Explanation
The system will be bound at points where total energy is negative. In the given curve at point , B and C the P.E. is more than K.E.
Because gravitational force is always attractive in nature and everybody is bound by this gravitational force of attraction of earth.
As no torque is acting on the planet, its angular momentum must remain constant in magnitude as well as direction. Therefore, plane of rotation must pass through the centre of earth.
According to Kepler’s law of planetary motion, a planet revolves around the sun in such a way that its areal velocity is constant, i.e., it move faster, when it is closer the sun and vice-versa.
As the geostationary satellite is established in an orbit in the plane of the equator at a particular place, so it move in the same sense as the earth and hence its time period of revolution is equal to 24 hours, which is equal to time period of revolution of earth about its axis.
Upto ordinary heights, the change in the distance of a projectile from the centre of earth is negligible compared to the radius of earth. Hence, the projectile moves under a nearly uniform gravitational force and the path is parabolic. But for the projectiles moving to a large height, the gravitational force decreases quite decreasing variable force, the path of the projectile becomes elliptical.
We know that earth revolves from west to east about its polar axis. Therefore, all the particles on the earth have velocity from West to East.
This velocity is maximum in the equatorial line, as v = Rω, where R is the radius of earth and ω is the angular velocity of revolution of earth about its polar axis.
When a rocket is launched from west to east in equatorial plane, the maximum linear velocity is added to the launching velocity of the rocket, due to which launching becomes easier.
Due to inertia of direction
Gravitational force does not depend on the medium.
Actually gravitational force provides the centripetal force.
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