gamergladiator43
20.07.2019 •
Mathematics
An escalator ascends 45 feet over a horizontal distance of 30 feet. what is the angle of elevation?
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Ответ:
cos θ=adjacent / hypotenuse
thus
adjacent=30 ft
hypotenuse=45 ft
thus
cos θ=30/45=2/3
hence
θ=arccos 2/3
θ=49.2°
Ответ:
C
Step-by-step explanation:
because you need the energy of the box to lift it, as my old professor used to say " you can only push on somthing as much as it can push you back "