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crimeas [40]
3 years ago
15

In a series of undisturbed rock layers where shale lies between sandstone below and limestone above, the ____.

Physics
2 answers:
larisa86 [58]3 years ago
8 0
The answer to the question '<span>In a series of undisturbed rock layers where shale lies between sandstone below and limestone above, the __." would be limestone is youngest. Out of all the rock layers, the limestone is dated to be the youngest of all.</span>
Brums [2.3K]3 years ago
7 0
<h3><u>Answer;</u></h3>

Limestone is the youngest

<h3>Explanation;</h3>
  • Age of sedimentary rocks refers to the time that took for the material making the rock layer to be deposited.The determination of relative ages of sedimentary layers is based on the order in which the geologic events took place.
  • Therefore,<em><u> if a layer of sediment overlies another layer , it means that the overlying layer must be younger.</u></em>
  • <em><u>Same case if a layer of of shale lies between sandstone below and limestone above, it means that the limestone is the youngest among the three rock layers.</u></em>
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Answer:

2.17 Mpa

Explanation:

The location of neutral axis from the top will be

\bar y=\frac {(240\times 25)\times \frac {25}{2}+2\times (20\times 150)\times (25+(\frac {150}{2}))}{(240\times 25)+2\times (20\times 150)}=56.25 mm

Moment of inertia from neutral axis will be given by \frac {bd^{3}}{12}+ ay^{2}

Therefore, moment of inertia will be

\frac {240\times 25^{3}}{12}+(240\times 25)\times (56.25-25/2)^{2}+2\times [\frac {20\times 150^{3}}{12}+(20\times 150)\times ((25+150/2)-56.25)^{2}]=34.5313\times 10^{6} mm^{4}}

Bending stress at top= \frac {630\times 10^{3}\times (175-56.25)}{34.5313\times 10^{6}}=2.1665127\approx 2.17 Mpa

Bending stress at bottom=\frac {630\times 10^{3}\times 56.25}{34.5313\times 10^{6}}=1.026242858\approx 1.03 Mpa

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3 years ago
A bowling ball is dropped from rest. what is the ball’s velocity after falling for 4 seconds?
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