You are given a rock that contains some zircons. When you measure the amount of uranium and lead in the zircons you find out that the zircons contain 325 atoms of Uranium-238 (the parent isotope) and 2275 atoms of Thorium-234 (the daughter isotope). If Uranium-238 has a half-life of 4.5 billion years, how old are the zircons? Does this answer make sense? Explain your reasoning.

Acoyote chasing a rabbit is moving 8.00 m/s due east at one moment and 8.80 m/s due south 4.25 s later. let the x axis point due east and the y axis point due north. find the direction of the coyote's average acceleration during that time.

Two horses begin at rest. after a few seconds, horse a is traveling with a velocity of 10 m/s west, while horse b is traveling with a velocity of 13 m/s west. which horse had a greater acceleration? a. horse a because its change in velocity was greater than horse b's in the same time. b. horse b because its change in velocity was greater than horse a's in the same time. c. horse b because its change in velocity was the same as horse a's, but it took less time. d. both horses had the same acceleration.

The inner planets or call terrestrial because they