The half-life of fluorine-20 is 11.4 seconds. after seconds, 1/4 of the original amount of fluorine-20 will remain

What reaction is taking place? 02 + c3h8 = h20 + co2

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?