Answer:
c20800
Explanation:
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I dont know what the statements are but concave lens are thinner in the middle which cause light to diverge or scatter
a substance's density is the same at a certain pressure and temperature, and the density of one substance is usually different than another substance.
<u>Mechanics</u> is the branch of physics which deals with the study of motion of material objects.
<u><em>Divisions</em></u>
There are three major division of mechanics
Statics
Kinematics
Dynamics.
density of water = 
velocity of flow = 
radius of pipe = 
Height of second floor = 
Now we can use here Bernuoli's Equation to find the speed of water flow at second floor



Now in order to find the radius of pipe we can use equation of continuity



So radius of pipe at second floor is 0.034 meter