Can you check this? Samantha swam upstream for some distance in one hour. She then swam downstream the same river for the same d
istance in only 12 minutes. If the river flows at 4 mph, how fast can Samantha swim in still water?
2 answers:
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Answer:
The weight of Earth's atmosphere exert is
Explanation:
Given that,
Average pressure
Radius of earth
Pressure :
Pressure is equal to the force upon area.
We need to calculate the weight of earth's atmosphere
Using formula of pressure
Where, P = pressure
A = area
Put the value into the formula
Hence, The weight of Earth's atmosphere exert is
Answer:
The intensity I₂ of the light beam emerging from the second polarizer is zero.
Explanation:
Given:
Intensity of first polarizer = Io/2
For the second polarizer, the intensity is equal: