A 15-?F air-filled capacitor is connected to a 50-V voltage source and becomes fully charged. The voltage source is then removed and a slab of dielectric that completely fills the space between the plates is inserted
The dielectric has a dielectric constant of 5.0. (a) What is the capacitance of the capacitor after the slab has been inserted? (b) What is the potential difference across the plates of the capacitor after the slab has been inserted?
(a) 75 µF (b) 10 V
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A) 6 B) 11 C) 8 D) 7 E) 9
A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day. The heat produced by the combustion of coal is 3.3 × 107 J/kg
The steam that drives the turbines is at a temperature of 300°C, and the exhaust water is at 37°C. (a) What is the overall efficiency of the plant for generating electric power? (b) What is the maximum efficiency that this plant could possibly have using the same temperature extremes that it presently uses? (c) How much thermal energy is exhausted each day by this plant?
Which of the following best describes the term sticky content?
A. Content that entices website visitors to return frequently. B. Content that allows for interactivity. C. Dynamic content. D. Content that stays the same.
A measuring stick on a rapidly rotating disk will not appear to shrink if it is oriented along the
A) circumference. B) radius. C) either of these D) neither of these