All elliptical galaxies are more massive than the largest spiral galaxies
a. True
b. False
Indicate whether the statement is true or false
False
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A particle starts from rest at xi = 0 and moves for 10 s with an acceleration of +2.0 cm/s2. For the next 20 s, the acceleration of the particle is ?1.0 cm/s2. What is the position of the particle at the end of this motion?
A. zero B. +3.0 m C. ?1.0 m D. +2.0 m E. ?3.0 m
Potassium Iodide (chemical formula: KI) has a face-centered cubic structure (just like sodium chloride). If the distance between crystal planes is d = 0.353 nm and X-rays of wavelength ? = 0.0934 nm are used, what is the smallest angle ? at which a diffraction maximum may be obtained?
A. 9.92° B. 7.60° C. 13.3° D. 15.5° E. 6.52°
Show that the fin effectiveness is related to the fin efficiency by the equation
The ideal gas model assumes that molecules have infinitesimal size. Consider one molecule bouncing around in the container. As the molecule’s size increases relative to the size of the container, how will the average pressure P that it exerts change, other things being held constant?
A. P increases. B. P does not change. C. P decreases. D. One does not have enough information to say.