Question

訪客

求第17題

人

14. Profit The profit

16.

人2/ 2 / Wcd/e

Figure for 17                            Figure for 18
18.

95

。Volume_AIl edgaes of a cube

 

Pro                hom selling x units Of a product
ls glven by 2三 510N    0

atarate ot 9 units per dl
the prottt when (am) 、 二 4

The sales are Jncreasing
ay. Find the rate Of change Of
00 units and (bD)文三 600 unjts,

qre expanding at a rate
How fast is the volume

changing when each edge is (a) 2 centimeters and
(b) 10 centimeters?

ot 6 centimeters per second,

Surface Area_AI edges ofacube are expanding at a
Tate of 6 centimeters Per Second. How fast is the surface

area changing when each edge is (a) 2 centimeters and
(b) 10 centimeters?

。 Boating_A boat is pulled by a winch on a dock, and

te winch is 3 meters above the deck of the boat (See
figure). The winch pulls_the Tope at arate of 1 meter
per second. Find thexspeed 6fthe boat when 5 meters 9t
Tope 1S out. What happens to the Speed of the boat as it
gets closer and closer to the dock?

 

Shadow Length “Aman 2meters tall walks at arate 0f
].5 meters per second away from a light that is 5 meters

aboye the ground (see figure).             |
(a) When he js 3 meters from the base of the light, at
人          和              生0)
what rate js the tip of his shadow moving。
(b) When he js 3 meters from the base of the at
what rate js the Jength of his shadow changlng。

Air Traffic_Control An airplane flying at an altitude
Of 10 kilometers pasSes directly over aradar 蟬戰品 品
figure). When the airplane is 26 kilometerS away ($ 三 26),

由 卅0      ee

 

21,

22

23

24

12
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