1. an object with a mass of m is thrown straight up near the surface of the earth. while the object is going up, the net force on it is
a) zero.
b) less than mg. c) equal to mg. d) more than mg.

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k

An owl dives toward the ground with a constant velocity of 4.40 m/s at 53.0° below the horizontal. the sun is directly overhead and casts a shadow of the owl directly below it. what is the speed (in m/s) of its shadow on level ground?

An atom that has gained or lost electrons is called an _