The following position vs time graph shows the motion of an object along its path from -10 to seconds. Based on this graph, what is the displacement of the object (its final position minus its initial position) along the entire 25 second span of time? A: 10m
B: 0m
C: -5m
D: -10m

Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.

Elements in group viiia (also known as group 18, or the noble gases) have similar properties because they all have a. the same number of electron shells b. full octets c. the same number of valence electrons d. the same number of electrons needed to fill their octet

Definition: this is the weighted average of all of the isotopes of an element.