An 80.0 kg person is riding in an elevator that is accelerating at 2.40 
downward. The apparent weight of the 80.0 kg person measured on a scale in the elevator
A. 592 N.
B. 639 N.
C. 784 N.
D. 855 N.
E. 976 N.
A. 592 N.
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Satellite Motion: A satellite that is in a circular orbit 230 km above the surface of the planet Zeeman-474 has an orbital period of 89 min. The radius of Zeeman-474 is 6.38 × 106 m. What is the mass of this planet? (G = 6.67 × 10-11 N ? m2/kg2)
A. 5.0 × 1024 kg B. 5.5 × 1024 kg C. 6.0 × 1024 kg D. 6.5 × 1024 kg
The temperature of the layer of gas that produces the visible light of the Sun is
A) 3,500 K B) 5,800 K C) 12,300 K D) 300,000 K E) 15 million K
The key process of a laser is
a. stimulated emission. b. Bremsstrahlung. c. electron diffraction. d. microwave absorption.
According to inflation theory, parallel lines appear to remain parallel because
A) the universe is so unbelievably large. B) mass has the effect of balancing the natural curvature of space-time. C) space is inherently flat. D) the universe is so very old.