ch33-p098 - 98. (a) The Sun is far enough away that we...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
98. (a) The Sun is far enough away that we approximate its rays as “parallel” in this Figure. That is, if the sunray makes angle θ from horizontal when the bird is in one position, then it makes the same angle when the bird is any other position. Therefore, its shadow on the ground moves as the bird moves: at 15 m/s. (b) If the bird is in a position, a distance x > 0 from the wall, such that its shadow is on the wall at a distance 0 y h from the top of the wall, then it is clear from the Figure that tan = y / x . Thus,
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.
Ask a homework question - tutors are online