Question

how do you find the total tension of both strings (A and B)?

Help please i'm stuck for hours :S

http://i.imgur.com/THiS8.jpg

Answer 1

suppose the tension of string a is ta and b is tb

Answer 2

ta cos 60 + tb cos 30= 35

Answer 3

and tasin60=tb sin 30

Answer 4

can you do it now?

Answer 5

hello @zscdragon

Answer 6

yes, but why tasin60=tb sin 30, i mean how do you know the x component of string A equals the x component of string B

Answer 7

otherwise the object would move to one side

Answer 8

but in the picture we can see it is in equilibrium..

Answer 9

is it clear now?

Answer 10

yes, i have another question

Answer 11

The system is NOT in equilibrium, the middle block will eventually fall. But at current state, what is the total net force in this system?