Questions

When a running car stops suddenly, the passengers tends to lean forward because of Inertia of motion.

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). 

Galton's whistle is also called as Dogs whistle or silent whistle, is a type of whistle that emits sound in the ultrasonic range, which people cannot hear but some other animals can, including dogs and domestic cats, and is used in their training.

Rust forms when oxygen reacts with chemicals in rocks, and that is often the case with many other elements in general. Like a copper nail being exposed to the air will rust.