What is the magnitude of the maximum stress that exists at the tip of an internal crack having a radius of curvature of 3.5 × 10-4 mm (1.378 × 10-5 in.) and a crack length of 4.5 × 10-2 mm (1.772 × 10-3 in.) when a tensile stress of 170 mpa (24660 psi) is applied?

Given:

applied tensile stress, = 170 MPa

radius of curvature of crack tip,   =   mm

crack length = mm

half of internal crack length, a =

a =  

Formula Used:

Solution:

Using the given formula:

= 2726 MPa (395372.9 psi)

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.