There are several reasons. First, time constraints. Teams have to move between tracks in a week and usually do not go back to their shops between tracks. It is not convenient for the teams to do so either. Also, drivers have little time to get to the next track and test a car - sometimes as little as 2 days. Making major changes to a vehicle isn't practical. Teams run many different cars which are tested and set up for the various tracks around the NASCAR circuit. It's simply easier to switch to another car than to make all of the necessary changes to a single car when going to the next track. Plus, they usually have a back up car in case of a crash as well. Tracks don't change as often as the cars do, so once you get one "dialed in", you keep it that way and build another for the next track.
43 cars race in each Nascar Sprint Cup race. The numbers change on how many enter.
The Nascar Cup Series fields 43 drivers at every race they go to on the schedule.
43 drivers are in one Nascar Sprint Cup Series race.
yes
No, they do not. Manual transmissions are used in Nascar race cars.
It seems highly unlikely that Nascar will ever race strictly stock cars again.
in Nascar it is 43 world of outlaws sprint cars is 24 and any other unknown race track has as many cars that enter the race in each class
Yes they can. Any race or gender can participate in Nascar racing.
Talladega
Depends on the race, during NASCAR events the NASCAR stock cars race, during the 24 hours at Daytona event different sports cars race.
No, they do not.
Chevy Volt