They are either built by highly modifying a regular car (these are called "GT" class cars or "Grand Touring"), building them from scratch from a pre-built chassis or also highly modifying a street legal car (these kinds of race cars are usually owned by people who build them in their own shop to either drag race or take them to track day events), or like how Funny Cars or NASCARS (these are called "Stock Cars") are built where almost all of them look the same on the outside but underneath are parts that the company decides to put in (Chassis, engine, transmission, steering, suspension, brakes, etc.) as long as its within regulations.
to race, you have to be cool before your fast, then you have to get a car.
There are many types of each. Be more specific. They are each built for specific purposes.
If race cars didn't race they wouldn't be race cars.
Rally racing is a sport where you race cars on roads. These cars are modified for racing and usually are not built to drive on roads legally.
The founder Enzo Ferrari built cars to race his former employer
Solar cars were first built by universities and manufacturers
They are hand built with the finest of parts, craftsmanship, and very few are built each year. They are performers that are in essence race cars you can drive on the street.
Most race cars are only seat the driver, the only 2 seater race cars have a navigator like rally cars, and dessert race cars.
cars are built in car factories
yes
Their are several cars that don't qualify for a race because they where to slow. Only 43 race cars can be allowed to race so its not over crowded on the race track.
Formula One race cars are constructed primarily of Carbon Fiber.