A train travels 160 km in 2 h. What is the train's average speed in km/h?

How do homogeneous mixture differ from heterogenous mixture? Where does the compound table salt (NaCl) fit into this description?

Order the steps to describe how information is sent. A signal is produced. A signal is seen, heard, or used. Radio waves are modulated and amplified. Radio waves are amplified and demodulated.

Why efficiency of a simple machine can not exceed 100%

Why are energy pyramids usually no more than 4 trophic levels?

When a trebuchet counterweight is hoisted by soldiers, what form of energy is transferred into the machine as work?

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