The diagram above shows three models of carbon. Which statement is true about these models? (DOK 2)
A. Carbon-13 and Carbon-14 are isotopes, but Carbon-12 is not an isotope.
B. All three models are isotopes, but the Carbon-12 model is a cation.
C. The Carbon-12 model is an anion, but Carbon-13 and Carbon-14 models are neutral.
D. All three models show neutral atoms that are all isotopes of carbon.

Wo small variable-thrust jets are actuated to keep the spacecraft angular velocity about the z-axis constant at ? 0 = 1.16 rad/s as the two telescoping booms are extended from r1 = 1.18 m to r2 = 4.69 m at a constant rate over a period of 124 seconds. the small 19-kg experiment modules at the ends of the booms may be treated as particles, and the mass of the rigid booms is negligible. determine the necessary thrust t for each jet as a function of time where t = 0 is the time when the telescoping action is begun. after you have the general expression for t, answer the questions. show work.