MPB 8115 Lecture 25: phys 12C intestinal motility and absorption

<p>Nuclear fission reaction summary:<br />235&#160;&#160;&#160;&#160; 1<br />92 U + 0 n &#8594;unknown nucleus A (Equation 1)<br /><br />unknown nucleus A &#8594;90 38 Sr + unknown nucleus B + 3 1 n (Equation 2)<br />&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; 0<br />(i)<br />Find the mass number and atomic number for the unknown nuclei A and B and identify them. Comprehensive explaination needed<br />(ii)<br />Under certain circumstances this process may generate a self-sustaining chain reaction. fully describe what 3 conditions need to be satisfied for this to occur. <br /><br />(b) 225.9771 g of 226 86Rn decays to form 221.9703 g of 222 86 Rn and 4.0015 g<br />of 42He .<br />(i)<br />How much energy is released in this reaction?<br />(ii)<br />For how many years would the energy released power a 12 W light bulb?<br />Any help would be greatly appreciated.</p>

<p>Assume thatx(t)=b9cos(&#969;_ot)+u(t) is a solutionof the vander Pol Equation 4.19. Assume that the dampingparameter&#160;&#956; is small and keep terms in u(t) tofirst order in &#956;. Show that b= -2a and u(t)=-(&#956;a³/4&#969;_o)sin(3&#969;_ot)is a solution. Produce a phase diagram of x' vs x and produce plotsof x(t) and x'(t) for values of a=1,&#969;_o=1, and&#956;=0.05.</p>
<p>equation 4.19</p>
<p>x''+&#956;(x²-a²)x'+&#969;_o²x=0</p>

<p>A small helium-neonlaser emits red visible light with apower of 2.60 mW in a beam that has a diameter of 2.90 mm.<br/><br />*I found the amplitude of the electric field ofthe light, E = 790 V/m<br />*I also found the amplitude ofthe magnetic field of the light, B = 2.63&#956;T</p>
<p><br />Part C<br />What is the average energydensity associated with the electric field?<br /> u =&#160; &#160; &#160; &#160; J/m^3</p>
<p>&#160;</p>
<p>Part D</p>
<p>What is the average energy density associated with themagnetic field?</p>
<p>u = &#160; &#160; &#160; &#160; &#160;J/m^3</p>
<p>&#160;</p>
<p>A brief explanation and steps would be awesome,thanks!!</p>