Who's good at Physics?

I was in one of my computer science classes...we'd leave the room, the instructor would get inside our machine and swap a working part for a known non working part. We'd go back in the room and troubleshoot it until we found the bad part.

I hung a "Broken do not use" sign on mine. Told him I was hungry and going to lunch now. He said I was gonna be an excellent tech.

 

53.13deg

 

How did you get it so fast?? I got the answer from my instructor, but have no idea how the hell it is done!

 

lol is 53.13deg correct?

 

yeh! haha

 

divide the mass in the middle by 2 and u get 4kg. this simplifies the problem so you can take just the left side.

Now imagine cutting the 5kg cord just to the right of the pulley. replace the cut portion with an arrow which points up and left. this is the tension in the cord.

now draw the weight vector coming from the middle mass. it goes directly down with W=4.

You now have two arrows and with the laws of vectors u can transmit the downward weight of 4kg over to make two ends of a triangle. Then use trig.

Sin(x)=(4/5)
sin-1(4/5)=x
x=53.13

 

Nice play Tommy, I was pretending to have left the computer so I ddn't have to do another one haha.

My head hurts time for a beer.

 

Haha yea i'm down for anything that distracts me from work right now.. and i feel u on that beer. Gonna crack a few when i get home

 

Hey thanks guys!!! I'll be back tomorrow night haha

 

jeez. I thought i was smart...but apparently im not

 

Oh great, was gonna take physics next semester......