Answer:

Explanation:
The velocity of an object relative to a system
, the velocity of that system
and the velocity measured by an observer at rest
are related by the following equation:

In this case, the object is the boat, the system is the water and we are finding the velocity measured by an observer at rest. So, the formula becomes:

In words, the velocity of the boat relative to an observer standing on either bank, is 18.0km/h.
Current I is the rate at which charge moves through an area A, such as the cross-section of a wire
Answer:
b.
Explanation:
Parallax is the effect whereby the position or the direction of an object appears to differ, when viewed from different positions. e.g. through the view finder and lens of the camera.
a valid way of demonstrating parallax for yourself is by b.Hold up your hand in front of your face, and alternately close your left and right eyes.
Answer:
The receptors that sense the Earth's magnetic field are probably located in the birds' eyes. Now, researchers at Lund University have studied different proteins in the eyes of zebra finches and discovered that one of them differs from the others: only the Cry4 protein maintains a constant level throughout the day and in different lighting conditions
Explanation: