If you think of a battery as an electric charge ‘pump,' the battery voltage is analogous to
a. rate of fluid flow
b. pressure
c. flow velocity
d. water
e. none of the above
B
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Compound Microscope: The focal lengths of the objective lens and the eyepiece in a microscope are 2.90 mm and 2.50 cm, respectively. An object is placed 3.00 mm from the objective. The image of this object is viewed with the eyepiece adjusted for minimum eyestrain for persons with a near point of 25 cm. What is the distance between the objective and the eyepiece?
A. 9.9 cm B. 9.0 cm C. 15 cm D. 11 cm E. 13 cm
The discovery of extra solar planets confirms Bode's law.
Answer the following statement true (T) or false (F)
Super-Earths are:
A) planets that are most earthlike, likely to harbor life. B) planets that are a few times the mass of the Earth. C) planets that have earthlike masses, but orbit much closer to their star than the Earth does to the Sun. D) any rocky (or terrestrial) planet. E) Earth-mass planets that are much lower in density than the Earth, giving them larger radii.
A converging lens with two convex surfaces has a front surface with radius of curvature of 13.1 cm; the back surface has radius of curvature of 16.5 cm, and it is made from material with an index of refraction of 2.10 . What is the focal length of the lens?
a. 6.64 cm b. 57.8 cm c. ?57.8 cm d. 3.48 cm e. 30.3 cm