What is the difference between comparative advantage and absolute advantage?

Comparative advantage measures opportunity cost and absolute advantage measures efficiency.
Absolute advantage measures opportunity cost and comparative advantage measures production cost.
Comparative advantage measures sale price and absolute advantage measures production cost.
Absolute advantage measures sale price and absolute advantage measures production cost.

In physics the desire of an object to keep doing what it is doing is termed?

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?