A solar mass star will evolve off the main sequence when:
A) it completely runs out of hydrogen.
B) it expels a planetary nebula to cool off and release radiation.
C) it explodes as a violent nova.
D) it builds up a core of inert helium.
E) it loses all its neutrinos, so fusion must cease.
D
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What is the velocity of propagation if a wave has a frequency of 12. Hz and a wavelength of 3.0 m?
A) 4.0 m/s B) 6.0 m/s C) 0.25 m/s D) 28 m/s E) 36 m/s
A +20-nC point charge is placed on the x axis at x = 2.0 m, and a ?25-nC point charge is placed on the y axis at y = ?3.0 m. What is the direction of the electric field at the origin?
a. 209° b. 61° c. 29° d. 241° e. 151°
A charge Q is positioned at the center of a sphere of radius R. The flux of the electric field through the sphere is equal to ?
If the charge Q is now placed at the center of a cube the flux of the electric field through the surface of the cube is equal to A) ?/2. B) ?. C) 2?. D) 0. E) The value of the flux depends on the dimensions of the cube.
A tuning fork is sounded above an adjustable length resonating tube (one end closed), which resonates at a length of 0.250 m and again at 0.750 m. If the tube length were extended further, at what point will the tuning fork again create a resonance condition?
a. 1.75 m c. 1.25 m b. 1.50 m d. 1.00 m