Physics A2...circular motion?

[earthling]

What happens to the speed of the satellite when it moves to an orbit that is closer to the earth?
i.e. it's radius is decreased?

 

[Mustehssun Iqbal]

speed decreases. v = rw
when w is constant, and r is decreased, v decreases.

 

[Mustehssun Iqbal]

w = 2( pi )/ T ;
so w is independent on r. so w is constant. Thus v is directly proportional to r.

 

[Mustehssun Iqbal]

no sorry,
v = square root of GM/r
so when r decreases, v increases?? pls confirm it :/

 

[Mustehssun Iqbal]

w omega also changes when r is decreased . Suppose there is a larger orbit than another one... Obviously , the planet with larger radius takes more time to complete one revolution around the sun.
The first equation I quoted isn't going to be used in this case... w is not constant...
v= rw;
Hence w = v/r
so equation 2 is used...
Oh yes, there's Kepler's third law too:
T square is directly proportional to r cube.
so T increases with increasing value of r, and thus w changes with it too.
Thus w is not constant and second equation , v = square root of GM/r is used.
Someone pls confirm it

 

[earthling]

I suppose u were right about ....
v = square root of GM/r
so when r decreases, v increases?? pls confirm it :/

So...they are inveresely proportional.