Beside maintaining pressure on the contacts for current carrying capacity, the pressure springs have a second important function. This is to ____.
A. keep the contacts in line
B. help obtain equal contacts against the stationary contacts
C. slow down the pull of the armature into place to reduce the noise
D. increase the power required to close the contacts
Answer: B
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The development of Spanish influence in California in the mid-1760s and 1770s was facilitated by
A. the Black Legend. B. the establishment by Father Junipero Serra of a chain of Spanish missions starting in San Diego and up the California coast to Sonoma. C. existing permanent settlements of Native Americans in California. D. the lack of interest by Christian missionaries to Christianize Native Americans in California. E. the highly successful exploration of California by Spanish explorer Juan Rodriguez Cabrillo.
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A. 5 microfarads B. 4 microfarads C. 20 microfarads D. 25 microfarads
Air is located in a piston-cylinder device. The diameter of the cylinder is 12 cm, the mass of the piston is 5 kg, and the acceleration due to gravity is 9.80 m/s2. The local atmospheric pressure is 100.5 kPa. Determine the mass of a set of weights that needs to be added to the top of the piston so that the absolute pressure of the air in the cylinder is 250 kPa.
Given: D = 12 cm = 0.12 m; m = 5 kg; g = 9.80 m/s2; Patm = 100.5 kPa; P = 250 kPa What will be an ideal response?