Ultrasonic sensors evaluate attributes of a target by interpreting the echoes from sound waves.
Answer the following statement true (T) or false (F)
True
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Determine the resultant vector in standard position for the following vectors and express the magnitude to 3 significant digits and the angle to the nearest tenth degree. 
= 8.72 km at 206.0°, 
= 2.14 km at 166.6°, 
= 7.00 km at 107.3°
Fill in the blank(s) with the appropriate word(s).
Why does compressed air require a dryer?
A) To remove residual moisture that may have entered the air lines during installation B) Compressing air tends to cool it off, causing water to begin condensing. C) Some small amounts of water from the water jacket cooling the air compressor enter the compressed air. D) To dehumidify the air
A rain-sense wiper system uses a rain sensor that is usually mounted ________
A) Behind the grille B) On the roof C) Outside of the windshield at the top D) Inside of the windshield at the top
The principal difference between plain-carbon steels and HSLA steels is _____
a. magnetic properties b. weldability c. the addition of alloys d. porosity resistance