Hi
Im a bit confused on working out trig equations. I know all the rules, but something doesn't make sense to me.
There is a question in my excercise book, which i worked out and i ended up with having to solve:
Sin 5 = 117.8 / x
Using the normal rules of equations, i got
x sin 5 = 117.8
117.8 / sin 5 = x
x = 1351
But the book said to do:
117.8 sin 5 = x
x = 10.3
Im a bit confused on why this works. Surely you multiply by the the denominator. Any explanations?
Here it is:
Its part iii im stuck on.
I need to find the force on the horizontal before i can use f = ma to find the acceleration. This basicly simplifies to this:
(Edit: the angle in this diagram should be 5' not 15')
Sin = opp / hyp
Therefore in this example, wouldnt sin 5 = 117.8 / hyp ?