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Sagot :
Answer:
The radius is increasing at a rate of 62832 cubic millimeters per second when the diameter is of 100 mm.
Step-by-step explanation:
Volume of a sphere:
The volume of a sphere of radius r is given by:
[tex]V = \frac{4\pi r^3}{3}[/tex]
How fast is the volume increasing:
To find this, we have to differentiate the variables of the problem, which are V and r, implicitly in function of time. So
[tex]\frac{dV}{dt} = 4\pi r^2\frac{dr}{dt}[/tex]
The radius of a sphere is increasing at a rate of 2 mm/s.
This means that [tex]\frac{dr}{dt} = 2[/tex]
How fast is the volume increasing (in mm3/s) when the diameter is 100 mm?
Radius is half the diameter, so [tex]r = \frac{100}{2} = 50[/tex]
Then
[tex]\frac{dV}{dt} = 4\pi r^2\frac{dr}{dt} = 4\pi (50)^2(2) = 62832[/tex]
The radius is increasing at a rate of 62832 cubic millimeters per second when the diameter is of 100 mm.
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