Which of the following is created by fans? a) air flow b) water flow c) wastewater flow d) vacuum flow

This is the substance(s) formed in a chemical reaction.

The two required components for a generator

Two forces produce equal torques on a door about the door hinge. the first force is applied at the midpoint of the door; the second force is applied at the doorknob. both forces are applied perpendicular to the door. which force has a greater magnitude?