Most energy in an ecosystem comes originally from_

Iwill give 30 points to whoever answers ! what is the formula for actual mechanical advantage and ideal mechanical advantage?

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.

Mark creates a graphic organizer to review his notes aboutelectrical force.which labels belong in the regions marked x and y?