Posted by Lanise on .
physics  drwls, Sunday, January 24, 2010 at 2:50am
Compute the angle of the strings from vertical. It is sin^1 (8.5/40)
Call this angle A
If the string tension is T
T sin A = F (the Coulomb force)
T cos A = M g
tan A = F/Mg
You need to say what the units of the mass are. All you said was 0.09
The mass is 0.09 gm.
What does sin^1 (8.5/40)mean. Is this sin to the negative 1 times 8.5 divided 40.
And to find T is this Mg/cosA to find T?

Physics 
bobpursley,
sin^1 means the angle whose sine is ...
in this case the angle whose sine is 8.5/40
Some write this function as Arcsin ( )