C. Tareas de la semana. Analiza (100%)

1. La longitud de un puente es 100 m cuando la

temperatura es 20 °C. ¿En cuánto aumenta su

longitud en un día de verano en que la

temperatura es 40 °C (αpuente = 2 x 10-4

/°C)?

2. Se tiene un círculo metálico de radio 1 cm y β =

2,02 x 10-4

/°C. ¿En cuántos °C se debe

elevar la temperatura, de tal modo que el

nuevo radio del círculo sea igual a 1.02 cm?

3. Un beaker o vaso de precipitado contiene 1000

cm3 de mercurio lleno hasta el borde. Si se

incrementa la temperatura en 100 °C y el beaker

alcanza un volumen de 1 009 cm3

, ¿cuánto de

mercurio se derrama (αHg = 6 X 10-5

/°C)?

The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes.which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature.sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent