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by resilient » Thu Feb 07, 2008 8:00 pm
on the formula V= 1/(2r)^3, if r is halved, then V is mutliplied by?


a. 64
b.8
c.1
d.1/8
e.1/64


I plugged in numbers yet got lost in the math..any help?

qa is b
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by Saffa » Fri Feb 08, 2008 3:07 am
One way of going about it is set r = 1

then V = 1/(2x1)^3 = 1/2^3 = 1/8

set r= 1/2

V = 1/(2 x 1/2)^3 = 1/1^3 = 1/1 = 1

Thus V is multiplied by 8: 1/8 x 8 = 1
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