A boat loaded with ice is floating in a swimming pool. If the ice is thrown into the pool, the water level in the pool, once the ice stops bobbing and floats steadily,
A) rises.
B) falls.
C) stays the same.
D) There is not enough information to answer this question.
C
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Based on the curves shown here, which of the following statements best describes how we can distinguish a massive star supernova from a white dwarf supernova?
A) A white dwarf supernova is brighter at its peak and over a few months fades more steadily than a massive star supernova. B) For a few seconds, a white dwarf supernova is brighter than a massive star supernova, but after that the two look virtually identical. C) The spectrum of a massive star supernova has two major spectral lines, while a white dwarf supernova has only one. D) The two types of supernovae behave so similarly that we can only distinguish them by studying photographs of the systems taken before the explosions.
What produces the striking red, blue, and black colors of ionization nebulae?
What will be an ideal response?
The shape and size of a nucleus can best be described as
The 1964 experiment that checked the validity of the principle of the constancy of lightspeed involved
A) a NASA satellite that emitted radiation both forward and backward. B) jet planes carrying a highly accurate atomic clock, and a similar clock on Earth. C) a fast-moving sub-atomic particle that emitted radiation both forward and backward. D) the emission of light from two atoms that were at rest on Earth. E) comparison of the speeds of two parallel light beams, one emitted on Earth and other emitted from a jet airplane.