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$Old$ 11-14-2008, 09:45 PM

camstill $camstill is offline$

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$Default$ I can not get the answer from the book could you please explain

Estimate the volume in metric units and compute the acual volume of the item:

Oil in a barrel that has a height of 1 m and a diameter of 0.5m

The answer in the book: 0.20mcubed

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$Old$ 11-14-2008, 09:52 PM

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Originally Posted by camstill $View Post$

Estimate the volume in metric units and compute the acual volume of the item:

Oil in a barrel that has a height of 1 m and a diameter of 0.5m

The answer in the book: 0.20mcubed

The barrel is a cylinder I assume ....? With radius r = 0.25 m ....

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$Old$ 11-14-2008, 11:58 PM

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So don't you use the formula V=(pi)(rsquared)(l)

and I still don't get that answer

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$Old$ 11-15-2008, 01:56 AM

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$V = \pi r^2h$

$r = \frac {d}{2} = \frac{0.5\ m}{2} = 0.25\ m.$

$\Rightarrow V = \pi \times (0.25)^2 \times 1$

$\Rightarrow V = 0.20\ m^3$ (correct to $2$ sig. fig.)

I hope that helps.

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$Old$ 11-15-2008, 03:23 AM

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Originally Posted by camstill $View Post$

So don't you use the formula V=(pi)(rsquared)(l)

and I still don't get that answer

Then you're making a data entry error with your calculator.

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1. There are two things you should never try to prove ...... the impossible and the obvious.

2. If you always do what you've always done, you'll always get what you've always got.

3. Lack of planning on your part does not constitute an emergency on my part.

4. Pressure makes diamonds.

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