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15 Cards in this Set
- Front
- Back
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Momentum (p)
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p = mv
a measure of a moving object's tendency to continue along its present path (a vector) |
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In an isolated system, momentum is always ________.
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conserved
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Elastic Collisions
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-Mechanical Energy is conserved
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Inelastic Collisions
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-Colliding objects lose some of their mechanical energy to internal energy
p(initial) = p(final) |
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Impulse (J)
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-The change in momentum
J = d(mv) = F(avg)*dt |
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Ideal Machines
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-Ramp, lever, and pulley
-Reduce force, but don't change work |
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What happens when work is held constant?
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force and distance are inversely proportional
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Alpha Decay
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-An alpha particle (helium nucleus, 2 protons, 2 neutrons) are lost
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Beta Decay
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-The expulsion of an electron, resulting in creation of a proton
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Positron Emission
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-The emission of a positron when a proton becomes a neutron. A proton is transformed into a neutron and a positron is emitted.
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Gamma Ray
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-High frequency photon
-Electron + Positron = 2 gamma rays |
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Rest Mass Energy
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E = mc^2
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Mass Defect
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-Difference in energy between the nucleons and the individual particles
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Binding Energy
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-Energy holding the nucleons together, find by plugging in mass defect into E = mc^2
-The most stable nuclei have the strongest binding energy |
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T or F: Only fusion produces more stable nuclei
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F: Both fission and fusion produce more stable nuclei
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