One parsec is defined as the distance to a star when the star exhibits a parallax of what angle of arc?
a. One degree
b. One second
c. One millimeter
d. One minute
b
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In air a light source emits a wavelength of 630 nm. Under water the wavelength of this light will be
a. 630 nm b. less than 630 nm c. more than 630 nm d. unpredictable
Equilibrium: In the figure, a uniform ladder of weight 200 N and length 10 m leans against a perfectly smooth wall. A firefighter of weight 600 N climbs a distance x up the ladder. The coefficient of static friction between the ladder and the floor is 0.50. What is the maximum value of x for which the ladder will not slip?
A. 3.9 m B. 5.0 m C. 6.0 m D. 6.3 m E. 8.4 m
Compound Microscope: The eyepiece of a compound microscope has a focal length of 2.50 cm, and the objective has a focal length of 1.60 cm. The two lenses are separated by 14.0 cm. The microscope is used by a person with normal eyes, having a near point at 25 cm. What is the magnitude of the magnification of the microscope?
A. 72 B. 88 C. 180 D. 219 E. 115
At its most fundamental level, the goal of astrobiology is to
A) discover the connection between life and the places it is found B) find how life on Earth originated C) find life beyond the Earth D) understand the biological makeup of other life forms