When ice floats in water, a small part of it extends above the surface. Interestingly, the volume of ice that extends above the surface is equal to the volume of the
A) water the ice displaces.
B) vast number of open spaces in the hexagonal ice crystals.
C) both of these
D) none of the above
Answer: B
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An up quark has charge +2/3, a down quark has charge -1/3, and a strange quark has charge -1/3. The Delta- particle is formed by a combination of three down quarks. What is its charge?
A. +1/3 B. -1 C. 0 D. 1 E. -1/3
Which of the following is the best answer to the question "Why does the Sun shine?"
A) The Sun initially began generating energy through nuclear fusion as it formed, but today, it generates energy primarily through the sunspot cycle. B) The young Sun became hotter through gravitational contraction. Once the core was hot enough, nuclear fusion began and has kept the Sun shining ever since. C) The Sun initially began making energy through chemical reactions. These heated the interior enough to allow gravitational contraction and nuclear fusion to occur. D) As the Sun was forming, nuclear fusion reactions in the shrinking clouds of gas slowly became stronger and stronger, until the Sun reached its current luminosity.
Why is magnifying power the least important of the three powers of a telescope?
What will be an ideal response?
The solar neutrino problem was solved when it was discovered that neutrinos ________ during the time they take to reach the Earth
Fill in the blank(s) with correct word