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
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Spicules
a. are found in the photosphere. b. are magnetic disturbances that push large loops of material off the solar surface. c. are responsible for twisting the solar magnetic field and causing the sunspot cycle. d. appear in the corona near the north and south poles of the Sun during a total solar eclipse. e. are visible in filtergrams of the solar chromosphere.
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
It is generally easier to push an object once it is moving than when you are getting it started. This is because
a. sliding friction is zero. b. sliding friction is less than static friction. c. static friction is less than sliding friction. d. static friction is zero.
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?
A. 9.1 x 10-34m B. 5.7 x 10-34m C. 1.8 x 10-34m D. 6.3 x 10-33m