January 27th, 2015, 03:42 AM  #1 
Newbie Joined: Jan 2015 From: helsinki Posts: 3 Thanks: 0  how to calculate the force needed?
How to solve these? Don't mind the 50N in the last image. Last edited by kaizzuu; January 27th, 2015 at 03:50 AM. 
January 28th, 2015, 01:24 PM  #2 
Senior Member Joined: Mar 2011 From: Chicago, IL Posts: 214 Thanks: 77 
1st picture: $\displaystyle F_{left}a=F_{right}b$ $\displaystyle 75kg\cdot 9.8\frac{N}{kg}\cdot 0.5m=F_{right}\cdot 2.5m$ $\displaystyle F_{right}=\frac{75\cdot 9.8\cdot 0.5}{2.5}N$ 
January 28th, 2015, 01:29 PM  #3 
Senior Member Joined: Mar 2011 From: Chicago, IL Posts: 214 Thanks: 77 
3rd picture: F=50N (same). 4th picture  solution is same like for 1st. Last edited by skaa; January 28th, 2015 at 01:31 PM. 

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