This is ROCK so it will SINK
Sink
denser things sink faster the denser it is then the faster it will sink
Probably because it draws/absorbs the heat making the heat "sink" into it
It can sink or float, it depends on your sperms density
Because they are meant for a man to go through them
Manholes are human access points for when the sewer system needs maintenance or repair.
There are approximately 100,000 manholes in Manhattan.
If they were rectangular they could fall down the manhole.
10
Outside diameter (OD) of adjacent manholes (including the bottom slabs) should have minimum of five (5) feet horizontal clearance.
No it is NOT legal, AND it's dangerous. Manholes are covers for many utility lines and anything within them is either private property (phone company - cable company - water company - etc) or government property. You would be trespassing. ADDITIONALLY - dangerous gases and oxygen depleted air collects in manholes and if you descend into one you could be overcome and die.
it is maximum 120 m .
They're called manholes, I think.
There are at least as many covers as there are finished manholes. Most manholes are already covered, and there are covers in stock ready to replace them, and covers in the factory ready to ship out. Unfinished manholes are relatively rare, but safety practices would probably require that random holes in a construction site should be covered by something. If you knew the proportion of unfinished manholes to stored and unused covers, you might be confident enough to boil it down to "There are at least as many covers as there are manholes."
Good question...have to use an estimate, because I am sure there isn't nationwide numbers on this. EPA estimates that there is 740,000 miles of public sewer lines in the US* and on average length between manholes on a city street is 300-400 feet. So multiply 740,000 x 5280 / 350 which equals.... 11,163,428 So roughly 11 million manholes in the united states.
Good question...have to use an estimate, because I am sure there isn't nationwide numbers on this. EPA estimates that there is 740,000 miles of public sewer lines in the US* and on average length between manholes on a city street is 300-400 feet. So multiply 740,000 x 5280 / 350 which equals.... 11,163,428 So roughly 11 million manholes in the united states.