Harry takes a space voyage and returns to find his twin sister has aged more than he has. This is evidence that
A) she has changed frames of reference.
B) he has changed frames of reference.
C) both have changed frames of reference.
D) neither has changed frames of reference
Answer: B
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RC Circuits: A 8.0-?F uncharged capacitor is connected in series with a 6.0-k? resistor, an ideal 20-V dc source, and an open switch. If the switch is closed at time t = 0.0 s, what is the charge on the capacitor at t = 9.0 ms?
A. 0 C B. 37% of the minimum charge C. 17% of the maximum charge D. 68% of the minimum charge E. 96% of the maximum charge
What do we mean when we talk about the Milky Way in our sky?
A) The patchy band of light that outlines the plane of the Milky Way Galaxy as seen from Earth. B) The whitish patch of light we see when we look toward the center of the Milky Way Galaxy. C) The spiral-shaped galaxy in which we live. D) The bright stars of the constellations that lie along the ecliptic in our sky.
How will high tides differ from their average values when the Moon is in its new phase?
A. They will be higher than average. B. They will be lower than average. C. They will not differ from average values significantly. D. There are no high tides when the Moon is new.
If a metallic wire of cross-sectional area 4.0 × 10^?6 m2 carries a current of 7.0 A and has a mobile charge density of 4.24 × 10^28 carriers/m3, what is the average drift velocity of the mobile charge carriers? (charge value = 1.6 × 10^?19 C)
a. 1.8E+3 m/s b. 1.7E+3 m/s c. 4.1E–4 m/s d. 2.6E–4 m/s e. 7.0E–6 m/s