A boy with a mass of 66 kg sits on a see-saw, 1.2 meters from the fulcrum. How far from the fulcrum will a 44-kg girl need to sit to balance the boy?

Why is the mechanical advantage of using a single pulley always 1? Assume there's no friction.

For all values of x, y, and z, which expression is equivalent to 5xy. 5z? 5 (x + y + 2) 10xyz 25xyz 25 + x + y + z

Starting at its rightmost position, it takes 2 seconds for the pendulum of a grandfather clock to swing a horizontal distance of 18 inches from right to left and 2 seconds for the pendulum to swing back from left to right.

Edward travels 150 kilometers due west and then 200 kilometers in a direction 60° north of west. What is his displacement in the westerly direction

A boy pulls a wagon with a force of 6N east as another boy pushes it with a force of 4N east. What is the net force

How many earth years does it take mars to orbit the sun

Which represents a system that is almost completely closed?

If many household substances classify as acids or bases what is the ph scale

A protostar forms once the nebular cloud condenses and the core begins

How do whales bats and dolphins use echolocation? A To scare away predators B To attract mates C To orient them selves and find food D To tell animals of there species where they are