An underwater scuba diver sees the Sun at an apparent angle of 39.6° from the vertical. How far is the Sun above the horizon? (nwater = 1.333)
a. 58.2°
b. 61.4°
c. 31.8°
d. 28.6°
e. 39.6°
c
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Einstein's famous equation E = mc2 is a statement of the equivalence of energy and the square of the speed of light
a. True b. False Indicate whether the statement is true or false
In a neutron star, the core is:
A) made of compressed neutrons in contact with each other. B) electrons and protons packed so tightly they are in contact. C) constantly expanding and contracting. D) primarily iron and silicon. E) no longer rotating.
Two loudspeakers are placed facing each other and driven by the same source at 680 Hz. A listener is positioned between the two speakers on the line separating them, thus creating a constructive interference at the listener's ear. What minimum distance would one of the speakers be moved back away from the listener to produce destructive interference at the listener's ear? (The speed of sound =
340 m/s.) a. 0.13 m c. 0.50 m b. 0.25 m d. 1.00 m
The brightest stars of a young open cluster will be:
A) Cepheid variables. B) massive blue main sequence stars. C) red giants. D) yellow main sequence stars like the Sun. E) T Tauri variables.