A block of concrete is dragged across the ground. List the non-conservative work being done in decreasing order of magnitude. 1 ! Radioactivity 2 ! Heat 3 Sound ::::
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- A heat engine that 80% efficient exhausts 300 J of waste heat. How much work does the heat engine do?A typical avocado has 180 Calories. If all this energy could be used to lift a bucket of water weighing 40 N, through what vertical distance could the bucket be lifted? (1 calorie = 4.184 J and 1 Calorie = 103 calories) a. 1.72E+6 m b. 3.01E+7 m c. 7.53E+5 m d. 1.88E+4 m4. Suppose that a nuclear power plant has an efficiency of about 0.34, and generates 1000 MW of power. It is located on the banks of a major river that is 67 m wide near the plant, approximately 3 m deep, and flows at a rate of 0.5 m/s. Suppose that the plant re-routes all of this water into the plant and dumps its waste heat evenly throughout the water, then returns the warmer water to the river. How much warmer is the river downstream of the plant compared to upstream? Water's specific heat is approximately 4184 J/kg/K, and its density is 1000 kg/m³. [Answer: The water is warmer by 4.62 K. This is a lot warmer!]
- 1. A person with a basal metabolic rate of 90 W has a continuous (24-hr) average power output, without any physical exertion, of 90 W. If this person consumes 2500 food calories per day and burns 500 calories per day doing additional physical activity, will they gain or lose weight?8.Wind and solar power are both considered renewable sources of energy. Although they are not as widespread as fossil fuel generators, they are slowly gaining popularity worldwide. a) How does a wind turbine generate electricity? b) How does a solar cell generate electricity? c) What common disadvantage do these two methods share? d) If you had to choose between installing equivalent capacity solar cells or wind generators at your home, which one would you install? Justify your answer IU