_________ are neutron stars that have magnetic fields 100 times stronger than the average neutron star
a. Hypernovae
b. Collapsars
c. Pulsars
d. Kerr singularities
e. Magnetars
e
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The Balmer Beta absorption line is a result of a transition of an electron in a hydrogen atom from:
A) level 2 to level 3. B) level 2 to level 4. C) level 3 to level 2. D) level 4 to level 2. E) None of the above.
The fast, downslope movement of large blocks of weathered materials is called a(n) ______________
Fill in the blank(s) with correct word
How are dwarf planets different from planets?
What will be an ideal response?
Engine oil flows at a rate of 0.5 kg/s through a 2.5-cm-ID tube. The oil enters 25°C while the tube wall is at 100°C. (a) If the tube is 4-m-long. Determine whether the flow is fully developed. (b) Calculate the heat transfer coefficient.
GIVEN
• Engine oil flows through a tube
• Mass flow rate (m
) = 0.5 kg/s
• Inside diameter (D) = 2.5 cm = 0.025 m
• Oil temperature at entrance (Ti) = 25°C
• Tube surface temperature (Ts) = 100°C
• Tube length (L) = 4 m
FIND
(a) Is flow fully developed? (b) The heat transfer coefficient (hc) ASSUMPTIONS
• Steady state
SKETCH
