The Universe is too big to discuss distance without using _______________
Fill in the blank(s) with correct word
scientific notation
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Temperature Scales: The temperature in your classroom is closest to
A. 68 K. B. 68°C. C. 50°C. D. 295 K.
Primordial lead contains the isotope lead-______________, whereas radiogenic lead does not
Fill in the blank(s) with correct word
Which of the following best describes a set of conditions under which archaeoastronomers would conclude that an ancient structure was used for astronomical purposes?
A) The structure has holes in the ceiling that allow viewing the passage of constellations that figure prominently in the culture's folklore, and many other structures built by the same culture have ceiling holes placed in the same way. B) They find that, looking out from the center of the building, there are two windows that align with the rise and set points of two bright stars. C) The structure has 29 straight lines pointing out from a center, just like there are 29 days in the lunar cycle. D) The structure has the same dome shape as modern astronomical observatories.
A wheel rotating about a fixed axis has an angular position given by ? = 3.0 ? 2.0t3, where ? is measured in radians and t in seconds. What is the angular acceleration of the wheel at t = 2.0 s?
a. ?1.0 rad/s2 b. ?24 rad/s2 c. ?2.0 rad/s2 d. ?4.0 rad/s2 e. ?3.5 rad/s2