Why have refrigerators been the focus of so much research in lowering energy use?
What will be an ideal response?
Every home has one, they eventually must be replaced, and the oldest models used
huge amounts of energy. The reduction in energy use by refrigerators has saved building a
substantial number of generating facilities.
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Calculate
(a) Calculate the distance required to reduce a beam of photons of energy 1.0 eV that have entered germanium to 50 percent of the initial intensity. (b) What is the wavelength of photons of energy 1.0 eV? (c) Photons of 1.0 eV correspond to what type of electromagnetic radiation? (d) Comment on using germanium for the lenses of an optical system to operate with 1.0 eV photons.
Three capacitors of 0.60, 1.2, and 2.9 ?F are connected in series. Find the combined capacitance
a. 2.8 ?F b. 4.7 ?F c. 6.8 ?F d. 0.35 ?F e. 2.1 ?F
Three identical resistors are connected in series to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors?
A) 12 A B) 4 A C) 36 A D) 24 A E) zero
An object is moving with constant non-zero velocity in the +x-axis. The position versus time graph of this object is
A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve. E) a hyperbolic curve.