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Assertion: Generally the path of project...

Assertion: Generally the path of projectile form the earth is parabolic but it is elliptical for projection going to a very large height.
Reason: The path of projectile is independent of the gravitational force of earth.

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Upto ordinary heights, the change in the distance of a projectile from the centre of the Earth is negligible small, as compared to the radius of the Earth. Due to it, the projectile moves under a uniform gravitational force and its path is parabolic, the gravitational force decrease, which is inversely proportinal to the square of the distance of the projectile from the centre of the Earth. Under such a variable force, the path of projectile is elliptical.
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Assertion : Generally the path of a projectile from the earth is parabolic but it is elliptical for projectiles going to very great height. Reason : Up to ordinary height the projectile moves under a uniform gravitational force, but for great heights, projectile moves under a variable force.

For ordinary heights, the path of a projectile is parabolic but for great heights the path is elliptical. Explain.

The question given below consist of an assertion and the reason . Use the following key to choose appropriate answer: Assertion : When path of one projectile is observed with respect to another projectile, then it is a straight line . Reason : Both the projectiles are moving with the same acceleration , hence acceleration of one with respect to the other is zero .

What is a projectile ? Give its examples. How that the path of projectile is a parabolic path when projected horizontally from a certain height.

Assertion: The height attained by a projectile is twenty five percentage of range, when projected for maximum range. Reason: The height is independent of initial velocity of projetile.

Assertion: A person sitting in an artificial satellite revolving around the earth feels weightless. Reason: There is no gravitational force on the satellite.

A projectile is to be launched from the surface of the earth so as to escape the solar system. Consider the gravitational force on the projectile due to the earth and the sun nly. The projectile is projected perpendicular to the radius vector of the earth relative to the centre of the sun in the direction of motion of the earth. Find the minimum speed of projection relative to the earth so that the projectile escapes out of the solar system. Neglect rotation of the earth. mass if the sum M_(s)2xx10^(30)kg, Mass of the earth M_(e)=6.4xx10^(24)kg Radius if the earth R_(e)=6.4xx10^(6)m, Earth- Sun distence r=1.5xx10^(11)m

Assertion: For projection angle tan^(-1)(4) , the horizontal range and the maximum height of a projectile are equal. Reason: The maximum range of projectile is directely proportional to square of velocity and inversely proportional to acceleration due to gravity.

Assertion : A satellite can not be set on a stable orbit in a planet not passing through the earth's centre. Reason: For the orbital motion of satellite, the centripetal force is provided by gravitational pull of earth on satellite.

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