Mountains in North America appear to be part of the same chain of mountains as those in Northern Europe.
Explanation:
One of the evidence Wegener used to develop the theory of continental drift is that he observed that mountains in North America appear to be of the same chain of mountains as those in Northern Europe.
Alfred Wegener in 1912, proposed his theory of continental drift to explain that continents have moved to their present day position. He called the original super continent, Pangaea.
His theory was refuted because there was no mechanism to explain the moving continents.
Some of his supporting observations are listed below
- Wegener observed that coal sequences in rocks of North America shared similar characteristics.
- The matching mountains chains along the edges of East South America and southern Africa provided backing for this idea.
- Mesosaurus fossils found between two continents.
- Fitting of the continents into a single land mass.
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Answer:
0.15694 m
Explanation:
m = Mass of block =
v = Velocity of block = 11.2 m/s
k = Spring constant = 110 N/m
Here the kinetic energy of the fall and spring are conserved
The amplitude of the resulting simple harmonic motion is 0.15694 m
Answer:
The question is incomplete, below is the complete question \
"A 75g bullet is fired from a rifle having a barrel 0.580m long. Choose the origin to be at the location where the bullet begins to move. Then the force (in newtons) exerted by the expanding gas on the bullet is 18000 + 10000x - 26000x2, where x is in meter. Determine the work done by the gas on the bullet as the bullet travels the length of the barrel."
The answer is
Explanation:
From the expression of work-done, which is the product of the force and the distance, mathematically,
since the force in the question is dependent on the distance covered, we can integrate over the distance to get the work-done, i.e
where a,b are the final distance and initial distance respectively.
From the question the force is giving as
since the bullet moves through the barrel of 0.580m long and choosing the origin as the location where the bullet begins to move, our integrating point will be
Hence, we can now write
integrating the expression,we have
to KJ we divide the workdone by 1000, hence
Answer:
C
Explanation:
a parallel circuit because there is more than one path
As for me, the reson why scientists usually write reports about their investigations is because they want to <span>d. to communicate their work to other scientist. As far as I am concerned in this sphere they have to get many other opnions besides their own in order to complete or expand one that they have made up. Hope it helps :)</span>