Digital information is converted and transmitted in certain numbers that create a pattern. Analog data is transmitted in continuous waves. Old records contain analog data but can be converted to digital recordings. Which of these statements best describes how digital data compares to analog data?
A. Digital data takes more space to store than analog does.
B. Digital data transmits signals more slowly than analog can.
C. Digital data can be stored for a longer period of time than analog can.
D. Digital data records more unwanted background noise than analog does.

Work = force × a. work b. energy c. distance d. momentum

Asteel tube (k=50 w/mk) of inner and outer diameter di = 20mm and do=26mm, respectively, is used to transfer heat from hot gases flowing over the tube (h-hot = 200w/m2k) to cold water flowing through the tube (h-cold = 8000 w/m2k). what is the cold-side overall heat transfer coefficient uc? to enhance heat transfer 16 straight fins of rectangular profile are installed longitudinally along the outer surface of the tube. the fins are equally spaced around the circumference of the tube, each having a thickness of 2mm and a length of 15mm. what is the corresponding overall heat transfer coefficient uc? *solve for uc in both cases*

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?