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Valentin [98]
3 years ago
11

How do scientists know the continents were once closer than they are today? Explain your answer in 2-3 complete sentences.

Physics
1 answer:
WITCHER [35]3 years ago
6 0

Answer:

Continental drift describes one of the earliest ways geologists thought continents moved over time. Today, the theory of continental drift has been replaced by the science of plate tectonics. 

 

The theory of continental drift is most associated with the scientist Alfred Wegener. In the early 20th century, Wegener published a paper explaining his theory that the continental landmasses were “drifting” across the Earth, sometimes plowing through oceans and into each other. He called this movement continental drift. 

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Gnesinka [82]
Salutations!

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Thus, your answer is option B.

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3 years ago
You hang a heavy ball with a mass of 30 kg from a tungsten rod 2.8 m long by 1.5 mm by 2.6 mm. You measure the stretch of the ro
guajiro [1.7K]

Answer:

Young's modulus (Y) = 3.56×10^11 N/m^2

The speed of sound in tungsten = 6166.4 m/s

Explanation:

Young's modulus (Y) = stress/strain

Stress = force/area

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Stress = 294/3.9×10^-6 = 7.54×10^7 N/m^2

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Strain = 0.000594/2.8 = 2.12×10^-4

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h = 3.56×10^11/(18,700×9.8) = 1.94×10^6 m

From the equations of motion

v^2 = u^2 + 2gh =

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v = sqrt (2×9.8×1.94×10^6)

v = 6166.4 m/s

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4 years ago
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