Physics, 26.06.2020 16:01, bellabrill
Water is pumped from a lake to a storage tank 20 m above at a rate of 95 L/s while consuming 22.3 kW of electric power. Disregarding any frictional losses in the pipes and any changes in kinetic energy, determine (a) the overall efficiency of the pumpāmotor unit and (b) the pressure difference between the inlet and the exit of the pump.
Answers: 1
Physics, 22.06.2019 06:20, jonmorton159
Clothing made of several thin layers of fabric with trapped air in between, often called ski clothing, is commonly used in cold climates because it is light, fashionable, and a very effective thermal insulator. so it is no surprise that such clothing has largely replaced thickand heavy old-fashioned coats. (a) consider a jacket made of five layers of 0.1-mm-thick synthetic fabric (k = 0.13 w/mĀ·Ā°c) with 1.5-mm-thick air space (k = 0.026 w/mĀ·Ā°c) between the layers. assuming the inner surface temperature of the jacket to be 28Ā°c and the surface area to be 1.25 m2, determine the rate of heat loss through the jacket when the temperature of the outdoors is 0Ā°c and the heat transfer coefficient at the outer surface is 25 w/m2Ā·Ā°c. (b) what would your response be if the jacket is made of a single layer of 0.5-mm-thick synthetic fabric? what should be the thickness of a wool fabric (k = 0.035 w/mĀ·Ā°c) if the person is to achieve the same level of thermal comfort wearing a thick wool coat instead of a five-layer ski jacket?
Answers: 1
Physics, 22.06.2019 12:10, anaroles04
Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4Ā°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?
Answers: 2
Water is pumped from a lake to a storage tank 20 m above at a rate of 95 L/s while consuming 22.3 kW...