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Answers on questions: Physics
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Ответ:
To cause disease, a pathogen must successfully achieve four steps or stages of pathogenesis: exposure (contact), adhesion (colonization), invasion, and infection.
Explanation:
Ответ:
a)
b)
Explanation:
Complete question statement is as follows :
A wooden block of mass M resting on a friction less, horizontal surface is attached to a rigid rod of length ℓ and of negligible mass. The rod is pivoted at the other end. A bullet of mass m traveling parallel to the horizontal surface and perpendicular to the rod with speed v hits the block and becomes embedded in it.
(a) What is the angular momentum of the bullet–block system about a vertical axis through the pivot? (Use any variable or symbol stated above as necessary.)
(b) What fraction of the original kinetic energy of the bullet is converted into internal energy in the system during the collision? (Use any variable or symbol stated above as necessary.)
a)
Angular momentum of the bullet-block system is given as
b)
Using conservation of momentum
Angular momentum of bullet block combination = Angular momentum of bullet
Initial kinetic energy of the bullet is given as
Final kinetic energy of bullet block combination is given as
Fraction of original kinetic energylost is given as
Fraction =![\frac{(K_{o} - K_{f})}{K_{o}} = \frac{((0.5) m v^{2} - (0.5) (M + m) V^{2})}{(0.5) m v^{2}}](/tpl/images/0401/4931/95b0a.png)
Fraction =![\frac{(m v^{2} - (M + m) (\frac{mv}{(M + m)})^{2})}{m v^{2}} = \frac{(Mm v^{2} + m^{2} v^{2} - m^{2} v^{2})}{(M + m) m v^{2}}](/tpl/images/0401/4931/70b09.png)
Fraction =![\frac{(Mm v^{2} + m^{2} v^{2} - m^{2} v^{2})}{(M + m) m v^{2}}\\ \frac{M }{(M + m)}](/tpl/images/0401/4931/12c0a.png)