A man stands on a scale in an elevator as shown here. The force of his weight when the elevator is still is Fg downward. Suppose the elevator's acceleration downward is 1/4 g. The weight of the man, Fs, is then:
a. 1/4 Fg.
b. 1/2 Fg.
c. 3/4 Fg.
d. 3/2 Fg.
e. 5/4 Fg.
c
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The great barometric changes accompany the sublimation of carbon dioxide in the Martian spring and summer, creating planet-wide ________
Fill in the blank(s) with correct word
A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular velocity of 20.0 radians per seconds, then the period of the rotational motion is
A. 0.314 s. B. 0.441 s. C. 0.582 s. D. 0.698 s. E. 0.750 s.
What was the first evidence that quasars were different from astronomical objects before they were observed in visual wavelengths?
a. The first quasars were seen to have fuzz. b. Quasars emitted radio energy like active galaxies, but appeared to be point sources in radio wavelengths. c. Quasars showed significant gravitational lens effects. d. The spectra of quasars looked like that of an M dwarf. e. The larger redshifts originally indicated that they were orbiting the center of the Milky Way.
An object starts from rest with an acceleration of 2.0 
for 3.0 seconds. It then reduces its acceleration to 1.0 
for 5.0 additional seconds. The total distance covered is
A. 52 m. B. 38 m. C. 11 m. D. 9.0 m. E. 7.6 m.