Mometer is calibrated in dry ice (- 78.5 degree C) and in boiling ethyl alcohol

Question

Mometer is calibrated in dry ice (- 78.5 degree C) and in boiling ethyl alcohol (78.0 degree C). The separate pressures are 0.900 atm and 1.635 atm. (a) What value of absolute zero in degrees Celsius does the calibration yield? What pressures would be found at (b) the freezing and (c) the boiling points of water? a) T_0 = - 273.8 degree C b) P_0 = 1.287 atm c) P_100 = 1.757 atm On a day that the temperature is 20.0 degree C, a concrete walk is poured in such a way that the ends of the walk are unable to move. Take Young's modulus for concrete to be 7.00 times 10^9 N/m^2 and the compressive strength to be 2.00 times 10^9 N/m^2. (a) What is the stress in the cement on a hot day of 50.0 degree C? (b) Does the concrete fracture? a) F/A = 2.52 times 10^6 Pa b) So? Does it fracture? c) What is the temperature in degree F ?? Where might the sidewalk construction be taking place? At 25.0 m below the surface of the sea, where the temperature is 5.00 degree C, a diver exhales an air bubble having a volume of 1.00 cm63. If the surface temperature of the sea, what is the volume of the bubble just before it breaks the surface?

Explanation / Answer

(a)

since it is not permitted to expand , the concrete experiences a compresive stress of

stress = Y ( del L/ Lo)

since del L = alpha L0 del T

= Y alpha ( del T)

=(7.0* 10^9) ( 12 * 10^-6) ( 50-20)

= 2.5* 10^6 Pa

(b)

since this stress is less than the compressive strength of concrete , the side walk will not fracture

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