9. Interference rings ar obtained on the screen placed in the focal plane of a lens (see Figure b). The focal length is f. The light beam used to build the interference image is due to light beam from the source S which is reflected from a glass plate with thickness d. No direct light from S fall onto the screen. Find the radius r of the first dark interference ring, if the center of the interference image is dark as well. (b) Interference setup

2. Solve the force acting on the 8 KN block if it is in equilibrium. 58⁰ 38⁰ P

6. If an object has a velocity of 27.8 ft/sec what is the velocity in km/hr?

Use 10m/s

8. Solve the following linear equation q(t) with conditions. dą -1- IR = 0 (I =", t= 0, q(0) = 0, qo = Cɛ) C dt'

2. Solve for R (resultant and locate) 0 2 m SKN 2 m 25 kN-m 2 m 8 kN

5. Differentiate derived quantity from fundamental quantity. Give three (3) examples of each.

Please use neat handwriting and show work A light ray traveling in air hits the surface of an unknown liquid ina beaker as shown in the picture. When the angle 0 is 55° the ray hits at a point where x = 2 cm. Calculate the index of refraction of the liquid.

(6)