GGRB28H3 Chapter : GEOGRAPHIES OF TUBERCULOSIS.docx

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coralmuskrat875

16 Apr 2012

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The association of housing density, isolation and tuberculosis in canadian. Michael clark, a peter ribena and earl nowgesicb. First nation communities experience high levels of overcrowded housing, degree of isolation and rates of tuberculosis (tb). The purpose of this study was to examine the association between community housing density, isolation the incidence and occurrence of tb in canadian first nations communities. Tb incidence is higher in communities located in isolated areas, and in communities with higher average housing densities. It is possible that communities with such cases experienced higher transmission rates and were more likely to be influenced by factors such as overcrowded housing. It is also possible that people in non isolated communities are more likely to move to the reserves and break down the disease to the isolated places where they do not provide such services. Overcrowded living conditions and isolations from health services are associated with an increased risk of developing tb.

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A blue green laser is being tested as an experimental aircraft to submerged submarine communication systems. Given the laser operates at a wavelength of 490 nm and is incident at an angle of 30.0 degrees to the normal to the ocean surface, and if the index of refraction in seawater is 1.33, a) if the submarine is at a submerged postion at an angle of 20 degrees to the normal to the ocean surface and in the same plane with respect to the aircraft can communication be established knowing the laser beam is very narrow (<1 degree)? b) What is the refracted wavelength? c) what is the speed of the laser beam in seawater? d) what is the frequency of this laser transmitted by the aircraft? e)if the communication receiver on the submarine is tuned to this frequency given it is in the beam, will it receive these laser signals?

Every transparent material can be characterized by what is called its index of refraction, n, given by the equation

$Chapter 9, Problem 4C, Every transparent material can be characterized by what is called its index of refraction, n, given , example 1$

Here c is the speed of light in a vacuum and v is the speed of light in the transparent material. Although normal air is not quite a vacuum, its density is small enough that v_a_i_ris approximately equal to c, so that we may take $Chapter 9, Problem 4C, Every transparent material can be characterized by what is called its index of refraction, n, given , example 2$ without too much error.
The precise mathematical relationship between the angles of incidence and refraction is given by what is known as Snell’s law,

$Chapter 9, Problem 4C, Every transparent material can be characterized by what is called its index of refraction, n, given , example 3$
where n₁and A₁are the index of refraction and the angle between the light ray and the normal, respectively, in medium 1, and n₂and A₂are the corresponding quantities for medium 2.

(a) Using the information in Table 9.1, compute the index of refraction for water and for fused silica (glass).
(b) Verify the result in Example 9.2 using Snell’s law explicitly. Show, using the same relationship, that the values for the angles of refraction in air (medium 2) in panels (b), (c), (d), and (e) of Figure 9.36 are correct for the given angles of incidence in glass (medium 1).

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<p>Robert recently watched a documentary on the Fairchild-Republic A-10 Thunderbolt II (‘Warthog’). This single-seat close air support aircraft is entirely designed around a seven-barrel 30mm GAU-8/A Avenger Gatling gun that fires 3900 rounds (bullets) per minute with a muzzle velocity of approximately 3250 ft/s to engage armored targets (especially tanks) at distances approaching two miles. Aluminum jacketed combat ammunition loads use a 4 to 1 ratio of depleted uranium (DU) armor-piercing incendiary (API) and high-explosive incendiary (HEI); rounds are typically 11.4 in long and mass 1.53+ lb. The rated accuracy specifies 80% of the fired rounds impact within a 20ft radius circle 4000ft downrange, with a drop of 10ft. Due to the enormous recoil of this gun (and to conserve ammunition), pilots typically fire the cannon in 2.00s bursts. Using SI units, calculate the engine thrust necessary to maintain constant airspeed during the interval when the cannon fires. Assume the plane is in level flight and that 56% of the mass of each round is the projectile (each API projectile contains a 0.66lb DU sabot in a Ti-Al jacket)<br /><br />Note: All momentum analyses must begin with a FBD*, include an isolation test, and utilize the law of momentum conservation.</p>

GGRB28H3 Chapter : GEOGRAPHIES OF TUBERCULOSIS.docx

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