Physics, 16.06.2021 16:20 madisonromney2819
Problem 2: A 75 W light bulb consumes 75 W of electricity. The following light bulbs provide the same amount of light: a 60 W incandescent bulb, a 15 W compact fluorescent bulb (CFL), or a 12 W light-emitting diode light (LED). A. Write an energy balance for a light bulb in words with each term having dimensions of energy per time. Assume that the light bulb itself is not a sink. Be specific for this problem. B. An incandescent bulb is only 2.5% efficient (i. e., only 2.5% of the energy entering the incandescent bulb produces light). Using the energy balance, calculate heat releases by all three bulbs and the efficiency of the CFL and LED bulbs. Assume steady state.
Answers: 3
Physics, 22.06.2019 13:30
6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.
Answers: 2
Physics, 22.06.2019 16:30
In a heat engine if 1000 j of heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the inital energy was 2000 j1.write the equation2.list out your known variables 3. plug the numbers into the equations4.solve 5.write your solution statement that includes initial energy and final energy added.
Answers: 3
Physics, 22.06.2019 18:00
Which of the following is not a physical property of mattera. melting pointb.heat of combustionc. viscosityd. boiling point
Answers: 1
Physics, 22.06.2019 20:30
Atypical jetliner lands at a speed of 146 mi/h and decelerates at the rate of (10.4 mi/h)/s. if the jetliner travels at a constant speed of 146 mi/h for 1.5 s after landing before applying the brakes, what is the total displacement of the jetliner between touchdown on the runway and coming to rest?
Answers: 2
Problem 2: A 75 W light bulb consumes 75 W of electricity. The following light bulbs provide the sam...
Computers and Technology, 16.07.2019 05:10