A 2.0-?F capacitor in series with a 2.0-k? resistor is connected to a 60-Hz AC source. Calculate the impedance of the circuit
a. 1500 ohms
b. 1800 ohms
c. 2100 ohms
d. 2400 ohms
e. 8600 ohms
d
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a. to form images of internal organs b. by bats to navigate c. in automatic focus cameras d. to control insects e. all of the above
What is the primary way in which we determine the mass distribution of a spiral galaxy?
A) We construct its rotation curve by measuring Doppler shifts from gas clouds at different distances from the galaxy's center. B) We calculate its mass-to-light ratio. C) We apply Newton's version of Kepler's third law to the orbits of globular clusters in the galaxy's halo. D) We count the number of stars we can see at different distances from the galaxy's center.
When a ?+ particle is emitted from an unstable nucleus, the atomic number of the nucleus
A) increases by 1. B) does not change. C) decreases by 1. D) increases by 2. E) decreases by 2.
A current of 2.0 A in the 100-turn primary of an ideal transformer causes 14 A to flow in the secondary. How many turns are in the secondary?
A) 700 B) 4 C) 114 D) 14