reflection 4

# reflection 4 - brown(twb493 Reection 4 turner(57340 This...

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brown (twb493) – Reflection 4 – turner – (57340) 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001(part1of9)10.0points Initially, in what form is the energy of the atoms? 1. Pure potential correct 2. Mixed kinetic and potential 3. Pure kinetic Explanation: 002(part2of9)10.0points What happens to the center of mass of the atoms over time? Ia. It travels at a constant nonzero velocity. Ib. It remains motionless. Ic. It ’jitters’ randomly, staying within the cluster. Id. It leaves the cluster. Why? IIa. The external force on the cluster is zero. IIb. The average distance of the atoms from the center of the cluster changes, causing the center of mass to move. 1. Ia, IIb 2. Id, IIa 3. Ib, IIb 4. Ia, IIa 5. Ib, IIa correct 6. Ic, IIb 7. Ic, IIa 8. Id, IIb Explanation: 003(part3of9)10.0points Which of the following are true? (Remember that model calculations are never 100 percent accurate. If you want to verify your answer, you can always decrease deltat to see if the calculation comes closer to your choice.) The total energy of the system Ia. decreases. Ib. stays the same. Ic. increases. The total momentum of the system IIa. changes. IIb. does not change. 1. Ia, IIa 2. Ic, IIa 3. Ib, IIb correct 4. Ic, IIb 5. Ib, IIa 6. Ia, IIb Explanation: 004(part4of9)10.0points Now let us collide the probe with the clus- ter. Set probeVelocity = vector (8 , 0 , 0) and probeStrength = 1. ( probeVelocity will re- main the same throughout the remainder of this assignment.) What do you observe? 1. The cluster is highly fragmented and its constituents scattered in many directions. This would be akin to an egg shattering on the floor. 2. The cluster remains intact and gains some translational kinetic energy (Δ p cluster > 5). This would be akin to a bullet punching

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brown (twb493) – Reflection 4 – turner – (57340) 2 through a ball of jelly. 3. The cluster remains intact and its trans- lational kinetic energy is not appreciably changed (Δ p cluster < 5). This would be akin to the very weakly interacting neutri- nos streaming through your body right now.
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