Answer:
(a) It depends on what cruising speed and cruising altitude
(b) [tex] 7654.5 * 10^6 (J)[/tex]
(c) [tex] 21425.04 * 10^6 (J) [/tex]
Explanation:
Formula for Kinetic energy: [tex] E_k = \frac{mv^2}{2}[/tex]
Formula for Potential energy [tex] E_p = mgh [/tex]
(a) It actually depends on cruising speed and cruising altitude to tell which one requires more energy. However, cruising speed would have more impact than cruising altitude because it has a power of 2 in the energy formula.
(b) If we plug in v = 270 and m = 210000 to the Kinetic energy formula we should have
[tex] E_k = \frac{210000 * 270^2}{2} = 7654.5 * 10^6 (J)[/tex]
(c) If we plug in h = 10.4 km = 10400 m, m = 210000 and g = 9.81 we should have
[tex] E_p = 210000 * 9.81 * 10400 = 21425.04 * 10^6 (J) [/tex]
