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Sue, of Sue’s Sandwiches, sells sandwiches and soda from a sidewalk cart in a popular park near her house. She sets up her cart in the summers to earn money for college tuition. Last month she sold $1,240 worth of products (sandwiches and sodas) to 100 customers. She spent $210 on the sandwich ingredients and buying the sodas wholesale. Her unit is one sandwich ($4) plus one soda ($1). Define the unit of sale and calculate the economics of one unit for Sue’s Sandwiches.

A string of length 3 m and total mass 12 g is under a tension of 160 N. A transverse harmonic wave with wavelength 25 cm and amplitude 2 cm travels to the right along the string. It is observed that the displacement at x = 0 at t = 0 is 0:87 cm.
(i) What is the speed of the wave?
(ii) Write the wave function, y(x; t).
(iii) Find the particle velocity at position x = 0 at time t = 10 s. What is the maximum particle velocity?

Monochromatic light illuminates a single slit of width 0.3 mm, creating a diffraction pattern on a screen 2 m away from the slit. The first-order minima on the screen are located ± 3.7 mm on either side of the central intensity peak. What is the wavelength of the light?