The left ventricle of a resting adult’s heart pumps blood at a flow rate of 83 cm^3/s, and an average heartbeat increases the pressure in the vessels by 73.5 mm Hg, the speed of the blood from zero to 25 cm/s, and the height by 11.45 cm. Calculate the total power output of the left ventricle. Note that most of the power is used to increase blood pressure.

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

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

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