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alina1380 [7]
2 years ago
7

C. A 75 lb (34 kg) boy falls out of a tree from a height of 10 ft (3 m). (3 points)

Chemistry
1 answer:
KatRina [158]2 years ago
7 0

(I) kinetic energy of the boy when he hits the ground =potential energy

I. e ½mv²=mgh where g is 10ms-²

m=34kg, g=10ms² , h=3m

=34×10×3

=1020j

(i i) v²=u²+2gh

v²=0²+2×10×3

= 60

v=sqrt of 60

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Answer:

pH = 12.33

Explanation:

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The titration reaction is

HA + KOH ---------------------------- A⁻ + H₂O + K⁺

number of moles of HA :   118.3 ml/1000ml/L x 0.3500 mol/L = 0.041 mol HA

number of  moles of OH  : 115.4 mL/1000ml/L x 0.400 mol/L  = 0.046 mol A⁻

therefore the weak acid will be completely consumed and what we have is  the unreacted strong base KOH which will drive the pH of the solution since the contribution of the conjugate base is negligible.

n unreacted KOH = 0.046 - 0.041 = 0.005 mol KOH

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pOH = - log (0.0021) = 1.66

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Note: It is a mistake to ask for the pH of the <u>acid solutio</u>n since as the above calculation shows we have a basic solution the moment all the acid has been consumed.

4 0
3 years ago
What is the difference between the lithosphere and the crust?
Dmitrij [34]

Answer:

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8 0
3 years ago
A 3000 MWt fast reactor has a 42% efficiency. This reactor operates for 23 months followed by a 1 month down time for refueling
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Answer:

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Explanation:

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Cells are too small to see with the naked eye. 

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8 0
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