That depends on whether a runner is forced to vacate a base when a ground ball is hit. If there is a runner on first base and a ground ball is hit, the runner is forced to run to second base because the batter is running to first base. If there is also a runner on second base, that runner is forced to run to third because the runner from first is running to second. If a runner is not forced to run, they do not have to. If there are runners on first base and third base and a ground ball is hit, the runner at first is forced to run to second because the batter is running to first. But the runner on third is not forced to run because no runner is running to third base from second base.
Advancing on a passed ball does not count as a stolen base unless runner was already in the act of stealing the base, in that case it is a stolen base.
Assuming you mean a batted ball? The answer depends on where the runner on third is standing. If the runner is standing in foul territory, it is ruled a foul ball. If the runner is touching third base or leading off in fair territory and the ball hits him, then he is ruled out and the ball is dead. It is recorded as a putout by the third baseman. The batter is awarded first base, and other runners forced to advance will do so, so the runner on first is awarded second base, and the runner on second is awarded third base. If the infield-fly rule is in effect and the ball hits the runner on third, he is safe and the batter is out, provided the runner is touching third base. A runner on third should always lead off in foul territory to avoid these situations which would rule him out.
As soon as the runner touches home plate, the run scores. The following runner has the right to third base. Either the base coach or the following runner on third base should tell the runner who scored that it was not a foul ball and he should go to the dugout. The ball is still live.
No. Has to be appealed and ruled out by the umpire.
Runner stays on second base if he is smart. That is a 5 to 3 out.
When the ball is in play, a base runner can always ATTEMPT to advance to the next base. He is allowed to advance to next base if the ball was badly thrown during an attempted steal of an earlier base. Note that, if the outfielder throws the ball to third base and the third baseman tags the runner before he gets to third base, the runner is out -- just like any other attempt to "steal" a base.
Yes it is considered a sacrifice.
The runner only has to run if there is another runner behind him (bases loaded) or if there is a force at secoind base.
yes he can do it