Questions & Answers about Diese Stadt wirkt heute ruhig.
Here wirkt means seems / appears / comes across as.
So:
- Diese Stadt wirkt heute ruhig.
≈ This city seems calm today.
It does not mean “works” or “has an effect” here (which are other meanings of wirken in different contexts). In this sentence, wirken expresses a subjective impression: how the city feels to the speaker.
Both are possible, but the nuance changes:
Diese Stadt ist heute ruhig.
→ This city is calm today. (stating a fact)Diese Stadt wirkt heute ruhig.
→ This city seems/appears calm today. (speaker’s impression)
ist = objective description.
wirkt = how something comes across to you; it leaves that impression, but you’re not necessarily claiming it as an objective fact.