A double-convex lens made of glass having a refractive index of 1.50 has a radius of magnitude 40 cm on the front side and one of magnitude 30 cm on the back side. What is the focal length of this lens?
A) 34 cm B) -240 cm C) 80 cm D) 11 cm E) -11 cm
A
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How long is a leap year in the Gregorian calendar?
a year of exactly 365 days a year of exactly 360 days a year that is skipped in the Julian calendar a year of exactly 366 days
When a glass rod is rubbed with silk, which of the following statements best describes what happens?
a. Electrons are removed from the rod. b. Protons are removed from the silk. c. The silk is charged positively. d. The silk remains neutral.
An LRC ac series circuit with R = 15 ?, L = 25 mH, and C = 30 ?F, is attached to a 100-V (rms) ac power supply. The frequency of the power supply is adjusted so that the circuit is in resonance
(a) What is the rms current in the circuit? (b) What is the power dissipated by the circuit?
The process of combining signals from separate telescopes to improve resolution is called ____________________
Fill in the blank(s) with correct word