A electric model train travels at 0.339 m/s around a circular track of radius 1.75 m. How many revolutions does it perform per second, i. e, what is the motion's frequency?

Is giving expert testimony fairly easy part of a forensic scientists job?

Why does a black ball appear black in white light?

What is required for an electric charge to flow through a wire?

The chemical formula for naphthalene is C10H8. It's used to make mothballs and pesticides. In 4C10H8, the coefficient is blank, the subscript of carbon is blank, and the subscript of hydrogen is blank

When is the only time that an object has no gravitational potential energy

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

Explain Newton's First Law for the following. If you walk across the room holding a ball, when should you drop it to ensure that it lands on a target? Before, after or when you are directly on the target?