Need help with home work.
What length of 71 cm in diameter(inside) pipe is required to make a water storage tank with a capacity of 94 litres?
What is the length in cm???
I am having trouble with this one.
Need help please, thanks.
Joanne
Need help with home work.
What length of 71 cm in diameter(inside) pipe is required to make a water storage tank with a capacity of 94 litres?
What is the length in cm???
I am having trouble with this one.
Need help please, thanks.
Joanne
The capacity is $\displaystyle 94\,\textrm{L} = 94\,000\,\textrm{mL}$.
So the volume is $\displaystyle 94\,000\,\textrm{cm}^3$.
You should know that the volume of a cylinder is given by the formula:
$\displaystyle V = \pi r^2 h$.
Since the diameter is $\displaystyle 71\,\textrm{cm}$ the radius is $\displaystyle 35.5\,\textrm{cm}$.
So $\displaystyle 94\,000\,\textrm{cm}^3 = \pi \left(35.5\,\textrm{cm}\right)^2 h$.
Solve for $\displaystyle h$.