Recent content by gracemir

I got it. 1800 * 60 = 108000. 108000 / 7480 = 14.44

Homework Statement a good baseball pitcher can throw a baseball toward home plate at 85 mi/h with a spin of 1800 rev/min. how many revolutions does the baseball make on its way to home plate? for simplicity, assume that the 60 ft path is a straight line. Homework Equations The...

the definition of mu s is F sub s / N?

how to decide whether 12N is enough to move or not?

A 40-N crate rests on a rough horizontal floor. A 12-N horizonatl force is then applied to it. If the coefficients of friction are s = 0.5 and k = 0.4, the magnitude of the frictional force on the crate is: what i did was : 40*0.5=20 , 40*0.4=16 20+16=36 40/12=3.3 36/3=12...