Результаты (
английский) 1:
[копия]Скопировано!
Two similar-sized helicopters(a)) add paper clips to one: the heavier one spins more and reaches the ground first.(b)) make one with longer rotor blades than the other: the one with the longer rotor blades takes longer to reach the ground (more surface area to experience air resistance-think of a parachute).
переводится, пожалуйста, подождите..
