Which statement is not thought to be true of all comets in our solar system?
A) Comets always have tails.
B) All comets are icy in composition.
C) All comets orbit the Sun.
D) All comets are leftover planetesimals that originally condensed beyond the frost line in the solar nebula.
A
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LR Circuits: As shown in the figure, a circuit consists of a resistor R = 17 ? in series with an ideal inductor L = 49 H having no resistance. At time t = 0 s, there is a 12-A current in the circuit. At that instant, what is the rate of change of the current?
A. -4.2 A/s B. -12 A/s C. -19 A/s D. -27 A/s E. -35 A/s
On June 21, the noonday Sun is overhead at what latitude?
a. 0° b. 23.5°N c. 23.5°S d. That of the Tropic of Cancer
The inductor in a radio receiver carries a current of amplitude 0.200 A when an ac voltage of amplitude 2.40 V is across it at a frequency of 1400 Hz. What is the value of the inductance?
A) 1.43 mH B) 1.36 mH C) 9.20 mH D) 4.42 mH E) 1.97 mH
Rapidly expanding population effectively strangles most efforts to provide adequate
a. education. b. nutrition. c. health care. d. shelter. e. amounts of all the amenities above.