Question

We hear the sound of the cracker a little later after seeing the cracker burst.

Answer 1

Answer:

the primary reason of seeing the crackers brust and hear the sound later because the speed of sound and light....

Explanation:

speed of light in the vicinity of 3*10^8m,/sec while the speed of the sound is a distance of 332m/sec

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Answer 2

Lodestone, a natural magnet, attracting iron nails. Ancient humans discovered the property of magnetism from lodestone.

An illustration from Gilbert's 1600 De Magnete showing one of the earliest methods of making a magnet. A blacksmith holds a piece of red-hot iron in a north–south direction and hammers it as it cools. The magnetic field of the Earth aligns the domains, leaving the iron a weak magnet.

Drawing of a medical treatment using magnetic brushes. Charles Jacque 1843, France.

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