List the most important error sources in the experiment of ohms law​

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

Arowboat passenger uses an oar to push the boat off the dock by exerting a force of 40n for 3.0s. what impulse acts on the boat.

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat