49
7 x 6 x 5 x 4 x 3 x 2 x 1
Basically, the runners start as a crowd, not as individuals in lanes with starting blocks. Everybody lines up at the start, and they are all released at once.
The stagger is done so that everyone runs the same distance. The runners that start on the inside lanes start farther back, because the outside lanes are longer. This way everyone runs the same distance no matter which lane they are assigned.
All runners are assigned a number at the start of the race. When a runner passes a checkpoint the number is checked on a list. This way the runners don't have to stop to put their names down.
The track length is longer for the outer lanes. The starting blocks are staggered so that each runner has an equal distance to the finish line. They have to remain in their respective lanes because of the position where they started, to make it fair to all runners.
not quite sure what you're asking here... if you're asking if they curve the starting line, then the answer is that it depends on the race most individual distance (600m+ in most cases) events start on what's called a 'waterfall line'. This line is a progressively curved line intended to compensate for the added distance of running in the outside lanes. As soon as the gun goes off, the runners fight for position in the innermost lane. For almost every sprinting event (less the 55, 55h, 100, 110hh) and some relays, runners begin in a 'staggered' position, in which each lane has its own starting line, again to compensate for added distance in the outer lanes. These lines are not curved, though the 'break line', a line that may or may not be used (depending on the race and meet) to signify when a runner can 'break' out of his or her assigned lane and move to lane 1 without penalty, is sometimes used in a race and is curved in the opposite direction (away from runners in outer lanes).
It all depends on who is running the meet, how many lanes there are in the pool, and if it is a qualifying meet. Usually, for a finals meet for any big event there are 4-5 officials circling the far side of the pool, 3 in the sides of the pool, and one official on the starts/finishes side of the pool.
Cheating.
Due to the curved/circular path of the track, the diameter is longer with each lane that moves outwards. Runners start at intervals for the 400 meter dash so that all runners end up running 400 meters in the end and not more or less.
There are a few ways to space runners on a track. You could have a staggered start where there is one runner per lane and they each start a but higher then the next (due to which lane they are in). They could also all start on the waterfall (the curved start line).
Runners 1 and 3 are at the start, runners 2 and 4 are half-way (100 metres) along the track. They finish at the start.
The stagger in the 400 meter dash are the different starting points around the first curve that each runner lines up on. Because the track is oval, having everyone start at the same line would be unfair to those running in the lanes outside of lane 1. Basically, the further out you would start, the further you would have to run. for example, By having the starting point for each lane start futher up ,or staggered, around the first turn ensures that all the runners are running the same distance.