Refraction occurs when___? a) light travels through two adjacent media with different optical densities
b) the angle of refraction equals zero
c) the angle of incidence equals zero

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

Which branches of natural science include the study of an organism that lived 10 million years ago

What is the speed of an object at a given moment?