The seasons are caused by the precession of the Earth's axis
Indicate whether the statement is true or false
F
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During the inflation that started at about 10^-37 seconds after the Big Bang, the universe expanded by:
a. up to 10^50 in as little as 10^-47 seconds. b. up to 10^42 in as little as 10^-40 seconds. c. up to 10^30 in as little as 10^-36 seconds. d. by about a factor of 10 up to the present time. e. by no significant amount.
Hot water is used to heat air in a double pipe heat exchanger as shown in the following sketch. If the heat transfer coefficients on the water side and on the air side are 550 W/(m2K) and 55 W/(m2 K), respectively, calculate the overall heat transfer coefficient based on the outer diameter. The heat exchanger pipe is 5 cm, schedule 40 steel (k = 54 W/m K), with water inside.
GIVEN
• A double pipe heat exchanger with water in inner tube and air in the annulus
• Heat transfer coefficients
? Water side ih = 550 W/(m2 K)
? Air side oh = 55 W/(m2 K)
• Inner pipe: 5 cm, schedule 40 steel
• Pipe thermal conductivity (k) = 54 W/(m K)
FIND
• The overall heat transfer coefficient based on the outer diameter (Uo). ASSUMPTIONS
• Uniform heat transfer coefficients
SKETCH
PROPERTIES AND CONSTANTS
for 5 cm, schedule 40 pipe
? Outside diameter (Do) = 2.375 in = 6.033 cm=0.0603 m
? Wall thickness (t) = 0.154 in=0.39 cm=0.0039 m
The two types of reflection are ______________ and ___________
Fill in the blank(s) with correct word
According to Copernicus, retrograde motion for Venus must occur around:
A) inferior conjunction, when it passes between us and the Sun. B) quadrature, when the planet is 90 degrees away from the Sun. C) greatest elongation, when the planet is farthest from the Sun. D) superior conjunction, when the planet is on the far side of the Sun. E) opposition, when the planet lies opposite the Sun in the sky.