Which of the following is not a unit of power?
a. ft • lb/s
b. kW • h
c. J/s
d. watt
b
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The material that accretes onto a neutron star or black hole is expected to emit X-rays because
a. the material will produce synchrotron radiation. b. hydrogen nuclei begin to fuse and emit high energy photons. c. the material will become hot enough that it will radiate most strongly a X-ray wavelengths. d. as the material slows down it converts thermal energy to gravitational potential energy. e. none of the above
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5 sin (?t + ?/3). The phase (in rad) of the motion at t = 2 s is
A. 7?/3. B. ?/3. C. ?. D. 5?/3. E. 2?.
An eyeglass lens is cut with one surface having a radius R1 and the other surface having a radius R2, with R1 < R2 . Both positive radii are measured from the same side with R1 being the side closer to the eye. Is this convex-concave lens a converging lens or a diverging lens?
a. This is a converging lens. b. This is a diverging lens. c. This can be either a converging or diverging lens, as more information is needed for a final determination. d. This is neither, since a lens cannot be made this way.
Generally, the solubility of gases in liquids increases with
a. decreasing temperature and increasing pressure. b. increasing temperature and decreasing pressure. c. decreasing temperature and decreasing pressure. d. increasing temperature and increasing pressure.