Most people refer to JFIF images as ______.
A. JPEGs
B. vector images
C. PNGs
D. WebPs
Answer: A
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The pitch of a sound is determined by
A) the amplitude. B) the speed. C) the frequency. D) the wavelength. E) none of the above
Airplane lift is achieved when air pressure on the bottom of its wings is
A) greater than pressure on top. B) less than pressure on top. C) the same as pressure on top.
By operating a reversible heat engine with an ideal gas as the working substance in a Carnot cycle and measuring the ratio Qc/Qh, we can calculate
a. n, the number of moles of the ideal gas. b. the ratio Vc/Vh of the volumes of the ideal gas. c. the ratio Pc/Ph of the pressures of the ideal gas. d. the ratio PcVc/PhVh of the products of volumes and pressures of the ideal gas. e. the value of Avogadro's number.
Carbon fusion occur in high-mass stars but not in low-mass stars because ________
A) carbon fusion can occur only in the stars known as carbon stars B) the cores of low-mass stars never contain significant amounts of carbon C) only high-mass stars do fusion by the CNO cycle D) the cores of low-mass stars never get hot enough for carbon fusion