Answer:
Explanation:
Point beneath you forms a beautiful iridescent green
refractive index of Gasoline 
Wavelength of Green light is 
Here light first traverse from air(n=1) to gasoline , it reflects from front surface of gasoline(n=1.38) so it suffers a phase change. After this light reflect from rear surface of gasoline and there is a decrease in refractive index(n=1.38 to n=1.33), so there is no phase change occurs .
For constructive interference
here t= thickness of gasoline film
n=refractive index
for 
Answer:
1,373.4 N
Explanation:
The mass of the table acts at the centre in addition to the books since that is the centre of gravity of the table.
Mass of books will be 10kg+20kg+30kg=60 kg
Total mass of table and books will be 500kg+60kg=560 kg
This mass is evenly distributed into the four legs hence 560kg/4 legs=140 kg per leg
Force is product of mass and acceleration due to gravity hence F=gm
Taking g as 9.81 m/s2 then
F=140*9.81=1,373.4 N
Therefore, rhe normal force is equivalent to 1,373.4 N
Answer:
Explanation: relationship between the object and the observer's frame of reference.
Batteries are connected when the terminal voltage across each of them was measured because batteries have an internal resistance that is in series with the load.
<h3>What is a chemical reaction?</h3>
A chemical reaction is a process in which one or more substances, also known as reactants are converted to one or more different substances, known as products. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products
In batteries, the chemical energy is converted into electrical energy with help of a chemical reaction happening inside the battery.
Batteries and other power sources have an internal resistance that runs parallel to the load. The overall resistance of the path of the electron flow inside the source constitutes the internal resistance, which is not technically a resistor. Usually, internal resistance is extremely minimal.
Thus, considering the internal resistance of the batteries, the terminal voltage across each of them was measured.
Learn more about chemical reactions here
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