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Below, BIO indicates a problem with a biological or medical focus. Problems labeled EST ask you to estimate the answer to a quantitative problem rather than derive a specific answer. Asterisks indicate the level of difficulty of the problem. Problems with no * are considered to be the least difficult a single * marks moderately difficult problems. Two ** indicate more difficult problems.
* BIO Types of energy and reversibility of a process Describe the types of energy that change, the work done on the system, and the energy transferred through heating during the following processes. Indicate whether a reverse process can occur. (a) Water at the top of Niagara Falls cascades onto the blades of an electric generator near the bottom of the falls, rotating the blades and generating an
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- > Consider the process shown in (Figure 1). Suppose E₁ = 2 J. Figure E (J) 4E₁- 3E₁- 2E₁- E₁ 0- LLL + + K₁ + U₁ + Wext = K₁ + U₁ + AEth Part A What is the final potential energy of the system for this process? Express your answer with the appropriate units. U₁ = Value Submit HA Provide Feedback Request Answer PERE Units Pearson ?arrow_forwardChampionship swimmers take about 22 s and about 30 arm strokes to move through the water in a 50 m freestyle race.a. As shown, a swimmer’s metabolic power is 800 W. If the efficiency for swimming is 25%, how much energy is expended moving through the water in a 50 m race?b. If half the energy is used in arm motion and half in leg motion, what is the energy expenditure per arm stroke?c. Model the swimmer’s hand as a paddle. During one arm stroke, the paddle moves halfway around a 90-cm-radius circle. If all the swimmer’s forward propulsion during an arm stroke comes from the hand pushing on the water and none from the arm (somewhat of an oversimplification), what is the average force of the hand on the water?arrow_forwardYou eat a sandwich. Later that day, you walk up a flight of stairs. a. Describe how energy changes type and location in the above situation. b. Explain how energy conservation applies to the situation.arrow_forward
- I Review I Constar An "energy bar" contains 25 g of carbohydrates. For the steps and strategies involved in solving a similar problem, you may view a Video Tutor Solution. Part A If the energy bar was his only fuel, how far could a 68 kg person walk at 5.0 km/h? Express your answer in meters. d = Submit Previous Answers Request Answerarrow_forwardPlease example it in the simplest way. i am really trying to understand this question. please dont skip ANY stepsarrow_forwardProblem Power Output. In each case, find your average power in watts. Assume that riding a bike burns 100 Calories per mile. If you ride at a speed of 20 miles per hour, what is your average power output, in watts?arrow_forward
- Choose the correct answer Your Lecturer in class made the following statement: "We do not buy electrons from Eskom but we buy electrical energy!". Electrical Poerr can be described as electrical energy unit time. Electrical Energy can be brought from ESKOM in units of R2,50 for 1 KiloWatt- hour. How much will it cost to operate a 1200 W hairdryer continuously for 30 minutes? A. R3,00 B. R1,50 C. 60c D. R6,00arrow_forwardI am needing assistance with this question in its entirety ***Please type your answer or write in print, because I have had great difficulty with understanding most handwritten assistance done in cursive or mixed print/cursive.arrow_forwardWind 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 IUarrow_forward
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