In a surface wave (like water) the water goes up and down, but the wave travels across (parallel to) the surface.
Attractive Property – Magnet attracts ferromagnetic materials like iron, cobalt, and nickel.
Repulsive Properties – Like magnetic poles repel each other and unlike magnetic poles attract each other.
Directive Property – A freely suspended magnet always points in a north-south direction.
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Answer:
12 m
Explanation:
Hi! The ecplanation is based on the figure. Lets call the mirrors M1 and M2. Your head is the triangle called A, facing towards M1
Then:
A' is the image (virtual) of A given by M1. This is the image of your face.
A'' is the image of A given by M2. This image A'' when reflected by M1 produces image A'''. This is the image of the back of your head you see. It is 12 m away of you.
B. The sun was in the center of Ptolemy's model, but the Earth was in the center of Copernicus' model.
I think true but not sure about it