Pulsars are thought to be
A) accreting white dwarfs.
B) rapidly rotating neutron stars.
C) unstable high-mass stars.
D) accreting black holes.
B
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Which one of the following IS NOT a characteristic of terrestrial planets?
a. low average density b. orbits inside the asteroids c. craters in old surfaces d. small diameters e. very few satellites
Two forces of magnitude 50 N, as shown in the figure below, act on a cylinder of radius 4 m and mass 6.25 kg. The cylinder, which is initially at rest, sits on a frictionless surface. After 1 second, the velocity and angular velocity of the cylinder in m/s and rad/s are respectively
A. v = 0; ? = 0. B. v = 0; ? = 4. C. v = 0; ? = 8. D. v = 8; ? = 8. E. v = 16; ? = 8.
Mario Molina and Sherwood Rowland received the 1995 Nobel Prize for
A) their efforts to control chemical warfare. B) their efforts to control nuclear weapons. C) their experiments and theories concerning the chemical basis for atmospheric ozone depletion. D) their discovery of new ways to make the electronic portion of the electromagnetic spectrum more useable by all the people of the world. E) their experiments and theories concerning the chemical basis for global warming.