A cargo of 50 kg is raised at a steady speed of 0.5ms^-1 for 5s .Suddenly the cable breaks and the crgo falls onto the ground .
a)sketch a graph to show hpw the potential energy of the cargo changes with time in the first 10s . take the ground as the reference level .
b)Estimate the speed of the cargo just before it hits the ground .
A catapult of an aircraft carrier can accelerate an F-18 jet fighter of mass 16000kg from rest to 64ms^-1 with an average acceleration of 32ms^-2 along a straight line . Find the average power delivered to the jet .
- 1 decade agoFavorite Answer
Time for the catapult to accelerate the fighter from rest to 64ms^-1
= (64-0)/32 = 2 seconds
Increase of kinetic energy of fighter from rest to 64ms^-1
= 32768000 J
Therefore, average power delivered from the catapult to the jet fighter
= 32768000J / 2 seconds