Plexo Cervical Flashcards

A woman walks due west on the deck of a ship at 3 mi/h. The ship is moving north at a speed of 22 mi/h. Find the speed and direction of the woman relative to the surface of the water.

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engineering

Determine the temperature coefficient of a 5-V Zener diode (rated 25 $^{\circ} \mathrm{C}$ value) if the nominal voltage drops to 4.8V at temperature of 100 $^{\circ} \mathrm{C}$ .

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engineering

The steam requirements of a manufacturing facility are being met by a boiler whose rated heat input is $3.6 \times 10^{6}$ $\mathrm{Btu} / \mathrm{h}$ . The combustion efficiency of the boiler is measured to be $0.7$ by a hand-held flue gas analyzer. After tuning up the boiler, the combustion efficiency rises to $0.8$ . The boiler operates $1500$ hours a year intermittently. Taking the unit cost of energy to be $\$ 4.35 / 10^{6} \mathrm{~Btu}$ , Find the annual energy and cost savings as a result of tuning up the boiler.