physics questions and answers

Jun 17th, 2015
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1. What forms of energy are used in the following sports: a)Surfing Kinetic energy of the waves is passed on to the surfboard. b)Nascar racing Chemical energy of the gasoline (fuel) which ignites the cylinder mixture of air and gasoline. c. Hang Gliding ANSWER Potential energy initially and then a mixture of wind energy and potential energy

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Homework: Chapter 31. What forms of energy are used in the following sports: a)Surfing Kinetic energy of the waves is passed on to the surfboard.b)Nascar racingChemical energy of the gasoline (fuel) which ignites the cylinder mixture of air and gasoline.c. Hang Gliding ANSWER Potential energy initially and then a mixture of wind energy and potential energy.d. SkiingANSWER Skiing first uses potential energy as the skier sets off. The potential energy of the skier while descending changes to kinetic energy and at the extreme point of descent, kinetic energy changes to zero and potential energy also becomes nil.e. GolfMechanical energy of the golfer, aided by a small bit of wind energy, which makes the ball wobble in the air.f. Mountain climbingMechanical energy of the climber.2. Would it be energy efficient to use a solar water heating system in Alaska? .Why or why not? What would be a more efficient energy choice to heat water in cold climates?Answer: It is a myth that Alaska is colder than many places in the world. In fact, in summertime, temperatures in Alaska have been known to reach 90oF. In the winter, temperatures in Alaska are low. Solar water heating in Alaska may not be very efficient in the winter. Let us analyze why energy is required to heat water. Water turns vapor at 100oC. Say we have water at 100C. To heat the water there must be some kind of energy feed to the water. This heat energy has the unit Joules or KJ, If we assume that water

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