The voltage across a 5-μF capacitor is known to be vc = 125t e^(−1000t) V for t ≥ 0.
(a) Find the current through the capacitor for t > 0. Assume the passive sign convention.
(b) Find the power at the terminals of the capacitor when t = 15 μs.
(c) Is the capacitor absorbing or delivering power at t = 15 μs?
(d) Find the energy stored in the capacitor at t = 15μs.

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.