Aphysical science test book has a mass of 2.2 kg. what is the weight on the earth
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Ответ:
On Earth, acceleration of gravity = 9.8 m/s² (rounded)
On Earth, 2.2kg of mass weighs (2.2kg) x (9.8 m/s²) =
21.6 kg-m/s² = 21.6 Newtons.
(That's about 4.85 pounds.)
Ответ:
As I understand, a "wave" means "electromagnetic wave," or "light." These waves may reflect from a mirror (other waves also may reflect, for example, waves on a water surface may reflect from a wall).
The main law of reflection is that an angle of reflection is the same as an angle of incidence. They are both measured from the normal at the point of incidence (normal is a straight line perpendicular to a mirror...