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physics fundamental: modern physics lesson 1 Chapter 24 practice quiz #8&9

 
 
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physics fundamental: modern physics lesson 1 Chapter 24 practice quiz #8&9
by Hongyu Shi - Tuesday, February 23, 2021, 9:57 AM
 

I have no idea how to start the problem.

 
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Re: physics fundamental: modern physics lesson 1 Chapter 24 practice quiz #8&9
by Hongyu Shi - Tuesday, February 23, 2021, 11:24 AM
 

I also have problem on question #10

 
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