Answer:

Explanation:
Approximately, we can use the ideal gas law, below we see how we can deduce the density from general gas equation. To do this, remember that the number of moles n is equal to
, where m is the mass and M the molar mass of the gas, and the density is
.
For air
and 
So, 

Answer:
600 mpa
Explanation:
It's smart for a equation then you reperfuce
Answer:50 , 20
Explanation:
Given
Diametrical Pitch
where T= no of teeths
D=diameter
module(m) of gears must be same

Let
be the gears on two gears
Therefore Center distance is given by

thus


and Velocity ratio is given by


From 1 & 2 we get
