. A small solid ball is released from rest while fully submerged in a liquid and then its kinetic energy is measured when it has moved 4.0
cm in the liquid. Figure 14-40 gives the results after many liquids are
used: The kinetic energy K is plotted versus the liquid density ρliq, and
Ks = 1.60 J sets the scale on the vertical axis. What are (a) the density
and (b) the volume of the ball?

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?