The origin of Earth's oceans is from
A) comet debris.
B) melting of polar ice caps.
C) volcanic eruptions.
D) comets and volcanic eruptions.
Answer: D
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A bat, flying at 7.00 m/s toward a wall, emits a chirp at 50.0 kHz. If the wall reflects this sound pulse, what is the frequency of the echo received by the bat? (vsound = 340 m/s)
a. 52.1 kHz b. 51.1 kHz c. 50.0 kHz d. 49.0 kHz e. 48.6 kHz
On the vernal equinox the sun is
a. north of the celestial equator. b. south of the celestial equator. c. on the celestial equator and moving north with respect to the equator. d. on the celestial equator and moving south with respect to the equator. e. closest to the north celestial pole.
Where groundwater discharges to a stream, the elevation of the water table next to the stream
A) is lower than the surface of the stream. B) is the same as the surface of the stream. C) is higher than the surface of the stream. D) Not enough information given
Meters: A galvanometer that gives a full-scale deflection when 150 µA runs through it is used to make an ammeter that reads a maximum of 1.00 A. To do this, a 3.3-m? shunt was required. What is the resistance of just the galvanometer?
Fill in the blank(s) with the appropriate word(s).