A control rod made of yellow brass must not stretch more than 18 in. when the tension in the wire is 800 lb. Knowing that E = 15 × 106 psi and that the maximum allowable normal stress is 32 ksi, determine (a) the smallest diameter rod that should be used, (by) the corresponding maximum length of the rod.

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?

What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?