I was walking down a street and about a foot from the road I noticed these things. There are two styles. One has the date 1937 on it. Another has a thing that says, Open. The top of one was smashed in and there were gears in it. Here are some pics:
No, it's called a lock cylinder. The ignition switch is just an electrical switch. If they're using a screwdriver, they've already removed the lock cylinder
The best thing you could is probably alert your local police department, let them know that some drivers are speeding all the time. I had the same problem here where I live. I went to the police department, and within a week there was always a police car at the main street, that where all the speeding was happening. It work, now everybody that drives by goes by the limit
You need an ignition assembly and key.
No-one knows. It is certainly not just a property of mass. Its effect can be measured on energy and on massless particles. If this were not the case then perpetual motion would be possible. General relativity does indeed describe gravity as a curvature of space-time. But whether this is the source of gravity is unclear, because GR is a classical and not a quantum theory, and most other forces are described as having a quantum source.
