Until the 1600s, people who investigated problems related to our understanding of the natural world were called

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?