In the H-R diagram, 90 percent of all stars are
a. in the giant region.
b. in the supergiant region.
c. among the B stars.
d. among the G stars.
e. on the main sequence.
E
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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
Opposite of the emission-line spectrum, because an atom's set of possible absorption lines have exactly the same wavelengths as its possible emission lines.
A. absorption line spectrum B. emission line spectrum C. continuous spectrum
An ant walks down the surface of a ball. If the ant begins to slip when the normal force is less than one-third of the ant's weight, at what angle, measured from the top of the ball, does the ant begin to slip?
A) 70.5° B) 19.5° C) 55.0° D) 18.4° E) 35.2°
Two blocks, M1 > M2, having the same speed, move from a frictionless surface onto a surface having friction coefficient ?k