The supernova generated by the explosion of a high mass star fades slowly because of energy generated by ____
a. magnetic fields around the neutron star
b. disintegration of iron in the core of the star
c. radioactive decay of nickel formed in the expanding shell of the supernova
d. fusion of the remaining hydrogen in the star
e. matter-antimatter disintegration around the collapsed core
c
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A satellite orbits the earth once every 2.0 h. What is the orbital period of another satellite whose orbital radius is 4.0 times larger?
A. 4.0 h B. 8.0 h C. 16 h D. 64 h E. Some other period (specify)
A simple pendulum is suspended from the ceiling of a stationary elevator, and the period is measured. If the elevator accelerates upward, the period
1.increases. 2.decreases. 3.remains the same.
Which of the other terrestrial planets is closest in size to Earth?
A. Venus B. Mars C. the Moon D. Mercury
A simply supported beam (L 5 4.5 m) with rectangular cross section (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
