What starting element undergoes alpha decay to yield uranium-234 (u) as a product?

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?