Two identical tubes have fluid flowing through them at the same speed. in one tube, the fluid is air, and in the other tube, the fluid is fresh water. density(kg/m^3) viscosity (pa⋅s)water at 20°c 998 1.002×10^−31air around 20°c 1.23 1.808×10^−51in which tube is viscosity more important? a. the tube with waterb. the tube with airc. viscosity is equally important in each tubed. not enough information given to decide

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

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?