Why might it be difficult for Earth-like planets to form around Sun-like stars in the outer parts of the disk of our galaxy?
A) there would be insufficient amounts of heavy elements
B) the stars would be packed together too densely for planets to be stable
C) any stars would be sucked into the central supermassive black hole
D) there would be too much harmful radiation
A
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A steady diet of inflowing gas, dust, and an occasional star would keep the supermassive black hole in an active galactic nucleus (AGN) active
Indicate whether the statement is true or false
Velocity: If you are driving 72 km/h along a straight road and you look to the side for 4.0 s, how far do you travel during this inattentive period?
A. 18 m B. 20 m C. 40 m D. 80 m
Electromagnetic waves consist of
A) compressions and rarefactions of electromagnetic pulses. B) oscillating electric and magnetic fields. C) particles of light energy. D) high-frequency sound waves.
A simply supported beam (L 5 4.5 m) with rectangular cross sec-tion (b 5 95 mm, h 5 280 mm) supports uniform load q 5 25 kN/m. The ratio of the magnitudes of the principal stresses (?1/?2) at a point a 5 1.0 m from the left support and distance d 5 100 mm up from the bottom of the beam is approximately:
(A) 9
(B) 17
(C) 31
(D) 41