In an ac circuit, the current in an inductor
A. leads the voltage by 90
B. lags the voltage by 90
C. is in phase with the voltage.
D. leads the voltage by
radians.
E. lags the voltage by
radians.
B. lags the voltage by 90
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The main constituent of the Martian atmosphere is:
A) hydrogen. B) helium. C) methane. D) carbon dioxide. E) nitrogen.
An automobile (m = 1.00 × 10^3 kg) is driven into a brick wall in a safety test. The bumper behaves like a spring (k = 5.00 × 10^6 N/m), and is observed to compress a distance of 3.16 cm as the car is brought to rest. What was the initial speed of the automobile?
Population II stars contain about _____ atoms heavier than helium
A) 0.1 percent B) 0.5 percent C) 1.1 percent D) 2.3 percent
When a spinning ice skater pulls in his arms, he spins faster because
A) his angular momentum must be conserved, so reducing his radius must increase his speed of rotation. B) there is less friction with the air. C) there is less friction with the ice. D) there exists an unbalanced reaction force.