1. The wind howled like a wild goblin.

What figure of speech is this?

The figure of speech used in this sentence is a simile.

2. The eagle on the seal of the United States is strength itself.

The figure of speech used in this sentence is personification.

The boats bobbed back and forth like rocking horses.

What is the author trying to communicate with this figure of speech?

With this figure of speech, the author is trying to emphasize the gentle and rhythmic movement of the boats. By comparing their movement to rocking horses, the author conveys a sense of tranquility and possibly playfulness.