Based on human history, the likelihood that we will eventually colonize other habitable planets in our galaxy is
A) impossible to predict
B) high
C) zero
D) low
B
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Two wires, one copper and the other steel, of equal length stretch the same amount under an applied load P. The moduli of elasticity for each is Es 5 210 GPa and Ec 5 120 GPa. The ratio of the diameter of the copper wire to that of the steel wire is approximately:
(A) 1.00
(B) 1.08
(C) 1.19
(D) 1.32
The fact that the strength of gravity decreases with distance means the force of gravity exerted by one object on another (e.g., the Earth and Moon) is greater on the near side than the far side. This effect is commonly referred to as a
A) tidal force B) differential force C) distortive force D) tractive force
Our Sun will never become hot enough for carbon nuclei to fuse
Indicate whether the statement is true or false
The mass number of an atom is equal to the number of what particles in the nucleus?
A) protons B) neutrons C) nucleons D) electrons E) positrons.