Achild on a playground swing makes a complete to-and-fro swing each 2 seconds. the period is: 0.5 seconds 1 second 2 seconds

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

Aparticle moves in a circle 1.50 m in radius . through what angle in radians does it rotate if it moves through an arc length of 2.50m? what is the angle in degrees?

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?