A vibrating guitar string emits a tone simultaneously with one from a 495-Hz tuning fork. If a beat frequency of 5.00 Hz results, what is the frequency of vibration of the string?
a. 2 480 Hz
b. 500 Hz
c. 490 Hz
d. 250 Hz
e. Either choice b or c is valid.
e
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According to astronomers, the Milky Way is _____
A) wheel shaped B) hexagonal C) rectangular D) bell shaped
Vision Problems: A farsighted girl has a near point at 2.0 m but has forgotten her glasses at home. The girl borrows eyeglasses that have a power of +2.75 diopters. With these eyeglasses, what is the near point of the girl, assuming that she wears them extremely close to her eyes?
A. 28 cm B. 31 cm C. 33 cm D. 37 cm E. 40 cm
A 0.50-m long solenoid consists of 1000 turns of copper wire wound with a 4.0-cm radius. When the current in the solenoid is 18 A, the magnetic field at a point 1.0 cm from the central axis of the solenoid is
A. 0.090 mT. B. 0.36 mT. C. 23 mT. D. 36 mT. E. 45 mT.
A train is traveling due south at a constant
velocity of 86 mi/h. Any unbalanced force acting on the train with respect to the Earth’s surface must be a)zero. b)directed vertically upward. c)directed toward the south. d)directed vertically downward.