In one of our class sessions, I sat on a rotating seat with heavy weights in each of my hand. (a) As I pulled the weights to my chest, did my rotational inertia increase, decrease or did not change? (b) Did my rotational speed (angular speed) change? Why? Explain your answer.  
October 24, 2018
What happens after a high mass star leaves the main sequence? What types of stellar remnants will a high mass star leave behind? 
October 24, 2018
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an ion channel in a cell membrane carries 2.4 pA when it's open, which is only 20% of the time. (a) What's the average current in the channel? (b) If the channel opens for 1.0 ms, how many singly ionized ions pass through in this time? 

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