An imaginary line from one geographic pole to the other along the surface of Earth perpendicular to the equator, and that passes through Greenwich, England, is called
a. a longitude.
b. a meridian.
c. the International Date Line.
d. a parallel.
e. the prime meridian.
e
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A long, fine wire is wound into a coil with inductance 5 mH. The coil is connected across the terminals of a battery, and the current is measured a few seconds after the connection is made. The wire is unwound and wound again into a different coil with L = 10 mH. This second coil is connected across the same battery, and the current is measured in the same way. Compared with the current in the
first coil, the current in the second coil is: 1.four times as large. 2.twice as large. 3.unchanged. 4.half as large. 5.one-fourth as large.
An electromagnetic wave is a result of electric and magnetic fields acting together
Indicate whether the statement is true or false
A machine gun is attached to a railroad flatcar that rolls with negligible friction. If the railroad car has a mass of 6.25 × 10^4 kg, how many bullets of mass 25 g would have to be fired at 250 m/s off the back to give the railroad car a forward velocity of 0.3 m/s?
a. 400 c. 3000 b. 2000 d. 5000
Valles Marineris is the most striking example of a(n)
A) scarp. B) shield volcano. C) oceanic trench. D) impact crater. E) rift valley.