Atissue sample from a mammalian heart was measured for its resistivity. held at room temperature, its resistivity is around 1.40 m. calculate the resistance of a tissue sample with 1.00 mm in length and diameter of 2.00 mm. calculate the new resistivity and resistance of the sample when a solution with caand my is introduced and decreases the original resistivity by 32.0%. calculate the old and new conductivities of the sample. which is a better conductor?

Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. provide a plausible explanation for this situation (with supporting calculations) by considering a room whose air temperature is maintained at 20â°c throughout the year, while the walls of the room are nominally at 27â°c and 14â°c in the summer and winter, respectively. the exposed surface of a person in the room may be assumed to be at a temperature of 32â°c throughout the year and to have an emissivity of 0.90. the coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 w/m2 â‹…â‹… k. what is the ratio of the thermal resistance due to convection to the thermal resistance due to radiation in the summer? what is the ratio of thermal resistances in the winter

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

The mini-refrigerator fire was most likely caused by what type of wiring?