Sorry if this has been answered before (looked through several pages, don't see the answer):
What is the exact extent of ATC primary radar coverage of the Gulf of Thailand?
If the transponder of MH370 was turned off or otherwise disabled at the last known position, 40 min after takeoff, but the aircraft itself remained in one piece at that point, would the aircraft still be visible on any radar afterwards?
Based on available information, is it possible that MH370 had a massive electrical failure and/or was hijacked 40 min after takeoff and eventually was ditched into the ocean, say, in South China Sea halfway between Vietnam and Philippines (1000 miles from the last known position), thus explaining why no one saw an explosion and no one seems to be able to find any debris?
P.S. And while we're at it, how far would a 777 glide if (worst case scenario) a power failure shut down all electronics and all engines at the altitude of 35000 ft and airspeed of 470 knots?