lecture25_notes

lecture25_notes - A 0.1 kg mass with an initial speed of 1...

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A 0.1 kg mass with an initial speed of 1 m/s collides with a 10 kg mass which is initially at rest , and sticks to it . The speed of the two masses after the collision is approximately : A. 0 m/s B. 0.01 m/s C. 0.02 m/s D. 0.5 m/s E. 1 m/s
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How the Dinosaurs Died
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~65 million years old ~180 km in diameter - caused by impact of asteroid or comet ~10 km in diameter Gravitational Map of Buried Crater :
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Chicxulub asteroid/comet numbers: R a = 5 km m a = (4/3) π R a 3 ρ a 3 × 10 15 kg v a,I = 20 km/s K a,i = (1/2) m a v a,i 2 6 × 10 23 J
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Assume sticking collision with Earth : m a v a,i + m earth (0) = (m a + m earth ) v f Since m earth 6 × 10 24 kg >> m a, V f,earth (m a / m earth ) v a,i 1 × 10 -5 m/s ! K f (1/2) m earth v f 2 6 × 10 14 J << K a,i K = K a,i - K f 6 × 10 23 J = energy released upon impact
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Mohawk, Eniwetok Atoll July 1956 350 kilotons Romeo, Bikini Atoll March 1954 11 Megatons 1 Megaton = 4 · 10 15 J
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K = K a,i - K f 6
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This note was uploaded on 02/20/2008 for the course PHYS 2207 taught by Professor Liepe, m during the Fall '07 term at Cornell.

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lecture25_notes - A 0.1 kg mass with an initial speed of 1...

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