An unknown tuning fork is sounded along with a tuning fork whose frequency is 256. Hz and a beat frequency of 3. Hz is heard. What is the frequency of the unknown tuning fork?
A) It must be 256 Hz.
B) It must be 259 Hz.
C) It could be either 253 Hz or 259 Hz; there is no way to tell.
D) It must be 253 Hz.
C
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Which of the following in not a factor that prevents molecular cloud contraction?
a. thermal motion b. a force exerted by a magnetic field c. orbital motion d. turbulence
RC Circuits: A resistor, an uncharged capacitor, a dc voltage source, and an open switch are all connected in series. The switch is closed at time t = 0 s. Which one of the following is a correct statement about this circuit?
A. The charge on the capacitor after four time constants is about 98% of the maximum value. B. The charge on the capacitor after one time constant is 50% of its maximum value. C. The charge on the capacitor after one time constant is 1/e of its maximum value. D. The voltage on the capacitor after one time constant is 1/e of the maximum value. E. The voltage on this capacitor after one time constant is 100% of its maximum value.
The current drawn by a 1200-W toaster connected to 120 V is 10 A. The resistance of the toaster coils is
A) 6 ohms. B) 12 ohms. C) 18 ohms. D) none of the above
The Dynamo Theory holds that:
A) lightning plays a major role in generating our magnetic fields. B) any other planet of similar density will also have a strong magnetic field. C) the Earth's core, like Mercury's, is now a solid, rigid bar magnet. D) magnetic fields are generated by rapidly spinning, fluid magnetic interiors. E) the Earth's magnetic field must switch polarities every few million years.