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stiks02 [169]
3 years ago
12

A trilobite fossil weighing 0.059 N has an area of 0.0007 m2 that is in contact with a table. How much pressure does it exert on

the table?
a)2.89 x 10-8 Pa
b)4.13 x 10-5 Pa
c)1.19 x 10-2 Pa
d)84.3 Pa
Physics
1 answer:
Sophie [7]3 years ago
6 0
Pressure [Pa] = Force [N] / Area [m2].

So in your case Pressure = 0.059 / 0.0007 = 84.2857 Pa.

Correct answer d) 84.3 Pa
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1 ) a) increasing its thickness

2) c)potential difference
8 0
3 years ago
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What is the concentration of H+ ions at a pH = 8?
skelet666 [1.2K]

Taking into account the definition of pH and pOH, the concentration of H⁺ ions at pH=8 is 1×10⁻⁸ M and the concentration of OH⁻ ions at pH=8 is 1×10⁻⁶ M.

<h3>Definition of pH</h3>

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:

pH= - log [H⁺]= - log [H₃O⁺]

<h3>Definition of pOH</h3>

Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

<h3 /><h3>Relationship between pH and pOH</h3>

The following relationship can be established between pH and pOH:

pOH + pH= 14

<h3>Concentration of H⁺ ions</h3>

In this case, pH=8. Replacing in the definition of pH:

8= - log [H⁺]

Solving:

<u><em>[H⁺]= 10⁻⁸= 1×10⁻⁸ M</em></u>

Finally, the concentration of H⁺ ions at pH=8 is 1×10⁻⁸ M.

<h3>Concentration of OH⁻ ions</h3>

Being pH= 8, pOH is calculated as:

pOH + 8= 14

pOH= 14 - 8

pOH= 6

Replacing in the definition of pOH the concentration of OH⁻ ions is obtained:

- log [OH⁻]= 6

Solving

<u><em>[OH⁻]= 10⁻⁶= 1×10⁻⁶ M</em></u>

Finally, the concentration of OH⁻ ions at pH=8 is 1×10⁻⁶ M.

Learn more about pH and pOH:

brainly.com/question/16032912

brainly.com/question/13557815

#SPJ1

7 0
2 years ago
At a particular instant the magnitude of the gravitational force exerted by a planet on one of its moons is 7 × 1021 N. Collapse
9966 [12]

Answer:

Fg = 4.2*10²² N

Explanation:

The gravitational force between any two masses, provided that can be approximated by point masses (comparing their diameters with the distance between them), obeys the Newton's Universal Law of Gravitation, which states that the force (always attractive) is proportional to the product of  the masses and inversely proportional to the square of the distance between them (this as a consequence of our Universe being three-dimensional), as follows:

Fg =\frac{G*m1*m2}{r^{2}}

So, if one of the masses increases 6 times, the force between them will be directly 6 times larger, so the new magnitude of the force will be as follows:

Fg₂ = Fg₁*6 = 7*10²¹ N* 6 = 4.2*10²² N

7 0
3 years ago
An airplane leaves New York to fly to Boston it travels 1000 KM in two hours what is the average speed of the airplane
Korolek [52]

Answer: 500 KM per hour

Explanation:

5 0
3 years ago
Ahmad pulls a sled across level snow by 75 N . If the sled moves 15 m , how much work does Ahmad do on the sled?
Nataly_w [17]

Answer:

1125 J

Explanation:

W=F x s

= 75 x 15

=1125

4 0
3 years ago
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