What are the observational pieces of evidence that confirm the existence of a three-part structure (bulge, disk, halo) to the Milky Way Galaxy?
What will be an ideal response?
The Galactic halo is observed by mapping globular clusters. The central bulge is seen in radio mapping. The disk is seen optically for nearby areas, and by radio mapping for far-flung regions hidden by dust and gas optically.
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A bullet moving at 244. m/s strikes a tree and penetrates a distance of 8.34 mm before stopping. What was the average acceleration of the bullet as it slowed?
What will be an ideal response?
A ruby laser beam (? = 694.3 nm) is sent outwards from a 2.7-m diameter telescope to the Moon, 384,000 km away. What is the radius of the big red spot on the Moon?
A. 500 m B. 250 m C. 120 m D. 1.0 km E. 2.7 km
Volcanic rocks form from
A) the eruption of viscous magma. B) partial melting of basalt. C) solidification of lava.
A 25.0-kg object sitting at rest is struck elastically in a head-on collision with a 20.5-kg object initially moving at +4.0 m/s. Find the final velocity of the 25.0-kg object after the collision
a. ?0.90 m/s b. ?3.6 m/s c. +6.6 m/s d. +3.6 m/s e. +15 m/s