The Sun's atmosphere consists of the ________ and the ________.
A. chromosphere; corona
B. photosphere; chromosphere
C. photosphere; corona
D. corona; solar wind
Answer: A
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The lowest tone to resonate in an open pipe of length L is 400. Hz. What is the frequency of the lowest tone that will resonate in a closed pipe of length 2L?
A) 200. Hz B) 1.60 kHz C) 100. Hz D) 400. Hz E) 0.800 kHz
An incredible amount of electrical energy passes down the funnel of a large tornado every second. Measurements at a distance of 12.8 km from a large tornado showed an almost constant magnetic field of 2.35 × 10^?8 T associated with the tornado. What was the average current going down the funnel? (µ0 = 4? × 10^?7 T?m/A)
a. 3.0E+3 A b. 1.5E+3 A c. 7.5E+2 A d. 9.6E+2 A e. 4.7E+3 A
When bullets are fired in a forward direction from a fighter aircraft, the momentum of the aircraft
A) decreases. B) is unchanged. C) increases.
We have sent several spacecraft on trajectories that will ultimately take them into interstellar space (including Pioneer 10 and 11, Voyager 1 and 2, New Horizons). How long will it take these spacecraft to travel as far as the nearest stars?
A) tens of thousands of years B) a few hundred years C) a few decades D) never, because they will rust and fall apart E) about a thousand years