3 years ago

Which of these pieces of evidence did NOT help in the development of the theory of plate tectonics?

Physics

1 answer:

Ray Of Light [21]3 years ago

3 0

<span>C) Most earthquakes and volcanoes occur along distinct lines around the world.
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As distance between them decreases, gravitational force increases. Hence A is correct.

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A block of mass 9.2kg rests on a slope an angle of 26.9∘ relative to the horizontal. What is the size of the contact force norma

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80.4 N

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As the block is at rest on the slope, it means that all the forces acting on it are balanced.

We are only interested in the forces that act on the block along the direction perpendicular to the slope. Along this direction, we have two forces acting on the block:

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Since the block is in equilibrium along this direction, the two forces must balance each other, so they must be equal in magnitude:

$N=mg cos \theta$

And by substituting the numbers into the equation, we find the size of the contact force normal to the slope:

$N=(9.2 kg)(9.8 m/s^2)(cos 26.9^{\circ})=80.4 N$

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