A +15-nC point charge is placed on the x axis at x = 1.5 m, and a ?20-nC charge is placed on the y axis at y = ?2.0m. What is the magnitude of the electric field at the origin?

a. 105 N/C
b. 15 N/C
c. 75 N/C
d. 45 N/C
e. 60 N/C


c

Physics & Space Science

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Molecular Speeds: 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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It is generally easier to push an object once it is moving than when you are getting it started. This is because

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A baseball has a mass of 0.15 kg. If pitched at 40.0 m/s with a relative uncertainty of 1%, how uncertain is its position?

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Physics & Space Science