Define power.

1. (a)(i)Define power.[1]
2. (a)(ii)State what is meant by gravitational potential energy.[1]
3. (b)An aircraft of mass 1200kg climbs upwards with a constant velocity of 45ms⁻¹, as shown in Fig. 3.1. [Figure 3.1] (not to scale) The aircraft's engine produces a thrust force of 2.0 × 10³N to move the aircraft through the air. The rate of increase in height of the aircraft is 3.3ms⁻¹.
4. (b)(i)Calculate the power produced by the thrust force.[2]
5. (b)(ii)1.Determine, for a time interval of 3.0 minutes, the work done by the thrust force to move the aircraft,[2]
6. (b)(ii)2.Determine, for a time interval of 3.0 minutes, the increase in gravitational potential energy of the aircraft,[2]
7. (b)(ii)3.Determine, for a time interval of 3.0 minutes, the work done against air resistance.[1]
8. (b)(iii)Use your answer in (b)(ii) part 3 to calculate the force due to air resistance acting on the aircraft.[1]
9. (b)(iv)With reference to the motion of the aircraft, state and explain whether the aircraft is in equilibrium.[2]

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