Recent content by SiriusA

Homework Statement A silicon chip used in an integrated circuit of a computer has a mass of 4.86 mg. How many silicon atoms are present in this chip? Homework Equations no. of moles of element = no. of particles / 6.22 * 10^23 particles No. of moles of a element : mass of element...

Yeah jtbell , you are 100 % correct , sorry for my "weak" memory though I am only 14 :) . I was just about to correct that : "A Greek named Erasthothanes noticed this phenomenon in 250 BCE at Aswan, Egypt. He’d previously measured the length of his small solstice shadow in Alexandria, and he...

Well I just took a introductory course in physics at Udacity.com a while back . In that , I learned about Archimedes attempt at calculating the radius of Earth . According to that , at a place near Syracuse , Greek , the sun rays fall at 90 degrees on the summer solstice . Just wanted if you...

First, thanks Mark for replying. But the point I wass trying to make is that of we consider a 180 degree line at Bearing 0 that is at North. Then after we subtract 90 and the other angle we'll be having only a part of angle P and not the whole angle so we can not solve this way.

I think that the side PR , that is not a straight line . So if we get the angle 52 we get it to somewhere before the start of PR .

I considered the second way of solving because I haven't learned yet the first way . But the answer is coming a little away . The diagram which I showed was a little off-the-track . Look at this one : I think the method will change slightly now .

Homework Statement A man sails 30 km from a port P to a lighthouse Q on a bearing of 128 Degrees. Then he sails another 25 km to R on a bearing of 295°. Calculate the distance of PR. Homework Equations N/A The Attempt at a Solution Well , actually I solved all of the problems before this...