What is the specific fuel requirement for flight under vfr at night in an airplane?
a) enough to fly to the first point of intended landing and to fly after that for 45 minutes at normal cruising speed.
b) enough to complete the flight at normal cruising speed with adverse wind conditions.
c) enough to fly to the first point of intended landing and to fly after that for 30 minutes at normal cruising speed.

Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. these cyclotrons typically accelerate h- (the hydride ion, which has one proton and two electrons) to an energy of 5 mev to 20 mev. this ion has a mass very close to that of a proton because the electron mass is negligible—about 1 2000 of the proton’s mass. a typical magnetic field in such cyclotrons is 1.9 t. (a) what is the speed of a 5.0-mev h-? (b) if the h- has energy 5.0 mev and b = 1.9 t, what is the radius of this ion’s circular orbit?