As the moon circles the earth, the shape of the moon appears to change. the shape varies from a full moon, when the earth is between the sun and the moon, to , when the moon is between the sun and the earth.

Why are graphs useful when interpreting data

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?

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*