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- A long steel I-beam used in bridge construction has a length of 15.0 m. The beam may be exposed to temperatures as low as −22°C in the winter and as high as 33°C in the summer. What is the difference in length of the beam between these two temperature extremes? (Give the absolute value of the difference. Enter your answer in mm.)Density of stainless steel= 7860 kg/m^3If the density of a liquid is 835 kg/m3 find its specific weight and specific gravity
- STRENGTH OF MATERIALS What will be the elongation due to self-weight of 6m suspended steel rod 20mm diameter weighing 100N. Assume E = 210MPa.Figure 2 shows an assembly made of a steel tube of internal and external diameter of 20 mm and 30 mm respectively, brass and copper bars, each having 25 mm of diameter. The three materials have equal length of 500 mm and are symmetrically rigidly fixed at the upper end while being joined by a horizontal collar (with negligible mass) at their bottom end. An application of a vertical downward load P on the assembly, results in storing a total of 20 J of energy. The moduli of elasticity for steel, brass and copper materials are ESt=200 GPa, EBr=100 GPa and ECu=80 GPa, respectively. Calculate 1. The load P if it is applied gradually.2. The load P if it is applied suddenly.3. The impact load P that falls from a height of 200 mm above the collar.The diagram shows view of a suspension bridge.The road is supported by cylindrical steel rods attached to the suspension cables.There are 2 identical cables and sets of rods on each side of the roadway. Each pair of rods effectively supports 5m of road which has a mas per unit length of 2 x 103 kg/m.The longest rods are 55m long and have a cross-sectional area of 5 x 10-3 m2. young’s modulus for steel 2 x 1011 Pa Assuming that the limit of proportionality is not exceeded, calculate: The tension in each rod The tensile stress in the longest rods The tensile strain in the longest rods i) what changes will occur in a rod when a lorry goes over the bridge? ii) Explain why the rods used in bridges may fail due to metal fatigue.
- The specific weight of a certain liquid is 90.30 lb/ft3. Determine its density and specific gravity.Determine the mass moment of inertia of the assembly about the z axis. The density of the material is 7.85 Mg/m3.A 4-m-long steel plate with a rectangular cross section (10 mm * 50 mm) is resting on a frictionless surface under the sun. The plate temperature is measured to be at 40°C. The plate is then moved into a cold room and is left to rest on a frictionless surface. After several hours, the plate temperature is measured to be at 5°C. The steel has a modulus of elasticity equal to 200,000 MPa and a coefficient of thermal expansion equal to 1.1 * 10-5m/m/°C.a. What is the length of shrinkage?b. What tension load is needed to return the length to the original value of 4 meters?c. What is the longitudinal strain under this load?
- the wheel on a grinder is uniform 900-g disk of 8-cm radius. it rotates uniformly to rest from 1400 rpm in time of 35 seconds. determine the torque that slows its motionA tank having a volume of 0.85 m3 initially contains water at 260 oF and x = 0.7. Saturated vapor is slowly withdrawn at the top of the tank as energy is transferred by heat to maintain constant pressure. The process continues until the tank is filled with just saturated vapor. Determine the heat transferred in kJ. Show all your calculations.The specific weight of glycerin is 78.6 Ib/ft'. Compute its density and specific gravity. What is its specific weight in kN/m?