# lec13 - Physics 140 Fall 2007 lecture#13 18 Oct Ch 8 topics...

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Physics 140 – Fall 2007 lecture #13 : 18 Oct A 50 minute class period lasts roughly one micro-century. Enrico Fermi Ch 8 topics: • elastic and inelastic encounters • collisions in two dimensions Announcements: • check scores on SAMS send score corrections within two weeks of occurrence Homework set #6 closes in <15 hours. Half of you need to get going… Set #7 opens today, closes next TUESDAY.

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The baby cannon on the lecture bench is aimed to shoot at some angle ! above the horizontal. Since it is on wheels, it will recoil freely when it fires the tennis ball. Viewed from your seat, what angle above the horizontal does the tennis ball’s trajectory make as it emerges from the cannon’s muzzle? 1. An angle larger than ! 2. An angle smaller than ! 3. The same angle ! The kinetic energy of an object of mass m and velocity v, K = mv 2 / 2, can be rewritten in terms of momentum, p = m v , becoming K = p 2 / 2 m. At fixed momentum, lighter objects have more kinetic energy than massive ones.
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