What is the power of the lens that has a focal length of 40 cm and a diameter if 5.0 cm?
A) +0.20 diopters
B) +2.5 diopters
C) +2.7 diopters
D) +20 diopters
E) -2.5 diopters
B
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A 60.0-Hz AC generator with a peak voltage of 110 V drives a series RL circuit with R = 10.0 ? and L = 10.0 mH. The impedance is
A. 3.77 ?. B. 9.26 ?. C. 10.0 ?. D. 10.7 ?. E. 13.8 ?.
A negatively charged particle is moving in the +x-direction when it enters a region with a uniform electric field pointing in the +x-direction. Which graph gives its position as a function of time correctly? (Its initial position is x = 0 at t = 0.)
a.
b.
c.
The inert-gas atoms have the group number of ______________.
Fill in the blank(s) with the appropriate word(s).
Mercury features long, steep cliffs in its crust called "scarps" which probably formed
A. by erosion from high solar winds. B. like giant wrinkles as the crust cooled and shrank. C. after impacts from a planetesimal or asteroid. D. as plates of crust shifted as a result of massive earthquakes at a fault. E. from floods of running water left to evaporate after comet impacts.