Final answer:
To calculate the induced emf on a jet airplane's wingspan while flying, the magnetic field strength must be known in addition to the given wingspan and velocity, applying Faraday's Law of electromagnetic induction.
Step-by-step explanation:
The question involves calculating the electromotive force (emf) induced in the wings of a flying airplane. According to Faraday's Law of electromagnetic induction, a moving conductor in a magnetic field will have an emf induced across it proportional to the velocity, the magnetic field strength, and the length of the conductor perpendicular to the field. Using the formula E = Bvl, where E is the emf, B is the magnetic field strength, v is the velocity of the airplane, and l is the length of the wingspan, we can calculate the induced emf.
Considering the provided data, with a wingspan (l) of 75.0 meters and a velocity (v) of 280 m/s, the calculation requires the magnetic field strength (B), which is not given in this case. Assuming we had B, the emf (E) induced between the wingtips could be calculated using the formula by substituting in the given values for l and v, and the known value for B, commonly taken as Earth's magnetic field, which is roughly 1x10-4 Tesla.