1. Draw from memory a detail of a typical slab on grade and list the steps in its production. Why can't the surface be finished in one operation, instead of waiting for hours before final finishing?2. What are control joints and isolation joints? Explain the purpose and typical locations for each in a concrete slab.3. List the steps that are followed in forming and pouring a concrete wall.4. Distinguish one-way concrete framing systems from two-way systems. Are steel and wood framing systems one-way or two-way? Is one-way construction more efficientstructurally than two-way construction?5. List the common one-way and two-way concrete framing systems and indicate the possibilities and limitations of each.6. Why posttension a concrete structure rather than merely reinforce it?

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?