Recent content by chawkdee

Thanks a lot - great help!

[SIZE="2"]Bones of the wooly mammoth have been found in North America. The youngest of these bones has a 14C activity per gram of carbon that is about 21% of what was present in the live animal. How long ago (in years) did this animal disappear from North America? I'm struggling with this...

So P2 is atmospheric pressure = 1 x 10*3 Pa (density x g x h2)= 1x10*3 x 9.8 x 46 (do we need the 46 if it's open to the air?) (density x g x h1)= 1x10*3 x 9.8 x 22 v1=0 If the above are correct, I can do it - thanks a lot!

I can't figure out how I can find the Pressure if it is not open to the air.

Minger, thanks for your time. Firstly, id the speed correct? The exit pressure:- pressure of liquid = specific gravity of liquid x height of liquid xgravitational acceleration sp gravity of water=1 h=46m g=9.8 p=1 x 9.8 x 46 p= 450 ?

Homework Statement A cylindrical water tunnel runs through a dam. The entrance to the tunnel has a radius of 1.30m and is located at a depth of 22.0m below the surface of the water. The other end of the tunnel has a radius of 0.840m., is 46.0m below the water's surface, and is open to the air...

Homework Statement A glass of water has a volume of 6.0 x 10*-4 cubic metres. How many moles of water molecules are there in the glass? Homework Equations The Attempt at a Solution I know it has something to do with Avogadro’s number but can’t figure out exactly what to do...

Sorry not very clear - I can't figure out sqrt{3}T(sqrt{3}/2) I thought sq3 x (sq3/2) would be sq3 but seemingly not?

Homework Statement T(1/2)+ \sqrt{3}. T ( \sqrt{3}. /2) = 100 Homework Equations what is T? The Attempt at a Solution

n - number of moles N - number of molecules

nRT ??

If anyone has time, could you please show me the working of this problem. Greatly appreciated b]1. Homework Statement [/b] If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, and a temperature of 87C, how many moles of gas do I have? Homework...