- #1
blutoonwcarrotnnail
- 14
- 0
A ten Newton block is hanging from a line, goes up and over a pulley and to the right at a 90 degree angle. It hits an equilibrium point. At this eq point a line leaves upwards of tension T2 at 45degrees. Also at this eq point a string hangs down of unknown N.
Here are the components to find the second block:
Fx = T2Cos45 + 10N
Fy = T2Sin45 - N
This yields a T2 of 14.1 which is plugged into Fy yielding an N of 9.96.
Why is the 10N in Fx added and not subtracted? The component for it (T1x) is 180 degrees from its origin of the x-axis in quadrant 1. Cosines in quadrant 2 and 3 in trigonometry are both negative. Why are we adding the weight? It should be subtracted. Thanks.
"It's better to burn out then fade away" -DL 1983
Here are the components to find the second block:
Fx = T2Cos45 + 10N
Fy = T2Sin45 - N
This yields a T2 of 14.1 which is plugged into Fy yielding an N of 9.96.
Why is the 10N in Fx added and not subtracted? The component for it (T1x) is 180 degrees from its origin of the x-axis in quadrant 1. Cosines in quadrant 2 and 3 in trigonometry are both negative. Why are we adding the weight? It should be subtracted. Thanks.
"It's better to burn out then fade away" -DL 1983