mod 6 conservation of energy

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13 Terms

1
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system can be

single object/particle, collection of particles, region of space, varying in size and shape

2
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unisolated system

exchange with something that is not part of the system (e.g. if system is just a block, friction from the table makes it unisolated)

3
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energy transfers into a system through

mechanical work

4
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W = (sum of energies)

ΔΚ + ΔU + ΔEinternal 

5
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mechanical energy is conserved in

an isolated system with no non-conservative forces

6
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speed of pendulum at bottom

√2gL(1-cosθ)

7
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tension in rope at bottom of pendulum

mg(3-2cosθ)

8
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Wfriction = 

ΔK + ΔU = sum of non-conservative work

9
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power

time rate of energy transfer; P = ΔW/ΔT

10
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average power

W/Δt

11
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instantaneous power

dW/dt

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1 horsepower =

746 W

13
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P in terms of v

F→ • v→