The isotope of uranium suitable for nuclear fission in a power station is uranium-235, but in natural uranium only 0.711% is U-235, the rest is U-238. How much U-235 could be extracted from 32.3 kg of natural uranium?

A1200 kg car traveling north at 10 m/s is rear-ended by a 2000 kg truck traveling at 30 m/s. what is the total momentum before and after the collision?

Orange juice has a lower or higher viscosity than chocolate syrup

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve