Which of these statements about Hubble's classification scheme for galaxies is false?
A) It represents an evolutionary sequence for galaxies (e.g., type SBa galaxies slowly turn into type SBb).
B) Sc galaxies have smaller bulges and more dusty gas than Sa galaxies.
C) It includes two broad types of spiral galaxies.
D) Low numbered elliptical galaxies are rounder than high numbered elliptical galaxies.
A
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This diagram represents the life track of a 1 solar-mass star from its pre-main-sequence stages to just before its final death. Refer to the life stages labeled with roman numerals. During which stage does the star have an inert (nonfusing) carbon core surrounded by shells of helium and hydrogen fusion?
A) Stage ii B) Stage iii C) Stage iv D) Stage vi E) Stage viii
Because of their immense size, black holes moving through space consume huge quantities of interstellar matter along their paths
Indicate whether the statement is true or false
A straight 10-cm wire bent at its midpoint so as to form an angle of 90° carries a current of 10 A. It lies in the xy plane in a region where the magnetic field is in the positive z direction and has a constant magnitude of 3.0 mT. What is the magnitude of the magnetic force on this wire?
a. 3.2 mN b. 2.1 mN c. 5.3 mN d. 4.2 mN e. 6.0 mN
In a one-dimensional elastic collision of two identical masses, the masses always exchange velocities
Indicate whether the statement is true or false