During a tensile test, the strain corresponding to a stress of 5000psi was 167uin/in. at 20,000psi, the strain was 667uin/in. a. if the proportional limit is 30,000psi, what is the modulus of elasticity (young's modulus) for the specimen being tested? b. what stress corresponds to a strain of 200uin/in? c. will the result from part b still hold if the proportional limit is 18,000psi? explain your an answer

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?