if we say speed of a satellite in velocity. velocity is displacement by time . so how we can say an object speed in velocity
Answers
Answer:
Speed is a physical quantity because it involves only magnitude.
But velocity is a vector which involves the direction also. So if there is any change in direction of object while in motion we'll consider the velocity.
Answer:
Let r=radius of satellite.
v
0
= the orbital speed of a satellite.
v
e
= escape velocity of a particle on earth's surface
v= velocity of satellite at which it strike the surface of the earth
M= mass of earth
m= mass of satellite
The orbital speed of a satellite is given by
v
0
2
=
r
GM
. . . . .(1)
Escape velocity of a particle on the earth surface
v
e
2
=
R
2GM
. . . . .(2)
Applying law of conservation of energy at point A and B,
K.E= change in potential energy
2
1
mv
2
=−
r
GMm
−(
R
GMm
)
v
2
=
R
2GM
−
r
2Gm
v
2
=v
e
2
−2v
0
2
(from equation 1 and 2)
v=
v
e
2
−2v
0
2
