The lower the__ the frequency, the __the pitch

-lower
-higher

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Could someone . i have tried to solve myself but my calculation is off

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.