A workman carries some lumber up a staircase. The workman moves 9.6m vertically and 22m horizontally. If the lumber weighs 45N. How much work was done by the workman?

He viscosities of several liquids are being compared. all the liquids are poured down a slope with equal path lengths. the liquid with the highest viscosity will

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

Positrons are spontaneously emitted from the nuclei of