Posted by Mackenzie on Monday, February 4, 2008 at 8:03pm.
I assume this is calculus class.
Surface=PI*radius^2*2 + PI*radius*height
Surface= PI*radius^2 * 2 + PI*radius*volume/(PI*radius^2)
Take the derivative of surface with respect to radius, set it to zero, and solve for radius.
i am only in 7th grade! Could you explain that a little more to me
Sorry, this question is a typical college level calculus question. For a seventh grader, it is a little harder.
Try this. Graph Surface area vs radius according to the equation I gave you...
Surface= 2*PI*radius^2 + 100/radius
You will see a graph that has a minimum. If you have a graphing calculator, it is easy to graph.
Once you have the minimum, read the radius point on the curve. Then,
This problem is a bit advanced for a seventh grader.
i have an answer but i dont know if it is right! will you tell me if i am right or wrong.
i got that the dimensions 31.83098862 ft by 2 ft would have the least surface area for the problem.
am i right or wrong?
can you help me????
I dont get that. I get the diameter to be 5.84 feet (twice the cube root of 25).
You can figure the height . I get less than four feet.
how did you figure that out?
this is what i did!
100 divided by pie and i got 31.83098862 ft and then that multiplied by 2 is 100!
please help me
One note. I included the ends in the surface area. If they are not to be included, then it is a different answer.
MATH - what should be the dimensions of the cylinder if you wanted it to have ...
Geometry - what are the dimensions of two cylinders where the first cylinder has...
Pre Algabra - If there is a cylinder that has a volume of 100 ft, what would be ...
surface area - Find the surface area of the cylinder in terms of pi. I know the ...
Math: Geometry - The circumference of the base of a cylinder is 16 cm. The ...
Math - Optimization Problem A right circular cylindrical can of volume 128t&...
Physics - Two conducting thin hollow cylinders are co-aligned. The inner ...
Geometry - Two cylinders have the same volume. If the radius of cylinder I is 3 ...
physics - Two conducting thin hollow cylinders are co-aligned. The inner ...
physics - If the aim is to let a 700 kg pump float on the surface of water, how...
For Further Reading