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2 years ago

13

Students are investigating the rocks with fossil markings that are found in an area that was once covered by a lake. The rocks t

hey are observing are MOST likely —
igneous
metamorphic
sedimentary
thermic

2 answers:

Paul [167]2 years ago

8 0

Answer:

sedimentary rock

Explanation:

guajiro [1.7K]2 years ago

4 0

Answer:

sedimentary

Explanation:

Hope it helped! Enjoy

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2 years ago

A 2.00 meter long horizontal plank whose mass is 3.00 kg is placed so that the very end (the right end) rests on a retaining wal

avanturin [10]

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$R_g=\frac{61}{7} =8.7143\ N$

$R_w=45.1857\ N$

Explanation:

Given that:

mass of plank, $m=3\ kg$

length of plank, $l=2\ m$

From the image we can visualize the given situation.

Consider the given plank to be mass-less and having a uniformly distributed mass of 1.5 kg per meter.

<u>Now in the balanced condition:</u>

$\sum F=0$

$R_g+R_w=(3+2.5)\times 9.8$

$R_g+R_w=53.9\ N$ .......................(1)

$\sum M_w=0$

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is the force acted by the tailgate on the plank.

<u>Substitute the value from (2) into (1):</u>

$R_w=45.1857\ N$ is the force acted by the wall upon the plank.

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3 years ago