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kramer
3 years ago
12

While exploring a rock formation hero finds a rock that has Footprints pressed into it a geologist tells hero that the rock is m

illions of years old which of these statements is correct about heroes finding
Social Studies
1 answer:
spin [16.1K]3 years ago
7 0

Hello. This question is incomplete. The full question is:

"While exploring a rock formation, Hiroto finds a rock that has footprints pressed into it. A geologist tells Hiroto that the rock is millions of years old. Which of these statements is correct about Hiroto’s find?

A.It is not a fossil, because footprints are not fossils.  B.It is not a fossil, because only whole organisms are fossils.  C.It is a fossil only if Hiroto finds actual parts of the organism in rocks nearby.  D.It is a fossil because footprints of organisms from million of years ago are considered to be fossils. "

Answer:

D.It is a fossil because footprints of organisms from million of years ago are considered to be fossils.

Explanation:

Fossils are body remains of animals and plants trapped in rocks for thousands of years. These traces can be parts of the body, body structure, tracks, footprints, among others. An example of this can be seen in the question above, where Hiroto found a mark caused by an animal on a rock. In short, Hiroto found a rock with pressed footprints that is approximately millions of years old. He found a fossil.

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3 0
3 years ago
A structural component in the form of a wide plate is to be fabricated from a steel alloy that has a plane strain fracture tough
bogdanovich [222]

Answer:

a > 3 mm

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Explanation:

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solution

we know  critical stress formula that is

critical stress \sigma c = \frac{K}{Y\sqrt{\pi * a} }    .............................1

here K is design stress plane strain fracture toughness and a is length of surface creak

so here length of surface creak will be

length of surface creak a =  \frac{1}{\pi} * (\frac{K}{Y*{\sigma}})^2

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