Define specific gravity
What will be an ideal response?
The specific gravity of a substance is defined as the ratio of the density of that substance to the density of water at 4.0°C.
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The helium in a child's balloon is composed of
A) former alpha-particle. B) former beta particles. C) both of these D) neither of these
Compared to optical telescopes, radio telescopes are built large because:
A) they're less expensive to make than optical telescopes. B) radio photons don't carry much energy. C) atmospheric turbulence is more of a problem. D) radio sources are harder to find. E) radio waves are absorbed by the atmosphere.
The process by which a single magma can generate several magmas of different compositions is
A) partial melting. B) partial crystallization. C) fractional crystallization. D) partial distillation.
Compared to the recoiling cannon, a fired cannonball has a
A) greater momentum. B) greater kinetic energy. C) smaller speed. D) all of the above