Four pulley system is shown in the diagram. If its efficiency is 80%, calculate by using the formula:
i. the effort applied to lift the load
ii. output work when the load is lifted up to 6 metres
iii. input work
iv. mechanical advantage

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.

Which graph represents motion with an object with positive velocity that is located at a position of 3 meters at a time of 0 seconds? a) a b) bb eliminate c) c d) d