Fill in the blanks and explain the statements with reasoning:

a. If the height of the orbit of a satellite from the earth surface is increased, the tangential velocity of the satellite will …

b. The initial velocity (during launching) of the Mangalyaan, must be greater than …………..of the earth.

Answer:

(a) If the height of the orbit of a satellite from the earth surface is increased, the tangential velocity of the satellite will __decreases__.

__Explanation__: As tangential velocity of satellite is inversely proportional to the height of orbit of satellite from earth’s surface.

V= √

Where V = tangential velocity

G = gravitational constant

M = mass of earth

R = radius of earth

h = height of satellite above earth surface

(b) The initial velocity (during launching) of the Mangalyaan, must be greater than __escape velocity__ of the earth.

__Explanation__: Spacecrafts should escape the earth’s gravitational force to travel to outer space. Escape velocity is the minimum speed required by an object i.e. satellite to escape from the gravitational force of the earth. The minimum velocity of satellite should be 11.2 km/sec.