The proton contains which of the following combination of quarks?
a. two up quarks and one down quark
b. one up quark and two down quarks
c. one top quark and two bottom quarks
d. two top quarks and one bottom quark
a
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The natural frequency of an object depends on its
A) elasticity. B) size and shape. C) both of these D) none of the above
The equator receives the same amount of sunlight from season to season
a. True b. False Indicate whether the statement is true or false
Why is the core hot?
A. from both the decay of radioactive atoms and the leftover heat B. from heat left over from the planet's birth C. The high pressure in the core drives the temperature higher. D. from the steady decay of radioactive atoms in the rock E. None of these choices are correct.
The focal length of a magnifying glass is 15 cm. If the near point of a person is 25 cm, what is the magnification of this glass for this person when his eyes are focused at infinity?
A) 1.7 B) 2.7 C) 3.7 D) 4.7 E) 5.7