Answer :
Final answer:
The net impulse on a VTOL aircraft exerting a vertical force of 981 kN over 10 seconds is calculated by multiplying force by time, resulting in an impulse of 981 kNs. The correct option is c.
Explanation:
The question involves calculating the net impulse exerted on a VTOL aircraft during hover over a certain time period. The impulse of a force is the product of the force and the time period over which it acts. The formula to determine impulse (I) is given by:
I = Force (F) × Time (t)
Given that the vertical force exerted by the jet engines is 981 kN and it acts over a time interval of 10 seconds, we can calculate the impulse as follows:
I = 981 kN × 10 s
It is important to ensure that the units are consistent when performing the calculation. Here, we have kN (kilonewtons) for force and seconds for time, which gives us the impulse in kiloNewton-seconds (kNs). So, the impulse would be:
I = 9810 kNs
This is equivalent to 9810 kNs, or 9810×103 N×s, which is equal to 9810 Ns after converting kilonewtons to newtons by multiplying by 1000. Therefore, the correct answer is C) 981 kNs.
