If this sequence was sampled with asampling frequency fs 20 kHz, what size of DFT isrequiredin order to get a frequency resolution of 5Hz?

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete

i believe the answer would be:

d. violin, clarinet, french horn, and tuba

0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

360seconds i 1 hr

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.