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A boat travels 6.0 m while it increases from an initial velocity of 5.5 m/s to a final
velocity of 9.5 m/s. What is the magnitude of the boat's acceleration while it travels
the 6.0 m?

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

Describe uniform velocity and variable velocity in short