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A room measures 2.0 m by 5.5 m by 5.0 m. The heating and air-conditioning ducts to and from the room are circular with diameter 0.23 m and all the air in the room is to be exchanged every 18 min.
(a) What is the average flow rate?
m3/s
(b) What is the necessary flow speed in the duct? (Assume that the density of the air is constant.)
m/s
a uniform 12.0kg ladder is 4.0m long and is placed against a frictionless wall at 30 degress. find the frictionless force at the floor necessary to maintaain equilibrium
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The maximum characteristic x-ray photon energy comes from the capture of a free electron into a K shell vacancy. What is this photon energy in keV
question1a 1201.0 n uniform boom of length l is supported by a cable. the boom is pivoted at the bottom the cable is
Due to the wave nature of light, light shined on a single slit will produce a diffraction pattern, What is the width of the first order fringe
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