**Name: Sec.# ( 8) ---Quiz ( 1)-Ch(1) S.N:**

ID : Phys 101 ( Term 041)-( *F. Enaya*)

*Show your steps
clearly for full credit.!!*

__Q.1__**:** The final velocity of a drop of water falling
through the atmosphere is given by: v = (2/9)(r^{2} g ρ/ n) where
v is the velocity of the drop in m/s; r is the radius in m; g is the
acceleration due the gravity in m/s^{2}; and ρ is the density of
the water in kg/m^{3}. What must be the unit of n, the coefficient of
the velocity of the air which the drop falls?

In units :

n
= ( r^{2} g r )/ v = (m^{2
}. m . kg/m^{3})/(m/s) =
(kg/s . m )

__Q.2__**: **Speed
of the sound is 340 m/s. Express this in mile per hour. ( 1 mile = 1609 m)

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