You are a thief and you want to lower yourself from the rooftop to a second floor window, which is at a distance H=12m below the tip of the roof. You want to use a nylon rope, which has a failure stress of 400 MPa, and a Young’s modulus of 1 GPa. If you weigh 225 lb, what diameter rope, Dmin, should you choose if you want a safety factor of 2 against failure?
2.4
10
Thanks Sat, but can you write your reasoning behind the answer?
Rotating blade (body force in axial loading)
A blade is fixed to a rigid rotor of radius R spinning at omega rad/sec around the vertical z-axis (see figure). Neglect the effects of gravity.
Calculate the peak stress in the blade: sigma_max_n
Calculate the blade elongation: delta
Calculate the displacement of the blade mid-section: u_x(L/2)
sigma max n =
delta =
u_x(L/2) =
please help me what is the solution of above questions.?
please help me if anybody find the solution of above question.
Has somebody figured out?
Anybody for Problem 1 and 2?
Problem 1 and 2?
help me plz
Problem 1 and 2 please?
rho*omega^2*(R*L+L^2/2)
(rho*omega^2/E)*(L^3/3+L^2*R/2)
(rho*omega^2/E)*(11*L^3/48+3*L^2*R/8)