A 45-mH ideal inductor is connected in series with a 60-? resistor through an ideal 15-V DC power supply and an open switch. If the switch is closed at time t = 0 s, what is the current 7.0 ms later?
A) 250 mA
B) 650 mA
C) 550 mA
D) 280 mA
E) 850 mA
A
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A) a torque. B) a net force. C) both of these D) none of the above
Without greenhouse gases, the Earth's surface temperature would be:
A. Unchanged. B. Hotter in the summer and cooler in the winter. C. Hotter in the winter and cooler in the summer. D. 33 degrees Centigrade cooler. E. 33 degrees Centigrade warmer.
An encounter in which a large galaxy absorbs a smaller galaxy is referred to as
A. "Galactic cannibalism". B. "Galactic assimilation". C. "Galactic absorption". D. "Galactic merger".
An object with a temperature of 8000 K is brightest in the _________ and an object at 4000 K is brightest in the _________
a. infrared/ultraviolet b. visible region/infrared c. blue range/red range d. ultraviolet/green range e. ultraviolet/infrared