A“cooling bag” is commonly used for storing water in hot, arid outdoor environments. the bag made of a thin porous fabric that allows water vapor, but not liquid water, to pass through it. a small amount of water (species a) diffuses through the fabric and evaporates from the surface of the bag. the rate of evaporation is controlled by convective mass transfer from the outer surface of the fabric to the surrounding dry air. the energy for evaporation is supplied by the hot air surrounding the outer surface of the bag. the evaporation of the water cools the remaining liquid water within the bag and a steady-state temperature driving force is established. if the surface temperature of the bag is 283 k, determine the temperature of the surrounding hot air. it may be assumed that the surrounding arid air contains no moisture

Aroll in a paper machine is powered by a separately excited dc machine. operating point 1 (under load): the roll typically operates at 764 rpm and must provide 301 nm of torque to oppose the load of the paper. the armature voltage is 230v for this operating point operating point 2 (no load): when the load is removed the speed of the roll increases to 900 rpm (the field characteristics are unchanged) la ea dev m (a) calculate the maximum torque (units of nm) that the motor can supply with this applied voltage (b) calculate the value of the armature resistance, ra (in ohms) (c) at operating point 1 (loaded condition), the field current, i, and the total input power (armature field), are measured to be to be 10 a and 28,600 w respectively. use this information to calculate the value of the field resistance, rf (in ohms). (d) (d) at operating point 1 (loaded condition), calculate the motor efficiency. express your answer as a percent to at least 2 significant digits. (d) if the field voltage is reduced by 1/2, calculate the new stall torque (in nm) of the motor (f). if the field voltage is reduced by 1/2, calculate the new no-load speed (in rad/sec)

Which accounts for an increase in the temperature of a gas that is kept a constant volume

Describe cytokinesis in plants and animals. in animals: in plants.