Sorry, I wish I could help, but I cant. If you go to Khan Academy and search " physics "
it might help :)
A skydiver of mass 81.5 kg (including outfit and equipment) floats downward suspended from her parachute, having reached terminal speed. The drag coefficient is 0.533, and the
area of her parachute is 20.96 m^2
. The density of air is 1.14 kg/m^3
. What is the air's drag
force on her? (Consider the skydiver and the parachute as one system. Take the upward
direction to be positive.)
5 answers
They give you the answer right off so I think you asked the wrong question.
At terminal speed the drag force = the weight = m g = 81.5*9.81 = 800 N
Too easy. They intended to ask for the terminal velocity
Force = (1/2)Cd rho v^2 A = weight = m g
800 =(1/2)(.533)(1.14)(21)v^2
solve for v
At terminal speed the drag force = the weight = m g = 81.5*9.81 = 800 N
Too easy. They intended to ask for the terminal velocity
Force = (1/2)Cd rho v^2 A = weight = m g
800 =(1/2)(.533)(1.14)(21)v^2
solve for v
I did not answer this because I assumed you had done so. Not much of a help :(
I get about 11.2 m/s
thank you so much for helping I really appreciate it because I don't know how to do any of my study guide questions. I don't want just the answer but how you do it to study for a test. My teacher doesn't explain any thing. I wish I could just post all the questions at one but it is too much so I just post one as a time and get different method from various tutors and learn more that way.
0 answers