pls answer properly I will rate 5 and brainlist just answer properly and I need it now just answer what you know in the question

Fire is a chemical hazard, because of explosives and nukes. Falling debris is physical, difficulty breathing is a biological hazard, and fungi, pesticides, and cockroaches are biological as well. Muriatic acid is chemical, so is bleach. And any vibrations and noises or corrosion are physical.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3