A car's fuel economy is 30 mpg. a warning light is displayed if the remaining distance that can be driven before the car runs ou
2 answers:
Answer:
8.33 gallons
Explanation:
Given: A car's fuel economy is 30 mpg. a warning light is displayed if the remaining distance that can be driven before the car runs out of gas drops below 50 miles.
To Find: initially the car has 10 gallons of gas. how many gallons, g, can be used before the warning light comes on.
Solution:
Total fuel in car
fuel economy of car
fuel required to ride 30 mile
fuel required to ride 1 mile
Now,
Fuel required to ride 50 miles
fuel left in car when warning light is displayed
Amount of fuel that can be consumed before warning light dislays
8.33 gallons fuel can be used before warning light comes on
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Answer:
the thickness of the soap film is 127.82 nm or 130 nm
Explanation:
Given the data in the question;
n = 1.33
λ = 680 nm = 680 × 10⁻⁹ m
m = 1 and β = 0
When we see the red fringe, its a point of maximum reflection
hence, for interference with a thin soap film, we say;
2 × n × d × cos( β ) = ( m - 0.5) × λ
so we substitute in our given values;
2 × 1.33 × d × cos( 0 ) = ( 1 - 0.5) × ( 680 × 10⁻⁹ )
2.66 × cos( 0 ) × d = 0.5 × ( 680 × 10⁻⁹ )
2.66 × 1 × d = 3.4 × 10⁻⁷
d = ( 3.4 × 10⁻⁷ ) / 2.66
d = 127.82 × 10⁻⁹ m
d = 127.82 nm ≈ 130 nm
Therefore, the thickness of the soap film is 127.82 nm or 130 nm