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Lecture06 - Chapter 8 Potential energy and conservation of...

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Chapter 8 Potential energy and conservation of energy 1 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010
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Sample problem 3: Conservation of mechanical energy A chain with total mass m and length L is hanging with length d over the edge of the frictionless table. How much work is required to pull hanging part of the chain back onto the table? 2 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 d L d
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Sample problem 3: Conservation of mechanical energy A chain with total mass m and length L is hanging with length d over the edge of the frictionless table. How much work is required to pull hanging part of the chain back onto the table? 3 PHYS 2101, P.M.Shikhaliev LSU, Fall 2010 d Solution: Force applied to pull out the chain is variable. If length of the hanging part is x , then Work equals: L d
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Sample problem 4: Potential energy curve The potential energy of a diatomic molecule O 2 is given by expression where r is the distance between the two atoms and A and B are positive constants. (a) Find the equilibrium distance r 0 where the force between two atoms is zero. (b) Is the force repulsive or attractive when the separation is smaller and larger?
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