Which one of these elements is the lightest: 1- oxygen , 2- carbon , 3- nitrogen , 4- neon. idk what neon is but that’s an answer so...

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

One nanometer is equal to how many meters?

Liquid from a brewery fermentation contains 10% ethanol and 90% water. part of the fermentation product (50,000 kg/h) is pumped to a distillation column on the factory site. under current operating conditions, a distillate of 45% ethanol and 55% water is produced from the top of the column at a rate of one-tenth that of the feed. what is the composition of the waste "bottoms" from the still?