Q1/ A structural part is 1-meter-long and subjected to a 50 KN load in which this part must be deformed elastically without experiencing any permanent deformation. If you know that part is made of steel, brass, aluminum, and Titanium alloys and the yield strengths and densities of these alloys are: 860 MPa, 7.9 g/cm³; 415 MPa, 8.5g/cm³; 310 MPa, 2.7 g/cm³; and 550 MPa, 4.5 g/cm³ respectively. Based on these criteria, rank the alloys from the heaviest to the lightest in weight.

When rebuilding his car's engine, a mechanic must exert 300'N of force to insert a dry steel piston into a steel cylinder. What is the magnitude of the normal force between the piston and cylinder? (b) What is the magnitude of the force would he have to exert if the steel parts were oiled? (us for dry steel on steel = 0.6; µk for dry steel on steel = 0.3; us for oiled steel on steel = 0.05; µk for oiled steel on steel = 0.03)

A sectional steel cable of 3.00 cm2 has a mass of 2.40 kg per meter. If the cable is  500 m long hanging on a vertical cliff, how far the cable is stretched due to  weighs itself? Known young steel modulus 2.00 x 10¹¹ N/m2 .  (b). If there are two climbers hanging on the cable, determine how far  cable is stretched. The mass of climbers is 60 kg and 70 kg, respectively.

3. Two specimens with the same dimensions and made from two different materials, A and B, were subjected to tensile testing. The percentage reduction in the area of the specimen made of material 'A' was calculated 3 times that of the specimen made of material B. In this case, O A lthe ductility of material A and B is equal O Bthe material A is brittle and material B is ductile O Cthe material B is more ductile than material A O D nhe material A is more ductile than material B 1. 20 O Aramak için buraya yazıin

"Suppose someone with a body weight of 75 kg is lifting a box weighing 15 kg. If their back forms an angle of 70 degrees with the horizontal plane, and the distance from the object to the center of their body is 0.5 cm. The questions are as follows: 1. Create a free-body diagram for the above condition and apply the sign convention for forces and moments. 2. Calculate the magnitude of the compression force (F compression) and the shear force (F shear) generated. 3. Analyze whether this job is safe to perform."

Larger animals have sturdier bones that smaller animals. A mouse’s skeleton is only a few percent of its body weight, compared to 16% for an elephant. To see why this is so, consider a 70 kg man standing on one leg. The cross sectional area of his femur is 4.8x10-4 m2. Bone has a compressive strength of 1.00 x 108 N/m2. Please answer/label each part of the question clearly a, b, c etc a. What maximum force can act on his femur? (Give your answer in kN.) b. How many times greater is this force than the man’s weight? c. Now consider a giant man scaled up by a factor of 10 in all dimensions. What maximum force can act on the scaled up femur? (Give your answer in kN.) d. The man’s body will increase by a factor of 10 in each dimension. What will be his new weight? (Give your answer in kN.) e. If the scaled up man now stands on one leg, how many times greater is the maximum force than the man’s increased weight?

Mechanics of materials I

An engineer determines that a 32 cm long rod of 1020 grade steel will be subjected to a tension of 40 kN. The following two design requirements must be met: the stress must remain below 120 MPa, and the rod must stretch less than 0.135 mm. Determine an appropriate value for the rod's diameter to meet these two requirements. (Round up to the nearest millimeter when reporting your answer.) mm

For many viscous materials, the viscosity n may be defined in terms of the expression deldt where o and dɛ/dt are, respectively, the tensile stress and the strain rate. A cylindrical specimen of a soda-lime glass of diameter 6 mm (0.24 in.) and length 250 mm (9.9 in.) is subjected to a tensile force of 9 N (2.02 Ib;) along its axis. If its deformation is to be less than 1.7 mm (0.067 in.) over a week's time, using Figure 13.14, determine the maximum temperature to which the specimen may be heated.

A long metal plate (E = 210 GPa) with some cutouts in it is mounted between two rigid plates at 6 am. By noon, the temperature has risen by 20°C. The structure is made from aluminium with a coefficient of thermal expansion of a = 23 x 10-6/°C. Please use the stress concentration chart shown below for any relevant calculations. a10 h L b O Use the following values in your working out: K 3.2 3.0 2.8 2.6 2.4 2.2 2.0 L = 13 m 0 0.1 P 0.2 W W Javg 0.3 2r P (w2r)t 0.4 P ▬▬▬▬▬▬▬ 0.5 h = 5.3 m a = 0.8 m b = 1.6 m a) What is the average normal stress throughout the plate at noon? b) What is the maximum stress at any point in the structure? c) The material the plate is made from has a tensile yield stress of 416 MPa and a compressive yield stress of 200 MPa. Using these values, do you expect the plate to yield at/before noon?