The discussion revolves around calculating the force of air resistance acting on a parachutist who falls a certain distance after opening her parachute. The subject area includes concepts of dynamics and forces, particularly focusing on the effects of air resistance during free fall.
Participants are actively engaging with the problem, attempting to clarify the relationship between forces and motion after the parachute opens. Some guidance has been offered regarding the need to calculate deceleration and net force, but there is no explicit consensus on the correct approach or final answer.
There is a mention of the need to convert speed into appropriate units and the importance of understanding the motion dynamics after the parachute opens. Participants are also navigating through potential misunderstandings regarding the calculations of forces involved.
That's the right speed, although mass times gravity has nothing to do with it.SCA said:I got it by doing mass times gravity, The initial speed is 15.29 m/s
You need to calculate the deceleration first.SCA said:Yeah sorry I was answering your question about how I got the first number. Not really, is the deceleration the force of air resistance?
You got the right answer but I'm not sure you know exactly why. You can go ahead and calculate the forces now. But you ought to justify that deceleration value.SCA said:No never mind 3.29 would be the acceleration you use to calculate the net force?
No. That's less than the force due to gravity. Draw a diagram of the forces and you should see what is happening.SCA said:is the end answer 404.86?