The orbits of population I stars I. are confined to disk of the galaxy. II. are very elliptical. III. are nearly circular. IV. are randomly inclined to the disk of the galaxy
a. I
b. IV
c. I & IV
d. II & IV
e. I & III
E
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An aluminum cantilever beam (E 5 72 GPa) with a square cross sec-tion and span length L 5 2.5 m is subjected to uniform load q 5 1.5 kN/m. The allowable bending stress is 55 MPa. The maximum deflection of the beam is approximately:
(A) 10 mm
(B) 20 mm
(C) 30 mm
(D) 40 mm
Everything looks red through a red filter because
A) the filter transmits red light and absorbs other colors. B) the filter reflects red light and transmits other colors. C) the filter emits red light and absorbs other colors. D) the filter absorbs red light and emits other colors.
How do the stellar winds of young Sun-like stars compare to the solar wind we see from the Sun today?
a. Young stars don’t have winds. b. Young stars have weaker winds. c. Young stars have much stronger winds.
A 5000-N force compresses a steel block by 0.0025 cm. How much force, applied over the same area, would be needed to compress the block by 0.0125 cm?
A) 25,000 N B) 2,500 N C) 1,000 N D) 5,000 N