What’s black when you get it, red when you use it, and white when you’re all through with it?

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

The excretory system,need answers for all: )

Which of the following has wavelength longer than the wavelength of viable light? a) x rays b) gamma rays c) radios waves d) ultraviolet waves