A loon is a diving bird equally at home "flying" in the air or water. What swimming velocity under water will produce a dynamic pressure equal to that when it flies in the air at 35 mph?
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Ответ:
The swimming velocity under water is 1.23 mph
Explanation:
dynamic pressure![= \frac{\rho v^2}{2}](/tpl/images/0514/0225/ba5e5.png)
where;
ρ is density of the fluid
v is the velocity of the fluid
ρw is the density of water = 1.94 slug/ft³
ρa is the density of air = 0.00238 slug/ft³
given velocity of air in mph = 35 mph, converting to ft/s is as follows
From this equation
, we determine the swimming velocity under water.
in mph;![1.798\frac{ft}{s} (\frac{1 .mile}{5280.ft})(\frac{3600.s}{1.hour}) =1.23 mph](/tpl/images/0514/0225/2f9b5.png)
Therefore, the swimming velocity of the loon under water that will produce a dynamic pressure equal to that when it flies in the air is 1.23 mph
Ответ:
EL ZINC ES EL ELEMENTO PURO PORQUE NO HA REACCIONADO CON NINGÚN OTRO METAL O NO METAL. EL SULFURO DE ZINC ES UN COMPUESTO PORQUE HA REACCIONADO CON EL AZUFRE PARA HACER EL COMPUESTO.
english:
ZINC IS THE PURE ELEMENT BECAUSE IT HAS NOT REACTED WITH ANY OF OTHER METAL OR NONMETAL. ZINC SULPHIDE IS A COMPOUND BECAUSE IT HAS REACTED WITH SULPHUR TO MAKE COMPOUND.