Why does a satellite in a circular orbit travel at a constant speed? a) the net force acting on the satellite is toward the center of the path.
b) there is a component of the net force acting in the direction of the motion of the satellite.
c) there is a force acting opposite to the direction of the motion of the satellite.
d) there is no component of the net force in the radial direction.
e) the gravitational force acting on the satellite is balanced by the centrifugal force acting on the satellite.

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*