374bhw7 - HW#7 Phys374Spring 2007 Prof. Ted Jacobson Due...

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Unformatted text preview: HW#7 Phys374Spring 2007 Prof. Ted Jacobson Due before class, Friday, March 30, 2007 Room 4115, (301)405-6020 www.physics.umd.edu/grt/taj/374b/ jacobson@physics.umd.edu 1. Gravity waves on water supplement, Exercise b . This involves showing that the in- dividual bits of water move in ellipses whose size and ellipticity depend upon the depth. [10+2+1+2=15 pts.] 2. Problems 11.5a,b,c,d,e,f,g,h,i ( Explosion of a nuclear bomb ) Note : When Snieder says at the beginning of this section that the neutron current is given by (11.29), he means that it is given by analogy with this equation. Hints : (b) If a function of only t is equal to a function of only r , then the two functions must both be constant. The value of this common constant is what is called in the book the separation constant. (e) The neutron density is finite at r = 0, and it goes to zero at r = R , since once the neutrons reach the surface they quickly fly off. (i) Justify your answer. [1+3+1+2+2+2+1+2+1=15 pts.] 3. Problem 12.2f (3....
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