i remember making somehting to protect an egg for some class, i used a styrofoam from a box which came with my laptop, the foam was very good quality, and i did the whole cude thing, cut the cube in half, amde a place for the egg. and taped it up
to my surprise there was no way for me to hurt...
number 1 is pretty easy, think about it, gasses don't acquire different pressures, so if you inject more gas (no matter what it is) into a container whcih does not change shape the pressure of the whole thing goes up...
i think,
here's what i see, you want to make 1/5th of a litre of .0063 M soultion, using X grams of BaF2, so first you find how many Moles of BaF2 there will be in the solution, and multiply the value you get by the gram molecualr weight of BaF2,
does that let you understand the problem?
EDIT: i...
since the Tan curve goes in a period of 180 degrees, you take the value that you got as one of the solutions and add or subtract 180 to/from it, and every time the result is within the rang of 0 -360, so:
you do
\tan (x - 30) = \tan 50
x = 80
then
80 \pm 180n = x
and the only...