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- How does hydroelectric energy work?A. It uses the power of the sun to turn workB. Water turns a propeller to produce electricityC. Water is cooled and is then chemically treated to generate electricity.D. The water is heated, producing water vapor which is used to generateelectricity.Calculate the power used by a microwave oven that uses 112 500 J of energy in 2.5 minutes.For centuries, the people of Paradis Island have been isolated from the rest of the world. The SI units are unknown to them. Expeditions sent to the island revealed that they created their own system of units, and some of their findings are summarized in Tables 1 and 2. To help the Paradisians advance technologically, people from the outside are planning to construct a power plant on the island. The plant produces an average of 875.9 gigawatts (GW) of power. A. Calculate the average power rating of the plant in Arlert (R). (1 W = 1 kg.m²/s³) B. Calculate the energy produced by the plant in 5.400 x 104 s of operation. Express the result in Yeager (Y). (1 J = 1 W-s = 1 kg.m²/s²) (Note: Power = energy/time) C. How many households can be powered by the plant after 5.400 x 104 s of operation if each house consumes 1.50 x 1011 Y of energy?
- A copper transmission cable 34 km long and 19.5 cm in diameter carries a current of 11 A. How much electrical energy (in MJ) is dissipated as thermal energy in 9 hours? Note: = 1.72x10-8 m show the complete and organize solution and dont round off show the final asnwer in 4 decimal places if possible5. A 250-volt electrical heater is used to warm 3Li/hr of water from 19°C to 98°C. Assume heat conversion loss of 25% of the total heat supplied, how much current in amperes must be supplied to this heater. Derive with the formula below, show the cancellation, explain the step by step and DRAW a free body diagram/figure. refer with this: PE1 + KE1 + U1 + WF1 + Q1 + W1 = PE2 + KE2 + U2 + WF2 + Q2 + W2 + E losses.15.8 The US auto industry produces approximately 6 million vehicles a year, each containing roughly 1.5 metric tons of fabricated metal. Consider a future wind-turbine industry having half of the auto industry ’ s mass throughput of wind-turbine units. Each unit has a specific weight of 75 kg/kW e rated (nacelle components plus tubular tower only). a. At a wind-turbine capacity factor of 0.3, how long would it take to replicate the 2008 US-installed average electric power rating of 1,035 GW e ? b. Discuss the relevant factors that would determine whether a wind-machine industry of this size could be successfully operated sustainably over periods on the order of several centuries.