A rock falls from rest off a high cliff. How much time does it take for the rock to reach a speed of 40 m/s? [ignore air resistance.]

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.

snell's law

refractve index = sin incidence / sin refraction

the journeys of marquette, joliet and la salle a) new france expand.

all three of these explorers explored the midwest and the area around the great lakes, which they subsequently claimed for france.

this was a big portion of territory and expanded new france which before then only consisted of quebec province in northeastern canada