Earth's atmosphere probably developed from gases escaping from its interior during volcanic eruptions. This outgassing also produced Earth's
A) protective ozone layer.
B) oceans.
C) numerous mountain belts.
D) ionosphere.
Answer: B
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A 60.0-Hz AC generator with a peak voltage of 110 V drives a series RL circuit with R = 10.0 ? and L = 10.0 mH. The impedance is
A. 3.77 ?. B. 9.26 ?. C. 10.0 ?. D. 10.7 ?. E. 13.8 ?.
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Indicate whether the statement is true or false
Suppose you slowly, and at constant speed, lift a book weighing 12 N from the floor to a shelf 2 m above the floor. Neglect air resistance. The work done by you on the book is
A) 24 watts. B) 6 joules. C) 6 watts. D) 24 joules. E) zero.
A pure sample of 226Ra contains 3.0 × 10^14 atoms of the isotope. If the half-life of 226Ra = 1.6 × 10^3 years, what is the activity of this sample?
a. 13 × 10^10 decays/yr c. 6.7 × 10^9 decays/yr b. 9.4 × 10^10 decays/yr d. 8.7 × 10^10 decays/yr