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Horizontal and Vertical Components of Projectile Motion

80-What is co...

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80-What is concept of Apogee and Perigee in ravitation find ratio of their kinetic energy.

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Q. A planet is revolving round the sun. Its distance from the sun at Apogee is

r_{A}

and that at Perigee is

r_{P}

. The masses of planet and sun are

m

M

v_{A}

is the velocity of planet at Apogee and

v_{P}

is at Perigee respectively and

T

is the time period of revolution of planet round the sun, then identify the wrong answer.

Q. A planet revolves around the sun in an elliptical orbit. If

v_{p}

v_{a}

are the velocities of the planet at the perigee and apogee respectively, then the eccentricity of elliptical orbit is given by :

Q. In elliptical orbit of a planet, as the planet moves from apogee position to perigee position.

Column-I	Column-II
(a) speed of planet	(p) remains same
(b) distance of planet from centre of sun	(q) decreases
(c) potential energy	(r) increases
(d) angular momentum about centre of sun	(s) can not say

Q. For a particle projected in a transverse direction from a height h above earth's surface, find the minimum initial velocity so that it just grazes the surface of earth such that path of this particle would be an ellipse with centre of earth as the farther focus, point of projection as the apogee and a diametrically opposite point on earth's surface as perigee.

Q. Two bodies Of masses

2 m

m

have their kinetic energies in the ratio

8 : 1

. What is the ratio of their momenta?

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