What are the limitations of Doppler effect?

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

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules