if you are USA based then this could help you
http://www.awc.org/technical/spantables/tutorial.htm
in the UK which has differing requirements
this can help
http://www.rushcliffe.gov.uk/upload/public/attachments/39/TA008ceilings.pdf
Ceiling tiles are not all the same size, but I have often seen them in the size one foot by one foot.
How to calculate spanner size regarding bolts and nuts
You cannot:)
Yes.
The formula can't even be written unless you know either -- the size of one of the other sides of the triangle, and the size of the angles at both ends of it, or else -- the size of both other sides of the triangle, and the size of the angle between them.
The size of ceiling joists is primarily influenced by the span they need to cover and the load they must support. Other factors include the type of wood used for the joists, the spacing between joists, and any additional load considerations like heavy fixtures or storage. Local building codes and regulations also play a role in determining the size of ceiling joists.
For ceiling joists, the minimum dimension per the IBC is a 2 x 12 inch, with spacing dependent on the load. Ideally, these would be screwed to blocking between the joists.
Removing a wall cost $250 depending on the size. Labor may cost as much as $800, and $75 for ceiling joists.
That depends upon the size of the joists & grade/species of wood
Different situations call for different joists. Generally floor joists are 2 x 12.
Could be a couple of different reasons.... Your ceiling joists could be longer than the recommended span for the size of the joist [ie: 2x6 or 2x8], and over time the weight of the ceiling material and whatever is directly above them may be bowing the ceiling down.... or In older homes with plaster ceilings with wood lath instead of gypsum sheet panels [sheetrock], the plaster sometimes breaks free from the wood lath and sags. This especially happens when there has been a water leak above the ceiling at some point......
I take it you mean the area of the floor is 20 sq metres? In which case the ceiling would be the same size, but you can't calculate the area of the walls without knowing their height.
Ceiling tiles are not all the same size, but I have often seen them in the size one foot by one foot.
You need to know the amperage requirement of the pump and then you can calculate the wire size.
Depends on how far they span from bearing points.
The answer will depend on the size of the ceiling tiles!
If your house is wood framed with wood joists, the shaking may be caused by floor joists being too small. This will cause the floor to sink whenever a person walks across the room. Floor joists should be size by an experienced carpenter, architect, or engineer to prevent movement.Another cause of floor movement may be insufficient bracing between the floor joists. This will cause sagging and twisting of the joists.There are several solutions that require the skills carpenter. New joists can be added beside the existing joists to strengthen the floor. Another option is to add one or more beams and columns in the room below the floor. Or blocking can be added between existing joists to add support.