1. what problems are to occur if a concrete has too low of a slump? 2. explain the differences between reinforcing and prestressing and the relative advantages and disadvantages of each. 3. what are control joints and isolation joints? explain the purpose and typical locations of each in a concrete slab. 4. explain the role of stirrups in beams. 5. why are precast concrete structural members usually cured with steam? 6. describe the following key terms and concepts: a. self-consolidated concrete b. lift-slab construction c. column tie d. waffle slab e. double tee

The force on a cutting tool are 2600n vertically downward and 2100 horizontal. determine the resultant force acting on the tool and the angle at which it acts.

Vibration monitoring this technique uses the noise or vibration created by mechanical equipment and in seme cases by plant systems to detemine their actual condtion. a)- true b)- false

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.