00:01
What is the required length of the rod? so i've written our given values at the top of our problem.
00:07
And the density of our liquid is equal to row not l divided by l minus h, where l is our length and row not is the density of our rod.
00:18
So we can use our above values to get some expressions.
00:21
So we're told our row is 0 .98, and so we can substitute in a row not l divided by l minus 0 .2.
00:31
Centimeters.
00:32
So this is one expression.
00:34
Then we also get 1 .14 is equal to row not l divided by l minus 1 .8 centimeters.
00:42
So if we divide these two equations, then we write a new equation.
00:47
L minus 1 .8 divided by l minus 0 .2 is equal to 0 .98 divided by 1 .14.
00:56
And now we can rewrite and solve for so rewriting, we get .16l equal to 2 .05 minus 0 .196.
01:07
And so the length of a rod is 11 .6 centimeters.
01:14
Now for b, what must be its average density? so row not is equal to row l minus h divided by l...