Aspring-damper system is designed to support an electric motor which has a total mass of 20 kg and an unknown rotating imbalance. in free vibration, a displacement of 16 mm is damped to 1 mm in two cycles. determine the required spring stiffness so that only 20% of the vertical component of the unbalanced force is transmitted to the ground when the motor is running at 1,200 rpm, assuming the damping ratio remains constant.

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.