Recent content by yuen47

anybody please?

Maybe the angle was of the one not to the x axis, but the angle up that forms with the line perpendicular to the x axis. If that's so then it'd be sin theta. But like I said, as long as you end up with the right answer - regardless of which angle you used and whether you used sin or cos, as long...

Then again you did say you have the answers...does it show a diagram of how the FBD was presented? if so then obviously it should show why sin was used.

The normal force is just directional , and how you calculate it you will not necessarily use sin always... you may have to use cos sometimes, depending on how you drew your component forces, and as long as you can prove in your FBD that it is cos, then that's what it is. It's not necessarily...

I've seen questions like this, and when I drew a FBD I always drew it lengthwise to the car, so on a graph, looking from the front or back of the car, the x-axis is the ground, and the car's direction is headed in or out of the page. Therefore, the angle theta would be with respect to the x...

Homework Statement A long rod, insulated to prevent heat loss along its sides, is in perfect thermal contact with boiling water (at atmospheric pressure) at one end and with an ice-water mixture at the other. The rod consists of a 1.00m section of copper (with one end in the boiling water)...