Understanding the Relationship of n=Sine i/Sin r for Waves and Light Homework

raman911
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Homework Statement




http://img103.imageshack.us/img103/7336/12345va5.png




The Attempt at a Solution



n= Sine i/Sin r
n= Sin 3o/Sin15
n=1.93
Is That Right
 
Last edited by a moderator:
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any one help me
 
Yes that is correct.
 
It seems ok to me.
 
yep, correct
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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