By definition, the universe consists of
a. all energy only.
b. all space only.
c. all matter only.
d. all of the above.
d
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The instability of uranium-235 compared to uranium-238, along with the relative stability of hydrogen compared to tritium, shows that the stability of a given nucleus depends upon
A. adding or subtracting neutrons, which can change a stable isotope into an unstable isotope. B. the number of electrons in the nucleus. C. the mass: heavier nuclei are always less stable. D. the speed of electrons orbiting the nucleus: more mass means more gravitational pull.
Which of the following statements is incorrect?
What will be an ideal response?
Brian is working on a project that involves astronomical calculations. The numbers involved in the calculations are very large, and the calculations require him to write too many zeros. Which of the following methods should Brian use to express the numbers without writing a great many zeros?
A) Theoretical notation B) The octal numeral system C) The binary number system D) Scientific notation
Springs: A very light ideal spring of spring constant (force constant) 2.5 N/cm is 15 cm long when nothing is attached to it. It is now used to pull horizontally on a 12.5-kg box on a perfectly smooth horizontal floor. You observe that the box starts from rest and moves 96 cm during the first 1.6 s of its motion with constant acceleration. How long is the spring during this motion?
Fill in the blank(s) with the appropriate word(s).