When a ?+ particle is emitted from an unstable nucleus, the atomic number of the nucleus
A) increases by 1.
B) does not change.
C) decreases by 1.
D) increases by 2.
E) decreases by 2.
C
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Aristotle's idea of the cosmos was
a) that the world was flat and if you travelled too far you would fall of the edge b) Heliocentric was all planets traveling in ellipses about the sun c) Geocentric with 5 elements and celestial bodies are made of the lightest element called quintessence
The U.S. national debt is about $6 trillion. Expressed in powers of ten, this is
A) $6 × 106. B) $6 × 109. C) $6 × 1015. D) $6 × 1012. E) $6 × 1010.
A temperature change of 20 C° corresponds to a Fahrenheit temperature change of
A) 68 F°. B) 11 F°. C) 36 F°. D) 18 F°.
A space station in the form of a large wheel, 120 m in diameter, rotates to provide an "artificial gravity" of 3.00 m/s2 for persons located at the outer rim. Find the rotational frequency of the wheel (in revolutions per minute) that will produce this effect