When driving, always keep your eyes moving. This statement means to

A. scan the road for potential hazards
B. quickly glance at your blind spot, then return your sight forward
C. quickly look in the mirrors, at the speedometer, and at the gas gauge every five to 10 seconds
D. perform all of the above

Apreheater involves the use of condensing steam at 100°c on the inside of a bank of tubes to heat air that enters at 1 atm and 25°c. the air moves at 5 m/s in cross flow over the tubes. each tube is 1 m long and has an outside diameter of 10 mm. what is the minimum value of nl needed to achieve an outlet temperature of t 75 c? what is the corresponding pressure drop across the tube bank?