Question $2\mathrm{.}3--$ Boolean indicator

Create a boolean array called rod$\_$stopped indicating times where the energy of the rod is less than

joules.

tau$=1$e$-4$

rod$\_$stopped $=...$

# Run this cell to see a plot of the total energy

plt$.$figure$($figsize$=(8,2))$

plt$.$plot$($time$[$~rod$\_$stopped$],$E$[$~rod$\_$stopped$],\text{'}$g$-\text{'},$label$=\text{'}$E $($not stopped$)\text{'})$

plt$.$plot$($time$[$rod$\_$stopped$],$E$[$rod$\_$stopped$],\text{'}$r$-\text{'},$label$=\text{'}$E $($stopped$)\text{'})$

plt$.$xlabel$(\text{'}$t$\text{'})$

plt$.$legend$()$

plt$.$grid$()$

grader.check$("$q$2$p$3")$

Question $2\mathrm{.}4--$ Settling time

Define the settline time Ts $($in seconds$)$ as the earliest value of time when the rod$\_$stopped condition is True.

Hint np$.$where, np$.$min