Q1. What is the smallest thickness of a soap film (n=1.47) that will appear black if illuminated with 490 nm light? Suppose there is air on both sides of the soap film.
Q2. A person exerts a horizontal force of F = 170 N in the test apparatus shown in the drawing. (h = 0.33 m.) Find out the horizontal force M that his flexor muscle exerts on his forearm.
Q3. A woman rides on a Ferris wheel of radius 17 rm m that maintains the same speed throughout its motion. To better know physics, she takes along a digital bathroom scale (with memory) and sits on it. When she gets off the ride, she uploads the scale readings to a computer and creates a graph of scale reading versus time. Note that graph has a minimum value of 519 rm N and a maximum value of 666 rm N.