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emmasim [6.3K]
3 years ago
14

Earth whose in situ weight is 105lb/cf and whose compacted weight is 122 lb/cf is placed in a fill at the rate of 260 cy/hr, mea

sured as compacted earth. The thickness of the compacted layers is 7 in. A roller having a drum width of 50 in operates at a speed of 2 mph. Assume a 55-min hour operation efficiency. Determine the number of rollers required to provide the necessary compaction if four passes are specified for each layer of earth.

Engineering
1 answer:
Stells [14]3 years ago
6 0

Answer:

Number of rollers required to complete the compaction are 2

Explanation:

The solution is given in the attachments.

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During genetic engineering, how do Restriction enzymes know what base pairs to act on?
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Answer:

The correct/closest option is b

Explanation:

Restriction enzymes are enzymes (endonucleases) that cut short DNA strands at specific sites. Hence, each restriction enzyme has it's own specific site (between two bases) it cuts at. There are two types of end that can be produced by this cut; the blunt end and the sticky end.

A restriction enzyme recognizes (palindromic sequence) and cut in it's own specific end.

For example, if a restriction enzyme cuts between a guanine (G) and an adenine (A), and it cuts a palindromic double stranded DNA in the manner below, it produces a sticky end.

G║AATTC

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And if a restriction enzyme cuts between guanine (G) and cytosine (C) in the manner below, it produces a blunt end.

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Hence, from the question, restriction enzymes (although chosen by the scientist based on desired sequence to be cut) recognize the sticky or blunt ends itself.

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spayn [35]

Answer:

\triangle V_0=0.08V

Explanation:

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Therefore

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