Earth circles the Sun in _____
A) 365.26 days
B) 363.25 days
C) 366.75 days
D) 364.26 days
A
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Hydrogen lines are weak in the spectra of hot O-type stars because ____
a. most of the hydrogen has been converted to helium b. a good spectrum of these stars is difficult to obtain c. these stars have no atmosphere d. gravitational pressure pushes all the hydrogen lines out of the visible spectrum e. most of the hydrogen is ionized to high energy levels
The force of kinetic friction between two surfaces is dependent on the relative speed of the two surfaces
Indicate whether the statement is true or false
In grinding a steel knife blade (specific heat = 0.11 cal/g-C°), the metal can get as hot as 400.°C. If the blade has a mass of 80
g, what is the minimum amount of water needed at 20°C if the water is not to rise above the boiling point when the hot blade is quenched in it?
The process whereby heat flows by the mass movement of molecules from one place to another is referred to as
A) conduction. B) convection. C) radiation. D) inversion. E) evaporation.