A source emits sound at a fixed constant frequency f.If the source moves away from you, the frequency you hear is
a. the same as f. b. higher than f.
c. lower than f. d. unrelated to f.
c
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The average orbital speed of a star around the center of our galaxy depends primarily on
A) the mass of the Milky Way's central black hole. B) the mass of the entire galaxy, including the halo. C) whether the star is in the disk or halo of the galaxy. D) the mass of the galaxy inside its orbit.
________ major contribution to astronomy is his extensive series of measurements of planetary positions.
A. Kepler's B. Copernicus's C. Galileo's D. Tycho Brahe's
A 2.0-C charge moves with a velocity of (
) m/s and experiences a magnetic force of (
) N. The x component of the magnetic field is equal to zero. Determine the z component of the magnetic field.
A. ?3.0 T B. +3.0 T C. +5.0 T D. ?5.0 T E. +6.0 T
The molecular mass for chlorine is not an integer multiple of the molecular mass of hydrogen but is about 35.5 times the molecular mass of hydrogen. This is primarily because
a. the proton and neutron have different masses. b. there are different isotopes of chlorine. c. of the binding energy of the chlorine nucleus. d. the chlorine nucleus has 35.5 nucleons.