What is the speed in the medium
A wave with frequency 2000Hz,and wavelength 0.1m (in some certain medium), what is its speed in this medium?
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An athlete swims a length L of a pool in a time t1 and makes the return trip to the starting position in a time t2. If she is swimming initially in the positive x-direction, determine the average velocity symbolically in the first half of the swim
Lead shot is formed by dropping molten lead through the center of a high tower. The frictional resistance of the air as the lead falls down the tower helps to form the spherically shaped "shot" and to cool the lead.
Thirteen percent of the adult population is left-handed. Of the first 44 presidents of the United States, seven are left-handed. Is there evidence that the presidents represent a biased sample of the population? Please explain
A 10-ft steel beam is lowered by means of two cables A & B distant of 9-ft, unwinding at the same speed from overhead cranes. As the beam approaches the ground, the crane operators apply brakes to slow down the unwinding motion.
An extruded beam has the cross section shown and a uniform wall thikness of 3mm. For a vertical shear of 1.2 kips, determine (a) the shearing stress at point A, (b) the maximum shearing stress int he beam. Also sketch the shear flow in the cross
A communication satellite weighing 10,000 lb, including fuel, has been ejected from a space shuttle describing a low circular orbit around the earth.
Apply boundary conditions to obtain the minimum energy of the electron in this box. Compare this energy with that of the n = 10 state of hydrogen.
Is this a: simple random, samplestratified sample, systematic samplecluster sample or convenience sample?
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