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Elina [12.6K]
3 years ago
5

Magnetic reversals have helped to support

Physics
1 answer:
sveticcg [70]3 years ago
5 0


Magnetic reversals have helped support the theory of sea floor spreading, that Harry Hess, professor of geology had put forth. He proposed that the ocean progressively widens as new sea floor is created along a crack that follows the crest of ridges found in the middle of the ocean.

In 1963, Fred Vine, Drummond Mathews and others found that the crust surrounding the mid-ocean ridges showed alternating bands, each band magnetized with a polarity opposite the surrounding bands. They suggested that as new sea-floor crust was formed around the crack or rift in the mid-ocean ridge, it magnetized differently depending upon the polarity of the planet at that time, supporting the theory of Harry Hess.  


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Hi there!

So, I believe an <em>isobar</em> connects areas of the same atmospheric pressure, and an <em>isotherm</em> connects areas of the same temperature. Hope this helped :)

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Answer:

The 40g mass will be attached at 69 cm

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First, make a sketch of the meterstick with the masses placed on it;

--------------------------------------------------------------------------

               ↓                    Δ                      ↓

             20 g.................50 cm.................40g

                         38 cm                  y cm  

Apply principle of moment;

sum of clockwise moment = sum of anticlockwise moment

40y = 20 (38)

40y = 760

y = 760 / 40

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Therefore, the 40g mass will be attached at 50cm + 19cm = 69 cm

              12cm             50 cm              69cm

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               ↓                    Δ                      ↓

             20 g.................50 cm.................40g

                         38 cm                 19 cm                                              

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

5 0
3 years ago
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