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The Eiffel Tower (figure) was built of wrought iron and is approximately 300m tall. Estimate how much its A 1.50 kg iron horseshoe, initially at 650'C, is dropped into a bucket containing 20.0 kg of water at height changes between January (average temperature 2C) and July (average temperature 25.C). Ignore 25.0C. What is the final temperature? (Ignore the heat capacity of the container and assume that a the angles of the iron beams and treat the tower as a vertical beam. (Ciron= 12x10-6 .C-1) negligible amount of water boils.) (Celron=470 J/kg."C) Seleccione una: Seleccione una: " a. = 15, 9 cm a. = 28.2 .C " b. = 2,1 cm " b. = 44.2 .C C c. = 3,7 cm c. = 30.2 .C O d. = 45.2 .C "d. = 1.0 cm Ce. = 8,3 cm " e. = 24.2 .C An automobile engine has an efficiency of 20% and produces an average of 23,000 J of mechanical work A heat engine works between temperatures of 500 K and 200 K. If it receives 1600 cal from the boilers, per second during its operation. a) How much heat input is required? find the net work (1 cal = 4,186 J) Seleccione una: Seleccione una: O a. = 105 kJ a. = 4018,56 J 0 b. = 155 kJ " b. =4008,56 J " c. = 125 kJ " c. = 4018,56 J " d. = 115 kJ " d. = 4099,56 J O e. = 175 kl e. = 4028,56 J Find the change in volume experienced by a cast iron block of 8 cm x 12 cm x 7 cm when heated from A fixed quantity of gas undergoes the reversible changes illustrated in the p-V diagram of the figure. How much work is 15 'C to 47 .C. (Coeff of Volumetric Expansion of the cast iron 1.1x104 C-1) done in the process from 1 to 5? Seleccione una: Seleccione una: a. = - 0.5 J a. = 2.9 cm3 " b. = - 0.4 J b. = 2.6 cm3 " c. = - 0.9 J c. = 2.1 cm3 O d. = 2.4 cm3 " d. = - 0.3 J C e. = - 0.7 ) e. = 2.8 cm3