For electric current in the home, your power company supplies
A) energy.
B) electrons.
C) both of these
D) neither of these
Answer: A
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A string is stretched and fixed at both ends, 200 cm apart. If the density of the string is 0.015 g/cm, and its tension is 600 N, what is the fundamental frequency?
a. 316 Hz b. 632 Hz c. 158 Hz d. 215 Hz e. 79 Hz
The largest diameter telescopes are used to observe
A) radio waves. B) infrared light. C) visible light. D) ultraviolet light. E) x-rays.
Two water waves, call them X and Y, have the same amplitude, but X has a higher frequency than Y. Regarding their wavelengths and their energies,
A) Y has the larger wavelength and the two waves carry the same energy. B) X has the larger wavelength and carries the greater energy. C) Y has the larger wavelength and carries the greater energy. D) Y has the larger wavelength and X carries the greater energy. E) X has the larger wavelength and Y carries the greater energy.
An ore car of mass 4 000 kg starts from rest and rolls downhill on tracks from a mine. A spring with k = 400 000 N/m is located at the end of the tracks. At the spring's maximum compression, the car is at an elevation 10 m lower than its elevation at the starting point. How much is the spring compressed in stopping the ore car? Ignore friction