A joule per second (J/s) is a
a. Watt.
b. Newton.
c. Kilogram.
d. Second.
a
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Applications to Astronomy: What is the parallax angle for Proxima Centauri, which is Earth's nearest star at 4.3 ly? The earth's orbit has a mean radius of 1.5 × 108 km, and 1 ly = 9.46 × 1015 m.
A. 1.2 × 10-14 degrees B. 2.1 × 10-4 degrees C. 1.2 × 10-7 degrees D. 2.1 × 10-7 degrees
RLC Circuits: A 120-V rms voltage is applied across a 6.0-?F capacitor and a series combination of a 100-? resistor. If the frequency of the power source is 60 Hz, what is the rms value of the current in the circuit?
A. 0.26 A B. 0.36 A C. 0.46 A D. 0.56 A E. 0.76 A
The location of the Galactic Center was first found by Harlow Shapley with
A) radio emissions from Sagittarius A. B) RR Lyrae variables in the globular clusters. C) Cepheids of population I in the spiral arms. D) infrared observations of the heat from its accretion disk around the black hole. E) planetary nebulae in the open clusters.
A circuit contains a 2.0-M? resistor in series with an uncharged capacitor. When this combination is connected across an ideal battery,
the capacitor reaches 25% of its maximum charge in 1.5 s. What is its capacitance?