What are the first three harmonics of a string of linear mass density 2.00 g/m and length 0.600 m when it is subjected to tension of 50.0 N?
What will be an ideal response?
132. Hz, 264. Hz, 396. Hz
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The high ____________________ of quasars reveals to astronomers that they must be very distant
Fill in the blank(s) with correct word
A dwarf planet orbiting the Sun outside of Neptune's orbit is called a(n) ________.
A. plutoid B. Oort Cloud Object C. comet D. neptoid E. plutino
Which of the following best explains the hypothesized phenomenon of black hole evaporation?
A) Particles (or anti-particles) are created by a quantum mechanical effect near, but outside, the event horizon of the black hole. The law of conservation of energy maintains that the black hole must lose energy to "pay" for the creation of this mass. B) Particles (or anti-particles) are occasionally ejected from within the event horizon, causing the black hole to lose mass. C) Virtual particles created near the black hole are constantly annihilating each other, causing a high temperature even if the black hole has no accretion disk. This high temperature provides escape velocity for the virtual particles, causing the entire "cloud" of virtual particles to expand away into space. D) Black hole evaporation is a virtual process, meaning that it has been theorized by astrophysicists, but doesn't really occur.
Velocity Addition: Two spaceships, each 100 m long in its own rest frame, approach Earth from opposite directions, each with a speed 0.50c relative to Earth. As measured by a passenger in one of the spaceships, how long is the other spaceship?
A. 50 m B. 60 m C. 70 m D. 80 m E. 90 m