Answer:
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Explanation:
Lower pH means that the solution is more acidic
<em>A decrease of two units </em>means that the new solution is <em>100 times more acidic </em>than the original one:
The final equality means that the when the <em>pH decreases two units</em>, the new solution is <em>100 times more acidic</em>.
Use the same when the pH decreases from 7.0 to 4.0, which is three units of decrease:
That means that<em> the acid precipiation (pH = 4.0) is 1,000 times more acidic than pure water (pH = 7.0)</em>
The answer is B, differences in density, I believe.
A substance that is less dense will always stay above a substance that is more dense. The difference in density actually causes the water to move, forming a density current. In the ocean, the deep bottom currents are cooler and more salty than the currents above. Hope this helps, and I would appreciate Brainliest! : )
The crate is in equilibrium. Newton's second law gives
∑ <em>F</em> (vertical) = <em>n</em> - <em>mg</em> = 0
∑ <em>F</em> (horizontal) = <em>p</em> - <em>f</em> = 0
where
• <em>n</em> = magnitude of the normal force
• <em>mg</em> = weight of the crate
• <em>p</em> = mag. of push exerted by movers
• <em>f</em> = mag. of kinetic friciton, with <em>f</em> = 0.60<em>n</em>
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It follows that
<em>p</em> = <em>f</em> = 0.60<em>mg</em> = 0.60 (43.0 kg) <em>g</em> = 252.84 N
so that the movers perform
<em>W</em> = <em>p</em> (10.4 m) ≈ 2600 J
of work on the crate. (The <em>total</em> work done on the crate, on the other hand, is zero because the net force on the crate is zero.)
Answer:
person must have to use the concave lens of focal length 3.5 m
Explanation:
If the person can see upto distance of 3.5 m from eye
then in order to see the object at large distance we need to use
so by lens formula we have
so we have
f = -3.5 m
so person must have to use the concave lens of focal length 3.5 m
Volume=0.09m³
Density=4000kg/m³
Force=?
Density=mass/volume ⇒mass=volume×density
m=0.09×4000=360kg
Force=mass×accelaration
F=360×9.8
F=3528N