Which of the following is the overall fusion reaction by which the Sun currently produces energy?
A) 3 H ? 1 Li + energy
B) 3 He ? 1 C + energy
C) 4 H ? 4 He + energy
D) 6 H ? 1 He + energy
E) 4 H ? 1 He + energy
E) 4 H ? 1 He + energy
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When a magnet is moved to and fro in a wire coil, voltage is induced. If the coil has twice as many loops, the voltage induced is
A) half. B) the same. C) twice. D) four times as much. E) none of the above
The results of statistical studies of the exoplanet systems discovered to date suggests that what proportion of stars are likely to have a planet less than half the size of the Earth and in an orbit within a star's habitable zone?
A) 10 to 20% B) 50% C) much less than 10% D) more than 90%
Is it possible for the total mechanical energy of a moving particle to be negative?
a. No, because a moving particle has positive kinetic energy. b. No, because potential energy cannot have a value more negative than the value of the positive kinetic energy of the particle. c. Only if friction is involved. d. yes
In expressions like ?v and ?t, ? stands for
a. "change in". b. "triangle". c. a constant of proportionality. d. a variable.