Questions & Answers about Метроном задаёт ритм.
Because метроном is the thing doing the action: it sets the rhythm.
In Russian, the subject is normally in the nominative case, and метроном is nominative singular. It is a masculine noun, which you can often recognize because it ends in a consonant.
So in Метроном задаёт ритм, the structure is:
- метроном = the metronome = subject
- задаёт = sets
- ритм = rhythm = direct object
It is in the accusative, but for many masculine inanimate nouns, the accusative singular looks exactly the same as the nominative singular.
So:
- nominative: ритм
- accusative: ритм
That is normal for masculine inanimate nouns.
Compare:
- Я вижу метроном. = I see a metronome.
- Я слышу ритм. = I hear the rhythm.
Both метроном and ритм are masculine inanimate nouns, so their accusative singular form stays the same.