Using an unmanned rocket to visit the space station requires 85.2 trillion BTU of energy. The best fuel for the mission will hav
e the highest ratio of energy to volume. Based on the fuel data presented in the table, select the optimal fuel and calculate the total gallons of fuel required. Table: Energy Output BTU/lb Density g/ml
Kerosene 18,500 0.820
Gasoline 20,900 0.737
Ethanol 11,500 0.789
Hydrogen(l) 61,100 0.0710
Which is the optimal fuel?
How many gallons of fuel are required?
Conversion units:convert energy output to BTU/gal
i need help please
We shall convert all of the densities to lbs/gal, so the product of BTU/lbs and lbs/gal gives us the basis of comparison, which was "ratio of energy to volume". grams / ml x 1 lbs/454 grams → 1 lbs/ 454 ml 1 lbs/454 ml x 3785.41 ml/gal → 3785.41 lbs/454gal Conversion of g/ml = 8.34 lbs/gal Looking at each fuel:
Kerosene: 18,500 x (8.34 x 0.82) = 126,517 BTU/gal
Gasoline: 20,900 x (8.34 x 0.737) = 128,463 BTU/gal
Ethanol: 11,500 x (8.34 x 0.789) = 75,673 BTU/gal
Hydrogen: 61,000 x (8.34 x 0.071) = 36,120 BTU/gal
The best fuel in terms of energy to volume ratio is Gasoline. Gallons required: BTU needed / BTU per gallon = 85.2 x 10⁹ / 128,463 = 6.6 x 10⁵ gallons
When someone is struct by lightning, the electricity passes through the body, into the earth. Here, our body acts as a lightning conductor to complete the earthing process.
Winds tend to rotate in a counter clockwise direction in the center of northern and southern hemisphere.
Explanation:
The wind blows clockwise around a high pressure area in the northern hemisphere and the wind blows counter - clockwise around low pressure.
In the northern hemisphere High-pressure systems rotate clockwise direction and in the southern hemisphere low-pressure systems rotate clockwise direction.
