Describe the major social classes in the United States: uppe…

Describe the major social classes in the United States: upper class, middle class, working class, and lower class. Consider the share of the population in each class, as well as the income levels, typical schooling, and type of work that characterize people at each level.

A piston oscillates with simple harmonic motion according to…

A piston oscillates with simple harmonic motion according to the expression. This oscillation creates a sound wave in air. What’s the amplitude of the oscillation? What’s the frequency of the oscillation? What’s the wavelength of the sound wave? If an observer moves toward the piston at 5 m/s, what frequency do they hear?

The capacitor below is initially uncharged. The switch is…

The capacitor below is initially uncharged. The switch is first thrown to position a. What is the current through the resistor as a function of time while the capacitor is charging? Be sure to show the direction. What’s the power delivered to the resistor as a function of time while the capacitor is charging? When the capacitor is charged to a potential difference of 13 V, the switch is thrown to position b. What’s the current through the resistor as a function of time while the capacitor is discharging? Be sure to show the direction. What’s the power delivered to the resistor while the capacitor is discharging?