If a rectangular steel bar having Young's modulus of elasticity is 2.3 GPa is freely laid at a surface and temperature increases from 30℃ to 55℃ then what will be the value of thermal stress ?

Given that coefficient of thermal expansion is 0.2 × 10^(-6).

Zirconium tungstate is an unusual material because its volume shrinks with an increase in temperature for the temperature range 0.3 K to 1050 K (where it decomposes). In fact, the volumetric coefficient of thermal expansion is

A mystery metal is to be used in a top secret government experiment. After applying heat to a 2.0 km piece of the mystery metal, it expands 0.03 m with a temperature increase of 100 deg. C. Calculate the coeffiecient of thermal expansion.

The glass pyrex tube of a mercury thermometer has an insidediameter of 1.4 x 10-4 m. The mercury has a volume of 3 .15 x 10-7m3 at 0°C. Taking into account the expansion of the pyrex glass,how much will the mercury increase in height if the temperatureincreases to 20°C? The coefficient of volume thermal expansion ofpyrex is 9.9x10-6 1/°C and that of mercury is 182x10-6 1/°C .

A) 7.5 cm B) 7.0 cm C) 1.8 cm D) 4.2 cm E) 0.4 cm