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Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?
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An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?
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Aweight is hung from the ceiling of an elevator by a massless string. under which circumstances will...
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