Dust Particles in a Grain Elevator Frequently Have Masses of the Order

question 76

Multiple Choice

Dust particles in a grain elevator frequently have masses of the order of 1.0 × 10^-9 kg.If,to a first approximation,we model the dust particles as an ideal gas,what would be the rms speed of such a particle in air at 27°C? The Boltzmann constant is 1.38 × 10^-23 J/K .

• A)3.5 × 10^-6 m/s
• B)5.6 × 10^-5 m/s
• C)7.8 × 10^-4 m/s
• D)5.2 × 10^-3 m/s
• E)4.9 × 10^-2 m/s

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