If a concrete member is not subjected to tensile stresses created by the loads, such as a slab on a firm base (ground), does it still need steel reinforcement?
What will be an ideal response?
Yes, because concrete shrinks as the water held within it evaporates. This causes tensile stresses in concrete and concrete cracks. Therefore, some steel is necessary, referred to as shrinkage steel.
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Which of these statements about modern mass air flow sensors is true?
A. The sensor alters a reference voltage. B. The sensor uses a hot wire for sensing air temperature. C. The sensor produces a digital signal. D. The sensor uses voltage to sense air flow.
Determine all reactions. The pin joint at D acts as a hinge.
The Environmental Protection Agency and the Occupational Safety and Health Administration aroused bitter opposition among many business people because
A. they undermined strong efforts that businesses were already making to protect the environment and worker safety. B. the agencies were financed by new corporate business taxes. C. most business leaders were hostile to improvements in the environment or safety. D. they directly involved the federal government in many aspects of business decision making. E. they operated under laws passed by an antibusiness administration.
One of the most common grounding systems used for protection against accidental electrical shock is the
_____. a. two-wire system b. three-wire system c. four-wire system d. five-wire system