[PHYSICS 181] - Final Exam Guide - Everything you need to know! (38 pages long)
29 Mar 2017
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Phys181 lecture 29 variable mass i. Question: a bullet of mass m=5gm is shot through a wooden block of mass m= 1 kg. The block is suspended from a string of length l=2m and rises a height h=0. 38 cm after being hit by the bullet. If not, before = after (energy is conserved) If yes, change in energy before + work done by these other forces = after. Variable mass problems: f = dp/dt is the right framework, not f = ma. Phys181 lecture 30 variable mass ii. Question: question: a freight car is moving with a uniform velocity v along a linear section of railway track. Sand falls from a stationary hopper above the track, vertically onto the bed of the freight car, at a rate of dm/dt. Introduction to center of mass: the center of mass is the geometric point that is based on masses and their radii, the center of mass equation is given below:
