physics
posted by kate on .
A 3.0 m long rigid beam with a mass of 100 kg is supported at each end. An 60 kg student stands 2.0 m from support 1. How much upward force does each support exert on the beam?
support 1
support 2

.......100..60......
..........v......v.......

^.......................^
R1.................R2
Take moments about R1,
R2*3=100*1.5+60*2.0
Take moments about R2
R1*3=100*1.5+60*1.0
Solve for R1 and R2. They should add up to 100+60. 
Deez........................................................................................................................................................................................................................................................................................................................................................Nutz

All of that stuff but than multiple R1, R2 by 9.8