Which statement is true about the future of space travel? a. The United States will be the only country with a presence in space.
b. There are no plans to create a habitat for people to live in space.
c. We have reached our limit of where we can travel in space.
d. Plans are underway to determine sustainable plans for humans in space.

Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk