What is the minimum frequency with which a 300-turn, flat coil of cross sectional area 370 cm2 can be rotated in a uniform 25-mT magnetic field if the maximum value of the induced emf is to equal 8.6 V?
a. 0.20 Hz
b. 2.2 Hz
c. 4.9 Hz
d. 31 Hz
e. 0.031 Hz
c
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A charged capacitor is connected to an ideal inductor. At time t = 0, the charge on the capacitor is equal to 6.00 ?C. At time t = 2.00 ms the charge on the capacitor is zero for the first time. What is the amplitude of the current at that same instant?
A) 2.38 mA B) 4.71 mA C) 0.780 mA D) 1.53 mA E) 1.19 mA
A(n) _______________ can thrive in extreme conditions, such as ice-covered lakes in Antarctica, far underground inside solid rock, amongst the cinders of summits of extinct volcanoes, or in pools of acids
Fill in the blank(s) with correct word
The extent of the continental shelf, an underwater extension of the continental crust, varies due to fluctuations in sea level. When sea level is higher, the continental shelf
A) is narrow because less of the continental shelf is exposed. B) is narrow because less of the continental shelf is submerged. C) wider because some of the continental land would be submerged.
Which one of the following is TRUE?
A) Most elliptical galaxies contain only young stars. B) Most galaxies appear to be approaching the Milky Way Galaxy. C) Irregular galaxies rarely have star formation taking place in them. D) Smaller galaxies called dwarf galaxies tend to be found around larger galaxies like the Milky Way. E) Galaxy collisions destroy most of the stars in the galaxies involved.