A square having one unit side, means a side of length 1. There for Pythagorean tells us a^2+b^2=c^2; so 1^2+1^2=c^2. Therefore c=sqrt(2) but the question asks for the square of the diagonal: (sqrt(2))^2=2. Answer: 2
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Ksi-One thousand pounds per square inch
YES, unit step function is periodic because its power is finite that is 1/2.. and having infinite energy.
1 TON of air conditioning requires 400 cubic feet per minute of air movement in the average HVAC system.
An air-conditioning outdoor unit needs to have a free flow of air on both sides of the unit (where the grilles are that the air flows through) in order to operate efficiently. The air needs to be freely moving and cannot be a still pocket of air such as within a solid structure. The unit also needs to be accessible for maintenance and repairs. Check with the manufacturer of the the unit as to how much room is recommended for access to the unit, and how much space is required for airflow. Remember the unit will need replacing at some point. If your deck construction will allow for these factors there should be no problem with building over the unit.
The cross sectional area of a triangular prism is simply the area of the base. The formula for the area of a triangle in one half base times height. Remember that a triangular prism by definition has a triangle for a base.