Dropping a temporary magnet on the floor may destroy its magnetism because the floor absorbs the magnetic field the domains are knocked out of alignment the electrons start spinning the other way the heat generated by the collision destroys the magnetism

Dropping a temporary magnet on the floor may destroy its magnetism because the domains are knocked out of alignment

Explanation:

An object behaves as a magnet when all the domains are aligned in a single direction. A temporary magnet is created when domains are temporarily aligned in the presence of another magnetic field. When this magnet is dropped on the floor, the domains dis-align causing the demagnetization of the magnet.  

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures