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?

Question

sat · Answer

2.4 10

Mat · Answer

Thanks Sat, but can you write your reasoning behind the answer?

Mag · 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) =

mehwish · Answer

please help me what is the solution of above questions.?

mehwish · Answer

please help me if anybody find the solution of above question.

Flaminuous · Answer

Has somebody figured out?

My · Answer

Anybody for Problem 1 and 2?

Neon · Answer

Problem 1 and 2?

rka · Answer

help me plz

Nart · Answer

Problem 1 and 2 please?

gluglu · Answer

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)

FLu · Answer

Thanks gluglu, anyone for last problem in question 1?

Magnum · Answer

Anyone for last question in Problem 1 please?