Typically, no more than a couple dozen potentially hazardous asteroids approach the Earth as close as 0.05 AU each decade
Indicate whether the statement is true or false
FALSE
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What can we infer, at least roughly, from a star's luminosity class?
A) its age in years B) its surface temperature C) its size (radius) D) its mass
A guitar string is fixed at both ends. If you tighten it to increase its tension
A) the frequencies of its vibrational modes will increase but its wavelengths will not be affected. B) the wavelength increases but the frequency is not affected. C) both the frequency and the wavelength increase.
Considering only the effect of diffraction, what is the smallest structure resolvable using a 12keV electron microscope?
a. 
b. 
c. 
d. 
During an adiabatic process, an ideal gas does 25 J of work. What is the change in the internal (thermal) energy of the gas during this process?
A) 0.00 J B) 50 J C) 25 J D) -25 J E) -50 J