The inner core us the densest
Answer: D. gravity
Explanation:
An airplane in flight is acted on by four forces: lift, the upward acting force; gravity, the downward acting force; thrust, the forward acting force; and drag, the backward acting force (also called wind resistance).
Answer:
The new pressure becomes one third of the initial pressure.
Explanation:
The relation between pressure and volume at constant temperature is given by :

Let new pressure and volume be P' and V' respectively.
V'=3V (given)
So,

Hence, new pressure becomes one third of the initial pressure.
The molar mass constant is used to convert mass to moles
Answer:
It depends on the identity of the outer atom
Explanation:
We must recall that the polarity of a molecule depends on difference In electronegativity between atoms as well as the shape of the molecule.
When a central atom has no lone pairs and all the groups in the molecule are bonding, the identity and arrangement of the outer atoms will determine the polarity of the molecule.
A polar molecule is formed by certain types of outer atoms arranged in certain ways around the periodic table and vice versa.