A heavy stone of mass m is hung from the ceiling by a thin 8.25-g wire that is 65.0 cm long. When you gently pluck the upper end of the wire, a pulse travels down the wire and returns 7.84 ms later, having reflected off the lower end
The speed of sound in the room is 344 m/s, and the stone is heavy enough to prevent the lower end of the wire from moving. If the wire is vibrating in its second overtone, what is the frequency of the sound it will produce?
A) 383 Hz B) 128 Hz C) 191 Hz D) 255 Hz E) 765 Hz
A
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81 m/s2. A) 202 m/s B) 9.80 m/s C) 19.6 m/s D) 45.2 m/s E) 94.4°
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The first confirmed black hole, Cygnus X-1, was regarded as proof that black holes exist because it
a. is a compact object in a binary system b. emits X-rays from a hot accretion disk c. is accreting matter from a main-sequence companion d. has a period of 5.6 days e. has a mass of ten solar masses
The figure below represents a string which has a heavy section and a light section. The mass per unit length of the heavy section is 16 times as large as the mass per unit length of the light section. When the string is under tension, the speed of a pulse traveling in the heavy section is ____ times the speed of that same pulse traveling in the light section
a. b. c. d. 2 e. 4