1) A HYPOSTATIC structure: a) Is a structure fixed with more than the strictly necessary number of constraints; b) Is a statically determinate structure; c) Can be hyperstatic if the constraints are ill-disposed. II) Given the following system of beams, the vertical displacement component of the cross section in A, via Mohr's Theorem and Corollaries, yields: 38 a) 1 ML 2 EJ 1: b) 11 1 ML2 c) None of the others. III) The nucleus of inertia of a cross section is the region in the plane of the cross section: a) Such that, if the centre of pressure of an axial force N falls inside, then there is not bending; b) Such that, if the centre of pressure of an axial force N falls inside, then the σ, diagram is supposed to be partially in tension and partially in compression; c) That changes in geometry if the cross section is made of a material not resistant to tension stresses.

During a dunk, a basketball player will elevate theircenter of mass 70 cm (or more) while jumping off of one leg. What is the strain energy contribution to the energy required to elevate the center of mass given the following parameters? How much energy has to be contributed by active muscle contraction? mass = 82 kg, K leg = 35000N/m, dispacement = 0.11 m.

Modern commercial airliners are largely made of aluminum, a light and strong metal. But the fact that aluminum is cheap enough that airplanes can be made out of it is a bit of historical luck. Before the discovery of the Hall-Héroult process in 1886, aluminum was as rare and expensive as gold. What would happen if airplanes had to be made of steel? The fuselage of the Boeing 747, which can carry 400 passengers, is approximately a hollow aluminum cylinder without ends, 70.7 m long, 6.5 m wide, and 2.5 mm thick (see sketch at right). The fuselage of an airplane Suppose this fuselage was made of steel (density 7.87 g/cm³) instead of aluminum (density 2.70 g/cm³), and let's say the average passenger has a mass of 79 kg. We'll also assume the engines can't lift any greater mass than they already do. Calculate the number of passengers that the Boeing 747 could carry if its fuselage was made of steel. 0 X

A high-carbon steel with a fully pearlitic microstructure was used to form a high-strength bolt (H.-C. Lee et al., J. Mater. Proc. Tech. 211, 1044 (2011)). It was found that the bolt head had an average interlamellar spacing of 257 nm whereas the average spacing in the body of the bolt was 134 nm. Assuming that dislocation pileup is the primary mechanism responsible for the strength of this alloy, what ratio of strength (or hardness) might be expected in the head and body of the bolt?