Daniel and Christopher were on a plane traveling at a velocity of 200 km/hr south for 1,000 km. How long (in hours) was the plane flying at that velocity?

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

What is the difference between mass density and weight density?

Which statement describes the formation of our sun? a disk formed of long trails of stars coiled into a spiral. it formed an elliptical flattened disk. heat and gases contracted within a nebula. gravity pushed stars away from a center core.