By recording the return time of sound and sample thickness, the speed of sound (v) passing the sample was obtained; by using the following relations, modulus of elasticity (E) in GPa was obtained: E = ρ v 2 (1) Thus according to calculated density for the composite, the modulus of...
The scientists tested their theoretical prediction on a wide range of materials and addressed one specific prediction of their theory that the speed of sound should decrease with the mass of theatom. This prediction implies that sound is the fastest in solid atomic hydrogen. However, hydrogen is ...
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The speed of sound in dry air at a temperature of 0°C is 330 m/sec, and in fresh water at 17°C it is 1,430 m/sec. In addition to longitudinal waves, transverse waves, for which the direction of the vibrations is perpendicular to the direction of propagation of the wave, as ...
and so drag forces push against the forward motion of the craft. Large wings usually generate a lot of lift, but they also produce a lot of drag. In designing airplane wings, engineers need to take into account such factors as the speed and altitude at which the plane will fly, so that...
Bloomberg: President Trump has said he plans to impose 25 percent tariffs on all imports of steel and aluminum. This broadens his trade salvos and threatens ties with some of the U.S. top trade partners. He said the tariffs applied to imports of the metals from all countries and apparently...
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