Questions

The Boston Marathon

Personal flotation devices (PFDs), have life span upto it is damaged. Hence, When it has a torn strap you should discard a PFD.

CPU speed is measured with the processors speed which is measured in MIPS (Million Instructions Per Second), Flops (Floating-point operations per second) and CPU clock speed (usually measured in gigahertz). 

The acid used in lead storage cells is Sulphuric acid. They are used car batteries. Lead-acid batteries are capable of being recharged, which is important for their use in cars.

The computers microprocessor speed depends on all the factors like clock speed, bandwidth and the number of instructions it processes.

True, Earth is a system comprised of interacting processes. Such processes include carbon cycle, water cycle, Phosphorous cycle,...

Three Logic Levels are used and they are High, Low, HIgh impedance state. The high and low are normal logic levels & high impedance state is electrical open circuit conditions. Tri-state logic has a third line called enable line.

Gum.