No, cause the heavily loaded trucks use more power than the empty trucks. I see you have the same homework assignment as me...
Yes, vacuum trucks are used to empty septic systems. A company that cleans septic tanks most likely has vacuum trucks.
A gas saving device for freeway speeds when running empty or light.
Between 21,000 and 25,000 lbs, depending on specifics.
Yes
When they're empty, they can be a nuisance. Loaded, more of less like any other truck.
Empty Net Goal Allowed
The empty weight of a 26 foot Penske rental moving truck is about 9,000 to 12,500 pounds. It depends on the make of the truck. The International and Freightliner trucks of this type are about 12,400 pounds at empty weight.
An empty container can be checked through airport security. There are no restrictions on empty containers, however, if something seems suspicious, you will not be allowed to take it through security.
Max allowed weight - tare (empty) weight = permissible payload weight.
A very common defense is castling. When the board is rook/empty square/empty square/king the king can move two spaces toward the rook, and the rook can move on the other side of the king. This is allowed to be done in one turn. Before: rook/empty square/empty square/king after: empty square/king/rook/empty square
It allowed him to conclude that an atom is mostly empty space with a nucleus