A laser beam 6.80 mm in diameter is incident on a plane surface at an angle of 62.0°, as shown in Fig. 21.68. What is the elliptical area that the laser covers on the surface? (See Exercise 55.)

Data from Exercises 55

The ends of a horizontal tank 20.0 ft long are ellipses, which can be described by the equation 9x² + 20y² = 180, where x and y are measured in feet. The area of an ellipse is A = πab. Find the volume of the tank.

Transcribed Image Text:

Fig. 21.68 62.0⁰ 6.80 mm