What is the formula for calculating mechanical power

Which of the following are equivalent units? A) a watt and a joule B) a newton-meter and a joule C) a newton and a joule/sec D) a watt and a newton

The radius of earth is 6,370,000m. Express this measurement in km in scientific notation with the correct number of significant digits.

What is positive and negative work? Can I have an example of both?

A list of common insulators Physics question

Which method of generating electrical energy results in electricity that is relatively easily distributed to where it is needed, when it is needed? A. using coal-fired power plants B. using tidal flow generators C. using wind turbines D.

The first hominine in the genus Homo was named Homo habilis because evidence indicates that members of the species used

Planets move around the sun in elliptical orbits. A. true B. false

A 113 kg man sits on the stern of a 6.3 m long boat. The prow of the boat touches the pier, but the boat isn't tied. The man notices his mistake, stands up and walks to the boat's prow, but by the time he reaches the prow, it's moved 3.

What os the term for the smallest bit into which chemical substance can be divided and still have the properties of that substance A : eletron B:molecule c:atom D:ion

How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57*10-21 newtons?