Which method is used to deliver heat in most central heating systems?

a. conduction
b. convection
c. radiation

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.

What is the difference between mass density and weight density?

Two models of the same compound are shown. in what way is model b better than model a? model b shows the types of elements in the compound, but model a does not. model b shows the three-dimensional shape of the molecule, but model a does not. model b shows how the atoms in the molecule are connected, but model a does not. model b shows the number of atoms of each element in the molecule, but model a does not