No system is completely closed off from its surroundings. Which example represents a system that is almost completely closed?

a campfire

a sealed, insulated cooler

a bowl of soup

a filled bathtub

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

Ascientific blank must be testable and capable of being proven false?

Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.