The length and width of a standard sheet of paper is measured, and then the area is found by calculation to be 91.50 in.2 . The number of significant figures in the width measurement must be at least
a. 1.
b. 2.
c. 3.
d. 4.
e. 5.
c
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The pulsations from a neutron star are due to
A) the gas that surrounds it. B) its large mass. C) its rapid spinning motion. D) the vibrations of its neutrons. E) the nuclear reactions taking place in its center.
A lens of focal length 45 mm is mounted on a 35-mm camera. The lens aperture is set at f/2.0 and the shutter speed set at 1/2000 s
The photographer wants to keep the same exposure (amount of light), but wants to change the f-number to f/8.0 for greater depth of field. What should be the new shutter speed to maintain the same exposure? A) 1/4000 s B) 1/8000 s C) 1/500 s D) 1/125 s E) 1/1000 s
Where do volcanoes form?
What will be an ideal response?
Careful observations of nearby normal and active galaxies reveal that the ass of the central black hole is well correlated with the mass of the galactic bulge. The ratio of bulge mass to black hole mass is roughly:
A) 1 to 2000. B) 1 to 200. C) 1 to 20. D) 20 to 1. E) 200 to 1.