Mechanics (Part – 3)

Kepler formulated three fundamental laws that describe the motion of planets around the Sun:

1. Kepler's First Law (Law of Ellipses) – Planets move in elliptical orbits with the Sun at one focus.
2. Kepler's Second Law (Law of Equal Areas) – A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.
3. Kepler's Third Law (Law of Harmonies) – The square of a planet’s orbital period is proportional to the cube of the semi-major axis of its orbit.

Kepler formulated three fundamental laws that describe the motion of planets around the Sun:

1. Kepler's First Law (Law of Ellipses) – Planets move in elliptical orbits with the Sun at one focus.
2. Kepler's Second Law (Law of Equal Areas) – A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.
3. Kepler's Third Law (Law of Harmonies) – The square of a planet’s orbital period is proportional to the cube of the semi-major axis of its orbit.

Kepler formulated three fundamental laws that describe the motion of planets around the Sun:

1. Kepler's First Law (Law of Ellipses) – Planets move in elliptical orbits with the Sun at one focus.
2. Kepler's Second Law (Law of Equal Areas) – A line joining a planet and the Sun sweeps out equal areas during equal intervals of time.
3. Kepler's Third Law (Law of Harmonies) – The square of a planet’s orbital period is proportional to the cube of the semi-major axis of its orbit.

According to this, each planet revolves around the Sun in an elliptical orbit and the Sun lies at one focus of this ellipse.

• The greatest magnitude of the force on a rotating object is in the moment.
• Its S.I unit is the newton meter.

• Blotting paper is made of loosely packed cellulose fibers, creating a network of tiny pores or capillaries.
• When ink comes into contact with the paper, capillary action pulls the liquid into these pores.
• This occurs due to the adhesive force between the ink and the paper fibers being stronger than the cohesive forces within the ink itself.
• As a result, the ink gets drawn into the paper, spreading quickly and being absorbed without the need for pressure. Capillary action is the key process behind the ink absorption in blotting paper.

Since the reaction force by the surface of a spaceship is zero, so the body will experience weightlessness.

This happens in the zero-gravity region.

This force:

• Acts between any two masses,
• Is always attractive,
• Is responsible for keeping us grounded on Earth,
• And is what causes objects to fall when dropped. So the Earth's gravitational force is what keeps the atmosphere around us, the Moon in orbit, and satellites circling the planet.

Hence option (a) is correct

g = (Gm)/((R + h)²)

Here 'h' is the height of the object from the surface of the planet.

So it is clear that the value of g will decrease as h increases.