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ENERGY PROBLEMS STUDENTS: RAÚL, MARCOS, PAULA, AINOA AND MARTA

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PROBLEM 1 Paula is out with her friends. Misfortune occurs and Paula and her friends find them selves getting a workout. They apply a comulative force of 1080 N to push the car 218 m to the nearest fuel station. Determine the work done no the car. W = F x d W = 1080 x 218 = J = 2,35 x 10 5 J

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PROBLEM 2 While training for breeding season, a 380 g male squirrel does 32 pushups in a minute, displacing its center of mass by a distance of 8.5 cm for each pushup. Determine the total work done on the squirrel while moving upward (32 times). E p = m x g x h E p = 0,38 x 0,085 x 9,8 = 0,31654 W = F x d W = 0,31654 x 32 = 10,12988 J

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PROBLEM 3 During de Powerhouse lab, Jerome runs up the stairs, elevating his 102 kg body a vertical distance of 2,29 in a time of 1,32 s at the constant speed. Determine the power generated by Jerome. P = W / (t f – t i ) P = (102 x 9,8 x 2.29) / 1,32 = 1734,15 W = 1,73 x 10 3 W

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PROBLEM 4 How much heat is needed to raise the temperature of 2 kg of copper from 20º C to 70º C? Given: m=2 kg; T=70º C – 20º C= 50º C; c= 3,9 x 10 2 J/kg Q = m x c x (T f – T i ) Q = 2 x 3,9 x 10 2 x 50 = 3,9 x 10 4 J

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PROBLEM 5 According with a scientific research performed recently, Italy needs to push photovoltaic cells technology along 1861 km 2 to face the demand of electric energy. The italian territory covers km 2. Which percentage of italian territory need to cover with photovoltaic celles to face the italian energy consumption requirements? % = (1861 / ) x 100 = 0,6 %

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PROBLEM 6 A wind generator with 30 meters blades supply 1500 KW power. If average daily electric requirement per family is equal to 1,5 KW, how many families is a single generator able to satisfy the demand of? families = 1500 / 1,5 = 1000 families

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