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SVETLANKA909090 [29]
3 years ago
7

What is the potential energy of a spring that is compressed 0.65 m by a 25 kg block if the spring constant is 95 N/m?For which e

quations below is x = –3 a possible solution? Select three options.
Chemistry
1 answer:
tangare [24]3 years ago
6 0

Answer:

socratic should help you with that

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A human lung at maximum capacity has a volume of 3.0 liters. If the partial pressure of oxygen in the air is 21.1 kilopascals an
Juliette [100K]

V = maximum capacity of human lung = 3 liter = 3 x 0.001 m³ = 0.003 m³      (Since 1 liter = 0.001 m³)

P = pressure of oxygen = 21.1 kilo pascal = 21.1 x 1000 = 21100 Pa      (since 1 kilo = 1000)

T = temperature of air = 295 K

n = number of moles of oxygen

Using the ideal gas equation

PV = n RT

inserting the above values in the equation

(21100) (0.003) = n (8.314) (295)

n = 0.026 moles



4 0
3 years ago
A 100 kg tree gets struck by lightning and is burned completely to ash. A scientist gathers up all the ash and weighs it to find
Oksi-84 [34.3K]

Answer:

Evaporated via combustion.

Explanation:

The loss on ignition (LOI) and Ash content are inorganic analytical techniques used to determine the percentage by mass of hydrocarbon in compounds. This process allows volatile matter and possibly impurities found in a material to evaporate, leaving behind the true chemical constituents of the material.

The 10kg lost could be moisture content of the tree, or other volatile matter which has escaped on combustion of the tree.

6 0
3 years ago
Why is coal not a mineral?
mixas84 [53]

Answer:

It does not have a regular composition.

Explanation:

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When a solution is allowed to crystallize slowly, impurities are excluded from the growing crystal structure because: A. The mol
Oliga [24]

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B

Explanation:

4 0
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How does density vary with temperature?
nexus9112 [7]
Things expand when heated. therefore the molecules are farther apartand the matierial is less dense. Things expand because their molecules are vibrating faster and are taking up more space

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4 years ago
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