In the 1990s, several studies revealed that corn ethanol had a net energy selector 1lossgainFor example, in dry mill ethanol plants, a total energy of 69,616 Btu (British thermal units, a common energy measurement) is used to produce 1 gallon of ethanol. If ethanol can provide 76,330 Btu per gallon, what is the net energy yield for one gallon of ethanol?73,330 Btu–6,714 Btu1.10 Btu6,714 BtuStill, despite its relatively low net energy yield compared with other fuel energy resources, corn ethanol has largely stayed competitive in the U. S. marketplace because of selector 1its low net energy yieldgenerous government subsidiesits efficient use of croplandHowever, its notable increase in net energy yields in recent years has provided proponents of corn ethanol with reason to keep it in the energy market. Which of the following could have contributed to this notable increase? Check all that apply. Energy consumed to make corn ethanol has been steadily increasing since the 1970s. Corn production per pound of fertilizer has increased steadily since the 1970s.

1134567 a jet with mass m = 1.1 ă— 105 kg jet accelerates down the runway for takeoff at 2 m/s2. 1) what is the net horizontal force on the airplane as it accelerates for takeoff? 2.2*10^5 n your submissions: 2.2*10^5 computed value: 220000submitted: saturday, january 26 at 2: 41 pm feedback: correct! 2) what is the net vertical force on the airplane as it accelerates for takeoff? 0 n your submissions: 0 computed value: 0submitted: saturday, january 26 at 2: 41 pm feedback: correct! 3) once off the ground, the plane climbs upward for 20 seconds. during this time, the vertical speed increases from zero to 21 m/s, while the horizontal speed increases from 80 m/s to 95 m/s. what is the net horizontal force on the airplane as it climbs upward? n 4) what is the net vertical force on the airplane as it climbs upward? n 5) after reaching cruising altitude, the plane levels off, keeping the horizontal speed constant, but smoothly reducing the vertical speed to zero, in 13 seconds. what is the net horizontal force on the airplane as it levels off? n 6) what is the net vertical force on the airplane as it levels off?

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?

Which of the following is an example of motion in two dimensions?