4.22
Explanation:
The most acidic rainfall in New York State will have pH of 4.22 whereas the least acidic will be that of 4.40.
The pH scale expresses the acidity or alkalinity of aqueous solutions.
- The pH scale ranges from 1 to 4
- An acidic solution will have a pH value less than 7
We have given a range of values between 4.22 to 4.40
This implies that the pH values of rainfall in this region falls between these extremes.
The least value 4.22 is the most acidic
The value 4.4 is the the least acidic
The lower the pH value, the more acidic a solution is.
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Answer:
Same work is done by the two workers
The first worker exerts more power than the second person
Explanation:
Work is the product of force and distance moved in the direction of the applied force
Power is the rate at which work is done
Visible light waves are the only electromagnetic waves we can see has the longest wavelength
The minimum power is 490 W
Explanation:
The work that needs to be done by the robot in order to climb the shelves is equal to the gain in gravitational potential energy of the robot + object, therefore:

where
m = 15 kg + 5 kg = 20 kg is the total mass of the system
is the acceleration of gravity
is the change in height
Substituting,

Now we can calcualte the power (wattage) that the robot must have, using the equation

where
W = 3,920 J is the work done
t = 8 s is the time interval
Substituting,

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You probably know this equation giving the power dissipated:
P = IV
P = power, I = current, V = applied voltage
We can substitute I = V/R from Ohm's law:
P = V²/R
Given values:
V = 30.0×10³V, R = 0.40Ω/km×34.0km = 13.6Ω
Plug in and solve for P:
P = (30.0×10³)²/13.6
P = 6.62×10⁷W