An object has a density of 20 g/cm 3 . when placed in a cylinder, it displaces 5 ml of water. what is the mass of the object?

In positive numbers less than 1, the zeros between the decimal point and non zero are significant

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match