If 30 wave crests pass by you in 10 seconds, what is the wave’s frequency?

Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?

What is part of a line has one endpoint and continues in one direction?