Two wooden planks each in thick and 1 / 2 in. thick and 9 in. wide, are joined by the dry mortise joint shown. knowing that the wood used shears off along its grain when the average shearing stress reaches 1.20 ksi, determine the magnitude p of the axial load that will cause the joint to fail. two wooden members of uniform rectangular cross section of sides a = 100 mm and b = 60 mm are joined by a simple glued joint as shown. knowing that the ultimate stresses for the joint are sigma u = 1.26 mpa in tension and tau u = 1.50 mpa in shear and that p = 6 kn, determine the factor of safety for the joint when (a) alpha = 20degree, (b) 35degree, (c) alpha = 45degree. for each of these values of alpha, also determine whether the joint will fail in tension or in shear if p is increased until rupture occurs.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Apressure vessel with an r/t 20 cannot be treated as thin walled vessel. a)-trune b)- false

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg.m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?