Which, if either, requires more work: lifting a 50-kg sack a vertical distance of 2 m or lifting a 25-kg sack a vertical distance of 4 m?

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

Blank liquids and gases exert a buoyant force on objects placed in them

Astudent weighing 700 n climbs at constant speed to the top of an 8 m vertical rope in 10 s. the average power expended by the student to overcome gravity is most nearly