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romanna [79]
3 years ago
11

Which of the following characteristics of the pineal gland is not correct? A. The pineal gland is located in the brain, above th

e cerebellum. B. The pineal gland acts as an internal clock. C. The pineal gland regulates sleep and waking cycles. D. The pineal gland regulates salt and water levels.
Chemistry
1 answer:
Marina CMI [18]3 years ago
4 0

Answer:

D

Explanation:

The pineal gland regulates salt and water levels.

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Calculate the magnitude and direction (i.e., the angle with respect to the positive H-axis, measured positive as counter-clockwi
r-ruslan [8.4K]

The graphics in the attachment is part of the question, which was incomplete.

Answer: Fr = 102N and angle of approximately 11°.

Explanation: From the attachment, it is observed that from the three forces acting on M, two are perpendicular. So to find them, we have to show their x- and y- axis components. From the graph:

Fx = 70+40-10 = 100

Fy = 40-20 = 20

Now, as the forces form a triangle, the totalforce is:

Fr = \sqrt{Fx^{2} +Fy^{2} }

Fr = \sqrt{10400}

Fr = ≈ 102N

To determine the angle requested, we use:

arctg H = \frac{Fy}{Fx}

arctg H = \frac{20}{100}

H = tg 0.2 ≈ 11°.

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I think that building on a green hill
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Answer:

Fe₃Si₇

Explanation:

In order to determine the empirical formula, we have to follow a series of steps.

Step 1: Determine the percent composition

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Si: 53.99%

Step 2: Divide each percentage by the atomic mass of the element

Fe: 46.01/55.85 = 0.8238

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Step 3: Divide all the numbers by the smallest one

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The empirical formula is Fe₃Si₇.

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