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geniusboy [140]
3 years ago
15

How do I solve this what dose this mean.

Mathematics
1 answer:
lapo4ka [179]3 years ago
8 0
I think that Jasmine is right because she makes more sense to me
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Step-by-step explanation:

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A closed cylindrical can of fixed volume V has radius r.a) Find the surface area, S, as a function of r.b) What happens to the v
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Answer:

Step-by-step explanation:

This question is incomplete; here is the complete question.

A closed cylindrical can of fixed volume V has radius r. (a) Find the surface area, S, as a function of r. (b) What happens to the value of S approaches to infinity? (c) Sketch a graph of S against r, if  V=10 cm³.

A closed cylindrical can of volume V is having radius r and height h.

a). Surface area of a cylinder is given by

S = 2(Area of the circular sides) + Lateral area of the can

S = 2πr² + 2πrh

S = 2πr(r + h)

b). Since surface area is directly proportional to radius of the can

S ∝ r

Therefore, when r approaches to infinity (r → ∞)

c). If V = 10 cm³ Then we have to graph S against r.

From the formula V = πr²h

10 = πr²h

h = \frac{10}{\pi r^{2}}

By placing the value of h in the formula of surface area,

S = 2\pi r(r+\frac{10}{\pi r^{2}})

Now we can get the points to plot the graph,

r       -2             -1         0       1            2

S    -13.72     -13.72     0    26.28    35.13

7 0
3 years ago
How many whole numbers are there with not more than 4 digits?
Flauer [41]
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7 0
2 years ago
Read 2 more answers
The water level in a lake changed by -28 centimeters in 7 days. The water level changed by the same amount each day. How much di
denis-greek [22]

Answer:

in 7 days level of water changed in lake= -28

the water level change each day= -28/7= -4cm

Step-by-step explanation:

7 0
2 years ago
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