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A flashing beacon is mounted on a navigation buoy in the shipping channel at a port at 30° N latitude. The load consists of a single lamp operating 1.0 s on and 3.6 s off during the hours of darkness. Hours of darkness vary from 9.8 h in July to 13.0 h in December. The lamp draws 2 A at 12 V when lighted. A flasher controls the lamp and draws 0.22 A when the lamp is on. There is a surge current of 0.39 A each time the flasher turns on. This current flows approximately 1/10th of the time the flasher is on. The design has 14 days of battery capacity. Provision has to be made to disconnect the load if the battery voltage drops below 11 V.
The available module has a rated voltage of 17.2 V at 25°C (15 V at 55°C) and 2.3 A at 1 kW/m2. The available battery has a rated capacity of 105 Ah at 12 V. Assume that maximum depth of discharge is 0%. Design the PV system.
0.89 pound-mass of water fills a 2.0309 ft^3 weighted piston-cylinder device at a temperature of 400 F. the piston-cylinder device is cooled until its temperature is 90 F. Determine the final pressure of the water and the volume.
a pressure transducer behaves as a second-order system. if the undamped natural frequency is 10 khz and the damping is
A 1.00%wt Carbon steel (FCC or \gamma?Fe) axel must operate at 850C in an oxidizing environment where the carbon content at the surface of the steel is zero. Only the outermost 200 microns of the component can fall below 0.50%wt C.
the efficiency of counter flow heat exchanger is given byrtco-tcithi-tciwheretcocold water outlet temperaturetcicold
a well insulated piston cylinder device containing 3 lbm of water is compressed using 601 kj of energy. initially the
air enters a one-inlet one-exit control volume at 6 bar 500 k and 30 ms through a flow area of 28 cm2. at the exit the
Plot magnification and transmissibility factor for a 2 DOF (using sprung and un-sprung mass) quarter car suspension model using the following variables:
A small hydroelectric power plant produces electrical power at a rate of 30 kW. The plant utilizes a stream of water that drops 40 m from a lake to the turbine and flows at a rate of 100 kg/s. What is the efficiency of the turbine-generator?
a 2 cm by 2 cm by 2 cm rubber engine mount e 30 mpa poisson ratio 0.4999 must support a 300 kg motor. what maximum
as a designer you are required to develop a new closed sealed thermal energy storage cell that has a maximum reversible
The position-time graph below represents his motion. Use the graph to answer the next several questions.
Humid air is to be conditioned in a constant pressure process at 1 atm from 39C dry bulb and 50 percent relative humidity to 17C dry bulb and 10.8C wet bulb. The air is first passed over cooling coils to remove all the moisture necessary to achieve t..
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