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Its not really definable. Say, you can have a full moon on the last day of November, and have the waning phases throughout the first half. Or you can have a new moon on the last day of December, and have the waxing phases during the first half of the month.
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They can continue moving without the need of an external force
Explanation:
Newton's first law of motion states that:
"An object in motion at constant velocity (or at rest) will continue moving at constant velocity (or will stay at rest) unless acted upon an external force"
In normal daily life, we normally experience something different: when we throw an object on a table, for instance, we notice that the object will eventually stop, instead of keep moving. This is because there is another force acting on the object, the force of friction, opposite to the motion, that "resists" the motion of the object eventually bringing it to a stop.
In space, however, there is no force of friction or air resistance. Therefore, Newton's first law can be applied: and so, if space travellers are in a ship, and this ship is moving at a certain constant velocity, it will keep moving at this velocity without slowing down, and no external force would be needed in order to keep the ship in motion.
Learn more about Newton laws of motion:
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5.
explanation: the answer is 5
Answer:
Physical Properties of Sodium
Atomic number 11
Melting point 97.82°C (208.1°F)
Boiling point 881.4°C (1618°F)
Volume increase on melting 2.70%
Latent heat of fusion 27.0 cal/g
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Home Periodic table Elements Sodium
Sodium - Na
Chemical properties of sodium - Health effects of sodium - Environmental effects of sodium
Atomic number
11
Atomic mass
22.98977 g.mol -1
Electronegativity according to Pauling
0.9
Density
0.97 g.cm -3 at 20 °C
Melting point
97.5 °C
Boiling point
883 °C
Vanderwaals radius
0.196 nm
Ionic radius
0.095 (+1) nm
Isotopes
3
Electronic shell
[Ne] 3s1
Energy of first ionisation
495.7 kJ.mol -1
