An engineering team has a goal of developing a bicycle frame that is both lighter and stronger than previous models. Which cost-benefit analysis has

left out potential risks?

A. Better function compared to ecological damage of mining

materials and research and development time

B. Increased sales compared to research and development time and

cost of materials

O C. Increased sales compared to employee stress and loss of natural

resources

D. Better function compared to uncertain supply of materials and

research and development time

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?