The lenses of the eyeglasses are being cleaned using a nylon cloth. In doing so, which becomes positively charged? Negatively charged? Assume that the lenses are made of glass.

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?

Dao makes a table to identify the variables used in the equations for centripetal acceleration. what quantities belong in cells x and y?

Decreased sensitivity to an unchanging stimulus is known as