Auniform wire with mass m and length l is bent into a semicircle. a. find the magnitude of the gravitational force this wire exerts on a point with mass m placed at the center of curvature of the semicircle.

Can anybody me with this? ? (picture included.)

Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?

The dot diagram represents the motion of the motorcycle as it moves from left to right