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3 years ago

5

What is the weight of a 0.20mg strand of hair?

2 answers:

Basile [38]3 years ago

6 0

Answer:

How much does a hair weigh in MG?

An average hair (about six inches in length) weighs about 0.2-0.4 milligrams or 0.00015 ounces. A healthy person has anywhere between 80,000 and 120,000 hairs on their head.

Explanation:

valkas [14]3 years ago

3 0

Answer:

0.20mg

Explanation:

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The concepts used to solve this exercise are given through the calculation of distances (from the Moon to the earth and vice versa) as well as the gravitational potential energy.

By definition the gravitational potential energy is given by,

$PE=\frac{GMm}{r}$

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m = Mass of Moon

G = Gravitational Universal Constant

M = Mass of Ocean

r = Radius

First we calculate the mass through the ratio given by density.

$m = \rho V$

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$m = 7.210*10^{11}Kg$

PART A) Gravitational potential energy of the Moon–Pacific Ocean system when the Pacific is facing away from the Moon

Now we define the radius at the most distant point

$r_1 = 3.84*10^8 + 6.4*10^6 = 3.904*10^8m$

Then the potential energy at this point would be,

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PART B) when Earth has rotated so that the Pacific Ocean faces toward the Moon.

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$r_2 = 3.84*10^8-6.4*10^6 - 3.776*10^8m$

The we calculate the Potential gravitational energy,

$PE_2 = \frac{GMm}{r_2}$

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$PE_2 = 9.361*10^{15}J$

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3 years ago

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Explanation:

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3 years ago