What type of galaxy are the two Magellanic Clouds? How do we know this visually?
What will be an ideal response?
Both are irregular galaxies, without the structure of either spirals or ellipticals, but with much visible gas and dust and new star formation typical of spiral arms.
You might also like to view...
Most of the galaxies in the Local Group are:
A) big spirals like our Galaxy and M31. B) small spirals like M33 and the LMC. C) small irregulars like the Magellanic Clouds. D) active galaxies like Centaurus A. E) small ellipticals like the companions to M31 in Andromeda.
Which of the following best describes what we mean by a worm hole?
A) A proven way of traveling through space faster than the speed of light. B) A possible method of traveling through space faster than the speed of light. C) A discarded idea about time travel that physicists now know to be impossible. D) A hypothesized but unproven type of "tunnel" through hyperspace that connects distant points in the real universe.
An object is placed 10 cm to the left of a converging spherical lens. The lens has a focal length of f = 5 cm. Where is the image formed?
a. 3.3 cm to the left of the lens b. 3.3 cm to the right of the lens c. 10 cm to the left of the lens d. 10 cm to the right of the lens
If the total resistance between the steam and the air (including the pipe wall and scale on the steam side) in Problem 7.36 is 0.05 m2 K/W, calculate the temperature difference between the outer surface of the inner pipe and the air. Show the thermal circuit.
GIVEN
Atmospheric flow through an annulus with steam condensing in inner tube
Diameters Inside
(Di) = 25 cm = 0.25 m
Outside (Do) = 38 cm = 0.38 m
Steam temperature (Ts) = 149°C
Air velocity (V) = 6 m/s
Total resistance between the steam and air (At Rtot) = 0.05 (m2 K)/W
Air bulk temperature (Tb) = 38°C
From Problem 7.36 heat transfer coefficient on the outer surface of the inner pipe (c h) = 25.4 W/(m2 K)
FIND
The temperature difference between the outer surface of the inner pipe and the air (?T)
ASSUMPTIONS
Steady state
Steam temperature is constant and uniform
Heat transfer to the outer surface is negligible
Air temperature given is the average air temperature
Thermal resistance of inner tube wall and condensing steam is negligible (Inner tube wall surface
temperature = Ts)
SKETCH
