A preheater involves the use of condensing steam at 100^{\circ} \mathrm{C}100 drgrees Celsius on the inside of a bank of tubes to heat air that enters at 1 atm and 25^{\circ} \mathrm{C}25 degrees Celsius. 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. The bank consists of 196 tubes in a square, aligned array for which S_{T}=S_{L}=15 \mathrm{mm}S
T=SL=15mm. What is the total rate of heat transfer to the air? What is the pressure drop associated with the airflow?

f=gm1m2/d^2 it d

f is force g is gravitaiton constant, m1 is mass of first object, m2 is mass of second object. d is distance between two object

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

neither accurate nor precise.

the force represented by vector a is normal force. if the hockey puck is moving to the right, when it is hit with a significant force by the hockey stick the puck will move off in a different direction. correct on edge.