An organ pipe closed at one end and open at the other end has two successive harmonics with frequencies of 2170 Hz and 2790 Hz. What is the fundamental frequency of the pipe?
What will be an ideal response?
310 Hz
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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
What is the direction of 
in the wave as it passes S?
A. A B. B C. C D. D E. Toward the viewer. F. Away from the viewer. T. The vector is zero. G. AA H. BB I. CC J. DD
Jovian planets are thought to form beyond the frost line of their star systems. How, then, might it be possible for a large moon around a jovian planet to have a habitable surface with liquid water?
A) The moon would need to be locked in synchronous rotation with its planet. B) The jovian planet would need to have migrated inward to the habitable zone of its star. C) The moon would need to have a magnetic field. D) The moon would need to have plate tectonics. E) The moon would need to have a high density.
When you jump, you accelerate upward because the floor exerts an upward force on you
a. True b. False Indicate whether the statement is true or false