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2 years ago

Explain why the atomic mass of an element is weighted average mass

Physics

1 answer:

madreJ [45]2 years ago

3 0

Explanation:

The mass written on the periodic table is an average atomic mass taken from all known isotopes of an element. This average is a weighted average, meaning the isotope's relative abundance changes its impact on the final average. The reason this is done is because there is no set mass for an element.

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he drag characteristics of a torpedo are to be studied in a water tunnel using a 1 : 7 scale model. The tunnel operates with fre

dusya [7]

Answer:20.03 m/s

Explanation:

Given

$L_r=1:7$

velocity of Prototype $v_p=53 m/s$

Taking Froude number same for both flow as it is a dimensionless number for different flow regimes in open Flow

$(\frac{v_m}{\sqrt{L_mg}})=(\frac{v_p}{\sqrt{L_pg}})$

$v_m=v_p\times \sqrt{\frac{L_m}{L_p}}$

$v_m=53\times \frac{1}{\sqrt{7}}$

$v_m=20.03 m/s$

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2 years ago

What gases are exchanged in the respiratory system

Makovka662 [10]

Oxygon and Carbon are exchanged in the respiratory system hope this helps! :D

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2 years ago

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How long have us been attempting space travel?

chubhunter [2.5K]

The first attempt was made in 1957

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3 years ago

Part A Where is the near point of an eye for which a contact lens with a power of 2.80 diopters is prescribed? (Assume that near

Ira Lisetskai [31]

Answer:

-83.33 cm

-62.5 cm

Explanation:

u = Object distance

v = Image distance

f = Focal length

Power is given by

$P=\frac{1}{f}\\\Rightarrow f=\frac{1}{P}\\\Rightarrow f=\frac{1}{2.8}\\\Rightarrow f=0.35714\ m=35.714\ cm$

Lens equation

$\frac{1}{f}=\frac{1}{u}+\frac{1}{v}\\\Rightarrow \frac{1}{f}-\frac{1}{u}=\frac{1}{v}\\\Rightarrow \frac{1}{v}=\frac{1}{35.714}-\frac{1}{25}\\\Rightarrow v=-83.33\ cm$

The object distance is -83.33 cm

$P=\frac{1}{f}\\\Rightarrow f=\frac{1}{P}\\\Rightarrow f=\frac{1}{-1.6}\\\Rightarrow f=-0.625\ m=-62.5\ cm$

$\frac{1}{f}=\frac{1}{u}+\frac{1}{v}\\\Rightarrow\frac{1}{f}=\frac{1}{\infty}+\frac{1}{v}\\\Rightarrow \frac{1}{f}=\frac{1}{v}\\\Rightarrow f=v\\\Rightarrow v=-62.5\ cm$

The far point of the lens is -62.5 cm

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3 years ago

What ion is most closely associated with bases?

KatRina [158]

The ion most closely associated is hydroxide.

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3 years ago

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