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 at X-ray wavelengths.
d. as the material slows down it converts thermal energy to gravitational potential energy.
e. None of the other choices are correct.
c. the material will become hot enough that it will radiate most strongly at X-ray wavelengths.
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Using a resistor and two different value capacitors, which of the following combinations in an RC circuit would give the greatest time constant?
a. the resistor in series with both capacitors in series with each other b. the resistor in series with the lower value capacitor c. the resistor in series with the larger value capacitor d. the resistor in series with both capacitors in parallel with each other
The statement by Newton that "for every action there is an opposite but equal reaction" is regarded as which of his laws of motion?
a. first b. second c. third d. fourth
The Moon does not fall to Earth because
1) the net force on it is zero. 2) it is being pulled by the sun and planets as well as Earth. 3) it is beyond the main pull of Earth's gravity. 4) but it does fall! More specifically, the Moon 5) is subject to both centripetal and centrifugal forces. 6) interacts with all massive bodies, both near and far. 7) is free of air resistance as well as other Earthly influences. 8) continually falls around Earth rather than straight into it.
If the polarizing angle for cubic zirconia (zirconium oxide) is 65.6°, what is the index of refraction of the material?
a. 1.84 b. 2.00 c. 2.20 d. 2.43 e. 1.17