Answer:
27.35m
Explanation:
For the calculation of the Support Force we rely on the formula for obtaining the force in a cylinder of a certain length l,
Here each term is,
= Lift force
= density of air
= vortex strength
For this last equation, its mathematical representation is given by,
Here each term is,
a= 1m, radios of cylinder
, the velocity of cylinder surface.
In order to find the density of the area at 2000m we will refer to the table of Standard Atmosphere of the United States, that is 
Replacing the values,
Clearing l and solving for it we have,
<em>In this way we can conclude that the length of the cylinder must be 27.35m</em>
Average velocity is calculated as the division of displacement and change in time so the answer would be 804 km/36000 s=0.02 m/s
Answer:
Cy and Di
Explanation:
We cannot tell exactly where the right end of the mirror is, but if we assume it is short of allowing Ed and Fred to see each other, we have the following:
Cy can see Cy and everyone to the right
Fred can see Di and everyone to the left
The only two that can see all of Cy, Di, Ed, and Fred are Cy and Di.
_____
If the mirror extends far enough to the right for Ed to see Fred, then all of Cy, Di, and Ed can see the four folks of interest.
Answer:
It will be more than deta t
Explanation:
Because
deta t' = န deta t
But န= 1/√ (1 - v²/c²
So the observers in all the initial frames will be more than deta t
