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A: 2 concrete blocks 6cm apart will have the least gravitational attraction to each other.
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<span>The outermost energy level of an element are called the valence shell, that holds the valence electrons. they consist of the highest energy level. In aluminum, the valence electrons are 3. </span>
The absolute pressure is given by the equation,
Here, 
is absolute pressure,
is atmospheric pressure and 
is vacuum pressure.
Therefore,
The gage pressure is given by the equation,
.
Thus,
.
In kn/m^2,
The absolute pressure,
The gage pressure,
.
In lbf/in2
The absolute pressure,
The gage pressure,
In psi,
The absolute pressure,
.
The gage pressure,
In mm Hg
The absolute pressure,
The gage pressure,
a) earth acts as a lange magnetic. Therefore when a magnet is hanging freely, it points towards the magnetic poles (like a compass)
b) like poles repel and unlike poles attracts. We can conclude with repulsion that poles are same
c) In our everyday experience aluminum doesn't stick to magnets. (under normal circumstances aluminum isn't visibly magnetic)
