The focal lengths of the objective lens and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively. An object is placed at 0
30 cm from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain for persons with a near point of 25 cm. The magnitude of the final overall magnification of the microscope is closest to
A) 200 B) 500 C) 100 D) 410 E) 300
E
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An object is thrown downward with an initial (t = 0) speed of 10 m/s from a height of 60 m above the ground. At the same instant (t = 0), a second object is propelled vertically upward from ground level with a speed of 40 m/s. At what height above the ground will the two objects pass each other?
a. 53 m b. 41 m c. 57 m d. 46 m e. 37 m
All the following types of objects are found almost exclusively in the disk (rather than the halo) of the Milky Way except ________
A) X-ray binaries B) high-mass, red supergiant stars C) young stars D) globular clusters
At a particular instant, a proton moves toward the east in a uniform magnetic field that is directed straight downward. The magnetic force that acts on it is
A) downward. B) upward. C) zero. D) toward the north. E) toward the south.
Water in a confined aquifer is
A) freely flowing. B) under pressure. C) recharge. D) discharge.