The diagram illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see a continuous spectrum?
a. 1
b. 2
c. 3
d. 2 and 3
e. none of them
A
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proportional relationship between a galaxy's distance and that galaxy's receding velocity
A. Gerard de Vaucouleurs |
B. Georges Lemaître |
C. Hubble’s Law |
D. Edwin Hubble |
E. Velocity or Speed |
F. Ho |
A rock is thrown at a window that is located 18.0 m above the ground. The rock is thrown at an angle of 40.0° above horizontal. The rock is thrown from a height of 2.00 m above the ground with a speed of 30
0 m/s and experiences no appreciable air resistance. If the rock strikes the window on its upward trajectory, from what horizontal distance from the window was it released? A) 53.2 m B) 48.7 m C) 71.6 m D) 29.8 m E) 27.3 m
Two stereo speakers mounted 4.52 m apart on a wall emit identical sound waves. You are standing at the opposite wall of the room at a point directly between the two speakers
You walk 2.11 m parallel to the wall, to a location where you first notice that the sound intensity is essentially zero. If the wall along which you are walking is from the wall with the speakers, what is the wavelength of the sound waves? The walls are cushioned to absorb sound reflections. A) 2.05 m B) 2.57 m C) 2.91 m D) 1.71 m
Under electrostatic conditions, the electric field just outside the surface of any charged conductor
A) is always parallel to the surface. B) is always zero because the electric field is zero inside conductors. C) is always perpendicular to the surface of the conductor. D) is perpendicular to the surface of the conductor only if it is a sphere, a cylinder, or a flat sheet. E) can have nonzero components perpendicular to and parallel to the surface of the conductor.