Good point.....like the Malaysian plane would've been so important as to cause it to be the focus of satellite imagery before it disappeared?
All the planes are moving. The satellite is moving. The plane in question had its communication turned off.
To answer that question, you would have to think of the satellite as a computer and what its functions are as well as what kind of satellite it is. I have no clue as to its capabilities.
It depends on how sophisticated the satellite is, how old it is and how well functioning it is.
It is hard to say if these satellites have artificial intelligence but what is the bandwidth on these things? Is it busy routing telephone calls or television broadcasts and too busy with these things? I'm sure it is able to zoom in on images but what would you see? You would see an object and it would depend whether or not if it is focused on the object or not. If you saw a plane, what would it look like? It would look like a plane. With the communications gear turned off, would the satellite know which plane it was? Would the satellite be in range? It was trying to do a handshake and re-establish communications with the plane so with communications turned off, what do you know?
Does a satellite have radar?
These answers are more likely secret and you will never know because no one wants you to know.