Complex loading (bending and compression)

A steel chimney is 28m high, 1.4m external diameter, and 20mm thick. It is rigidly fixed at the base and is acted upon by a horizontal wind pressure of intensity 1.1KN/m2 on the projected area. The steel weighs 74KN/m length. Calculate the maximum stress in the chimney at the base.

Problem with a hoist drum.

A hoist drum consists of a uniform cylinder of diameter 1.2m, radius of gyration 0.45m and mass 200kg. It is being used to lower a crate of mass of 60 kg which is attached to the hoist by a light, inextensible rope. Initially, the crate is at rest 3.0 m above the ground. A brake on the drum is accidentally partially released and the crate accelerates uniformly, reaching the ground after 2.20 seconds. Determine (a) The linear acceleration of the crate. (b) The angular acceleration of the drum. (c) The tension in the cable. (d) The moment of inertia of the hoist drum. (e) The friction torque from the brake on the drum.

Mechanical Engineering Problems

Engineering Mechanics 1) The horizontal bar represented in figure is acted upon by the four vertical forces f1,f2,f3, and f4, whose location and characteristics are shown. Calculate the horizontal distance from point O at the base of F4 and horizontal line to the line of action of the resultant of the given forces. F1=400lbs, F2=3500lbs, F3=4500lbs , F4=3000lbs Between F1 and F2 is 6ft,between F2 and F3 is 6 ft, Between F3 and F4 is 8ft F1 F2 F3 F4 2) A railroad car that weighs 20,000 lb is traveling eastward with a velocity whose magnitude is 5fps. A second car, on the same track, that weighs 40,000 lbs also traveling in an easterly directi... click for more

Stress and Loads

The cross section of the beam AD in Question 1 (attached). 1. Knowing the allowable normal stress due to bending +110 MPa in tension and –150 MPa in compression find the largest permissible value load W if beam AB not to be overstressed. See attached file for full problem description.

For the Pratt bridge truss and loading shown, determine the average stress in member BE, knowing that the cross-sectional area of that member is 3250 mm2.

For the Pratt bridge truss and loading shown, determine the average stress in member BE, knowing that the cross-sectional area of that member is 3250 mm2. a) 69.23 MPa b) 72.15 MPa c) 65.82 MPa d) 56.34 MPa