11 – meth – (55830)
1
This
printout
should
have
7
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
001
10.0points
A rock is thrown into a still pond and causes
a circular ripple. If the radius of the ripple is
increasing at a rate of 4 ft/sec, at what speed
is the area of the ripple increasing when its
radius is 6 feet?
1.
speed = 49
π
sq. ft/sec
2.
speed = 47 sq. ft/sec
3.
speed = 51 sq. ft/sec
4.
speed = 50 sq. ft/sec
5.
speed = 48 sq. ft/sec
6.
speed = 47
π
sq. ft/sec
7.
speed = 48
π
sq. ft/sec
8.
speed = 50
π
sq. ft/sec
002
10.0points
A point is moving on the graph of
xy
= 5.
When the point is at (3
,
5
3
), its
x
coordinate
is increasing at a rate of 3 units per second.
What is the speed of the
y
coordinate at
that moment and in which direction is it mov
ing?
1.
speed =
11
3
units/sec, increasing
y
2.
speed =

8
3
units/sec, decreasing
y
3.
speed =
8
3
units/sec, increasing
y
4.
speed =
5
3
units/sec, decreasing
y
5.
speed =

5
3
units/sec, decreasing
y
6.
speed =

11
3
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 Spring '10
 Gualdini
 Probability theory, 20 ft, 8 FT, 5 ft, 7 ft

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