Chemistry, 15.04.2020 05:21 lestessanders02

Which situation has the greatest pressure? A. Atmospheric pressure at sea level, equal to 1.01 X 105 N/m2 B. The pressure that a person of mass 70 kg exerts on the floor when she balances on the ball of one foot, with an area of contact of 50 cm2 C. The pressure that a physics textbook of mass 2.5 kg exerts on a desk when it is lying flat on the desk, with an area of contact of 22 cm X 28 cm
(a) Identify the empirical formula of this compound.

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Answer from: endermss1970

Explanation:

We are given that

A.Atmospheric pressure= $P_0=1.01\times 10^5N/m^2$

B.Mass,m=70 kg

Area,A= $50 cm^2=50\times 10^{-4} m^2$

1 m^2=10^4 cm^2

Force=mg

Where g=9.8 m/s^2

Using the formula

$F=70\times 9.8=686 N$

$P=\frac{F}{A}=\frac{686}{50\times 10^{-4}}=1.37\times 10^5 N/m^2$

C.Mass ,m=2.5 kg

Area,A= $22\times 28=616 cm^2=616\times 10^{-4} m^2$

Pressure= $\frac{mg}{A}=\frac{2.5\times 9.8}{616\times 10^{-4}}=397.7 N/m^2$

In situation B has greatest pressure.

Answer from: Quest

wanahton purified a portion of water with 900 grams of contaminants. each hour, a third of the contaminants was filtered out.

let g(n) be the amount of contaminants (in grams) that remained by the beginning of the nth hour. g is a sequence, what kind of sequence is it, arithmetic or geometric? then, write an explicit formula for the sequence, g(n)=

wanahton purified a portion of water with 900 grams of contaminants. each hour, a third of the contaminants was filtered out.

explanation:

Answer from: Quest

when [oh-] is 10-5 m, and [h3o+] is 10-9 m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

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Which situation has the greatest pressure? A. Atmospheric pressure at sea level, equal to 1.01 X 105...

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