Physics, 11.10.2021 14:00, Britny2386
(a) A riverside warehouse has several small doors facing the river. Two of these doors are open as shown in the figure below.
The walls of the warehouse are lined with sound-absorbing material. Two people stand at a distance L = 145 m from the wall with the open doors. Person A stands along a line passing through the midpoint between the open doors, and person B stands a distance y = 20 m to his side. A boat on the river sounds its horn. To person A, the sound is loud and clear. To person B, the sound is barely audible. The principal wavelength of the sound waves is 2.40 m. Assuming person B is at the position of the first minimum, determine the distance d between the doors, center to center. (Give your answer in m.)
(b) What is the minimum change in the wavelength of the sound wave for which person B would also hear a maximum at their location? (Give your answer in m.)
Answers: 2
Physics, 22.06.2019 10:30, gyexisromero10
Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.
Answers: 2
(a) A riverside warehouse has several small doors facing the river. Two of these doors are open as s...
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