0
If that is 4000N of normal force (?) assuming its just at rest with that normal force, then the force of gravity is equal to the normal force
Fg=4000
Fg=mg
4000=m(10)
4000/10=m
m=400kg
GPE=mass(acceleration due to gravity)height
GPE=400kg(10m/second squared)12m
GPE=48,000 Joules
W=E1+E2
E1=0
E2=48,000
W=48,000
I'm pretty sure that's right. Somewhat correct me if it isn't.
What else can I help you with?
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The density of a substance stays the same, no matter how much space it takes up.
Different sections of beam?
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