Please help!! What materials are in an electronic buzzer, a memory storage in computer hard drive, inner walls of industrial furnaces, light sensors, automobile engine parts, and the parts that light of in a display screen.

Technician a says after tire service work tires and wheels must be in a state of static and dynamic balance in order to avoid vibration in service. technician b says tires and wheels are balanced at the factory and do not need further balancing. who is correct?

Sorry two big valves your rpm will go down plus the smaller ones will give you more horsepower your rpm will go up the answer is b

Who pays into social security a employees b self employed c employers d all of the above