The de Havilland D.H.9A by Peter Cooksley, Joe Sewell, Don Greer

By Peter Cooksley, Joe Sewell, Don Greer

A seat, quickly bomber that entered provider with the Royal Flying Corps in the course of 1918. persisted in provider way past the tip of WW I in a few roles. a hundred images, thirteen colour work, a variety of line drawings. 50 pages.

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F, are reported in Fig. 5. The quoted Tables show that: i) For b* = 0 and any value of g *2 we always have = n. This is typical of a “head on collision” in which the incoming particle is back reflected along the rn axis (see Fig. 5a); ii) The value b*,for which is = 0 increases when g* is decreased (see Fig. 4); iii) For 0 < b* < b*,the angle monotonically decreases from 7c to 0 for increasing b *. This is verified for all values of g * 2 . The trajectories corresponding to the values ~ ( b ) , ~ ( c ) , of ~ ( x(see d ) Fig.

12). n(2,2) for the potential (1 2-6). 12 Effusive Sources Let us now consider a container filled with a perfect gas in thermal equilibrium and an element of the container wall. Be A the area of such an element. We want to calculate the frequency of molecular collisions on such an element. We will start by assuming the element to be centred on the origin 0 of a Cartesian coordinates system O(x, y , z), and lying on the plane z = 0 of such a system (see Fig. 1). Gas Properties 31 Fig. 1 Geometry used for the calculation of the frequency of molecular collisions on the element of area A of the container wall.

From Eq. 2) we can infer the number of molecules which have a velocity magnitude in (v,v+dv). e. to assume d3v = v2dvsinOdOdy,, and then to integrate over all the directions. We have (Maxwellian distribution) 3 _- mu2 dn(V) = N f (v) dV = 4M(- m ) 2- e 2KBT u’&. 3) ~ZKBT We now want to observe that, for the gas in equilibrium, we have [ 141 = vf (W3V j f( W 3 v = 0. 4) Indeed, the function f(v) is, with respect to the substitution v -+ -v, an even function depending only on lvI2, while v f ( v ) is an odd function.

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