Where was supernova 1987a located?
A) in the Orion Nebula, M-42
B) in Sagittarius, near the Galactic Nucleus
C) in our companion galaxy, the Large Magellanic Cloud
D) in M-13, one of the closest of the evolved globular clusters
E) near the core of M-31, the Andromeda Galaxy
C
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The lowest-strength direction and loading for a uniaxial-fiber reinforced composite materials is
(a) In the fiber plane shear (b) Axial compression (c) Transverse tension (d) Transverse compression
Why did terrestrial planets form in the inner solar system and jovian planets in the outer solar system?
A) As the solar nebula shrank, it settled into a spinning disk and separated into individual planets. B) Denser, heavier materials, such as rocks and metals, settled to the center of the nebula, and therefore, planets that formed there were more likely to be made primarily from rock and metal. C) In the inner part of the nebula, only metals and rocks were able to condense because of the high temperatures, whereas hydrogen compounds, although more abundant, were only able to condense in the cooler outer regions.
The celestial sphere appears to move fastest above the ________
Fill in the blank(s) with correct word
A train moving 30. m/s approaches a station and sounds its whistle and passengers standing at the station hear a pitch of 440. cycles/second. What pitch will be heard when the train is at rest at the station? (assume the air temperature is 20.°C)
What will be an ideal response?