A fan, electric heater, and lamp are connected in parallel across a 120-V line. The resistances are Rlamp = 148 ?, Rheater = 32 ?, and Rfan = 48 ?. What is the total current supplied to the circuit?
a. 17.0 A
b. 7.06 A
c. 0.526 A
d. 1.90 A
b
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Suppose we have determined the orbital period of a planet around its star. If we also know the mass of the star, then we can use the planet's orbital period and the star's mass to calculate
A) the planet's average orbital distance. B) mass of the planet. C) eccentricity of the planet's orbit. D) radius of the planet.
A trombone or a trumpet can be considered a(n)
A) open organ pipe. B) closed organ pipe.
The farthest galaxies from the Milky Way appear to be receding from us at the rate of 76,000 miles/sec. An observer in one of these distant galaxies would consider our galaxy to be
A. moving away at 76,000 miles/sec. B. standing still but not at the center of the universe. C. moving at 76,000 miles/sec and located at the center of the universe. D. one of the few moving galaxies in the universe. E. standing still at the center of the universe.
Consider a magnifying glass with a power of 3.0 diopters
(a) What is the maximum angular magnification for a person with a near point at 25 cm? (b) What is the angular magnification when viewing with a relaxed eye? What will be an ideal response?