Answer:
is it 20kg. Two opposing forces pushing onto each other
Answer:

Explanation:
From the question we are told that:
Pressure of 
Bottle cap area 
Generally the equation for Resultant pressure
is give as is mathematically given by

Where



Generally the equation for Force exerted by screw F is give as is mathematically given by


Answer:
I think c is the answer but I have a little concern on d too
<span>The primary gases of the atmosphere are _____:
</span>
nitrogen, oxygen, and carbondioxide