Strictly speaking, to say that an apple is red means that
A) an apple is red.
B) it appears red.
C) is, or appears makes no difference–red is red.
Answer: B
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Balance the chemical equation: Cu + Al2O3 ? CuO + Al
Resistance and Resistivity: A certain metal has a resistivity of 1.68 × 10-8 ? ? m. You have a long spool of wire made from this metal. If this wire has a diameter of 0.15 mm, how long should you cut a segment so its resistance will be 15 ??
A. 16 mm B. 16 cm C. 1.6 m D. 16 m
If several balls are thrown straight up with different initial speeds, the quantity that will have the same value along their paths is their
A) initial momentum. B) maximum height. C) time of travel. D) acceleration. E) none of the above
Both Newton and Kepler considered forces on the planets. Kepler mistakenly hypothesized the direction of the forces to be
A) along their directions of travel. B) perpendicular to their directions of travel. C) toward the Sun. D) none of the above