A train travels 90 kilometers in 1 hours, and then 60 kilometers in 3 hours. What is its average speed

The overall shape of our milky way galaxy is thought to be

Something that claims to be science but it is not is called beginning science pseudoscience common science theoretical science

A fundamental problem in traditional personal character development is that specific vales are used to teach about a philosophy, which may be inappropriate where cultural diversity and privacy must be respected. A solution is

What do radio waves, microwaves, light, and x-rays have in common?

Which refers to the distance between two crest or to drafts on a transverse wave

Show that the Newton has the units of mass times acceleration.

Light travels at 150000000km from the sun to earth in 8 minutes. What speed is this in Km/s

Electricity problem (coulomb's law)

An observer (O) spots a plane (P) taking off from a local airport and flying at a 29° angle horizontal to her line of sight and located directly above a tower (T). The observer also notices a bird (B) circling directly above her.

In order for convection to occur, you must have