If an electron is released at the equator and falls toward the Earth under the influence of gravity, the magnetic force on the electron will be toward the:
a. south.
c. west.
b. east.
d. north.
C
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A mass is suspended vertically from a spring so it is at rest at the equilibrium position. The mass is pulled straight down to an extension x and released so that it oscillates about the equilibrium position. The acceleration is greatest in magnitude and directed upward when the mass is
A. at its maximum upward travel. B. at the equilibrium point. C. at its maximum lower travel. D. somewhere between the equilibrium point and maximum extension.
A concave mirror has radius R. When an object is located a distance 2R from the lens, which describes the image formed?
a. real, inverted, diminished b. real, inverted, enlarged c. virtual, upright, diminished d. real, inverted, of equal size
An observation satellite for mapping purposes is placed in a low Earth orbit. In order to see the whole surface of the Earth, which would be the preferred orbit?
a. an equatorial orbit b. a polar orbit c. an orbit inclined 45° to the equator d. It doesn't matter since the Earth turns completely every 24 hours.
A 10-inch telescope (25.4 cm in diameter) is used to determine if what appears to be one star is actually two stars. Stars are so far away that they are essentially point sources
How close (in angle) can the two stars be and still be resolved by this telescope if it is focusing light of wavelength of 550 nm? (Consider only the limitation due to diffraction.) A) 4.2 × 10-8 degree B) 2.6 × 10-6 degree C) 3.0 × 10-4 degree D) 1.5 × 10-4 degree E) 6.6 × 10-8 degree