an empty relative density bottle weights 20g. the bottle weights 40g when filled with petrol and 60g when filled with water. determine the density of the petrol.( density of water=1000kg/m³)​

List four observations that indicate that a chemical reaction may be taking place

Schrodinger and heisenberg developed an alternate theory about atomic nature that contradicted some of bohr's model of the atom. how do changes resulting from new technology and evidence affect the reputation of the atomic theory?

Each pair of clay balls represents to planetesimals if each plane test molluscum pound of the same material and is separated by the same distance which pair experiences the greatest gravitational attraction