How much heat is necessary to change 20 g of ice at –10°C into water at 20°C?
2.1 kcal
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The Jovian moons Io, Europa, Callisto and Triton are
A) larger than Pluto but smaller than Mercury B) smaller than Pluto C) about the same size as Pluto D) larger than Pluto but smaller than the Moon
Radon is
A) the chemically active element in asbestos. B) a type of electromagnetic radiation that is produced by the sun and partially penetrates Earth's atmosphere. C) the main component in the radioactive fallout from nuclear weapons and nuclear power plant accidents. D) a radioactive gas produced by the rocks and soil that can filter into houses. E) the radioactive substance that will probably be used to irradiate and sterilize food.
Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be
A) zero. B) the same as before. C) small, but noticeable.
Despite varying masses, all spiral galaxies look essentially the same
Indicate whether the statement is true or false