a mass is held by 3 extensible strings with spring constant k1,k2 and k3 respectively.
Now, the string in the middle is having a length of l
that's all the info. given
find the tension of the 3 strings
please help!
http://imageshack.us/photo/my-images/821/helptd.jpg...
【questions】ionic & covalent compound
Hello, i have some questions about ionic & covalent compound, please help
1. is molecule include ionic compound or only covalent compound?
2. will boiling broke the ionic / covalent bond?
3. suppose there are 3 atoms,1 sodium and 2 oxygen, then the...
i know triple point is the temp. that water's(here use water as example)
solid、liquid、gas state can be existent .
http://www.youtube.com/watch?v=BLRqpJN9zeA
the video is amazing
and so, how can he change water's state?
(solid、liquid、gas state can be existent at the same time, but how can we...
today's biology lession
our teacher about cancer
he said that if we travell somewhere by aeroplane,
it's equal to take X-way 3 times
i don't understand why we have radiation through traveling by aeroplane
can someone explain to me, please
thank you so much
i can't understand
S_n = \sum_{i=1}^n \frac{1}{\sqrt{i}}\approx 2\sqrt{n} +\frac{1}{2\sqrt{n}} - \frac{1}{24n\sqrt{n}} -
\frac{35}{24}
can you explain it please?