It is probably gas as pure water starts boiling at 100d degrees C
Newton's second law of motion states that
D. the force acting on a body equals the rate of change of momentum
Explanation:
Newton's second law of motion states that the force acting on a body is equal to the product between the mass of the body and its acceleration. Mathematically:
where
F is the force
m is the mass
a is the acceleration
We can re-write the acceleration as the rate of change of the velocity:
So we can re-write the equation as
However, the term represents the change in momentum of the body, (assuming its mass to be constant). Therefore, we can further rewrite the equation as
which means that the force acting on a body equals the rate of change of momentum (option D).
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Explanation:
RA-Dec (Right Ascension and Declination) system is a coordinate system to locate an object on the celestial sphere. It should be noted that RA-Dec of a star or a celestial object remains same for the observer all over the world. This grid is very similar to the grid on the Earth i.e. Longitude - latitude system. One can consider the RA-Dec grid like we extended the long-lat grid and pasted it on the celestial sphere.
Similarities:
1. They both are global and do not change with change in observer's location.
2. Just like equator is reference for latitude, celestial equator is reference for declination.
3. Declination circles are parallel to celestial equator just like latitude circles are parallel to equator.
4. RA lines drawn from north celestial pole to south celestial pole just like longitudinal lines run from north pole to south pole.
Answer:
It takes a longer period for the ball to fall down again.
Explanation:
When considering the drag force of the air, the period of fall of the ball would take longer than the period of rise.