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23 Nov 2019
a) At what depth in water is the pressure 37.6 times the pressureat the surface, which is at 1 ATM ?
b) Two stars radiate as black bodies(e = 1). Star A has a radiusthree times as large as star B but a temperature 1/3 that of starB. If star B radiates a power of PB, what is the power PA radiatedby star A?
c) Suppose the heat flow rate through a wall is H. If we double allthe wall dimensions (height, width, thickness) but keep thetemperature difference the same, what would the new heat flow ratebe?
d) A hurricane wind blows horizontally across a 10m X 12m flat roofon a house. Find the wind speed that will produce an upward forceof 2x10^5 Nt on the roof.
( 1ATM = 105 Pa, k = 1.38 x 10-23 J/degK)
a) At what depth in water is the pressure 37.6 times the pressureat the surface, which is at 1 ATM ?
b) Two stars radiate as black bodies(e = 1). Star A has a radiusthree times as large as star B but a temperature 1/3 that of starB. If star B radiates a power of PB, what is the power PA radiatedby star A?
c) Suppose the heat flow rate through a wall is H. If we double allthe wall dimensions (height, width, thickness) but keep thetemperature difference the same, what would the new heat flow ratebe?
d) A hurricane wind blows horizontally across a 10m X 12m flat roofon a house. Find the wind speed that will produce an upward forceof 2x10^5 Nt on the roof.
( 1ATM = 105 Pa, k = 1.38 x 10-23 J/degK)
Jean KeelingLv2
4 Jul 2019
