Need help with questions 4,5, and 6.
4) A cell phone battery has an energy density...
4) A cell phone battery has an energy density 550 w-h/L. The volume of the battery is 15 cm. What is the amount of energy stored in this battery (w-h) 2 5) Some batteries are rechargeable, and others are not. Cell phone batteries are rechargeable. Because rechargeable batteries lose their ability to "hold" charge after too many recharges, the manufacturer often indicates how many recharges to expect. What is a typical number of recharges for a cell phone battery? There are several ways to extend the lifetime of your cell phone battery, including: don't let the charge drop to 0%, don't expose your phone to excessive heat and turn off any location apps. Wall Outlets Below is a "picture" of the voltage from a wall outlet. It has the appearance of a sine wave. The voltage alternates up and down as time passes. This alternating voltage is usually referred to as alternating current (AC). One cycle has a period of approximately 16.7 ms and the amplitude is approximately 170 volts. 6) What is the frequency of this wave (Hertz)?