Who is exerting more power on a 15 m flight of stairs ? A 90 kg student runs in 12 seconds . A 60 kg student runs in 7 seconds .

The answer should be vaporization 

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.

The answer for this is a