ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Physics => Topic started by: evaporade on May 06, 2009, 11:36:46 am

Title: materials & structures itute Q13 2009
Post by: evaporade on May 06, 2009, 11:36:46 am: (http://img164.imageshack.us/img164/8310/vcenotesforum2.gif)
Answer?
Title: Re: materials & structures itute Q13 2009
Post by: /0 on May 06, 2009, 06:53:10 pm: Let the plank have length $L$ . Let $T_x$ act at $0.8L$ and $T_y$ act at $0.9L$ . (this is arbitrary)

Taking torques:

So $T_x\sin{30^\circ}(0.8)L+T_y\sin{30^\circ}(0.9)L = \tau_{clockwise}=constant$

$0.4T_x+0.45T_y =constant$

Hmmm... that didn't tell us much... i'm guessing it's D but i'm not sure

I'm always suspicious of the answer D, it's always the least common answer