Answers: 3
Physics, 21.06.2019 22:30
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
Answers: 1
Physics, 22.06.2019 02:50
Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.
Answers: 3
Physics, 22.06.2019 09:30
Astone is dropped from a cliff and falls 9.44 meters. what is the speed of the stone when it reaches the ground? a. 13.6 m/sec b. 1.39 m/sec c. 185 m/sec d. 9.80 m/sec
Answers: 3
Physics, 22.06.2019 11:00
If a simple machine reduces the strength of a force, what must be increased?
Answers: 3
In reference frame s event b occurs 4 mus after event a. events a and b are separated by 1.5 km alon...
Chemistry, 19.09.2019 01:30
Biology, 19.09.2019 01:30
Mathematics, 19.09.2019 01:30
Business, 19.09.2019 01:30
English, 19.09.2019 01:30
Physics, 19.09.2019 01:30
Health, 19.09.2019 01:30
Health, 19.09.2019 01:30
Computers and Technology, 19.09.2019 01:30
Mathematics, 19.09.2019 01:30
Mathematics, 19.09.2019 01:30