A nanometer is
a. a unit of frequency.
b. a unit of energy.
c. a unit of mass.
d. a unit of length.
e. a unit of resolving power.
D
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Planet A has twice the mass of Planet B. From this information, what can we conclude about the escape speed for Planet A compared to that of Planet B?
A) The escape speed for Planet A must be twice as great as the escape speed from Planet B. B) The escape speed for Planet A must be four times as great as the escape speed from Planet B. C) The escape speed for Planet A is the same as the escape speed from Planet B. D) The escape speed for Planet A is greater than the escape speed from Planet B, but we cannot say how much greater. E) We cannot conclude anything about the escape speed for Planet A without knowing the radii of the two planets.
Thumbprint-like impressions
A. Crater |
B. Stone meteorites |
C. Tektites |
D. Meteors |
E. Regmaglypts |
F. Meteor showers |
Force on a Moving Charge: An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, then the magnetic field must have a component
A. along the +z-axis B. along the -z-axis C. along the -x-axis D. along the +y-axis E. along the -y-axis
What makes the North Star, Polaris special?
a) it appears very near the north celestial pole b)it is the brightest star in the sky c) it can be used to determine your longitude on Earth d) it is the star directly on your northern horizon