Did I do this right? The rounding part and also the graph and velocity.

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

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

What is the primary force that suspension bridges use cables to hold their spans up? a. tension force b. resistance force c. normal force d. elastic force e. applied force