Homework Help: MATH

Posted by Anonymous on Tuesday, September 28, 2010 at 7:39pm.

When a concrete structure is built, and engineer often performs a slump test on the concrete to ensure that it is of suitable strength and consistency. The engineer fills a truncated cone with bottom diameter 200mm, top diameter 100mm and height 300mm with concrete. The engineer then places the cone on the grounf and lifts off the cone. After period of time, she measures the amount of that the top of the cone has slumped to decide if concrete is appropriate.

a) Original cone from which the slump test cone was derived had height of 600m. What was volume of original cone? Express answer to nearest cubic mm.

The formula for this is:

V = 1/3 * 3.14 * r2 * h

r2 means r squared, I can't make it small.

I went 100m * 200m and came up with the answer 20000. To get the radius I just divided 20000 by 2 and got 10000.

This is what I did:

1/3 * 3.14 * 10000 * 10000 * 600

I got 62800000000mm

Is that right?

MATH - Reiny, Tuesday, September 28, 2010 at 8:05pm
just sub into the formula
V = (1/3)πr^2 h
= (1/3)π(100^2)(600)
= (1/3)π(10 000)(600)
= appr. 6 283 185 mm^3

(you have to square 100 first, according to the rules of order of operation)

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