The dynamic random access memory (DRAM) in computers is produced by oxidizing a silicon wafer to produce a capacitor with SiO2 as the dielectric, and the memory corresponds to the charge stored on the capacitor. Assume that the thickness of the dielectric is 1×10-6 m, the plates of the capacitor are square with an edge length of 10×10-6 m, the dielectric constant or relative permeability of SiO2 is 4, and the applied voltage is 10 V.
(a) What is the capacitance?
(b) What total charge is stored in this capacitor?
(c) What is the charge density on the capacitor plates?
(d) What is the polarization of the SiO2 in the capacitor?
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A car travels a distance of 100 km. For the first 30 minutes it is driven at a constant speed of 80 km/hr. The motor begins to vibrate and the driver reduces the speed to 40 km/hr for the rest of the trip. The average speed for the entire trip is
A. 50.0 km/hr. B. 60.0 km/hr. C. 53.3 km/hr. D. 47.5 km/hr. E. 40.0 km/hr.
Which alcohol is used in beverages?
a. 2-Propanol b. Ethylene glycol c. Ethanol d. Methanol
Light travels from inside a building to outside through a pane of glass. Which of the following is true regarding the phase change upon reflection in the case?
a. A 180o phase change occurs at the inside surface but not at the outside surface. b. A 180o phase change occurs at the outside surface but not at the inside surface. c. A 180o phase change occurs at both the inside surface and the outside surface. d. No phase change occurs at either the inside surface or the outside surface of the glass.
If the Moon were four times as massive but twice as far from Earth, high tides on Earth would be
A) higher. B) lower. C) no different.