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Therefore, during space flight, astronauts on board the Flying Disc would feel as if they are standing on the Earth’s surface. This will give you the distance from the datum to the center of gravity of the object. A type II black hole (supermassive) may have a core a few tens of meters accross, well within its event horizon. P8.72 248 *P8.73 Potential Energy (a) At the top of the loop the car and riders are in free fall: ∑ Fy = ma y: mg down = v = Rg mv 2 down R Energy of the car-riders-Earth system is conserved between release and top of loop: K i + U gi = K f + U gf: 0 + mgh = a f 1 mv 2 + mg 2 R 2 a f 1 Rg + g 2 R 2 h = 2.50 R gh = (b) Let h now represent the height ≥ 2.5 R of the release point.
