Question

1. a jumbo jet cruises at a constant velocity when the total thrust of the engines on the jet is 30,000 n. how much air resistance acts on the jet?

67890 n in the opposite direction of the jet
9.81 n in the same direction as the jet
30,000 n in the opposite direction of the jet
30,000 n in the same direction as the jet

Explanation:

When an object moves at a constant velocity, the net force acting on it is zero according to Newton's first law. The thrust of the engines and the air resistance are the two forces acting on the jet. Since the net force \(F_{net}=F_{thrust}-F_{air - resistance}=0\) (because \(v = constant\), \(a = 0\) and \(F_{net}=ma\) with \(m
eq0\) and \(a = 0\)), then \(F_{air - resistance}=F_{thrust}\). Also, the air - resistance acts in the opposite direction of the motion (opposite to the thrust direction) to oppose the motion.

Answer:

30,000 N in the opposite direction of the jet.