Asked by Cyrus
a rectangular tank 28cm long and 18cm wide was filled with water to a dept of 7cm. When 12 marbles were added the level rose to 12cm. Find the average volume of the 12 marbles.
Answers
Answered by
Reiny
Change in volume
= (28)(18)(5) cm^3
= 2520 cm^3
This was caused by the 12 marbles
that volume was 12(4/3)πr^3
= 16πr^3
16πr^3 = 2520
r^3 = 2520/(16π)
r = (2520/(16π))^(1/3)
I got appr 1.69 cm
check my arithmetic
= (28)(18)(5) cm^3
= 2520 cm^3
This was caused by the 12 marbles
that volume was 12(4/3)πr^3
= 16πr^3
16πr^3 = 2520
r^3 = 2520/(16π)
r = (2520/(16π))^(1/3)
I got appr 1.69 cm
check my arithmetic
Answered by
Cyrus
so you are saying the average volume for 1 marble is appr. 1.69cm?
Answered by
Reiny
no, I found the average radius r
I was hoping you would be able to find its volume.
V = (4/3)π r^3 , (I used it)
I was hoping you would be able to find its volume.
V = (4/3)π r^3 , (I used it)
Answered by
Cyrus
OHHHH I'm so sorry, havent done this in years, now i understand thank you so very very much!!!
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